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/*--------------------------------------------------------------------
 * guc.c
 *
 * Support for grand unified configuration scheme, including SET
 * command, configuration file, and command line options.
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 * See src/backend/utils/misc/README for more information.
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 *
 *
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 * Copyright (c) 2000-2005, PostgreSQL Global Development Group
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 * Written by Peter Eisentraut <peter_e@gmx.net>.
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 *
 * IDENTIFICATION
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 *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.254 2005/03/04 20:21:06 tgl Exp $
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 *
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 *--------------------------------------------------------------------
 */
#include "postgres.h"

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#include <ctype.h>
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#include <float.h>
#include <limits.h>
#include <unistd.h>
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#include <sys/stat.h>
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#include "utils/guc.h"
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#include "utils/guc_tables.h"
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#include "catalog/namespace.h"
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#include "catalog/pg_type.h"
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#include "commands/async.h"
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#include "commands/variable.h"
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#include "commands/vacuum.h"
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#include "executor/executor.h"
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#include "fmgr.h"
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#include "funcapi.h"
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#include "libpq/auth.h"
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#include "libpq/pqcomm.h"
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#include "libpq/pqformat.h"
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#include "mb/pg_wchar.h"
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#include "miscadmin.h"
#include "optimizer/cost.h"
#include "optimizer/geqo.h"
#include "optimizer/paths.h"
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#include "optimizer/prep.h"
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#include "parser/parse_expr.h"
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#include "parser/parse_relation.h"
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#include "postmaster/bgwriter.h"
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#include "postmaster/syslogger.h"
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#include "postmaster/postmaster.h"
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#include "storage/bufmgr.h"
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#include "storage/fd.h"
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#include "storage/freespace.h"
#include "storage/lock.h"
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#include "storage/proc.h"
#include "tcop/tcopprot.h"
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#include "utils/array.h"
#include "utils/builtins.h"
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#include "utils/memutils.h"
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#include "utils/pg_locale.h"
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#include "pgstat.h"
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#ifndef PG_KRB_SRVTAB
#define PG_KRB_SRVTAB ""
#endif

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#define CONFIG_FILENAME	"postgresql.conf"
#define HBA_FILENAME	"pg_hba.conf"
#define IDENT_FILENAME	"pg_ident.conf"
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#ifdef EXEC_BACKEND
#define CONFIG_EXEC_PARAMS "global/config_exec_params"
#endif
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/* XXX these should appear in other modules' header files */
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extern bool Log_disconnections;
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extern DLLIMPORT bool check_function_bodies;
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extern int	CommitDelay;
extern int	CommitSiblings;
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extern char *default_tablespace;
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static const char *assign_log_destination(const char *value,
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					   bool doit, GucSource source);
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#ifdef HAVE_SYSLOG
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extern char *Syslog_facility;
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extern char *Syslog_ident;
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static const char *assign_facility(const char *facility,
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				bool doit, GucSource source);
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#endif
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static const char *assign_defaultxactisolevel(const char *newval, bool doit,
						   GucSource source);
static const char *assign_log_min_messages(const char *newval, bool doit,
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						GucSource source);
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static const char *assign_client_min_messages(const char *newval,
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						   bool doit, GucSource source);
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static const char *assign_min_error_statement(const char *newval, bool doit,
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						   GucSource source);
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static const char *assign_msglvl(int *var, const char *newval, bool doit,
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			  GucSource source);
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static const char *assign_log_error_verbosity(const char *newval, bool doit,
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						   GucSource source);
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static const char *assign_log_statement(const char *newval, bool doit,
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					 GucSource source);
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static bool assign_phony_autocommit(bool newval, bool doit, GucSource source);
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static const char *assign_custom_variable_classes(const char *newval, bool doit,
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							   GucSource source);
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static bool assign_stage_log_stats(bool newval, bool doit, GucSource source);
static bool assign_log_stats(bool newval, bool doit, GucSource source);
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static bool assign_transaction_read_only(bool newval, bool doit, GucSource source);
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static const char *assign_canonical_path(const char *newval, bool doit, GucSource source);
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/*
 * GUC option variables that are exported from this module
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 */
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#ifdef USE_ASSERT_CHECKING
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bool		assert_enabled = true;
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#endif
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bool		log_duration = false;
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bool		Debug_print_plan = false;
bool		Debug_print_parse = false;
bool		Debug_print_rewritten = false;
bool		Debug_pretty_print = false;
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bool		Explain_pretty_print = true;
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bool		log_parser_stats = false;
bool		log_planner_stats = false;
bool		log_executor_stats = false;
bool		log_statement_stats = false;		/* this is sort of all
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												 * three above together */
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bool		log_btree_build_stats = false;
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bool		SQL_inheritance = true;
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bool		Australian_timezones = false;

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bool		Password_encryption = true;
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bool		default_with_oids = true;

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int			log_min_error_statement = PANIC;
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int			log_min_messages = NOTICE;
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int			client_min_messages = NOTICE;
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int			log_min_duration_statement = -1;
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char	   *ConfigFileName;
char	   *HbaFileName;
char	   *IdentFileName;
char	   *external_pid_file;
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/*
 * These variables are all dummies that don't do anything, except in some
 * cases provide the value for SHOW to display.  The real state is elsewhere
 * and is kept in sync by assign_hooks.
 */
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static char *client_min_messages_str;
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static char *log_min_messages_str;
static char *log_error_verbosity_str;
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static char *log_statement_str;
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static char *log_min_error_statement_str;
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static char *log_destination_string;
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static bool phony_autocommit;
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static bool session_auth_is_superuser;
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static double phony_random_seed;
static char *client_encoding_string;
static char *datestyle_string;
static char *default_iso_level_string;
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static char *locale_collate;
static char *locale_ctype;
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static char *regex_flavor_string;
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static char *server_encoding_string;
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static char *server_version_string;
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static char *timezone_string;
static char *XactIsoLevel_string;
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static char *data_directory;
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static char *custom_variable_classes;
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static int	max_function_args;
static int	max_index_keys;
static int	max_identifier_length;
static int	block_size;
static bool integer_datetimes;
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/* should be static, but commands/variable.c needs to get at it */
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char	   *session_authorization_string;
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/*
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 * Displayable names for context types (enum GucContext)
 *
 * Note: these strings are deliberately not localized.
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 */
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const char *const GucContext_Names[] =
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{
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	 /* PGC_INTERNAL */ "internal",
	 /* PGC_POSTMASTER */ "postmaster",
	 /* PGC_SIGHUP */ "sighup",
	 /* PGC_BACKEND */ "backend",
	 /* PGC_SUSET */ "superuser",
	 /* PGC_USERSET */ "user"
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};

/*
 * Displayable names for source types (enum GucSource)
 *
 * Note: these strings are deliberately not localized.
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 */
const char *const GucSource_Names[] =
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{
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	 /* PGC_S_DEFAULT */ "default",
	 /* PGC_S_ENV_VAR */ "environment variable",
	 /* PGC_S_FILE */ "configuration file",
	 /* PGC_S_ARGV */ "command line",
	 /* PGC_S_DATABASE */ "database",
	 /* PGC_S_USER */ "user",
	 /* PGC_S_CLIENT */ "client",
	 /* PGC_S_OVERRIDE */ "override",
	 /* PGC_S_INTERACTIVE */ "interactive",
	 /* PGC_S_TEST */ "test",
	 /* PGC_S_SESSION */ "session"
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};

/*
 * Displayable names for the groupings defined in enum config_group
 */
const char *const config_group_names[] =
{
	/* UNGROUPED */
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	gettext_noop("Ungrouped"),
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	/* FILE_LOCATIONS */
	gettext_noop("File Locations"),
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	/* CONN_AUTH */
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	gettext_noop("Connections and Authentication"),
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	/* CONN_AUTH_SETTINGS */
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	gettext_noop("Connections and Authentication / Connection Settings"),
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	/* CONN_AUTH_SECURITY */
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	gettext_noop("Connections and Authentication / Security and Authentication"),
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	/* RESOURCES */
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	gettext_noop("Resource Usage"),
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	/* RESOURCES_MEM */
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	gettext_noop("Resource Usage / Memory"),
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	/* RESOURCES_FSM */
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	gettext_noop("Resource Usage / Free Space Map"),
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	/* RESOURCES_KERNEL */
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	gettext_noop("Resource Usage / Kernel Resources"),
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	/* WAL */
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	gettext_noop("Write-Ahead Log"),
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	/* WAL_SETTINGS */
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	gettext_noop("Write-Ahead Log / Settings"),
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	/* WAL_CHECKPOINTS */
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	gettext_noop("Write-Ahead Log / Checkpoints"),
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	/* QUERY_TUNING */
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	gettext_noop("Query Tuning"),
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	/* QUERY_TUNING_METHOD */
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	gettext_noop("Query Tuning / Planner Method Configuration"),
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	/* QUERY_TUNING_COST */
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	gettext_noop("Query Tuning / Planner Cost Constants"),
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	/* QUERY_TUNING_GEQO */
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	gettext_noop("Query Tuning / Genetic Query Optimizer"),
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	/* QUERY_TUNING_OTHER */
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	gettext_noop("Query Tuning / Other Planner Options"),
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	/* LOGGING */
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	gettext_noop("Reporting and Logging"),
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	/* LOGGING_WHERE */
	gettext_noop("Reporting and Logging / Where to Log"),
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	/* LOGGING_WHEN */
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	gettext_noop("Reporting and Logging / When to Log"),
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	/* LOGGING_WHAT */
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	gettext_noop("Reporting and Logging / What to Log"),
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	/* STATS */
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	gettext_noop("Statistics"),
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	/* STATS_MONITORING */
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	gettext_noop("Statistics / Monitoring"),
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	/* STATS_COLLECTOR */
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	gettext_noop("Statistics / Query and Index Statistics Collector"),
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	/* CLIENT_CONN */
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	gettext_noop("Client Connection Defaults"),
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	/* CLIENT_CONN_STATEMENT */
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	gettext_noop("Client Connection Defaults / Statement Behavior"),
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	/* CLIENT_CONN_LOCALE */
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	gettext_noop("Client Connection Defaults / Locale and Formatting"),
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	/* CLIENT_CONN_OTHER */
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	gettext_noop("Client Connection Defaults / Other Defaults"),
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	/* LOCK_MANAGEMENT */
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	gettext_noop("Lock Management"),
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	/* COMPAT_OPTIONS */
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	gettext_noop("Version and Platform Compatibility"),
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	/* COMPAT_OPTIONS_PREVIOUS */
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	gettext_noop("Version and Platform Compatibility / Previous PostgreSQL Versions"),
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	/* COMPAT_OPTIONS_CLIENT */
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	gettext_noop("Version and Platform Compatibility / Other Platforms and Clients"),
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	/* PRESET_OPTIONS */
	gettext_noop("Preset Options"),
	/* CUSTOM_OPTIONS */
	gettext_noop("Customized Options"),
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	/* DEVELOPER_OPTIONS */
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	gettext_noop("Developer Options"),
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	/* help_config wants this array to be null-terminated */
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	NULL
};

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/*
 * Displayable names for GUC variable types (enum config_type)
 *
 * Note: these strings are deliberately not localized.
 */
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const char *const config_type_names[] =
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{
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	 /* PGC_BOOL */ "bool",
	 /* PGC_INT */ "integer",
	 /* PGC_REAL */ "real",
	 /* PGC_STRING */ "string"
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};

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/*
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 * Contents of GUC tables
 *
 * See src/backend/utils/misc/README for design notes.
 *
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 * TO ADD AN OPTION:
 *
 * 1. Declare a global variable of type bool, int, double, or char*
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 *	  and make use of it.
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 *
 * 2. Decide at what times it's safe to set the option. See guc.h for
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 *	  details.
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 *
 * 3. Decide on a name, a default value, upper and lower bounds (if
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 *	  applicable), etc.
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 *
 * 4. Add a record below.
 *
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 * 5. Add it to src/backend/utils/misc/postgresql.conf.sample, if
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 *	  appropriate
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 *
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 * 6. Add it to src/bin/psql/tab-complete.c, if it's a USERSET option.
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 *
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 * 7. Don't forget to document the option.
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 *
 * 8. If it's a new GUC_LIST option you must edit pg_dumpall.c to ensure
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 *	  it is not single quoted at dump time.
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 */

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/******** option records follow ********/
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static struct config_bool ConfigureNamesBool[] =
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{
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	{
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		{"enable_seqscan", PGC_USERSET, QUERY_TUNING_METHOD,
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			gettext_noop("Enables the planner's use of sequential-scan plans."),
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			NULL
		},
		&enable_seqscan,
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		true, NULL, NULL
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	},
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	{
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		{"enable_indexscan", PGC_USERSET, QUERY_TUNING_METHOD,
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			gettext_noop("Enables the planner's use of index-scan plans."),
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			NULL
		},
		&enable_indexscan,
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		true, NULL, NULL
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	},
	{
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		{"enable_tidscan", PGC_USERSET, QUERY_TUNING_METHOD,
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			gettext_noop("Enables the planner's use of TID scan plans."),
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			NULL
		},
		&enable_tidscan,
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		true, NULL, NULL
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	},
	{
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		{"enable_sort", PGC_USERSET, QUERY_TUNING_METHOD,
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			gettext_noop("Enables the planner's use of explicit sort steps."),
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			NULL
		},
		&enable_sort,
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		true, NULL, NULL
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	},
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	{
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		{"enable_hashagg", PGC_USERSET, QUERY_TUNING_METHOD,
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			gettext_noop("Enables the planner's use of hashed aggregation plans."),
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			NULL
		},
		&enable_hashagg,
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		true, NULL, NULL
	},
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	{
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		{"enable_nestloop", PGC_USERSET, QUERY_TUNING_METHOD,
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			gettext_noop("Enables the planner's use of nested-loop join plans."),
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			NULL
		},
		&enable_nestloop,
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		true, NULL, NULL
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	},
	{
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		{"enable_mergejoin", PGC_USERSET, QUERY_TUNING_METHOD,
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			gettext_noop("Enables the planner's use of merge join plans."),
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			NULL
		},
		&enable_mergejoin,
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		true, NULL, NULL
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	},
	{
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		{"enable_hashjoin", PGC_USERSET, QUERY_TUNING_METHOD,
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			gettext_noop("Enables the planner's use of hash join plans."),
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			NULL
		},
		&enable_hashjoin,
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		true, NULL, NULL
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	},
	{
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		{"geqo", PGC_USERSET, QUERY_TUNING_GEQO,
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			gettext_noop("Enables genetic query optimization."),
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			gettext_noop("This algorithm attempts to do planning without "
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						 "exhaustive searching.")
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		},
		&enable_geqo,
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		true, NULL, NULL
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	},
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	{
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		/* Not for general use --- used by SET SESSION AUTHORIZATION */
		{"is_superuser", PGC_INTERNAL, UNGROUPED,
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			gettext_noop("Shows whether the current user is a superuser."),
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			NULL,
			GUC_REPORT | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
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		&session_auth_is_superuser,
		false, NULL, NULL
	},
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	{
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		{"ssl", PGC_POSTMASTER, CONN_AUTH_SECURITY,
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			gettext_noop("Enables SSL connections."),
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			NULL
		},
		&EnableSSL,
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		false, NULL, NULL
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	},
	{
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		{"fsync", PGC_SIGHUP, WAL_SETTINGS,
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			gettext_noop("Forces synchronization of updates to disk."),
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			gettext_noop("The server will use the fsync() system call in several places to make "
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						 "sure that updates are physically written to disk. This insures "
						 "that a database cluster will recover to a consistent state after "
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						 "an operating system or hardware crash.")
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		},
		&enableFsync,
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		true, NULL, NULL
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	},
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	{
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		{"zero_damaged_pages", PGC_SUSET, DEVELOPER_OPTIONS,
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			gettext_noop("Continues processing past damaged page headers."),
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			gettext_noop("Detection of a damaged page header normally causes PostgreSQL to "
			"report an error, aborting the current transaction. Setting "
						 "zero_damaged_pages to true causes the system to instead report a "
						 "warning, zero out the damaged page, and continue processing. This "
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						 "behavior will destroy data, namely all the rows on the damaged page."),
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			GUC_NOT_IN_SAMPLE
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		},
		&zero_damaged_pages,
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		false, NULL, NULL
	},
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	{
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		{"silent_mode", PGC_POSTMASTER, LOGGING_WHEN,
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			gettext_noop("Runs the server silently."),
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			gettext_noop("If this parameter is set, the server will automatically run in the "
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			 "background and any controlling terminals are dissociated.")
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		},
		&SilentMode,
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		false, NULL, NULL
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	},
	{
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		{"log_connections", PGC_BACKEND, LOGGING_WHAT,
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			gettext_noop("Logs each successful connection."),
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			NULL
		},
		&Log_connections,
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		false, NULL, NULL
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	},
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	{
		{"log_disconnections", PGC_BACKEND, LOGGING_WHAT,
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			gettext_noop("Logs end of a session, including duration."),
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			NULL
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		},
		&Log_disconnections,
		false, NULL, NULL
	},
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#ifdef USE_ASSERT_CHECKING
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	{
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		{"debug_assertions", PGC_USERSET, DEVELOPER_OPTIONS,
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			gettext_noop("Turns on various assertion checks."),
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			gettext_noop("This is a debugging aid."),
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			GUC_NOT_IN_SAMPLE
		},
		&assert_enabled,
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		true, NULL, NULL
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	},
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#endif

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	{
		/* currently undocumented, so don't show in SHOW ALL */
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		{"exit_on_error", PGC_USERSET, UNGROUPED,
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			gettext_noop("no description available"),
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			NULL,
			GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE
		},
		&ExitOnAnyError,
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		false, NULL, NULL
	},
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	{
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		{"log_duration", PGC_SUSET, LOGGING_WHAT,
			gettext_noop("Logs the duration of each completed SQL statement."),
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			NULL
		},
		&log_duration,
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		false, NULL, NULL
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	},
	{
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		{"debug_print_parse", PGC_USERSET, LOGGING_WHAT,
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			gettext_noop("Prints the parse tree to the server log."),
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			NULL
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		},
		&Debug_print_parse,
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		false, NULL, NULL
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	},
	{
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		{"debug_print_rewritten", PGC_USERSET, LOGGING_WHAT,
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			gettext_noop("Prints the parse tree after rewriting to server log."),
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			NULL
		},
		&Debug_print_rewritten,
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		false, NULL, NULL
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	},
	{
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		{"debug_print_plan", PGC_USERSET, LOGGING_WHAT,
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			gettext_noop("Prints the execution plan to server log."),
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			NULL
		},
		&Debug_print_plan,
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		false, NULL, NULL
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	},
	{
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		{"debug_pretty_print", PGC_USERSET, LOGGING_WHAT,
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			gettext_noop("Indents parse and plan tree displays."),
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			NULL
		},
		&Debug_pretty_print,
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		false, NULL, NULL
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	},
	{
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		{"log_parser_stats", PGC_SUSET, STATS_MONITORING,
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			gettext_noop("Writes parser performance statistics to the server log."),
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			NULL
		},
		&log_parser_stats,
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		false, assign_stage_log_stats, NULL
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	},
	{
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		{"log_planner_stats", PGC_SUSET, STATS_MONITORING,
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			gettext_noop("Writes planner performance statistics to the server log."),
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			NULL
		},
		&log_planner_stats,
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		false, assign_stage_log_stats, NULL
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	},
	{
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		{"log_executor_stats", PGC_SUSET, STATS_MONITORING,
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			gettext_noop("Writes executor performance statistics to the server log."),
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			NULL
		},
		&log_executor_stats,
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		false, assign_stage_log_stats, NULL
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	},
	{
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		{"log_statement_stats", PGC_SUSET, STATS_MONITORING,
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			gettext_noop("Writes cumulative performance statistics to the server log."),
584 585 586
			NULL
		},
		&log_statement_stats,
587
		false, assign_log_stats, NULL
588
	},
589
#ifdef BTREE_BUILD_STATS
590
	{
591
		{"log_btree_build_stats", PGC_SUSET, DEVELOPER_OPTIONS,
592
			gettext_noop("no description available"),
593 594 595 596
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&log_btree_build_stats,
597
		false, NULL, NULL
598
	},
599 600
#endif

601
	{
602
		{"explain_pretty_print", PGC_USERSET, CLIENT_CONN_OTHER,
603
			gettext_noop("Uses the indented output format for EXPLAIN VERBOSE."),
604 605 606
			NULL
		},
		&Explain_pretty_print,
607
		true, NULL, NULL
608
	},
609
	{
610
		{"stats_start_collector", PGC_POSTMASTER, STATS_COLLECTOR,
611
			gettext_noop("Starts the server statistics-collection subprocess."),
612 613 614
			NULL
		},
		&pgstat_collect_startcollector,
615
		true, NULL, NULL
616 617
	},
	{
618
		{"stats_reset_on_server_start", PGC_POSTMASTER, STATS_COLLECTOR,
619
			gettext_noop("Zeroes collected statistics on server restart."),
620 621 622
			NULL
		},
		&pgstat_collect_resetonpmstart,
623
		true, NULL, NULL
624 625
	},
	{
626
		{"stats_command_string", PGC_SUSET, STATS_COLLECTOR,
627
			gettext_noop("Collects statistics about executing commands."),
628 629 630 631 632
			gettext_noop("Enables the collection of statistics on the currently "
				"executing command of each session, along with the time "
						 "at which that command began execution.")
		},
		&pgstat_collect_querystring,
633
		false, NULL, NULL
634 635
	},
	{
636
		{"stats_row_level", PGC_SUSET, STATS_COLLECTOR,
637
			gettext_noop("Collects row-level statistics on database activity."),
638 639 640
			NULL
		},
		&pgstat_collect_tuplelevel,
641
		false, NULL, NULL
642 643
	},
	{
644
		{"stats_block_level", PGC_SUSET, STATS_COLLECTOR,
645
			gettext_noop("Collects block-level statistics on database activity."),
646 647 648
			NULL
		},
		&pgstat_collect_blocklevel,
649
		false, NULL, NULL
650
	},
651

652
	{
653
		{"trace_notify", PGC_USERSET, DEVELOPER_OPTIONS,
654
			gettext_noop("Generates debugging output for LISTEN and NOTIFY."),
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			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&Trace_notify,
659
		false, NULL, NULL
660
	},
661 662

#ifdef LOCK_DEBUG
663
	{
664
		{"trace_locks", PGC_SUSET, DEVELOPER_OPTIONS,
665
			gettext_noop("no description available"),
666 667 668 669
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&Trace_locks,
670
		false, NULL, NULL
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	},
	{
673
		{"trace_userlocks", PGC_SUSET, DEVELOPER_OPTIONS,
674
			gettext_noop("no description available"),
675 676 677 678
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&Trace_userlocks,
679
		false, NULL, NULL
680 681
	},
	{
682
		{"trace_lwlocks", PGC_SUSET, DEVELOPER_OPTIONS,
683
			gettext_noop("no description available"),
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			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&Trace_lwlocks,
688
		false, NULL, NULL
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	},
	{
691
		{"debug_deadlocks", PGC_SUSET, DEVELOPER_OPTIONS,
692
			gettext_noop("no description available"),
693 694 695 696
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&Debug_deadlocks,
697
		false, NULL, NULL
698
	},
699 700
#endif

701
	{
702
		{"log_hostname", PGC_SIGHUP, LOGGING_WHAT,
703
			gettext_noop("Logs the host name in the connection logs."),
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			gettext_noop("By default, connection logs only show the IP address "
						 "of the connecting host. If you want them to show the host name you "
						 "can turn this on, but depending on your host name resolution "
707
			"setup it might impose a non-negligible performance penalty.")
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		},
		&log_hostname,
710
		false, NULL, NULL
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	},
	{
713
		{"sql_inheritance", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
714
			gettext_noop("Causes subtables to be included by default in various commands."),
715
			NULL
716 717
		},
		&SQL_inheritance,
718
		true, NULL, NULL
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	},
	{
721
		{"australian_timezones", PGC_USERSET, CLIENT_CONN_LOCALE,
722
			gettext_noop("Interprets ACST, CST, EST, and SAT as Australian time zones."),
723
			gettext_noop("Otherwise they are interpreted as North/South American "
724
						 "time zones and Saturday.")
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		},
		&Australian_timezones,
727
		false, ClearDateCache, NULL
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	},
	{
730
		{"password_encryption", PGC_USERSET, CONN_AUTH_SECURITY,
731
			gettext_noop("Encrypt passwords."),
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			gettext_noop("When a password is specified in CREATE USER or "
			"ALTER USER without writing either ENCRYPTED or UNENCRYPTED, "
734
						 "this parameter determines whether the password is to be encrypted.")
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		},
		&Password_encryption,
737
		true, NULL, NULL
738 739
	},
	{
740
		{"transform_null_equals", PGC_USERSET, COMPAT_OPTIONS_CLIENT,
741
			gettext_noop("Treats \"expr=NULL\" as \"expr IS NULL\"."),
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			gettext_noop("When turned on, expressions of the form expr = NULL "
			"(or NULL = expr) are treated as expr IS NULL, that is, they "
			"return true if expr evaluates to the null value, and false "
			"otherwise. The correct behavior of expr = NULL is to always "
746
						 "return null (unknown).")
747 748
		},
		&Transform_null_equals,
749
		false, NULL, NULL
750
	},
751
	{
752
		{"db_user_namespace", PGC_SIGHUP, CONN_AUTH_SECURITY,
753
			gettext_noop("Enables per-database user names."),
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			NULL
		},
		&Db_user_namespace,
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		false, NULL, NULL
	},
759
	{
760 761
		/* only here for backwards compatibility */
		{"autocommit", PGC_USERSET, CLIENT_CONN_STATEMENT,
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			gettext_noop("This parameter doesn't do anything."),
			gettext_noop("It's just here so that we won't choke on SET AUTOCOMMIT TO ON from 7.3-vintage clients."),
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			GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE
		},
		&phony_autocommit,
767
		true, assign_phony_autocommit, NULL
768
	},
769
	{
770
		{"default_transaction_read_only", PGC_USERSET, CLIENT_CONN_STATEMENT,
771
			gettext_noop("Sets the default read-only status of new transactions."),
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			NULL
		},
		&DefaultXactReadOnly,
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		false, NULL, NULL
	},
	{
778
		{"transaction_read_only", PGC_USERSET, CLIENT_CONN_STATEMENT,
779
			gettext_noop("Sets the current transaction's read-only status."),
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			NULL,
			GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&XactReadOnly,
784
		false, assign_transaction_read_only, NULL
785
	},
786
	{
787
		{"add_missing_from", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
788
			gettext_noop("Automatically adds missing table references to FROM clauses."),
789 790 791
			NULL
		},
		&add_missing_from,
792 793
		true, NULL, NULL
	},
794 795
	{
		{"check_function_bodies", PGC_USERSET, CLIENT_CONN_STATEMENT,
796
			gettext_noop("Check function bodies during CREATE FUNCTION."),
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			NULL
		},
		&check_function_bodies,
		true, NULL, NULL
	},
802 803
	{
		{"default_with_oids", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
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			gettext_noop("By default, newly-created tables should have OIDs."),
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805
			NULL
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		},
		&default_with_oids,
		true, NULL, NULL
	},
810
	{
811
		{"redirect_stderr", PGC_POSTMASTER, LOGGING_WHERE,
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812
			gettext_noop("Start a subprocess to capture stderr output into log files."),
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			NULL
814
		},
815
		&Redirect_stderr,
816 817
		false, NULL, NULL
	},
818 819
	{
		{"log_truncate_on_rotation", PGC_SIGHUP, LOGGING_WHERE,
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			gettext_noop("Truncate existing log files of same name during log rotation."),
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			NULL
		},
		&Log_truncate_on_rotation,
		false, NULL, NULL
	},
826

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#ifdef WAL_DEBUG
	{
		{"wal_debug", PGC_SUSET, DEVELOPER_OPTIONS,
			gettext_noop("Emit WAL-related debugging output."),
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&XLOG_DEBUG,
		false, NULL, NULL
	},
#endif

839
	{
840
		{"integer_datetimes", PGC_INTERNAL, PRESET_OPTIONS,
841 842
			gettext_noop("Datetimes are integer based"),
			NULL,
843
			GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
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		},
		&integer_datetimes,
#ifdef HAVE_INT64_TIMESTAMP
		true, NULL, NULL
#else
		false, NULL, NULL
#endif
	},

853
	/* End-of-list marker */
854
	{
855 856
		{NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL
	}
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};


860
static struct config_int ConfigureNamesInt[] =
861
{
862
	{
863
		{"default_statistics_target", PGC_USERSET, QUERY_TUNING_OTHER,
864
			gettext_noop("Sets the default statistics target."),
865
			gettext_noop("This applies to table columns that have not had a "
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			"column-specific target set via ALTER TABLE SET STATISTICS.")
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		},
		&default_statistics_target,
869 870
		10, 1, 1000, NULL, NULL
	},
871
	{
872
		{"from_collapse_limit", PGC_USERSET, QUERY_TUNING_OTHER,
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			gettext_noop("Sets the FROM-list size beyond which subqueries are not "
						 "collapsed."),
875
			gettext_noop("The planner will merge subqueries into upper "
876
			"queries if the resulting FROM list would have no more than "
877
						 "this many items.")
878 879
		},
		&from_collapse_limit,
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		8, 1, INT_MAX, NULL, NULL
	},
	{
883
		{"join_collapse_limit", PGC_USERSET, QUERY_TUNING_OTHER,
884 885
			gettext_noop("Sets the FROM-list size beyond which JOIN constructs are not "
						 "flattened."),
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			gettext_noop("The planner will flatten explicit inner JOIN "
						 "constructs into lists of FROM items whenever a list of no more "
888
						 "than this many items would result.")
889 890
		},
		&join_collapse_limit,
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		8, 1, INT_MAX, NULL, NULL
	},
	{
894
		{"geqo_threshold", PGC_USERSET, QUERY_TUNING_GEQO,
895
			gettext_noop("Sets the threshold of FROM items beyond which GEQO is used."),
896 897 898
			NULL
		},
		&geqo_threshold,
899
		12, 2, INT_MAX, NULL, NULL
900
	},
901
	{
902 903
		{"geqo_effort", PGC_USERSET, QUERY_TUNING_GEQO,
			gettext_noop("GEQO: effort is used to set the default for other GEQO parameters."),
904 905
			NULL
		},
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		&Geqo_effort,
		DEFAULT_GEQO_EFFORT, MIN_GEQO_EFFORT, MAX_GEQO_EFFORT, NULL, NULL
	},
	{
		{"geqo_pool_size", PGC_USERSET, QUERY_TUNING_GEQO,
			gettext_noop("GEQO: number of individuals in the population."),
			gettext_noop("Zero selects a suitable default value.")
		},
914
		&Geqo_pool_size,
915
		0, 0, INT_MAX, NULL, NULL
916 917
	},
	{
918
		{"geqo_generations", PGC_USERSET, QUERY_TUNING_GEQO,
919
			gettext_noop("GEQO: number of iterations of the algorithm."),
920
			gettext_noop("Zero selects a suitable default value.")
921 922
		},
		&Geqo_generations,
923
		0, 0, INT_MAX, NULL, NULL
924 925 926
	},

	{
927
		{"deadlock_timeout", PGC_SIGHUP, LOCK_MANAGEMENT,
928
			gettext_noop("The time in milliseconds to wait on lock before checking for deadlock."),
929 930 931
			NULL
		},
		&DeadlockTimeout,
932
		1000, 0, INT_MAX, NULL, NULL
933
	},
934 935

	/*
936 937
	 * Note: There is some postprocessing done in PostmasterMain() to make
	 * sure the buffers are at least twice the number of backends, so the
938 939 940
	 * constraints here are partially unused. Similarly, the superuser
	 * reserved number is checked to ensure it is less than the max
	 * backends number.
941
	 */
942
	{
943
		{"max_connections", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
944
			gettext_noop("Sets the maximum number of concurrent connections."),
945 946 947
			NULL
		},
		&MaxBackends,
948
		100, 1, INT_MAX / BLCKSZ, NULL, NULL
949
	},
950

951
	{
952
		{"superuser_reserved_connections", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
953
			gettext_noop("Sets the number of connection slots reserved for superusers."),
954 955 956
			NULL
		},
		&ReservedBackends,
957
		2, 0, INT_MAX / BLCKSZ, NULL, NULL
958 959
	},

960
	{
961
		{"shared_buffers", PGC_POSTMASTER, RESOURCES_MEM,
962
			gettext_noop("Sets the number of shared memory buffers used by the server."),
963 964 965
			NULL
		},
		&NBuffers,
966
		1000, 16, INT_MAX / BLCKSZ, NULL, NULL
967
	},
968

969
	{
970
		{"port", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
971
			gettext_noop("Sets the TCP port the server listens on."),
972 973 974
			NULL
		},
		&PostPortNumber,
975
		DEF_PGPORT, 1, 65535, NULL, NULL
976
	},
977

978
	{
979
		{"unix_socket_permissions", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
980
			gettext_noop("Sets the access permissions of the Unix-domain socket."),
981
			gettext_noop("Unix-domain sockets use the usual Unix file system "
982
						 "permission set. The parameter value is expected to be an numeric mode "
983
						 "specification in the form accepted by the chmod and umask system "
984 985 986 987
						 "calls. (To use the customary octal format the number must start with "
						 "a 0 (zero).)")
		},
		&Unix_socket_permissions,
988
		0777, 0000, 0777, NULL, NULL
989
	},
990

991
	{
992 993 994
		{"work_mem", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("Sets the maximum memory to be used for query workspaces."),
			gettext_noop("This much memory may be used by each internal "
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995
					 "sort operation and hash table before switching to "
996
						 "temporary disk files.")
997
		},
998 999
		&work_mem,
		1024, 8 * BLCKSZ / 1024, INT_MAX / 1024, NULL, NULL
1000
	},
1001

1002
	{
1003 1004 1005
		{"maintenance_work_mem", PGC_USERSET, RESOURCES_MEM,
			gettext_noop("Sets the maximum memory to be used for maintenance operations."),
			gettext_noop("This includes operations such as VACUUM and CREATE INDEX.")
1006
		},
1007 1008
		&maintenance_work_mem,
		16384, 1024, INT_MAX / 1024, NULL, NULL
1009
	},
1010

1011 1012 1013 1014 1015 1016 1017 1018 1019
	{
		{"max_stack_depth", PGC_SUSET, RESOURCES_MEM,
			gettext_noop("Sets the maximum stack depth, in kilobytes."),
			NULL
		},
		&max_stack_depth,
		2048, 100, INT_MAX / 1024, assign_max_stack_depth, NULL
	},

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1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056
	{
		{"vacuum_cost_page_hit", PGC_USERSET, RESOURCES,
			gettext_noop("Vacuum cost for a page found in the buffer cache."),
			NULL
		},
		&VacuumCostPageHit,
		1, 0, 10000, NULL, NULL
	},

	{
		{"vacuum_cost_page_miss", PGC_USERSET, RESOURCES,
			gettext_noop("Vacuum cost for a page not found in the buffer cache."),
			NULL
		},
		&VacuumCostPageMiss,
		10, 0, 10000, NULL, NULL
	},

	{
		{"vacuum_cost_page_dirty", PGC_USERSET, RESOURCES,
			gettext_noop("Vacuum cost for a page dirtied by vacuum."),
			NULL
		},
		&VacuumCostPageDirty,
		20, 0, 10000, NULL, NULL
	},

	{
		{"vacuum_cost_limit", PGC_USERSET, RESOURCES,
			gettext_noop("Vacuum cost amount available before napping."),
			NULL
		},
		&VacuumCostLimit,
		200, 1, 10000, NULL, NULL
	},

	{
1057 1058
		{"vacuum_cost_delay", PGC_USERSET, RESOURCES,
			gettext_noop("Vacuum cost delay in milliseconds."),
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1059 1060
			NULL
		},
1061
		&VacuumCostDelay,
1062
		0, 0, 1000, NULL, NULL
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1063 1064
	},

1065
	{
1066
		{"max_files_per_process", PGC_POSTMASTER, RESOURCES_KERNEL,
1067
			gettext_noop("Sets the maximum number of simultaneously open files for each server process."),
1068 1069 1070
			NULL
		},
		&max_files_per_process,
1071
		1000, 25, INT_MAX, NULL, NULL
1072
	},
1073

1074
#ifdef LOCK_DEBUG
1075
	{
1076
		{"trace_lock_oidmin", PGC_SUSET, DEVELOPER_OPTIONS,
1077
			gettext_noop("no description available"),
1078 1079 1080 1081
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&Trace_lock_oidmin,
1082
		BootstrapObjectIdData, 0, INT_MAX, NULL, NULL
1083 1084
	},
	{
1085
		{"trace_lock_table", PGC_SUSET, DEVELOPER_OPTIONS,
1086
			gettext_noop("no description available"),
1087 1088 1089 1090
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&Trace_lock_table,
1091
		0, 0, INT_MAX, NULL, NULL
1092
	},
1093 1094
#endif

1095
	{
1096
		{"statement_timeout", PGC_USERSET, CLIENT_CONN_STATEMENT,
1097
			gettext_noop("Sets the maximum allowed duration (in milliseconds) of any statement."),
1098
			gettext_noop("A value of 0 turns off the timeout.")
1099 1100
		},
		&StatementTimeout,
1101 1102 1103
		0, 0, INT_MAX, NULL, NULL
	},

1104
	{
1105
		{"max_fsm_relations", PGC_POSTMASTER, RESOURCES_FSM,
1106
			gettext_noop("Sets the maximum number of tables and indexes for which free space is tracked."),
1107 1108 1109
			NULL
		},
		&MaxFSMRelations,
1110
		1000, 100, INT_MAX, NULL, NULL
1111 1112
	},
	{
1113
		{"max_fsm_pages", PGC_POSTMASTER, RESOURCES_FSM,
1114
			gettext_noop("Sets the maximum number of disk pages for which free space is tracked."),
1115 1116 1117
			NULL
		},
		&MaxFSMPages,
1118
		20000, 1000, INT_MAX, NULL, NULL
1119
	},
1120

1121
	{
1122
		{"max_locks_per_transaction", PGC_POSTMASTER, LOCK_MANAGEMENT,
1123
			gettext_noop("Sets the maximum number of locks per transaction."),
1124 1125
			gettext_noop("The shared lock table is sized on the assumption that "
						 "at most max_locks_per_transaction * max_connections distinct "
1126
						 "objects will need to be locked at any one time.")
1127 1128
		},
		&max_locks_per_xact,
1129
		64, 10, INT_MAX, NULL, NULL
1130
	},
1131

1132
	{
1133
		{"authentication_timeout", PGC_SIGHUP, CONN_AUTH_SECURITY,
1134
			gettext_noop("Sets the maximum time in seconds to complete client authentication."),
1135 1136 1137
			NULL
		},
		&AuthenticationTimeout,
1138
		60, 1, 600, NULL, NULL
1139
	},
1140

1141
	{
1142 1143
		/* Not for general use */
		{"pre_auth_delay", PGC_SIGHUP, DEVELOPER_OPTIONS,
1144
			gettext_noop("no description available"),
1145 1146 1147 1148
			NULL,
			GUC_NOT_IN_SAMPLE
		},
		&PreAuthDelay,
1149
		0, 0, 60, NULL, NULL
1150
	},
1151

1152
	{
1153
		{"checkpoint_segments", PGC_SIGHUP, WAL_CHECKPOINTS,
1154
			gettext_noop("Sets the maximum distance in log segments between automatic WAL checkpoints."),
1155 1156 1157
			NULL
		},
		&CheckPointSegments,
1158
		3, 1, INT_MAX, NULL, NULL
1159
	},
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1160

1161
	{
1162
		{"checkpoint_timeout", PGC_SIGHUP, WAL_CHECKPOINTS,
1163
			gettext_noop("Sets the maximum time in seconds between automatic WAL checkpoints."),
1164 1165 1166
			NULL
		},
		&CheckPointTimeout,
1167
		300, 30, 3600, NULL, NULL
1168
	},
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1169

1170
	{
1171
		{"checkpoint_warning", PGC_SIGHUP, WAL_CHECKPOINTS,
1172 1173
			gettext_noop("Logs if filling of checkpoint segments happens more "
						 "frequently than this (in seconds)."),
1174
			gettext_noop("Write a message to the server log if checkpoints "
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						 "caused by the filling of checkpoint segment files happens more "
						 "frequently than this number of seconds. Zero turns off the warning.")
		},
		&CheckPointWarning,
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		30, 0, INT_MAX, NULL, NULL
	},

1182
	{
1183
		{"wal_buffers", PGC_POSTMASTER, WAL_SETTINGS,
1184
			gettext_noop("Sets the number of disk-page buffers in shared memory for WAL."),
1185 1186 1187
			NULL
		},
		&XLOGbuffers,
1188
		8, 4, INT_MAX / BLCKSZ, NULL, NULL
1189
	},
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1190

1191
	{
1192
		{"commit_delay", PGC_USERSET, WAL_CHECKPOINTS,
1193 1194
			gettext_noop("Sets the delay in microseconds between transaction commit and "
						 "flushing WAL to disk."),
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			NULL
		},
		&CommitDelay,
1198
		0, 0, 100000, NULL, NULL
1199
	},
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1200

1201
	{
1202
		{"commit_siblings", PGC_USERSET, WAL_CHECKPOINTS,
1203 1204
			gettext_noop("Sets the minimum concurrent open transactions before performing "
						 "commit_delay."),
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			NULL
		},
		&CommitSiblings,
1208
		5, 1, 1000, NULL, NULL
1209
	},
1210

1211
	{
1212
		{"extra_float_digits", PGC_USERSET, CLIENT_CONN_LOCALE,
1213
			gettext_noop("Sets the number of digits displayed for floating-point values."),
1214
			gettext_noop("This affects real, double precision, and geometric data types. "
1215
						 "The parameter value is added to the standard number of digits "
1216
						 "(FLT_DIG or DBL_DIG as appropriate).")
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		},
		&extra_float_digits,
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		0, -15, 2, NULL, NULL
	},

1222
	{
1223
		{"log_min_duration_statement", PGC_SUSET, LOGGING_WHEN,
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			gettext_noop("Sets the minimum execution time in milliseconds above which statements will "
						 "be logged."),
			gettext_noop("Zero prints all queries. The default is -1 (turning this feature off).")
1227 1228
		},
		&log_min_duration_statement,
1229
		-1, -1, INT_MAX / 1000, NULL, NULL
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	},

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	{
		{"bgwriter_delay", PGC_SIGHUP, RESOURCES,
			gettext_noop("Background writer sleep time between rounds in milliseconds"),
			NULL
		},
		&BgWriterDelay,
1238
		200, 10, 10000, NULL, NULL
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	},

	{
1242 1243
		{"bgwriter_lru_maxpages", PGC_SIGHUP, RESOURCES,
			gettext_noop("Background writer maximum number of all pages to flush per round"),
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1244 1245
			NULL
		},
1246 1247
		&bgwriter_lru_maxpages,
		5, 0, 1000, NULL, NULL
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	},

	{
1251 1252
		{"bgwriter_all_maxpages", PGC_SIGHUP, RESOURCES,
			gettext_noop("Background writer maximum number of LRU pages to flush per round"),
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1253 1254
			NULL
		},
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		&bgwriter_all_maxpages,
		5, 0, 1000, NULL, NULL
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1257 1258
	},

1259 1260
	{
		{"log_rotation_age", PGC_SIGHUP, LOGGING_WHERE,
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			gettext_noop("Automatic log file rotation will occur after N minutes"),
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			NULL
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		},
		&Log_RotationAge,
1265
		24 * 60, 0, INT_MAX / 60, NULL, NULL
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	},

	{
		{"log_rotation_size", PGC_SIGHUP, LOGGING_WHERE,
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1270
			gettext_noop("Automatic log file rotation will occur after N kilobytes"),
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			NULL
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		},
		&Log_RotationSize,
1274
		10 * 1024, 0, INT_MAX / 1024, NULL, NULL
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	},

1277
	{
1278
		{"max_function_args", PGC_INTERNAL, PRESET_OPTIONS,
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1279
			gettext_noop("Shows the maximum number of function arguments."),
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			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&max_function_args,
		FUNC_MAX_ARGS, FUNC_MAX_ARGS, FUNC_MAX_ARGS, NULL, NULL
	},

	{
1288
		{"max_index_keys", PGC_INTERNAL, PRESET_OPTIONS,
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1289
			gettext_noop("Shows the maximum number of index keys."),
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			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&max_index_keys,
		INDEX_MAX_KEYS, INDEX_MAX_KEYS, INDEX_MAX_KEYS, NULL, NULL
	},

	{
1298
		{"max_identifier_length", PGC_INTERNAL, PRESET_OPTIONS,
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			gettext_noop("Shows the maximum identifier length"),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&max_identifier_length,
		NAMEDATALEN - 1, NAMEDATALEN - 1, NAMEDATALEN - 1, NULL, NULL
	},

	{
1308
		{"block_size", PGC_INTERNAL, PRESET_OPTIONS,
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			gettext_noop("Shows size of a disk block"),
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&block_size,
		BLCKSZ, BLCKSZ, BLCKSZ, NULL, NULL
	},

1317
	/* End-of-list marker */
1318
	{
1319
		{NULL, 0, 0, NULL, NULL}, NULL, 0, 0, 0, NULL, NULL
1320
	}
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};


1324
static struct config_real ConfigureNamesReal[] =
1325
{
1326
	{
1327
		{"effective_cache_size", PGC_USERSET, QUERY_TUNING_COST,
1328
			gettext_noop("Sets the planner's assumption about size of the disk cache."),
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			gettext_noop("That is, the portion of the kernel's disk cache that "
						 "will be used for PostgreSQL data files. This is measured in disk "
						 "pages, which are normally 8 kB each.")
		},
		&effective_cache_size,
1334
		DEFAULT_EFFECTIVE_CACHE_SIZE, 1, DBL_MAX, NULL, NULL
1335
	},
1336
	{
1337
		{"random_page_cost", PGC_USERSET, QUERY_TUNING_COST,
1338 1339
			gettext_noop("Sets the planner's estimate of the cost of a nonsequentially "
						 "fetched disk page."),
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			gettext_noop("This is measured as a multiple of the cost of a "
						 "sequential page fetch. A higher value makes it more likely a "
						 "sequential scan will be used, a lower value makes it more likely an "
						 "index scan will be used.")
		},
		&random_page_cost,
1346
		DEFAULT_RANDOM_PAGE_COST, 0, DBL_MAX, NULL, NULL
1347 1348
	},
	{
1349
		{"cpu_tuple_cost", PGC_USERSET, QUERY_TUNING_COST,
1350
			gettext_noop("Sets the planner's estimate of the cost of processing each tuple (row)."),
1351 1352 1353 1354
			gettext_noop("This is measured as a fraction of the cost of a "
						 "sequential page fetch.")
		},
		&cpu_tuple_cost,
1355
		DEFAULT_CPU_TUPLE_COST, 0, DBL_MAX, NULL, NULL
1356 1357
	},
	{
1358
		{"cpu_index_tuple_cost", PGC_USERSET, QUERY_TUNING_COST,
1359 1360
			gettext_noop("Sets the planner's estimate of processing cost for each "
						 "index tuple (row) during index scan."),
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			gettext_noop("This is measured as a fraction of the cost of a "
						 "sequential page fetch.")
		},
		&cpu_index_tuple_cost,
1365
		DEFAULT_CPU_INDEX_TUPLE_COST, 0, DBL_MAX, NULL, NULL
1366 1367
	},
	{
1368
		{"cpu_operator_cost", PGC_USERSET, QUERY_TUNING_COST,
1369
			gettext_noop("Sets the planner's estimate of processing cost of each operator in WHERE."),
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			gettext_noop("This is measured as a fraction of the cost of a sequential "
						 "page fetch.")
		},
		&cpu_operator_cost,
1374
		DEFAULT_CPU_OPERATOR_COST, 0, DBL_MAX, NULL, NULL
1375 1376 1377
	},

	{
1378
		{"geqo_selection_bias", PGC_USERSET, QUERY_TUNING_GEQO,
1379
			gettext_noop("GEQO: selective pressure within the population."),
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			NULL
		},
		&Geqo_selection_bias,
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		DEFAULT_GEQO_SELECTION_BIAS, MIN_GEQO_SELECTION_BIAS,
		MAX_GEQO_SELECTION_BIAS, NULL, NULL
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	},

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	{
		{"bgwriter_lru_percent", PGC_SIGHUP, RESOURCES,
			gettext_noop("Background writer percentage of LRU buffers to flush per round"),
			NULL
		},
		&bgwriter_lru_percent,
		1.0, 0.0, 100.0, NULL, NULL
	},

	{
		{"bgwriter_all_percent", PGC_SIGHUP, RESOURCES,
			gettext_noop("Background writer percentage of all buffers to flush per round"),
			NULL
		},
		&bgwriter_all_percent,
		0.333, 0.0, 100.0, NULL, NULL
	},

1405
	{
1406
		{"seed", PGC_USERSET, UNGROUPED,
1407
			gettext_noop("Sets the seed for random-number generation."),
1408 1409 1410
			NULL,
			GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
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		&phony_random_seed,
		0.5, 0.0, 1.0, assign_random_seed, show_random_seed
	},

1415
	/* End-of-list marker */
1416
	{
1417
		{NULL, 0, 0, NULL, NULL}, NULL, 0.0, 0.0, 0.0, NULL, NULL
1418
	}
1419 1420 1421
};


1422
static struct config_string ConfigureNamesString[] =
1423
{
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	{
		{"archive_command", PGC_SIGHUP, WAL_SETTINGS,
			gettext_noop("WAL archiving command."),
			gettext_noop("The shell command that will be called to archive a WAL file.")
		},
		&XLogArchiveCommand,
		"", NULL, NULL
	},
1432

1433
	{
1434
		{"client_encoding", PGC_USERSET, CLIENT_CONN_LOCALE,
1435
			gettext_noop("Sets the client's character set encoding."),
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			NULL,
			GUC_REPORT
		},
1439
		&client_encoding_string,
1440
		"SQL_ASCII", assign_client_encoding, NULL
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	},

1443
	{
1444
		{"client_min_messages", PGC_USERSET, LOGGING_WHEN,
1445
			gettext_noop("Sets the message levels that are sent to the client."),
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			gettext_noop("Valid values are DEBUG5, DEBUG4, DEBUG3, DEBUG2, "
						 "DEBUG1, LOG, NOTICE, WARNING, and ERROR. Each level includes all the "
						 "levels that follow it. The later the level, the fewer messages are "
						 "sent.")
		},
		&client_min_messages_str,
1452
		"notice", assign_client_min_messages, NULL
1453
	},
1454

1455
	{
1456
		{"log_min_messages", PGC_SUSET, LOGGING_WHEN,
1457
			gettext_noop("Sets the message levels that are logged."),
1458 1459
			gettext_noop("Valid values are DEBUG5, DEBUG4, DEBUG3, DEBUG2, DEBUG1, "
						 "INFO, NOTICE, WARNING, ERROR, LOG, FATAL, and PANIC. Each level "
1460
						 "includes all the levels that follow it.")
1461 1462
		},
		&log_min_messages_str,
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		"notice", assign_log_min_messages, NULL
	},

	{
1467
		{"log_error_verbosity", PGC_SUSET, LOGGING_WHEN,
1468
			gettext_noop("Sets the verbosity of logged messages."),
1469
			gettext_noop("Valid values are \"terse\", \"default\", and \"verbose\".")
1470 1471
		},
		&log_error_verbosity_str,
1472 1473
		"default", assign_log_error_verbosity, NULL
	},
1474
	{
1475
		{"log_statement", PGC_SUSET, LOGGING_WHAT,
1476
			gettext_noop("Sets the type of statements logged."),
1477
			gettext_noop("Valid values are \"none\", \"ddl\", \"mod\", and \"all\".")
1478 1479 1480 1481
		},
		&log_statement_str,
		"none", assign_log_statement, NULL
	},
1482

1483
	{
1484
		{"log_min_error_statement", PGC_SUSET, LOGGING_WHEN,
1485
			gettext_noop("Causes all statements generating error at or above this level to be logged."),
1486
			gettext_noop("All SQL statements that cause an error of the "
1487
						 "specified level or a higher level are logged.")
1488 1489
		},
		&log_min_error_statement_str,
1490
		"panic", assign_min_error_statement, NULL
1491 1492
	},

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1493 1494
	{
		{"log_line_prefix", PGC_SIGHUP, LOGGING_WHAT,
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1495 1496
			gettext_noop("Controls information prefixed to each log line"),
			gettext_noop("if blank no prefix is used")
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1497 1498 1499 1500 1501 1502
		},
		&Log_line_prefix,
		"", NULL, NULL
	},


1503
	{
1504
		{"DateStyle", PGC_USERSET, CLIENT_CONN_LOCALE,
1505
			gettext_noop("Sets the display format for date and time values."),
1506
			gettext_noop("Also controls interpretation of ambiguous "
1507
						 "date inputs."),
1508 1509
			GUC_LIST_INPUT | GUC_REPORT
		},
1510
		&datestyle_string,
1511
		"ISO, MDY", assign_datestyle, NULL
1512
	},
1513

1514 1515 1516 1517 1518 1519 1520 1521 1522
	{
		{"default_tablespace", PGC_USERSET, CLIENT_CONN_STATEMENT,
			gettext_noop("Sets the default tablespace to create tables and indexes in."),
			gettext_noop("An empty string selects the database's default tablespace.")
		},
		&default_tablespace,
		"", assign_default_tablespace, NULL
	},

1523
	{
1524
		{"default_transaction_isolation", PGC_USERSET, CLIENT_CONN_STATEMENT,
1525
			gettext_noop("Sets the transaction isolation level of each new transaction."),
1526
			gettext_noop("Each SQL transaction has an isolation level, which "
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1527
						 "can be either \"read uncommitted\", \"read committed\", \"repeatable read\", or \"serializable\".")
1528 1529
		},
		&default_iso_level_string,
1530
		"read committed", assign_defaultxactisolevel, NULL
1531 1532
	},

1533
	{
1534
		{"dynamic_library_path", PGC_SUSET, CLIENT_CONN_OTHER,
1535
			gettext_noop("Sets the path for dynamically loadable modules."),
1536
			gettext_noop("If a dynamically loadable module needs to be opened and "
1537
						 "the specified name does not have a directory component (i.e., the "
1538
						 "name does not contain a slash), the system will search this path for "
1539 1540
						 "the specified file."),
			GUC_SUPERUSER_ONLY
1541 1542
		},
		&Dynamic_library_path,
1543
		"$libdir", NULL, NULL
1544 1545 1546
	},

	{
1547
		{"krb_server_keyfile", PGC_POSTMASTER, CONN_AUTH_SECURITY,
1548
			gettext_noop("Sets the location of the Kerberos server key file."),
1549 1550
			NULL,
			GUC_SUPERUSER_ONLY
1551 1552
		},
		&pg_krb_server_keyfile,
1553
		PG_KRB_SRVTAB, NULL, NULL
1554
	},
1555

1556 1557
	{
		{"rendezvous_name", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
1558
			gettext_noop("Sets the Rendezvous broadcast service name."),
1559 1560 1561 1562 1563 1564
			NULL
		},
		&rendezvous_name,
		"", NULL, NULL
	},

1565 1566
	/* See main.c about why defaults for LC_foo are not all alike */

1567
	{
1568
		{"lc_collate", PGC_INTERNAL, CLIENT_CONN_LOCALE,
1569
			gettext_noop("Shows the collation order locale."),
1570 1571 1572 1573
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&locale_collate,
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		"C", NULL, NULL
	},

	{
1578
		{"lc_ctype", PGC_INTERNAL, CLIENT_CONN_LOCALE,
1579
			gettext_noop("Shows the character classification and case conversion locale."),
1580 1581 1582 1583
			NULL,
			GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
		&locale_ctype,
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		"C", NULL, NULL
	},

1587
	{
1588
		{"lc_messages", PGC_SUSET, CLIENT_CONN_LOCALE,
1589
			gettext_noop("Sets the language in which messages are displayed."),
1590 1591 1592
			NULL
		},
		&locale_messages,
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		"", locale_messages_assign, NULL
	},

	{
1597
		{"lc_monetary", PGC_USERSET, CLIENT_CONN_LOCALE,
1598
			gettext_noop("Sets the locale for formatting monetary amounts."),
1599 1600 1601
			NULL
		},
		&locale_monetary,
1602
		"C", locale_monetary_assign, NULL
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	},

	{
1606
		{"lc_numeric", PGC_USERSET, CLIENT_CONN_LOCALE,
1607
			gettext_noop("Sets the locale for formatting numbers."),
1608 1609 1610
			NULL
		},
		&locale_numeric,
1611
		"C", locale_numeric_assign, NULL
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	},

	{
1615
		{"lc_time", PGC_USERSET, CLIENT_CONN_LOCALE,
1616
			gettext_noop("Sets the locale for formatting date and time values."),
1617 1618 1619
			NULL
		},
		&locale_time,
1620
		"C", locale_time_assign, NULL
1621 1622
	},

1623
	{
1624
		{"preload_libraries", PGC_POSTMASTER, RESOURCES_KERNEL,
1625
			gettext_noop("Lists shared libraries to preload into server."),
1626
			NULL,
1627
			GUC_LIST_INPUT | GUC_LIST_QUOTE | GUC_SUPERUSER_ONLY
1628
		},
1629
		&preload_libraries_string,
1630
		"", NULL, NULL
1631 1632
	},

1633
	{
1634
		{"regex_flavor", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
1635
			gettext_noop("Sets the regular expression \"flavor\"."),
1636
			gettext_noop("This can be set to advanced, extended, or basic.")
1637 1638
		},
		&regex_flavor_string,
1639 1640 1641
		"advanced", assign_regex_flavor, NULL
	},

1642
	{
1643
		{"search_path", PGC_USERSET, CLIENT_CONN_STATEMENT,
1644
			gettext_noop("Sets the schema search order for names that are not schema-qualified."),
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			NULL,
			GUC_LIST_INPUT | GUC_LIST_QUOTE
		},
1648 1649
		&namespace_search_path,
		"$user,public", assign_search_path, NULL
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	},

	{
1653 1654
		/* Can't be set in postgresql.conf */
		{"server_encoding", PGC_INTERNAL, CLIENT_CONN_LOCALE,
1655
			gettext_noop("Sets the server (database) character set encoding."),
1656
			NULL,
1657
			GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
1658
		},
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		&server_encoding_string,
		"SQL_ASCII", NULL, NULL
	},

	{
1664
		/* Can't be set in postgresql.conf */
1665
		{"server_version", PGC_INTERNAL, PRESET_OPTIONS,
1666
			gettext_noop("Shows the server version."),
1667 1668 1669
			NULL,
			GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
1670 1671
		&server_version_string,
		PG_VERSION, NULL, NULL
1672 1673
	},

1674
	{
1675 1676
		/* Not for general use --- used by SET SESSION AUTHORIZATION */
		{"session_authorization", PGC_USERSET, UNGROUPED,
1677
			gettext_noop("Sets the session user name."),
1678
			NULL,
1679
			GUC_REPORT | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
1680
		},
1681 1682
		&session_authorization_string,
		NULL, assign_session_authorization, show_session_authorization
1683 1684
	},

1685
	{
1686
		{"log_destination", PGC_SIGHUP, LOGGING_WHERE,
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1687
			gettext_noop("Sets the destination for server log output."),
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			gettext_noop("Valid values are combinations of \"stderr\", \"syslog\", "
						 "and \"eventlog\", depending on the platform."),
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			GUC_LIST_INPUT
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		},
		&log_destination_string,
		"stderr", assign_log_destination, NULL
	},
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	{
		{"log_directory", PGC_SIGHUP, LOGGING_WHERE,
1697
			gettext_noop("Sets the destination directory for log files."),
1698
			gettext_noop("May be specified as relative to the data directory "
1699 1700
						 "or as absolute path."),
			GUC_SUPERUSER_ONLY
1701 1702
		},
		&Log_directory,
1703
		"pg_log", assign_canonical_path, NULL
1704 1705
	},
	{
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		{"log_filename", PGC_SIGHUP, LOGGING_WHERE,
			gettext_noop("Sets the file name pattern for log files."),
1708 1709
			NULL,
			GUC_SUPERUSER_ONLY
1710
		},
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		&Log_filename,
		"postgresql-%Y-%m-%d_%H%M%S.log", NULL, NULL
1713
	},
1714

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1715
#ifdef HAVE_SYSLOG
1716
	{
1717
		{"syslog_facility", PGC_POSTMASTER, LOGGING_WHERE,
1718
			gettext_noop("Sets the syslog \"facility\" to be used when syslog enabled."),
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			gettext_noop("Valid values are LOCAL0, LOCAL1, LOCAL2, LOCAL3, "
						 "LOCAL4, LOCAL5, LOCAL6, LOCAL7.")
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		},
		&Syslog_facility,
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		"LOCAL0", assign_facility, NULL
1724 1725
	},
	{
1726
		{"syslog_ident", PGC_POSTMASTER, LOGGING_WHERE,
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			gettext_noop("Sets the program name used to identify PostgreSQL messages "
						 "in syslog."),
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			NULL
		},
		&Syslog_ident,
1732
		"postgres", NULL, NULL
1733
	},
1734
#endif
1735

1736
	{
1737
		{"TimeZone", PGC_USERSET, CLIENT_CONN_LOCALE,
1738
			gettext_noop("Sets the time zone for displaying and interpreting time stamps."),
1739 1740
			NULL,
			GUC_REPORT
1741 1742
		},
		&timezone_string,
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		"UNKNOWN", assign_timezone, show_timezone
	},

	{
1747
		{"transaction_isolation", PGC_USERSET, CLIENT_CONN_STATEMENT,
1748
			gettext_noop("Sets the current transaction's isolation level."),
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			NULL,
			GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
		},
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		&XactIsoLevel_string,
		NULL, assign_XactIsoLevel, show_XactIsoLevel
	},

	{
1757
		{"unix_socket_group", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
1758
			gettext_noop("Sets the owning group of the Unix-domain socket."),
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			gettext_noop("(The owning user of the socket is always the user "
						 "that starts the server.)")
		},
		&Unix_socket_group,
1763
		"", NULL, NULL
1764
	},
1765

1766
	{
1767
		{"unix_socket_directory", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
1768
			gettext_noop("Sets the directory where the Unix-domain socket will be created."),
1769 1770
			NULL,
			GUC_SUPERUSER_ONLY
1771 1772
		},
		&UnixSocketDir,
1773
		"", assign_canonical_path, NULL
1774
	},
1775

1776
	{
1777
		{"listen_addresses", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
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			gettext_noop("Sets the host name or IP address(es) to listen to."),
			NULL,
			GUC_LIST_INPUT
1781
		},
1782 1783
		&ListenAddresses,
		"localhost", NULL, NULL
1784
	},
1785

1786
	{
1787
		{"wal_sync_method", PGC_SIGHUP, WAL_SETTINGS,
1788
			gettext_noop("Selects the method used for forcing WAL updates out to disk."),
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			NULL
		},
		&XLOG_sync_method,
1792
		XLOG_sync_method_default, assign_xlog_sync_method, NULL
1793
	},
1794

1795 1796
	{
		{"custom_variable_classes", PGC_POSTMASTER, RESOURCES_KERNEL,
1797
			gettext_noop("Sets the list of known custom variable classes."),
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			NULL,
			GUC_LIST_INPUT | GUC_LIST_QUOTE
		},
		&custom_variable_classes,
		NULL, assign_custom_variable_classes, NULL
	},

1805
	{
1806
		{"data_directory", PGC_POSTMASTER, FILE_LOCATIONS,
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		 gettext_noop("Sets the server's data directory."),
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		 NULL,
		 GUC_SUPERUSER_ONLY
1810
		},
1811 1812
		&data_directory,
		NULL, NULL, NULL
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	},

	{
1816
		{"config_file", PGC_POSTMASTER, FILE_LOCATIONS,
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		 gettext_noop("Sets the server's main configuration file."),
1818
		 NULL,
1819
		 GUC_DISALLOW_IN_FILE | GUC_SUPERUSER_ONLY
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		},
		&ConfigFileName,
		NULL, NULL, NULL
	},

	{
		{"hba_file", PGC_POSTMASTER, FILE_LOCATIONS,
		 gettext_noop("Sets the server's \"hba\" configuration file"),
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		 NULL,
		 GUC_SUPERUSER_ONLY
1830
		},
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		&HbaFileName,
		NULL, NULL, NULL
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	},

	{
1836 1837
		{"ident_file", PGC_POSTMASTER, FILE_LOCATIONS,
		 gettext_noop("Sets the server's \"ident\" configuration file"),
1838 1839
		 NULL,
		 GUC_SUPERUSER_ONLY
1840
		},
1841 1842
		&IdentFileName,
		NULL, NULL, NULL
1843 1844 1845
	},

	{
1846
		{"external_pid_file", PGC_POSTMASTER, FILE_LOCATIONS,
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1847
		 gettext_noop("Writes the postmaster PID to the specified file."),
1848 1849
		 NULL,
		 GUC_SUPERUSER_ONLY
1850
		},
1851
		&external_pid_file,
1852
		NULL, assign_canonical_path, NULL
1853 1854
	},

1855
	/* End-of-list marker */
1856
	{
1857
		{NULL, 0, 0, NULL, NULL}, NULL, NULL, NULL, NULL
1858
	}
1859 1860 1861
};


1862
/******** end of options list ********/
1863

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1865 1866 1867 1868 1869 1870
/*
 * To allow continued support of obsolete names for GUC variables, we apply
 * the following mappings to any unrecognized name.  Note that an old name
 * should be mapped to a new one only if the new variable has very similar
 * semantics to the old.
 */
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static const char *const map_old_guc_names[] = {
1872 1873 1874 1875 1876 1877
	"sort_mem", "work_mem",
	"vacuum_mem", "maintenance_work_mem",
	NULL
};


1878
/*
1879
 * Actual lookup of variables is done through this single, sorted array.
1880
 */
1881 1882
static struct config_generic **guc_variables;

1883
/* Current number of variables contained in the vector */
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1884
static int	num_guc_variables;
1885

1886
/* Vector capacity */
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static int	size_guc_variables;
1888

1889

1890
static bool guc_dirty;			/* TRUE if need to do commit/abort work */
1891

1892 1893
static bool reporting_enabled;	/* TRUE to enable GUC_REPORT */

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static char *guc_string_workspace;		/* for avoiding memory leaks */
1895

1896

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static int	guc_var_compare(const void *a, const void *b);
1898
static int	guc_name_compare(const char *namea, const char *nameb);
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static void push_old_value(struct config_generic * gconf);
1900
static void ReportGUCOption(struct config_generic * record);
1901 1902
static void ShowGUCConfigOption(const char *name, DestReceiver *dest);
static void ShowAllGUCConfig(DestReceiver *dest);
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static char *_ShowOption(struct config_generic * record);
1904

1905

1906 1907 1908 1909 1910 1911
/*
 * Some infrastructure for checking malloc/strdup/realloc calls
 */
static void *
guc_malloc(int elevel, size_t size)
{
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	void	   *data;
1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924

	data = malloc(size);
	if (data == NULL)
		ereport(elevel,
				(errcode(ERRCODE_OUT_OF_MEMORY),
				 errmsg("out of memory")));
	return data;
}

static void *
guc_realloc(int elevel, void *old, size_t size)
{
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	void	   *data;
1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937

	data = realloc(old, size);
	if (data == NULL)
		ereport(elevel,
				(errcode(ERRCODE_OUT_OF_MEMORY),
				 errmsg("out of memory")));
	return data;
}

static char *
guc_strdup(int elevel, const char *src)
{
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	char	   *data;
1939 1940 1941 1942 1943 1944 1945 1946 1947 1948

	data = strdup(src);
	if (data == NULL)
		ereport(elevel,
				(errcode(ERRCODE_OUT_OF_MEMORY),
				 errmsg("out of memory")));
	return data;
}


1949 1950 1951 1952 1953 1954
/*
 * Support for assigning to a field of a string GUC item.  Free the prior
 * value if it's not referenced anywhere else in the item (including stacked
 * states).
 */
static void
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1955
set_string_field(struct config_string * conf, char **field, char *newval)
1956
{
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	char	   *oldval = *field;
	GucStack   *stack;
1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983

	/* Do the assignment */
	*field = newval;

	/* Exit if any duplicate references, or if old value was NULL anyway */
	if (oldval == NULL ||
		oldval == *(conf->variable) ||
		oldval == conf->reset_val ||
		oldval == conf->tentative_val)
		return;
	for (stack = conf->gen.stack; stack; stack = stack->prev)
	{
		if (oldval == stack->tentative_val.stringval ||
			oldval == stack->value.stringval)
			return;
	}

	/* Not used anymore, so free it */
	free(oldval);
}

/*
 * Detect whether strval is referenced anywhere in a GUC string item
 */
static bool
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string_field_used(struct config_string * conf, char *strval)
1985
{
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	GucStack   *stack;
1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003

	if (strval == *(conf->variable) ||
		strval == conf->reset_val ||
		strval == conf->tentative_val)
		return true;
	for (stack = conf->gen.stack; stack; stack = stack->prev)
	{
		if (strval == stack->tentative_val.stringval ||
			strval == stack->value.stringval)
			return true;
	}
	return false;
}


struct config_generic **
get_guc_variables(void)
2004 2005 2006
{
	return guc_variables;
}
2007

2008

2009
/*
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2010
 * Build the sorted array.	This is split out so that it could be
2011 2012
 * re-executed after startup (eg, we could allow loadable modules to
 * add vars, and then we'd need to re-sort).
2013
 */
2014
void
2015
build_guc_variables(void)
2016
{
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	int			size_vars;
2018 2019
	int			num_vars = 0;
	struct config_generic **guc_vars;
2020
	int			i;
2021

2022
	for (i = 0; ConfigureNamesBool[i].gen.name; i++)
2023 2024 2025
	{
		struct config_bool *conf = &ConfigureNamesBool[i];

2026 2027 2028
		/* Rather than requiring vartype to be filled in by hand, do this: */
		conf->gen.vartype = PGC_BOOL;
		num_vars++;
2029
	}
2030

2031
	for (i = 0; ConfigureNamesInt[i].gen.name; i++)
2032 2033 2034
	{
		struct config_int *conf = &ConfigureNamesInt[i];

2035 2036
		conf->gen.vartype = PGC_INT;
		num_vars++;
2037
	}
2038

2039
	for (i = 0; ConfigureNamesReal[i].gen.name; i++)
2040 2041 2042
	{
		struct config_real *conf = &ConfigureNamesReal[i];

2043 2044
		conf->gen.vartype = PGC_REAL;
		num_vars++;
2045
	}
2046

2047
	for (i = 0; ConfigureNamesString[i].gen.name; i++)
2048
	{
2049
		struct config_string *conf = &ConfigureNamesString[i];
2050

2051 2052
		conf->gen.vartype = PGC_STRING;
		num_vars++;
2053 2054
	}

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2055 2056
	/*
	 * Create table with 20% slack
2057 2058 2059
	 */
	size_vars = num_vars + num_vars / 4;

2060
	guc_vars = (struct config_generic **)
2061
		guc_malloc(FATAL, size_vars * sizeof(struct config_generic *));
2062

2063
	num_vars = 0;
2064

2065
	for (i = 0; ConfigureNamesBool[i].gen.name; i++)
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		guc_vars[num_vars++] = &ConfigureNamesBool[i].gen;
2067

2068
	for (i = 0; ConfigureNamesInt[i].gen.name; i++)
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2069
		guc_vars[num_vars++] = &ConfigureNamesInt[i].gen;
2070

2071
	for (i = 0; ConfigureNamesReal[i].gen.name; i++)
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2072
		guc_vars[num_vars++] = &ConfigureNamesReal[i].gen;
2073

2074
	for (i = 0; ConfigureNamesString[i].gen.name; i++)
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2075
		guc_vars[num_vars++] = &ConfigureNamesString[i].gen;
2076

2077 2078 2079 2080
	if (guc_variables)
		free(guc_variables);
	guc_variables = guc_vars;
	num_guc_variables = num_vars;
2081
	size_guc_variables = size_vars;
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	qsort((void *) guc_variables, num_guc_variables,
		  sizeof(struct config_generic *), guc_var_compare);
2084 2085
}

2086 2087 2088
static bool
is_custom_class(const char *name, int dotPos)
{
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2089
	/*
2090
	 * assign_custom_variable_classes() has made sure no empty
2091 2092
	 * identifiers or whitespace exists in the variable
	 */
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2093
	bool		result = false;
2094
	const char *ccs = GetConfigOption("custom_variable_classes");
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2095 2096

	if (ccs != NULL)
2097 2098
	{
		const char *start = ccs;
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2099 2100

		for (;; ++ccs)
2101
		{
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			int			c = *ccs;

			if (c == 0 || c == ',')
2105
			{
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2106
				if (dotPos == ccs - start && strncmp(start, name, dotPos) == 0)
2107 2108 2109 2110
				{
					result = true;
					break;
				}
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				if (c == 0)
2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123
					break;
				start = ccs + 1;
			}
		}
	}
	return result;
}

/*
 * Add a new GUC variable to the list of known variables. The
 * list is expanded if needed.
 */
2124
static bool
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2125
add_guc_variable(struct config_generic * var, int elevel)
2126
{
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2127
	if (num_guc_variables + 1 >= size_guc_variables)
2128
	{
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2129 2130
		/*
		 * Increase the vector by 25%
2131
		 */
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2132 2133
		int			size_vars = size_guc_variables + size_guc_variables / 4;
		struct config_generic **guc_vars;
2134

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2135
		if (size_vars == 0)
2136
		{
2137
			size_vars = 100;
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			guc_vars = (struct config_generic **)
				guc_malloc(elevel, size_vars * sizeof(struct config_generic *));
2140 2141
		}
		else
2142
		{
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2143 2144
			guc_vars = (struct config_generic **)
				guc_realloc(elevel, guc_variables, size_vars * sizeof(struct config_generic *));
2145 2146
		}

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2147
		if (guc_vars == NULL)
2148 2149
			return false;		/* out of memory */

2150 2151 2152 2153
		guc_variables = guc_vars;
		size_guc_variables = size_vars;
	}
	guc_variables[num_guc_variables++] = var;
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	qsort((void *) guc_variables, num_guc_variables,
		  sizeof(struct config_generic *), guc_var_compare);
2156
	return true;
2157 2158 2159
}

/*
2160
 * Create and add a placeholder variable. It's presumed to belong
2161 2162
 * to a valid custom variable class at this point.
 */
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static struct config_string *
2164
add_placeholder_variable(const char *name, int elevel)
2165
{
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	size_t		sz = sizeof(struct config_string) + sizeof(char *);
	struct config_string *var;
	struct config_generic *gen;
2169

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	var = (struct config_string *) guc_malloc(elevel, sz);
	if (var == NULL)
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		return NULL;

	gen = &var->gen;
2175 2176
	memset(var, 0, sz);

2177
	gen->name = guc_strdup(elevel, name);
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	if (gen->name == NULL)
2179 2180 2181 2182 2183
	{
		free(var);
		return NULL;
	}

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	gen->context = PGC_USERSET;
	gen->group = CUSTOM_OPTIONS;
2186
	gen->short_desc = "GUC placeholder variable";
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	gen->flags = GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_CUSTOM_PLACEHOLDER;
	gen->vartype = PGC_STRING;
2189

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	/*
	 * The char* is allocated at the end of the struct since we have no
	 * 'static' place to point to.
	 */
	var->variable = (char **) (var + 1);
2195

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	if (!add_guc_variable((struct config_generic *) var, elevel))
2197 2198 2199 2200 2201 2202
	{
		free((void *) gen->name);
		free(var);
		return NULL;
	}

2203 2204
	return var;
}
2205 2206

/*
2207 2208
 * Look up option NAME. If it exists, return a pointer to its record,
 * else return NULL.
2209
 */
2210
static struct config_generic *
2211
find_option(const char *name, int elevel)
2212
{
2213
	const char *dot;
2214 2215
	const char **key = &name;
	struct config_generic **res;
2216
	int			i;
2217

2218
	Assert(name);
2219

2220
	/*
2221
	 * By equating const char ** with struct config_generic *, we are
2222 2223
	 * assuming the name field is first in config_generic.
	 */
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	res = (struct config_generic **) bsearch((void *) &key,
											 (void *) guc_variables,
											 num_guc_variables,
										 sizeof(struct config_generic *),
											 guc_var_compare);
2229 2230
	if (res)
		return *res;
2231 2232

	/*
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	 * See if the name is an obsolete name for a variable.	We assume that
2234 2235 2236 2237 2238 2239
	 * the set of supported old names is short enough that a brute-force
	 * search is the best way.
	 */
	for (i = 0; map_old_guc_names[i] != NULL; i += 2)
	{
		if (guc_name_compare(name, map_old_guc_names[i]) == 0)
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			return find_option(map_old_guc_names[i + 1], elevel);
2241 2242
	}

2243 2244
	/*
	 * Check if the name is qualified, and if so, check if the qualifier
2245 2246 2247
	 * maps to a custom variable class.
	 */
	dot = strchr(name, GUC_QUALIFIER_SEPARATOR);
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2248
	if (dot != NULL && is_custom_class(name, dot - name))
2249
		/* Add a placeholder variable for this name */
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		return (struct config_generic *) add_placeholder_variable(name, elevel);
2251

2252
	/* Unknown name */
2253 2254
	return NULL;
}
2255 2256 2257


/*
2258
 * comparator for qsorting and bsearching guc_variables array
2259
 */
2260 2261
static int
guc_var_compare(const void *a, const void *b)
2262
{
2263 2264
	struct config_generic *confa = *(struct config_generic **) a;
	struct config_generic *confb = *(struct config_generic **) b;
2265

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	return guc_name_compare(confa->name, confb->name);
}


static int
guc_name_compare(const char *namea, const char *nameb)
{
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	/*
	 * The temptation to use strcasecmp() here must be resisted, because
	 * the array ordering has to remain stable across setlocale() calls.
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	 * So, build our own with a simple ASCII-only downcasing.
2277
	 */
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	while (*namea && *nameb)
	{
		char		cha = *namea++;
		char		chb = *nameb++;

		if (cha >= 'A' && cha <= 'Z')
			cha += 'a' - 'A';
		if (chb >= 'A' && chb <= 'Z')
			chb += 'a' - 'A';
		if (cha != chb)
			return cha - chb;
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	}
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	if (*namea)
		return 1;				/* a is longer */
	if (*nameb)
		return -1;				/* b is longer */
	return 0;
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}
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/*
2299
 * Initialize GUC options during program startup.
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 *
 * Note that we cannot read the config file yet, since we have not yet
 * processed command-line switches.
2303
 */
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void
InitializeGUCOptions(void)
2306
{
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	int			i;
	char	   *env;
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	/*
	 * Build sorted array of all GUC variables.
	 */
	build_guc_variables();
2314

2315
	/*
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	 * Load all variables with their compiled-in defaults, and initialize
	 * status fields as needed.
2318
	 */
2319
	for (i = 0; i < num_guc_variables; i++)
2320
	{
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		struct config_generic *gconf = guc_variables[i];
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		gconf->status = 0;
		gconf->reset_source = PGC_S_DEFAULT;
		gconf->tentative_source = PGC_S_DEFAULT;
		gconf->source = PGC_S_DEFAULT;
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		gconf->stack = NULL;
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		switch (gconf->vartype)
		{
			case PGC_BOOL:
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				{
					struct config_bool *conf = (struct config_bool *) gconf;
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					if (conf->assign_hook)
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						if (!(*conf->assign_hook) (conf->reset_val, true,
												   PGC_S_DEFAULT))
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							elog(FATAL, "failed to initialize %s to %d",
								 conf->gen.name, (int) conf->reset_val);
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					*conf->variable = conf->reset_val;
					break;
				}
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			case PGC_INT:
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				{
					struct config_int *conf = (struct config_int *) gconf;
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					Assert(conf->reset_val >= conf->min);
					Assert(conf->reset_val <= conf->max);
					if (conf->assign_hook)
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						if (!(*conf->assign_hook) (conf->reset_val, true,
												   PGC_S_DEFAULT))
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							elog(FATAL, "failed to initialize %s to %d",
								 conf->gen.name, conf->reset_val);
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					*conf->variable = conf->reset_val;
					break;
				}
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			case PGC_REAL:
				{
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					struct config_real *conf = (struct config_real *) gconf;

					Assert(conf->reset_val >= conf->min);
					Assert(conf->reset_val <= conf->max);
					if (conf->assign_hook)
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						if (!(*conf->assign_hook) (conf->reset_val, true,
												   PGC_S_DEFAULT))
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							elog(FATAL, "failed to initialize %s to %g",
								 conf->gen.name, conf->reset_val);
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					*conf->variable = conf->reset_val;
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					break;
				}
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			case PGC_STRING:
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				{
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					struct config_string *conf = (struct config_string *) gconf;
					char	   *str;

					*conf->variable = NULL;
					conf->reset_val = NULL;
					conf->tentative_val = NULL;
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					if (conf->boot_val == NULL)
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					{
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						/* Cannot set value yet */
						break;
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					}
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					str = guc_strdup(FATAL, conf->boot_val);
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					conf->reset_val = str;

					if (conf->assign_hook)
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					{
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						const char *newstr;

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						newstr = (*conf->assign_hook) (str, true,
													   PGC_S_DEFAULT);
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						if (newstr == NULL)
						{
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							elog(FATAL, "failed to initialize %s to \"%s\"",
								 conf->gen.name, str);
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						}
						else if (newstr != str)
						{
							free(str);

							/*
							 * See notes in set_config_option about
							 * casting
							 */
							str = (char *) newstr;
							conf->reset_val = str;
						}
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					}
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					*conf->variable = str;
					break;
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				}
		}
	}

	guc_dirty = false;

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	reporting_enabled = false;

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	guc_string_workspace = NULL;

	/*
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	 * Prevent any attempt to override the transaction modes from
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	 * non-interactive sources.
	 */
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	SetConfigOption("transaction_isolation", "default",
					PGC_POSTMASTER, PGC_S_OVERRIDE);
	SetConfigOption("transaction_read_only", "no",
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					PGC_POSTMASTER, PGC_S_OVERRIDE);

	/*
	 * For historical reasons, some GUC parameters can receive defaults
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	 * from environment variables.	Process those settings.
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	 */

	env = getenv("PGPORT");
	if (env != NULL)
		SetConfigOption("port", env, PGC_POSTMASTER, PGC_S_ENV_VAR);

	env = getenv("PGDATESTYLE");
	if (env != NULL)
		SetConfigOption("datestyle", env, PGC_POSTMASTER, PGC_S_ENV_VAR);

	env = getenv("PGCLIENTENCODING");
	if (env != NULL)
		SetConfigOption("client_encoding", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
}


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/*
 * Select the configuration files and data directory to be used, and
 * do the initial read of postgresql.conf.
 *
 * This is called after processing command-line switches.
 *		userDoption is the -D switch value if any (NULL if unspecified).
 *		progname is just for use in error messages.
 *
 * Returns true on success; on failure, prints a suitable error message
 * to stderr and returns false.
 */
bool
SelectConfigFiles(const char *userDoption, const char *progname)
{
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	char	   *configdir;
	char	   *fname;
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	struct stat stat_buf;

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	/* configdir is -D option, or $PGDATA if no -D */
	if (userDoption)
		configdir = make_absolute_path(userDoption);
	else
		configdir = make_absolute_path(getenv("PGDATA"));
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	/*
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	 * Find the configuration file: if config_file was specified on the
	 * command line, use it, else use configdir/postgresql.conf.  In any
	 * case ensure the result is an absolute path, so that it will be
	 * interpreted the same way by future backends.
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	 */
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	if (ConfigFileName)
		fname = make_absolute_path(ConfigFileName);
	else if (!configdir)
2485
	{
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		write_stderr("%s does not know where to find the server configuration file.\n"
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					 "You must specify the --config-file or -D invocation "
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					 "option or set the PGDATA environment variable.\n",
					 progname);
		return false;
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	}
	else
	{
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		fname = guc_malloc(FATAL,
						   strlen(configdir) + strlen(CONFIG_FILENAME) + 2);
		sprintf(fname, "%s/%s", configdir, CONFIG_FILENAME);
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	}

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	/*
	 * Set the ConfigFileName GUC variable to its final value, ensuring
	 * that it can't be overridden later.
	 */
	SetConfigOption("config_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
	free(fname);

	/*
	 * Now read the config file for the first time.
	 */
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	if (stat(ConfigFileName, &stat_buf) != 0)
	{
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		write_stderr("%s cannot access the server configuration file \"%s\": %s\n",
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					 progname, ConfigFileName, strerror(errno));
		return false;
	}

	ProcessConfigFile(PGC_POSTMASTER);

	/*
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	 * If the data_directory GUC variable has been set, use that as DataDir;
	 * otherwise use configdir if set; else punt.
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	 *
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	 * Note: SetDataDir will copy and absolute-ize its argument,
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	 * so we don't have to.
	 */
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	if (data_directory)
		SetDataDir(data_directory);
	else if (configdir)
		SetDataDir(configdir);
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	else
	{
		write_stderr("%s does not know where to find the database system data.\n"
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					 "This can be specified as \"data_directory\" in \"%s\", "
					 "or by the -D invocation option, or by the "
					 "PGDATA environment variable.\n",
					 progname, ConfigFileName);
		return false;
	}

	/*
	 * Reflect the final DataDir value back into the data_directory GUC var.
	 * (If you are wondering why we don't just make them a single variable,
	 * it's because the EXEC_BACKEND case needs DataDir to be transmitted to
	 * child backends specially.)
	 */
	SetConfigOption("data_directory", DataDir, PGC_POSTMASTER, PGC_S_OVERRIDE);

	/*
	 * Figure out where pg_hba.conf is, and make sure the path is absolute.
	 */
	if (HbaFileName)
		fname = make_absolute_path(HbaFileName);
	else if (!configdir)
	{
		write_stderr("%s does not know where to find the \"hba\" configuration file.\n"
					 "This can be specified as \"hba_file\" in \"%s\", "
					 "or by the -D invocation option, or by the "
					 "PGDATA environment variable.\n",
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					 progname, ConfigFileName);
		return false;
	}
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	else
	{
		fname = guc_malloc(FATAL,
						   strlen(configdir) + strlen(HBA_FILENAME) + 2);
		sprintf(fname, "%s/%s", configdir, HBA_FILENAME);
	}
	SetConfigOption("hba_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
	free(fname);
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	/*
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	 * Likewise for pg_ident.conf.
2572
	 */
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	if (IdentFileName)
		fname = make_absolute_path(IdentFileName);
	else if (!configdir)
	{
		write_stderr("%s does not know where to find the \"ident\" configuration file.\n"
					 "This can be specified as \"ident_file\" in \"%s\", "
					 "or by the -D invocation option, or by the "
					 "PGDATA environment variable.\n",
					 progname, ConfigFileName);
		return false;
	}
	else
	{
		fname = guc_malloc(FATAL,
						   strlen(configdir) + strlen(IDENT_FILENAME) + 2);
		sprintf(fname, "%s/%s", configdir, IDENT_FILENAME);
	}
	SetConfigOption("ident_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
	free(fname);

	free(configdir);
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	/* If timezone is not set, determine what the OS uses */
	pg_timezone_initialize();

	return true;
}


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/*
 * Reset all options to their saved default values (implements RESET ALL)
 */
void
ResetAllOptions(void)
{
	int			i;

	for (i = 0; i < num_guc_variables; i++)
	{
		struct config_generic *gconf = guc_variables[i];

		/* Don't reset non-SET-able values */
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		if (gconf->context != PGC_SUSET &&
			gconf->context != PGC_USERSET)
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			continue;
		/* Don't reset if special exclusion from RESET ALL */
		if (gconf->flags & GUC_NO_RESET_ALL)
			continue;
		/* No need to reset if wasn't SET */
		if (gconf->source <= PGC_S_OVERRIDE)
			continue;

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		/* Save old value to support transaction abort */
		push_old_value(gconf);

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		switch (gconf->vartype)
		{
			case PGC_BOOL:
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				{
					struct config_bool *conf = (struct config_bool *) gconf;
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					if (conf->assign_hook)
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						if (!(*conf->assign_hook) (conf->reset_val, true,
												   PGC_S_SESSION))
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							elog(ERROR, "failed to reset %s", conf->gen.name);
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					*conf->variable = conf->reset_val;
					conf->tentative_val = conf->reset_val;
					conf->gen.source = conf->gen.reset_source;
					conf->gen.tentative_source = conf->gen.reset_source;
					conf->gen.status |= GUC_HAVE_TENTATIVE;
					guc_dirty = true;
					break;
				}
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			case PGC_INT:
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				{
					struct config_int *conf = (struct config_int *) gconf;
2649

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					if (conf->assign_hook)
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						if (!(*conf->assign_hook) (conf->reset_val, true,
												   PGC_S_SESSION))
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							elog(ERROR, "failed to reset %s", conf->gen.name);
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					*conf->variable = conf->reset_val;
					conf->tentative_val = conf->reset_val;
					conf->gen.source = conf->gen.reset_source;
					conf->gen.tentative_source = conf->gen.reset_source;
					conf->gen.status |= GUC_HAVE_TENTATIVE;
					guc_dirty = true;
					break;
				}
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			case PGC_REAL:
				{
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					struct config_real *conf = (struct config_real *) gconf;

					if (conf->assign_hook)
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						if (!(*conf->assign_hook) (conf->reset_val, true,
												   PGC_S_SESSION))
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							elog(ERROR, "failed to reset %s", conf->gen.name);
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					*conf->variable = conf->reset_val;
					conf->tentative_val = conf->reset_val;
					conf->gen.source = conf->gen.reset_source;
					conf->gen.tentative_source = conf->gen.reset_source;
					conf->gen.status |= GUC_HAVE_TENTATIVE;
					guc_dirty = true;
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					break;
				}
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			case PGC_STRING:
				{
					struct config_string *conf = (struct config_string *) gconf;
					char	   *str;
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					if (conf->reset_val == NULL)
					{
						/* Nothing to reset to, as yet; so do nothing */
						break;
					}
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					/* We need not strdup here */
					str = conf->reset_val;
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					if (conf->assign_hook)
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					{
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						const char *newstr;

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						newstr = (*conf->assign_hook) (str, true,
													   PGC_S_SESSION);
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						if (newstr == NULL)
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							elog(ERROR, "failed to reset %s", conf->gen.name);
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						else if (newstr != str)
						{
							/*
							 * See notes in set_config_option about
							 * casting
							 */
							str = (char *) newstr;
						}
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					}

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					set_string_field(conf, conf->variable, str);
					set_string_field(conf, &conf->tentative_val, str);
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					conf->gen.source = conf->gen.reset_source;
					conf->gen.tentative_source = conf->gen.reset_source;
					conf->gen.status |= GUC_HAVE_TENTATIVE;
					guc_dirty = true;
					break;
				}
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		}
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		if (gconf->flags & GUC_REPORT)
			ReportGUCOption(gconf);
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	}
}


/*
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 * push_old_value
 *		Push previous state during first assignment to a GUC variable
 *		within a particular transaction.
 *
 * We have to be willing to "back-fill" the state stack if the first
 * assignment occurs within a subtransaction nested several levels deep.
 * This ensures that if an intermediate transaction aborts, it will have
 * the proper value available to restore the setting to.
 */
static void
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push_old_value(struct config_generic * gconf)
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{
	int			my_level = GetCurrentTransactionNestLevel();
	GucStack   *stack;

	/* If we're not inside a transaction, do nothing */
	if (my_level == 0)
		return;

	for (;;)
	{
		/* Done if we already pushed it at this nesting depth */
		if (gconf->stack && gconf->stack->nest_level >= my_level)
			return;

		/*
		 * We keep all the stack entries in TopTransactionContext so as to
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		 * avoid allocation problems when a subtransaction back-fills
		 * stack entries for upper transaction levels.
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		 */
		stack = (GucStack *) MemoryContextAlloc(TopTransactionContext,
												sizeof(GucStack));

		stack->prev = gconf->stack;
		stack->nest_level = stack->prev ? stack->prev->nest_level + 1 : 1;
		stack->status = gconf->status;
		stack->tentative_source = gconf->tentative_source;
		stack->source = gconf->source;

		switch (gconf->vartype)
		{
			case PGC_BOOL:
				stack->tentative_val.boolval =
					((struct config_bool *) gconf)->tentative_val;
				stack->value.boolval =
					*((struct config_bool *) gconf)->variable;
				break;

			case PGC_INT:
				stack->tentative_val.intval =
					((struct config_int *) gconf)->tentative_val;
				stack->value.intval =
					*((struct config_int *) gconf)->variable;
				break;

			case PGC_REAL:
				stack->tentative_val.realval =
					((struct config_real *) gconf)->tentative_val;
				stack->value.realval =
					*((struct config_real *) gconf)->variable;
				break;

			case PGC_STRING:
				stack->tentative_val.stringval =
					((struct config_string *) gconf)->tentative_val;
				stack->value.stringval =
					*((struct config_string *) gconf)->variable;
				break;
		}

		gconf->stack = stack;

		/* Set state to indicate nothing happened yet within this level */
		gconf->status = GUC_HAVE_STACK;

		/* Ensure we remember to pop at end of xact */
		guc_dirty = true;
	}
}

/*
 * Do GUC processing at transaction or subtransaction commit or abort.
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 */
void
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AtEOXact_GUC(bool isCommit, bool isSubXact)
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{
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	int			my_level;
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	int			i;

	/* Quick exit if nothing's changed in this transaction */
	if (!guc_dirty)
		return;

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	/* Prevent memory leak if ereport during an assign_hook */
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	if (guc_string_workspace)
	{
		free(guc_string_workspace);
		guc_string_workspace = NULL;
	}

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	my_level = GetCurrentTransactionNestLevel();
	Assert(isSubXact ? (my_level > 1) : (my_level == 1));

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	for (i = 0; i < num_guc_variables; i++)
	{
		struct config_generic *gconf = guc_variables[i];
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		int			my_status = gconf->status;
		GucStack   *stack = gconf->stack;
		bool		useTentative;
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		bool		changed;
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		/*
		 * Skip if nothing's happened to this var in this transaction
		 */
		if (my_status == 0)
		{
			Assert(stack == NULL);
			continue;
		}
		/* Assert that we stacked old value before changing it */
		Assert(stack != NULL && (my_status & GUC_HAVE_STACK));
		/* However, the last change may have been at an outer xact level */
		if (stack->nest_level < my_level)
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			continue;
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		Assert(stack->nest_level == my_level);

		/*
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		 * We will pop the stack entry.  Start by restoring outer xact
		 * status (since we may want to modify it below).  Be careful to
		 * use my_status to reference the inner xact status below this
		 * point...
2858 2859 2860 2861 2862 2863
		 */
		gconf->status = stack->status;

		/*
		 * We have two cases:
		 *
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2864 2865 2866 2867 2868
		 * If commit and HAVE_TENTATIVE, set actual value to tentative (this
		 * is to override a SET LOCAL if one occurred later than SET). We
		 * keep the tentative value and propagate HAVE_TENTATIVE to the
		 * parent status, allowing the SET's effect to percolate up. (But
		 * if we're exiting the outermost transaction, we'll drop the
2869 2870
		 * HAVE_TENTATIVE bit below.)
		 *
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		 * Otherwise, we have a transaction that aborted or executed only SET
		 * LOCAL (or no SET at all).  In either case it should have no
		 * further effect, so restore both tentative and actual values
		 * from the stack entry.
2875
		 */
2876

2877
		useTentative = isCommit && (my_status & GUC_HAVE_TENTATIVE) != 0;
2878 2879
		changed = false;

2880 2881 2882 2883
		switch (gconf->vartype)
		{
			case PGC_BOOL:
				{
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2884
					struct config_bool *conf = (struct config_bool *) gconf;
2885 2886
					bool		newval;
					GucSource	newsource;
2887

2888 2889 2890 2891 2892 2893 2894
					if (useTentative)
					{
						newval = conf->tentative_val;
						newsource = conf->gen.tentative_source;
						conf->gen.status |= GUC_HAVE_TENTATIVE;
					}
					else
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2895
					{
2896 2897 2898 2899
						newval = stack->value.boolval;
						newsource = stack->source;
						conf->tentative_val = stack->tentative_val.boolval;
						conf->gen.tentative_source = stack->tentative_source;
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2900 2901
					}

2902
					if (*conf->variable != newval)
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					{
						if (conf->assign_hook)
2905
							if (!(*conf->assign_hook) (newval,
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2906
												   true, PGC_S_OVERRIDE))
2907 2908
								elog(LOG, "failed to commit %s",
									 conf->gen.name);
2909
						*conf->variable = newval;
2910
						changed = true;
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2911
					}
2912
					conf->gen.source = newsource;
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2913
					break;
2914 2915 2916
				}
			case PGC_INT:
				{
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2917
					struct config_int *conf = (struct config_int *) gconf;
2918 2919
					int			newval;
					GucSource	newsource;
2920

2921 2922 2923 2924 2925 2926 2927
					if (useTentative)
					{
						newval = conf->tentative_val;
						newsource = conf->gen.tentative_source;
						conf->gen.status |= GUC_HAVE_TENTATIVE;
					}
					else
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2928
					{
2929 2930 2931 2932
						newval = stack->value.intval;
						newsource = stack->source;
						conf->tentative_val = stack->tentative_val.intval;
						conf->gen.tentative_source = stack->tentative_source;
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2933 2934
					}

2935
					if (*conf->variable != newval)
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					{
						if (conf->assign_hook)
2938
							if (!(*conf->assign_hook) (newval,
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2939
												   true, PGC_S_OVERRIDE))
2940 2941
								elog(LOG, "failed to commit %s",
									 conf->gen.name);
2942
						*conf->variable = newval;
2943
						changed = true;
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2944
					}
2945
					conf->gen.source = newsource;
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2946
					break;
2947 2948 2949
				}
			case PGC_REAL:
				{
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2950
					struct config_real *conf = (struct config_real *) gconf;
2951 2952
					double		newval;
					GucSource	newsource;
2953

2954
					if (useTentative)
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2955
					{
2956 2957 2958 2959 2960 2961 2962 2963 2964 2965
						newval = conf->tentative_val;
						newsource = conf->gen.tentative_source;
						conf->gen.status |= GUC_HAVE_TENTATIVE;
					}
					else
					{
						newval = stack->value.realval;
						newsource = stack->source;
						conf->tentative_val = stack->tentative_val.realval;
						conf->gen.tentative_source = stack->tentative_source;
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2966
					}
2967

2968
					if (*conf->variable != newval)
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					{
						if (conf->assign_hook)
2971
							if (!(*conf->assign_hook) (newval,
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2972
												   true, PGC_S_OVERRIDE))
2973 2974
								elog(LOG, "failed to commit %s",
									 conf->gen.name);
2975
						*conf->variable = newval;
2976
						changed = true;
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2977
					}
2978
					conf->gen.source = newsource;
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					break;
2980
				}
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2981
			case PGC_STRING:
2982
				{
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					struct config_string *conf = (struct config_string *) gconf;
2984 2985
					char	   *newval;
					GucSource	newsource;
2986

2987
					if (useTentative)
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					{
2989 2990 2991
						newval = conf->tentative_val;
						newsource = conf->gen.tentative_source;
						conf->gen.status |= GUC_HAVE_TENTATIVE;
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					}
					else
2994
					{
2995 2996 2997 2998 2999 3000
						newval = stack->value.stringval;
						newsource = stack->source;
						set_string_field(conf, &conf->tentative_val,
										 stack->tentative_val.stringval);
						conf->gen.tentative_source = stack->tentative_source;
					}
3001

3002 3003
					if (*conf->variable != newval)
					{
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3004
						if (conf->assign_hook)
3005
						{
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							const char *newstr;

3008
							newstr = (*conf->assign_hook) (newval, true,
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3009
														 PGC_S_OVERRIDE);
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3010
							if (newstr == NULL)
3011 3012
								elog(LOG, "failed to commit %s",
									 conf->gen.name);
3013
							else if (newstr != newval)
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3014 3015
							{
								/*
3016 3017 3018
								 * If newval should now be freed, it'll be
								 * taken care of below.
								 *
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								 * See notes in set_config_option about
								 * casting
								 */
3022
								newval = (char *) newstr;
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3023
							}
3024 3025
						}

3026
						set_string_field(conf, conf->variable, newval);
3027
						changed = true;
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3028
					}
3029 3030 3031 3032 3033 3034 3035 3036 3037
					conf->gen.source = newsource;
					/* Release stacked values if not used anymore */
					set_string_field(conf, &stack->value.stringval,
									 NULL);
					set_string_field(conf, &stack->tentative_val.stringval,
									 NULL);
					/* Don't store tentative value separately after commit */
					if (!isSubXact)
						set_string_field(conf, &conf->tentative_val, NULL);
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3038
					break;
3039 3040
				}
		}
3041

3042 3043 3044 3045 3046
		/* Finish popping the state stack */
		gconf->stack = stack->prev;
		pfree(stack);

		/*
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		 * If we're now out of all xact levels, forget TENTATIVE status
		 * bit; there's nothing tentative about the value anymore.
3049 3050 3051 3052 3053 3054 3055 3056
		 */
		if (!isSubXact)
		{
			Assert(gconf->stack == NULL);
			gconf->status = 0;
		}

		/* Report new value if we changed it */
3057 3058
		if (changed && (gconf->flags & GUC_REPORT))
			ReportGUCOption(gconf);
3059 3060
	}

3061
	/*
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	 * If we're now out of all xact levels, we can clear guc_dirty. (Note:
	 * we cannot reset guc_dirty when exiting a subtransaction, because we
	 * know that all outer transaction levels will have stacked values to
	 * deal with.)
3066 3067 3068
	 */
	if (!isSubXact)
		guc_dirty = false;
3069 3070 3071
}


3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104
/*
 * Start up automatic reporting of changes to variables marked GUC_REPORT.
 * This is executed at completion of backend startup.
 */
void
BeginReportingGUCOptions(void)
{
	int			i;

	/*
	 * Don't do anything unless talking to an interactive frontend of
	 * protocol 3.0 or later.
	 */
	if (whereToSendOutput != Remote ||
		PG_PROTOCOL_MAJOR(FrontendProtocol) < 3)
		return;

	reporting_enabled = true;

	/* Transmit initial values of interesting variables */
	for (i = 0; i < num_guc_variables; i++)
	{
		struct config_generic *conf = guc_variables[i];

		if (conf->flags & GUC_REPORT)
			ReportGUCOption(conf);
	}
}

/*
 * ReportGUCOption: if appropriate, transmit option value to frontend
 */
static void
3105
ReportGUCOption(struct config_generic * record)
3106 3107 3108
{
	if (reporting_enabled && (record->flags & GUC_REPORT))
	{
3109
		char	   *val = _ShowOption(record);
3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121
		StringInfoData msgbuf;

		pq_beginmessage(&msgbuf, 'S');
		pq_sendstring(&msgbuf, record->name);
		pq_sendstring(&msgbuf, val);
		pq_endmessage(&msgbuf);

		pfree(val);
	}
}


3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132
/*
 * Try to interpret value as boolean value.  Valid values are: true,
 * false, yes, no, on, off, 1, 0.  If the string parses okay, return
 * true, else false.  If result is not NULL, return the parsing result
 * there.
 */
static bool
parse_bool(const char *value, bool *result)
{
	size_t		len = strlen(value);

3133
	if (pg_strncasecmp(value, "true", len) == 0)
3134 3135 3136 3137
	{
		if (result)
			*result = true;
	}
3138
	else if (pg_strncasecmp(value, "false", len) == 0)
3139 3140 3141 3142 3143
	{
		if (result)
			*result = false;
	}

3144
	else if (pg_strncasecmp(value, "yes", len) == 0)
3145 3146 3147 3148
	{
		if (result)
			*result = true;
	}
3149
	else if (pg_strncasecmp(value, "no", len) == 0)
3150 3151 3152 3153 3154
	{
		if (result)
			*result = false;
	}

3155
	else if (pg_strcasecmp(value, "on") == 0)
3156 3157 3158 3159
	{
		if (result)
			*result = true;
	}
3160
	else if (pg_strcasecmp(value, "off") == 0)
3161 3162 3163 3164 3165
	{
		if (result)
			*result = false;
	}

3166
	else if (pg_strcasecmp(value, "1") == 0)
3167 3168 3169 3170
	{
		if (result)
			*result = true;
	}
3171
	else if (pg_strcasecmp(value, "0") == 0)
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	{
		if (result)
			*result = false;
	}

	else
		return false;
	return true;
}



/*
 * Try to parse value as an integer.  The accepted formats are the
 * usual decimal, octal, or hexadecimal formats.  If the string parses
 * okay, return true, else false.  If result is not NULL, return the
 * value there.
 */
static bool
parse_int(const char *value, int *result)
{
	long		val;
	char	   *endptr;

	errno = 0;
	val = strtol(value, &endptr, 0);
	if (endptr == value || *endptr != '\0' || errno == ERANGE
#ifdef HAVE_LONG_INT_64
	/* if long > 32 bits, check for overflow of int4 */
		|| val != (long) ((int32) val)
#endif
		)
		return false;
	if (result)
		*result = (int) val;
	return true;
}



/*
 * Try to parse value as a floating point constant in the usual
 * format.	If the value parsed okay return true, else false.  If
 * result is not NULL, return the semantic value there.
 */
static bool
parse_real(const char *value, double *result)
{
	double		val;
	char	   *endptr;

	errno = 0;
	val = strtod(value, &endptr);
	if (endptr == value || *endptr != '\0' || errno == ERANGE)
		return false;
	if (result)
		*result = val;
	return true;
}



/*
 * Sets option `name' to given value. The value should be a string
 * which is going to be parsed and converted to the appropriate data
 * type.  The context and source parameters indicate in which context this
 * function is being called so it can apply the access restrictions
 * properly.
 *
 * If value is NULL, set the option to its default value. If the
3242
 * parameter changeVal is false then don't really set the option but do all
3243 3244 3245
 * the checks to see if it would work.
 *
 * If there is an error (non-existing option, invalid value) then an
3246 3247 3248 3249
 * ereport(ERROR) is thrown *unless* this is called in a context where we
 * don't want to ereport (currently, startup or SIGHUP config file reread).
 * In that case we write a suitable error message via ereport(DEBUG) and
 * return false. This is working around the deficiencies in the ereport
3250 3251 3252 3253 3254 3255 3256 3257 3258
 * mechanism, so don't blame me.  In all other cases, the function
 * returns true, including cases where the input is valid but we chose
 * not to apply it because of context or source-priority considerations.
 *
 * See also SetConfigOption for an external interface.
 */
bool
set_config_option(const char *name, const char *value,
				  GucContext context, GucSource source,
3259
				  bool isLocal, bool changeVal)
3260 3261 3262
{
	struct config_generic *record;
	int			elevel;
3263
	bool		makeDefault;
3264 3265

	if (context == PGC_SIGHUP || source == PGC_S_DEFAULT)
3266 3267 3268 3269 3270 3271 3272
	{
		/*
		 * To avoid cluttering the log, only the postmaster bleats loudly
		 * about problems with the config file.
		 */
		elevel = IsUnderPostmaster ? DEBUG2 : LOG;
	}
3273 3274 3275 3276 3277
	else if (source == PGC_S_DATABASE || source == PGC_S_USER)
		elevel = INFO;
	else
		elevel = ERROR;

3278
	record = find_option(name, elevel);
3279 3280
	if (record == NULL)
	{
3281 3282
		ereport(elevel,
				(errcode(ERRCODE_UNDEFINED_OBJECT),
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		   errmsg("unrecognized configuration parameter \"%s\"", name)));
3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294
		return false;
	}

	/*
	 * Check if the option can be set at this time. See guc.h for the
	 * precise rules. Note that we don't want to throw errors if we're in
	 * the SIGHUP context. In that case we just ignore the attempt and
	 * return true.
	 */
	switch (record->context)
	{
3295 3296 3297 3298 3299
		case PGC_INTERNAL:
			if (context == PGC_SIGHUP)
				return true;
			if (context != PGC_INTERNAL)
			{
3300 3301
				ereport(elevel,
						(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
3302
						 errmsg("parameter \"%s\" cannot be changed",
3303
								name)));
3304 3305 3306
				return false;
			}
			break;
3307 3308 3309 3310 3311
		case PGC_POSTMASTER:
			if (context == PGC_SIGHUP)
				return true;
			if (context != PGC_POSTMASTER)
			{
3312 3313
				ereport(elevel,
						(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
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3314 3315
						 errmsg("parameter \"%s\" cannot be changed after server start",
								name)));
3316 3317 3318 3319 3320 3321
				return false;
			}
			break;
		case PGC_SIGHUP:
			if (context != PGC_SIGHUP && context != PGC_POSTMASTER)
			{
3322 3323
				ereport(elevel,
						(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
3324
						 errmsg("parameter \"%s\" cannot be changed now",
3325
								name)));
3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351
				return false;
			}

			/*
			 * Hmm, the idea of the SIGHUP context is "ought to be global,
			 * but can be changed after postmaster start". But there's
			 * nothing that prevents a crafty administrator from sending
			 * SIGHUP signals to individual backends only.
			 */
			break;
		case PGC_BACKEND:
			if (context == PGC_SIGHUP)
			{
				/*
				 * If a PGC_BACKEND parameter is changed in the config
				 * file, we want to accept the new value in the postmaster
				 * (whence it will propagate to subsequently-started
				 * backends), but ignore it in existing backends.  This is
				 * a tad klugy, but necessary because we don't re-read the
				 * config file during backend start.
				 */
				if (IsUnderPostmaster)
					return true;
			}
			else if (context != PGC_BACKEND && context != PGC_POSTMASTER)
			{
3352 3353
				ereport(elevel,
						(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
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3354 3355
						 errmsg("parameter \"%s\" cannot be set after connection start",
								name)));
3356 3357 3358 3359 3360 3361
				return false;
			}
			break;
		case PGC_SUSET:
			if (context == PGC_USERSET || context == PGC_BACKEND)
			{
3362 3363
				ereport(elevel,
						(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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3364 3365
					  errmsg("permission denied to set parameter \"%s\"",
							 name)));
3366
				return false;
3367 3368 3369 3370 3371
			}
			break;
		case PGC_USERSET:
			/* always okay */
			break;
3372
	}
3373

3374
	/*
3375
	 * Should we set reset/stacked values?	(If so, the behavior is not
3376 3377
	 * transactional.)
	 */
3378
	makeDefault = changeVal && (source <= PGC_S_OVERRIDE) && (value != NULL);
3379 3380 3381

	/*
	 * Ignore attempted set if overridden by previously processed setting.
3382
	 * However, if changeVal is false then plow ahead anyway since we are
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	 * trying to find out if the value is potentially good, not actually
	 * use it. Also keep going if makeDefault is true, since we may want
3385
	 * to set the reset/stacked values even if we can't set the variable
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3386
	 * itself.
3387 3388 3389
	 */
	if (record->source > source)
	{
3390
		if (changeVal && !makeDefault)
3391
		{
3392
			elog(DEBUG3, "\"%s\": setting ignored because previous source is higher priority",
3393 3394 3395
				 name);
			return true;
		}
3396
		changeVal = false;
3397 3398
	}

3399
	/*
3400
	 * Evaluate value and set variable.
3401
	 */
3402
	switch (record->vartype)
3403 3404 3405
	{
		case PGC_BOOL:
			{
3406
				struct config_bool *conf = (struct config_bool *) record;
3407
				bool		newval;
3408 3409

				if (value)
3410
				{
3411 3412
					if (!parse_bool(value, &newval))
					{
3413 3414
						ereport(elevel,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3415
								 errmsg("parameter \"%s\" requires a Boolean value",
3416
										name)));
3417 3418 3419 3420 3421 3422 3423 3424
						return false;
					}
				}
				else
				{
					newval = conf->reset_val;
					source = conf->gen.reset_source;
				}
3425

3426
				if (conf->assign_hook)
3427
					if (!(*conf->assign_hook) (newval, changeVal, source))
3428
					{
3429 3430
						ereport(elevel,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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3431 3432
						 errmsg("invalid value for parameter \"%s\": %d",
								name, (int) newval)));
3433 3434
						return false;
					}
3435

3436
				if (changeVal || makeDefault)
3437
				{
3438 3439 3440
					/* Save old value to support transaction abort */
					if (!makeDefault)
						push_old_value(&conf->gen);
3441
					if (changeVal)
3442
					{
3443 3444 3445 3446 3447
						*conf->variable = newval;
						conf->gen.source = source;
					}
					if (makeDefault)
					{
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3448
						GucStack   *stack;
3449

3450 3451 3452 3453 3454
						if (conf->gen.reset_source <= source)
						{
							conf->reset_val = newval;
							conf->gen.reset_source = source;
						}
3455
						for (stack = conf->gen.stack; stack; stack = stack->prev)
3456
						{
3457 3458 3459 3460 3461
							if (stack->source <= source)
							{
								stack->value.boolval = newval;
								stack->source = source;
							}
3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474
						}
					}
					else if (isLocal)
					{
						conf->gen.status |= GUC_HAVE_LOCAL;
						guc_dirty = true;
					}
					else
					{
						conf->tentative_val = newval;
						conf->gen.tentative_source = source;
						conf->gen.status |= GUC_HAVE_TENTATIVE;
						guc_dirty = true;
3475
					}
3476
				}
3477
				break;
3478
			}
3479 3480

		case PGC_INT:
3481
			{
3482
				struct config_int *conf = (struct config_int *) record;
3483
				int			newval;
3484

3485
				if (value)
3486
				{
3487
					if (!parse_int(value, &newval))
3488
					{
3489 3490
						ereport(elevel,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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3491 3492
								 errmsg("parameter \"%s\" requires an integer value",
										name)));
3493 3494
						return false;
					}
3495
					if (newval < conf->min || newval > conf->max)
3496
					{
3497 3498
						ereport(elevel,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3499
								 errmsg("%d is outside the valid range for parameter \"%s\" (%d .. %d)",
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3500
								   newval, name, conf->min, conf->max)));
3501 3502
						return false;
					}
3503 3504 3505 3506 3507 3508 3509 3510
				}
				else
				{
					newval = conf->reset_val;
					source = conf->gen.reset_source;
				}

				if (conf->assign_hook)
3511
					if (!(*conf->assign_hook) (newval, changeVal, source))
3512
					{
3513 3514
						ereport(elevel,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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3515 3516
						 errmsg("invalid value for parameter \"%s\": %d",
								name, newval)));
3517 3518
						return false;
					}
3519

3520
				if (changeVal || makeDefault)
3521
				{
3522 3523 3524
					/* Save old value to support transaction abort */
					if (!makeDefault)
						push_old_value(&conf->gen);
3525
					if (changeVal)
3526
					{
3527 3528 3529 3530 3531
						*conf->variable = newval;
						conf->gen.source = source;
					}
					if (makeDefault)
					{
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3532
						GucStack   *stack;
3533

3534 3535 3536 3537 3538
						if (conf->gen.reset_source <= source)
						{
							conf->reset_val = newval;
							conf->gen.reset_source = source;
						}
3539
						for (stack = conf->gen.stack; stack; stack = stack->prev)
3540
						{
3541 3542 3543 3544 3545
							if (stack->source <= source)
							{
								stack->value.intval = newval;
								stack->source = source;
							}
3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558
						}
					}
					else if (isLocal)
					{
						conf->gen.status |= GUC_HAVE_LOCAL;
						guc_dirty = true;
					}
					else
					{
						conf->tentative_val = newval;
						conf->gen.tentative_source = source;
						conf->gen.status |= GUC_HAVE_TENTATIVE;
						guc_dirty = true;
3559
					}
3560
				}
3561
				break;
3562
			}
3563 3564

		case PGC_REAL:
3565
			{
3566
				struct config_real *conf = (struct config_real *) record;
3567
				double		newval;
3568

3569
				if (value)
3570
				{
3571
					if (!parse_real(value, &newval))
3572
					{
3573 3574
						ereport(elevel,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3575
								 errmsg("parameter \"%s\" requires a numeric value",
3576
										name)));
3577 3578
						return false;
					}
3579
					if (newval < conf->min || newval > conf->max)
3580
					{
3581 3582
						ereport(elevel,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3583
								 errmsg("%g is outside the valid range for parameter \"%s\" (%g .. %g)",
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3584
								   newval, name, conf->min, conf->max)));
3585 3586
						return false;
					}
3587 3588 3589 3590 3591 3592 3593 3594
				}
				else
				{
					newval = conf->reset_val;
					source = conf->gen.reset_source;
				}

				if (conf->assign_hook)
3595
					if (!(*conf->assign_hook) (newval, changeVal, source))
3596
					{
3597 3598
						ereport(elevel,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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3599 3600
						 errmsg("invalid value for parameter \"%s\": %g",
								name, newval)));
3601 3602
						return false;
					}
3603

3604
				if (changeVal || makeDefault)
3605
				{
3606 3607 3608
					/* Save old value to support transaction abort */
					if (!makeDefault)
						push_old_value(&conf->gen);
3609
					if (changeVal)
3610
					{
3611 3612 3613 3614 3615
						*conf->variable = newval;
						conf->gen.source = source;
					}
					if (makeDefault)
					{
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3616
						GucStack   *stack;
3617

3618 3619 3620 3621 3622
						if (conf->gen.reset_source <= source)
						{
							conf->reset_val = newval;
							conf->gen.reset_source = source;
						}
3623
						for (stack = conf->gen.stack; stack; stack = stack->prev)
3624
						{
3625 3626 3627 3628 3629
							if (stack->source <= source)
							{
								stack->value.realval = newval;
								stack->source = source;
							}
3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642
						}
					}
					else if (isLocal)
					{
						conf->gen.status |= GUC_HAVE_LOCAL;
						guc_dirty = true;
					}
					else
					{
						conf->tentative_val = newval;
						conf->gen.tentative_source = source;
						conf->gen.status |= GUC_HAVE_TENTATIVE;
						guc_dirty = true;
3643
					}
3644
				}
3645
				break;
3646
			}
3647 3648 3649

		case PGC_STRING:
			{
3650
				struct config_string *conf = (struct config_string *) record;
3651
				char	   *newval;
3652 3653

				if (value)
3654
				{
3655
					newval = guc_strdup(elevel, value);
3656 3657 3658 3659 3660
					if (newval == NULL)
						return false;
				}
				else if (conf->reset_val)
				{
3661 3662
					/*
					 * We could possibly avoid strdup here, but easier to
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3663 3664
					 * make this case work the same as the normal
					 * assignment case.
3665
					 */
3666
					newval = guc_strdup(elevel, conf->reset_val);
3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678
					if (newval == NULL)
						return false;
					source = conf->gen.reset_source;
				}
				else
				{
					/* Nothing to reset to, as yet; so do nothing */
					break;
				}

				/*
				 * Remember string in workspace, so that we can free it
3679
				 * and avoid a permanent memory leak if hook ereports.
3680 3681 3682 3683 3684 3685 3686
				 */
				if (guc_string_workspace)
					free(guc_string_workspace);
				guc_string_workspace = newval;

				if (conf->assign_hook)
				{
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3687
					const char *hookresult;
3688 3689

					hookresult = (*conf->assign_hook) (newval,
3690
													   changeVal, source);
3691 3692
					guc_string_workspace = NULL;
					if (hookresult == NULL)
3693
					{
3694
						free(newval);
3695 3696
						ereport(elevel,
								(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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3697 3698
								 errmsg("invalid value for parameter \"%s\": \"%s\"",
										name, value ? value : "")));
3699 3700
						return false;
					}
3701
					else if (hookresult != newval)
3702
					{
3703
						free(newval);
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3704

3705
						/*
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3706 3707 3708 3709 3710 3711 3712
						 * Having to cast away const here is annoying, but
						 * the alternative is to declare assign_hooks as
						 * returning char*, which would mean they'd have
						 * to cast away const, or as both taking and
						 * returning char*, which doesn't seem attractive
						 * either --- we don't want them to scribble on
						 * the passed str.
3713 3714 3715 3716 3717 3718
						 */
						newval = (char *) hookresult;
					}
				}

				guc_string_workspace = NULL;
3719

3720
				if (changeVal || makeDefault)
3721
				{
3722 3723 3724
					/* Save old value to support transaction abort */
					if (!makeDefault)
						push_old_value(&conf->gen);
3725
					if (changeVal)
3726
					{
3727
						set_string_field(conf, conf->variable, newval);
3728 3729 3730 3731
						conf->gen.source = source;
					}
					if (makeDefault)
					{
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3732
						GucStack   *stack;
3733

3734
						if (conf->gen.reset_source <= source)
3735
						{
3736
							set_string_field(conf, &conf->reset_val, newval);
3737
							conf->gen.reset_source = source;
3738
						}
3739
						for (stack = conf->gen.stack; stack; stack = stack->prev)
3740
						{
3741 3742 3743 3744 3745 3746
							if (stack->source <= source)
							{
								set_string_field(conf, &stack->value.stringval,
												 newval);
								stack->source = source;
							}
3747
						}
3748
						/* Perhaps we didn't install newval anywhere */
3749
						if (!string_field_used(conf, newval))
3750
							free(newval);
3751
					}
3752
					else if (isLocal)
3753
					{
3754 3755
						conf->gen.status |= GUC_HAVE_LOCAL;
						guc_dirty = true;
3756
					}
3757
					else
3758
					{
3759
						set_string_field(conf, &conf->tentative_val, newval);
3760 3761 3762
						conf->gen.tentative_source = source;
						conf->gen.status |= GUC_HAVE_TENTATIVE;
						guc_dirty = true;
3763
					}
3764 3765 3766
				}
				else
					free(newval);
3767
				break;
3768
			}
3769
	}
3770

3771
	if (changeVal && (record->flags & GUC_REPORT))
3772
		ReportGUCOption(record);
3773

3774 3775 3776 3777 3778 3779
	return true;
}


/*
 * Set a config option to the given value. See also set_config_option,
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3780
 * this is just the wrapper to be called from outside GUC.	NB: this
3781
 * is used only for non-transactional operations.
3782 3783
 */
void
3784
SetConfigOption(const char *name, const char *value,
3785
				GucContext context, GucSource source)
3786
{
3787
	(void) set_config_option(name, value, context, source, false, true);
3788 3789 3790 3791 3792
}



/*
3793
 * Fetch the current value of the option `name'. If the option doesn't exist,
3794
 * throw an ereport and don't return.
3795 3796 3797 3798 3799
 *
 * The string is *not* allocated for modification and is really only
 * valid until the next call to configuration related functions.
 */
const char *
3800
GetConfigOption(const char *name)
3801
{
3802
	struct config_generic *record;
3803 3804
	static char buffer[256];

3805
	record = find_option(name, ERROR);
3806
	if (record == NULL)
3807 3808
		ereport(ERROR,
				(errcode(ERRCODE_UNDEFINED_OBJECT),
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3809
		   errmsg("unrecognized configuration parameter \"%s\"", name)));
3810 3811 3812 3813
	if ((record->flags & GUC_SUPERUSER_ONLY) && !superuser())
		ereport(ERROR,
				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
				 errmsg("must be superuser to examine \"%s\"", name)));
3814

3815
	switch (record->vartype)
3816 3817
	{
		case PGC_BOOL:
3818
			return *((struct config_bool *) record)->variable ? "on" : "off";
3819

3820
		case PGC_INT:
3821 3822
			snprintf(buffer, sizeof(buffer), "%d",
					 *((struct config_int *) record)->variable);
3823 3824
			return buffer;

3825
		case PGC_REAL:
3826 3827
			snprintf(buffer, sizeof(buffer), "%g",
					 *((struct config_real *) record)->variable);
3828 3829 3830
			return buffer;

		case PGC_STRING:
3831
			return *((struct config_string *) record)->variable;
3832 3833 3834
	}
	return NULL;
}
3835

3836 3837 3838 3839 3840
/*
 * Get the RESET value associated with the given option.
 */
const char *
GetConfigOptionResetString(const char *name)
3841
{
3842 3843
	struct config_generic *record;
	static char buffer[256];
3844

3845
	record = find_option(name, ERROR);
3846
	if (record == NULL)
3847 3848
		ereport(ERROR,
				(errcode(ERRCODE_UNDEFINED_OBJECT),
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3849
		   errmsg("unrecognized configuration parameter \"%s\"", name)));
3850 3851 3852 3853
	if ((record->flags & GUC_SUPERUSER_ONLY) && !superuser())
		ereport(ERROR,
				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
				 errmsg("must be superuser to examine \"%s\"", name)));
3854 3855

	switch (record->vartype)
3856 3857
	{
		case PGC_BOOL:
3858
			return ((struct config_bool *) record)->reset_val ? "on" : "off";
3859

3860
		case PGC_INT:
3861
			snprintf(buffer, sizeof(buffer), "%d",
3862 3863
					 ((struct config_int *) record)->reset_val);
			return buffer;
3864 3865

		case PGC_REAL:
3866
			snprintf(buffer, sizeof(buffer), "%g",
3867 3868
					 ((struct config_real *) record)->reset_val);
			return buffer;
3869 3870

		case PGC_STRING:
3871 3872 3873 3874
			return ((struct config_string *) record)->reset_val;
	}
	return NULL;
}
3875

3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890
/*
 * Detect whether the given configuration option can only be set by
 * a superuser.
 */
bool
IsSuperuserConfigOption(const char *name)
{
	struct config_generic *record;

	record = find_option(name, ERROR);
	/* On an unrecognized name, don't error, just return false. */
	if (record == NULL)
		return false;
	return (record->context == PGC_SUSET);
}
3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909


/*
 * flatten_set_variable_args
 *		Given a parsenode List as emitted by the grammar for SET,
 *		convert to the flat string representation used by GUC.
 *
 * We need to be told the name of the variable the args are for, because
 * the flattening rules vary (ugh).
 *
 * The result is NULL if input is NIL (ie, SET ... TO DEFAULT), otherwise
 * a palloc'd string.
 */
char *
flatten_set_variable_args(const char *name, List *args)
{
	struct config_generic *record;
	int			flags;
	StringInfoData buf;
3910
	ListCell   *l;
3911

3912 3913 3914 3915
	/*
	 * Fast path if just DEFAULT.  We do not check the variable name in
	 * this case --- necessary for RESET ALL to work correctly.
	 */
3916 3917 3918
	if (args == NIL)
		return NULL;

3919
	/* Else get flags for the variable */
3920
	record = find_option(name, ERROR);
3921
	if (record == NULL)
3922 3923
		ereport(ERROR,
				(errcode(ERRCODE_UNDEFINED_OBJECT),
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Bruce Momjian committed
3924
		   errmsg("unrecognized configuration parameter \"%s\"", name)));
3925 3926

	flags = record->flags;
3927 3928 3929

	/* Complain if list input and non-list variable */
	if ((flags & GUC_LIST_INPUT) == 0 &&
3930
		list_length(args) != 1)
3931 3932 3933
		ereport(ERROR,
				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
				 errmsg("SET %s takes only one argument", name)));
3934 3935 3936 3937 3938 3939 3940 3941

	initStringInfo(&buf);

	foreach(l, args)
	{
		A_Const    *arg = (A_Const *) lfirst(l);
		char	   *val;

3942
		if (l != list_head(args))
3943 3944 3945
			appendStringInfo(&buf, ", ");

		if (!IsA(arg, A_Const))
3946
			elog(ERROR, "unrecognized node type: %d", (int) nodeTag(arg));
3947 3948 3949 3950 3951 3952 3953 3954

		switch (nodeTag(&arg->val))
		{
			case T_Integer:
				appendStringInfo(&buf, "%ld", intVal(&arg->val));
				break;
			case T_Float:
				/* represented as a string, so just copy it */
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3955
				appendStringInfoString(&buf, strVal(&arg->val));
3956 3957 3958 3959 3960 3961 3962 3963 3964 3965
				break;
			case T_String:
				val = strVal(&arg->val);
				if (arg->typename != NULL)
				{
					/*
					 * Must be a ConstInterval argument for TIME ZONE.
					 * Coerce to interval and back to normalize the value
					 * and account for any typmod.
					 */
3966
					Datum interval;
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3967
					char	   *intervalout;
3968 3969

					interval =
3970 3971 3972
					DirectFunctionCall3(interval_in,
										CStringGetDatum(val),
										ObjectIdGetDatum(InvalidOid),
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3973
								   Int32GetDatum(arg->typename->typmod));
3974 3975 3976 3977

					intervalout =
						DatumGetCString(DirectFunctionCall3(interval_out,
															interval,
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3978 3979
											ObjectIdGetDatum(InvalidOid),
													 Int32GetDatum(-1)));
3980 3981 3982 3983 3984
					appendStringInfo(&buf, "INTERVAL '%s'", intervalout);
				}
				else
				{
					/*
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3985 3986
					 * Plain string literal or identifier.	For quote
					 * mode, quote it if it's not a vanilla identifier.
3987 3988
					 */
					if (flags & GUC_LIST_QUOTE)
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3989
						appendStringInfoString(&buf, quote_identifier(val));
3990
					else
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3991
						appendStringInfoString(&buf, val);
3992 3993 3994
				}
				break;
			default:
3995 3996
				elog(ERROR, "unrecognized node type: %d",
					 (int) nodeTag(&arg->val));
3997 3998
				break;
		}
3999
	}
4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021

	return buf.data;
}


/*
 * SET command
 */
void
SetPGVariable(const char *name, List *args, bool is_local)
{
	char	   *argstring = flatten_set_variable_args(name, args);

	/* Note SET DEFAULT (argstring == NULL) is equivalent to RESET */
	set_config_option(name,
					  argstring,
					  (superuser() ? PGC_SUSET : PGC_USERSET),
					  PGC_S_SESSION,
					  is_local,
					  true);
}

4022 4023 4024 4025 4026 4027
/*
 * SET command wrapped as a SQL callable function.
 */
Datum
set_config_by_name(PG_FUNCTION_ARGS)
{
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4028 4029 4030 4031 4032
	char	   *name;
	char	   *value;
	char	   *new_value;
	bool		is_local;
	text	   *result_text;
4033 4034

	if (PG_ARGISNULL(0))
4035 4036
		ereport(ERROR,
				(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
4037
				 errmsg("SET requires parameter name")));
4038 4039

	/* Get the GUC variable name */
4040
	name = DatumGetCString(DirectFunctionCall1(textout, PG_GETARG_DATUM(0)));
4041 4042 4043 4044 4045

	/* Get the desired value or set to NULL for a reset request */
	if (PG_ARGISNULL(1))
		value = NULL;
	else
4046
		value = DatumGetCString(DirectFunctionCall1(textout, PG_GETARG_DATUM(1)));
4047 4048

	/*
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4049 4050
	 * Get the desired state of is_local. Default to false if provided
	 * value is NULL
4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065
	 */
	if (PG_ARGISNULL(2))
		is_local = false;
	else
		is_local = PG_GETARG_BOOL(2);

	/* Note SET DEFAULT (argstring == NULL) is equivalent to RESET */
	set_config_option(name,
					  value,
					  (superuser() ? PGC_SUSET : PGC_USERSET),
					  PGC_S_SESSION,
					  is_local,
					  true);

	/* get the new current value */
4066
	new_value = GetConfigOptionByName(name, NULL);
4067 4068 4069 4070 4071 4072 4073 4074

	/* Convert return string to text */
	result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(new_value)));

	/* return it */
	PG_RETURN_TEXT_P(result_text);
}

4075
static void
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4076
define_custom_variable(struct config_generic * variable)
4077
{
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	const char *name = variable->name;
	const char **nameAddr = &name;
	const char *value;
	struct config_string *pHolder;
	struct config_generic **res = (struct config_generic **) bsearch(
													  (void *) &nameAddr,
												  (void *) guc_variables,
													   num_guc_variables,
										 sizeof(struct config_generic *),
														guc_var_compare);

	if (res == NULL)
4090
	{
4091
		add_guc_variable(variable, ERROR);
4092 4093 4094
		return;
	}

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	/*
	 * This better be a placeholder
4097
	 */
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4098
	if (((*res)->flags & GUC_CUSTOM_PLACEHOLDER) == 0)
4099 4100 4101
		ereport(ERROR,
				(errcode(ERRCODE_INTERNAL_ERROR),
				 errmsg("attempt to redefine parameter \"%s\"", name)));
4102 4103

	Assert((*res)->vartype == PGC_STRING);
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	pHolder = (struct config_string *) * res;

4106
	/* We have the same name, no sorting is necessary */
4107 4108 4109 4110
	*res = variable;

	value = *pHolder->variable;

4111
	/*
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	 * Assign the string value stored in the placeholder to the real
	 * variable.
4114 4115 4116 4117
	 *
	 * XXX this is not really good enough --- it should be a nontransactional
	 * assignment, since we don't want it to roll back if the current xact
	 * fails later.
4118 4119
	 */
	set_config_option(name, value,
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					  pHolder->gen.context, pHolder->gen.source,
					  false, true);
4122

4123 4124 4125
	/*
	 * Free up as much as we conveniently can of the placeholder structure
	 * (this neglects any stack items...)
4126
	 */
4127 4128 4129
	set_string_field(pHolder, pHolder->variable, NULL);
	set_string_field(pHolder, &pHolder->reset_val, NULL);
	set_string_field(pHolder, &pHolder->tentative_val, NULL);
4130 4131 4132 4133

	free(pHolder);
}

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static void
4135
init_custom_variable(struct config_generic * gen,
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					 const char *name,
					 const char *short_desc,
					 const char *long_desc,
					 GucContext context,
					 enum config_type type)
4141
{
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	gen->name = guc_strdup(ERROR, name);
	gen->context = context;
	gen->group = CUSTOM_OPTIONS;
4145
	gen->short_desc = short_desc;
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	gen->long_desc = long_desc;
	gen->vartype = type;
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}

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void
DefineCustomBoolVariable(
						 const char *name,
						 const char *short_desc,
						 const char *long_desc,
						 bool *valueAddr,
						 GucContext context,
						 GucBoolAssignHook assign_hook,
						 GucShowHook show_hook)
4159
{
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	size_t		sz = sizeof(struct config_bool);
	struct config_bool *var = (struct config_bool *) guc_malloc(ERROR, sz);
4162 4163 4164 4165

	memset(var, 0, sz);
	init_custom_variable(&var->gen, name, short_desc, long_desc, context, PGC_BOOL);

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	var->variable = valueAddr;
	var->reset_val = *valueAddr;
4168
	var->assign_hook = assign_hook;
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	var->show_hook = show_hook;
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	define_custom_variable(&var->gen);
}

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void
DefineCustomIntVariable(
						const char *name,
						const char *short_desc,
						const char *long_desc,
						int *valueAddr,
						GucContext context,
						GucIntAssignHook assign_hook,
						GucShowHook show_hook)
4182
{
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	size_t		sz = sizeof(struct config_int);
	struct config_int *var = (struct config_int *) guc_malloc(ERROR, sz);
4185 4186 4187 4188

	memset(var, 0, sz);
	init_custom_variable(&var->gen, name, short_desc, long_desc, context, PGC_INT);

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	var->variable = valueAddr;
	var->reset_val = *valueAddr;
4191
	var->assign_hook = assign_hook;
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	var->show_hook = show_hook;
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	define_custom_variable(&var->gen);
}

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void
DefineCustomRealVariable(
						 const char *name,
						 const char *short_desc,
						 const char *long_desc,
						 double *valueAddr,
						 GucContext context,
						 GucRealAssignHook assign_hook,
						 GucShowHook show_hook)
4205
{
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	size_t		sz = sizeof(struct config_real);
	struct config_real *var = (struct config_real *) guc_malloc(ERROR, sz);
4208 4209 4210 4211

	memset(var, 0, sz);
	init_custom_variable(&var->gen, name, short_desc, long_desc, context, PGC_REAL);

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	var->variable = valueAddr;
	var->reset_val = *valueAddr;
4214
	var->assign_hook = assign_hook;
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	var->show_hook = show_hook;
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	define_custom_variable(&var->gen);
}

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void
DefineCustomStringVariable(
						   const char *name,
						   const char *short_desc,
						   const char *long_desc,
						   char **valueAddr,
						   GucContext context,
						   GucStringAssignHook assign_hook,
						   GucShowHook show_hook)
4228
{
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	size_t		sz = sizeof(struct config_string);
	struct config_string *var = (struct config_string *) guc_malloc(ERROR, sz);
4231 4232 4233 4234

	memset(var, 0, sz);
	init_custom_variable(&var->gen, name, short_desc, long_desc, context, PGC_STRING);

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	var->variable = valueAddr;
	var->reset_val = *valueAddr;
4237
	var->assign_hook = assign_hook;
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	var->show_hook = show_hook;
4239 4240 4241
	define_custom_variable(&var->gen);
}

4242
void
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4243
EmitWarningsOnPlaceholders(const char *className)
4244
{
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	struct config_generic **vars = guc_variables;
	struct config_generic **last = vars + num_guc_variables;

	int			nameLen = strlen(className);
4249

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	while (vars < last)
4251
	{
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		struct config_generic *var = *vars++;

		if ((var->flags & GUC_CUSTOM_PLACEHOLDER) != 0 &&
			strncmp(className, var->name, nameLen) == 0 &&
			var->name[nameLen] == GUC_QUALIFIER_SEPARATOR)
4257 4258
		{
			ereport(INFO,
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4259 4260
					(errcode(ERRCODE_UNDEFINED_OBJECT),
					 errmsg("unrecognized configuration parameter \"%s\"", var->name)));
4261 4262 4263 4264 4265
		}
	}
}


4266 4267 4268 4269
/*
 * SHOW command
 */
void
4270
GetPGVariable(const char *name, DestReceiver *dest)
4271
{
4272
	if (pg_strcasecmp(name, "all") == 0)
4273
		ShowAllGUCConfig(dest);
4274
	else
4275 4276 4277 4278 4279 4280 4281 4282
		ShowGUCConfigOption(name, dest);
}

TupleDesc
GetPGVariableResultDesc(const char *name)
{
	TupleDesc	tupdesc;

4283
	if (pg_strcasecmp(name, "all") == 0)
4284 4285 4286 4287
	{
		/* need a tuple descriptor representing two TEXT columns */
		tupdesc = CreateTemplateTupleDesc(2, false);
		TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
4288
						   TEXTOID, -1, 0);
4289
		TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
4290
						   TEXTOID, -1, 0);
4291 4292 4293 4294 4295 4296 4297 4298 4299 4300
	}
	else
	{
		const char *varname;

		/* Get the canonical spelling of name */
		(void) GetConfigOptionByName(name, &varname);

		/* need a tuple descriptor representing a single TEXT column */
		tupdesc = CreateTemplateTupleDesc(1, false);
4301
		TupleDescInitEntry(tupdesc, (AttrNumber) 1, varname,
4302
						   TEXTOID, -1, 0);
4303 4304
	}
	return tupdesc;
4305 4306 4307 4308 4309 4310 4311 4312
}

/*
 * RESET command
 */
void
ResetPGVariable(const char *name)
{
4313
	if (pg_strcasecmp(name, "all") == 0)
4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327
		ResetAllOptions();
	else
		set_config_option(name,
						  NULL,
						  (superuser() ? PGC_SUSET : PGC_USERSET),
						  PGC_S_SESSION,
						  false,
						  true);
}


/*
 * SHOW command
 */
4328
static void
4329
ShowGUCConfigOption(const char *name, DestReceiver *dest)
4330
{
4331
	TupOutputState *tstate;
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	TupleDesc	tupdesc;
	const char *varname;
	char	   *value;
4335

4336 4337 4338
	/* Get the value and canonical spelling of name */
	value = GetConfigOptionByName(name, &varname);

4339
	/* need a tuple descriptor representing a single TEXT column */
4340
	tupdesc = CreateTemplateTupleDesc(1, false);
4341
	TupleDescInitEntry(tupdesc, (AttrNumber) 1, varname,
4342
					   TEXTOID, -1, 0);
4343

4344 4345 4346 4347
	/* prepare for projection of tuples */
	tstate = begin_tup_output_tupdesc(dest, tupdesc);

	/* Send it */
4348
	do_text_output_oneline(tstate, value);
4349 4350

	end_tup_output(tstate);
4351 4352
}

4353 4354 4355
/*
 * SHOW ALL command
 */
4356
static void
4357
ShowAllGUCConfig(DestReceiver *dest)
4358
{
4359
	bool		am_superuser = superuser();
4360
	int			i;
4361
	TupOutputState *tstate;
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	TupleDesc	tupdesc;
	char	   *values[2];
4364 4365

	/* need a tuple descriptor representing two TEXT columns */
4366
	tupdesc = CreateTemplateTupleDesc(2, false);
4367
	TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
4368
					   TEXTOID, -1, 0);
4369
	TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
4370
					   TEXTOID, -1, 0);
4371 4372 4373

	/* prepare for projection of tuples */
	tstate = begin_tup_output_tupdesc(dest, tupdesc);
4374

4375 4376
	for (i = 0; i < num_guc_variables; i++)
	{
4377 4378
		struct config_generic *conf = guc_variables[i];

4379 4380
		if ((conf->flags & GUC_NO_SHOW_ALL) ||
			((conf->flags & GUC_SUPERUSER_ONLY) && !am_superuser))
4381
			continue;
4382 4383

		/* assign to the values array */
4384 4385
		values[0] = (char *) conf->name;
		values[1] = _ShowOption(conf);
4386 4387 4388

		/* send it to dest */
		do_tup_output(tstate, values);
4389

4390 4391 4392
		/* clean up */
		if (values[1] != NULL)
			pfree(values[1]);
4393
	}
4394 4395

	end_tup_output(tstate);
4396
}
4397

4398
/*
4399 4400
 * Return GUC variable value by name; optionally return canonical
 * form of name.  Return value is palloc'd.
4401 4402
 */
char *
4403
GetConfigOptionByName(const char *name, const char **varname)
4404 4405 4406
{
	struct config_generic *record;

4407
	record = find_option(name, ERROR);
4408
	if (record == NULL)
4409 4410
		ereport(ERROR,
				(errcode(ERRCODE_UNDEFINED_OBJECT),
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		   errmsg("unrecognized configuration parameter \"%s\"", name)));
4412 4413 4414 4415
	if ((record->flags & GUC_SUPERUSER_ONLY) && !superuser())
		ereport(ERROR,
				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
				 errmsg("must be superuser to examine \"%s\"", name)));
4416

4417 4418 4419
	if (varname)
		*varname = record->name;

4420 4421 4422 4423
	return _ShowOption(record);
}

/*
4424 4425
 * Return GUC variable value by variable number; optionally return canonical
 * form of name.  Return value is palloc'd.
4426
 */
4427 4428
void
GetConfigOptionByNum(int varnum, const char **values, bool *noshow)
4429
{
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	char		buffer[256];
	struct config_generic *conf;
4432 4433 4434 4435 4436

	/* check requested variable number valid */
	Assert((varnum >= 0) && (varnum < num_guc_variables));

	conf = guc_variables[varnum];
4437

4438
	if (noshow)
4439 4440 4441 4442 4443 4444 4445
	{
		if ((conf->flags & GUC_NO_SHOW_ALL) ||
			((conf->flags & GUC_SUPERUSER_ONLY) && !superuser()))
			*noshow = true;
		else
			*noshow = false;
	}
4446

4447 4448 4449 4450 4451 4452 4453 4454
	/* first get the generic attributes */

	/* name */
	values[0] = conf->name;

	/* setting : use _ShowOption in order to avoid duplicating the logic */
	values[1] = _ShowOption(conf);

4455 4456 4457 4458 4459 4460 4461 4462 4463
	/* group */
	values[2] = config_group_names[conf->group];

	/* short_desc */
	values[3] = conf->short_desc;

	/* extra_desc */
	values[4] = conf->long_desc;

4464
	/* context */
4465
	values[5] = GucContext_Names[conf->context];
4466 4467

	/* vartype */
4468
	values[6] = config_type_names[conf->vartype];
4469 4470

	/* source */
4471
	values[7] = GucSource_Names[conf->source];
4472 4473 4474 4475 4476 4477 4478

	/* now get the type specifc attributes */
	switch (conf->vartype)
	{
		case PGC_BOOL:
			{
				/* min_val */
4479
				values[8] = NULL;
4480 4481

				/* max_val */
4482
				values[9] = NULL;
4483 4484 4485 4486 4487 4488 4489 4490 4491
			}
			break;

		case PGC_INT:
			{
				struct config_int *lconf = (struct config_int *) conf;

				/* min_val */
				snprintf(buffer, sizeof(buffer), "%d", lconf->min);
4492
				values[8] = pstrdup(buffer);
4493 4494 4495

				/* max_val */
				snprintf(buffer, sizeof(buffer), "%d", lconf->max);
4496
				values[9] = pstrdup(buffer);
4497 4498 4499 4500 4501 4502 4503 4504 4505
			}
			break;

		case PGC_REAL:
			{
				struct config_real *lconf = (struct config_real *) conf;

				/* min_val */
				snprintf(buffer, sizeof(buffer), "%g", lconf->min);
4506
				values[8] = pstrdup(buffer);
4507 4508 4509

				/* max_val */
				snprintf(buffer, sizeof(buffer), "%g", lconf->max);
4510
				values[9] = pstrdup(buffer);
4511 4512 4513 4514 4515 4516
			}
			break;

		case PGC_STRING:
			{
				/* min_val */
4517
				values[8] = NULL;
4518 4519

				/* max_val */
4520
				values[9] = NULL;
4521 4522 4523 4524 4525 4526
			}
			break;

		default:
			{
				/*
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				 * should never get here, but in case we do, set 'em to
				 * NULL
4529 4530 4531
				 */

				/* min_val */
4532
				values[8] = NULL;
4533 4534

				/* max_val */
4535
				values[9] = NULL;
4536 4537 4538
			}
			break;
	}
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}

/*
 * Return the total number of GUC variables
 */
int
GetNumConfigOptions(void)
{
	return num_guc_variables;
}

/*
 * show_config_by_name - equiv to SHOW X command but implemented as
 * a function.
 */
Datum
show_config_by_name(PG_FUNCTION_ARGS)
{
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	char	   *varname;
	char	   *varval;
	text	   *result_text;
4560 4561

	/* Get the GUC variable name */
4562
	varname = DatumGetCString(DirectFunctionCall1(textout, PG_GETARG_DATUM(0)));
4563 4564

	/* Get the value */
4565
	varval = GetConfigOptionByName(varname, NULL);
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	/* Convert to text */
	result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(varval)));

	/* return it */
	PG_RETURN_TEXT_P(result_text);
}

4574 4575 4576 4577
/*
 * show_all_settings - equiv to SHOW ALL command but implemented as
 * a Table Function.
 */
4578
#define NUM_PG_SETTINGS_ATTS	10
4579

4580 4581 4582
Datum
show_all_settings(PG_FUNCTION_ARGS)
{
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	FuncCallContext *funcctx;
	TupleDesc	tupdesc;
	int			call_cntr;
	int			max_calls;
	AttInMetadata *attinmeta;
	MemoryContext oldcontext;
4589 4590

	/* stuff done only on the first call of the function */
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	if (SRF_IS_FIRSTCALL())
	{
4593
		/* create a function context for cross-call persistence */
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		funcctx = SRF_FIRSTCALL_INIT();
4595

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		/*
		 * switch to memory context appropriate for multiple function
		 * calls
		 */
4600 4601
		oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);

4602
		/*
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		 * need a tuple descriptor representing NUM_PG_SETTINGS_ATTS
		 * columns of the appropriate types
4605 4606
		 */
		tupdesc = CreateTemplateTupleDesc(NUM_PG_SETTINGS_ATTS, false);
4607
		TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
4608
						   TEXTOID, -1, 0);
4609
		TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
4610
						   TEXTOID, -1, 0);
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		TupleDescInitEntry(tupdesc, (AttrNumber) 3, "category",
4612
						   TEXTOID, -1, 0);
4613
		TupleDescInitEntry(tupdesc, (AttrNumber) 4, "short_desc",
4614
						   TEXTOID, -1, 0);
4615
		TupleDescInitEntry(tupdesc, (AttrNumber) 5, "extra_desc",
4616
						   TEXTOID, -1, 0);
4617
		TupleDescInitEntry(tupdesc, (AttrNumber) 6, "context",
4618
						   TEXTOID, -1, 0);
4619
		TupleDescInitEntry(tupdesc, (AttrNumber) 7, "vartype",
4620
						   TEXTOID, -1, 0);
4621
		TupleDescInitEntry(tupdesc, (AttrNumber) 8, "source",
4622
						   TEXTOID, -1, 0);
4623
		TupleDescInitEntry(tupdesc, (AttrNumber) 9, "min_val",
4624
						   TEXTOID, -1, 0);
4625
		TupleDescInitEntry(tupdesc, (AttrNumber) 10, "max_val",
4626
						   TEXTOID, -1, 0);
4627 4628

		/*
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		 * Generate attribute metadata needed later to produce tuples from
		 * raw C strings
4631 4632 4633 4634 4635 4636
		 */
		attinmeta = TupleDescGetAttInMetadata(tupdesc);
		funcctx->attinmeta = attinmeta;

		/* total number of tuples to be returned */
		funcctx->max_calls = GetNumConfigOptions();
4637 4638

		MemoryContextSwitchTo(oldcontext);
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4639
	}
4640 4641

	/* stuff done on every call of the function */
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	funcctx = SRF_PERCALL_SETUP();
4643 4644 4645 4646 4647

	call_cntr = funcctx->call_cntr;
	max_calls = funcctx->max_calls;
	attinmeta = funcctx->attinmeta;

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	if (call_cntr < max_calls)	/* do when there is more left to send */
	{
4650
		char	   *values[NUM_PG_SETTINGS_ATTS];
4651 4652 4653 4654 4655 4656 4657 4658 4659
		bool		noshow;
		HeapTuple	tuple;
		Datum		result;

		/*
		 * Get the next visible GUC variable name and value
		 */
		do
		{
4660
			GetConfigOptionByNum(call_cntr, (const char **) values, &noshow);
4661 4662 4663 4664 4665 4666 4667
			if (noshow)
			{
				/* bump the counter and get the next config setting */
				call_cntr = ++funcctx->call_cntr;

				/* make sure we haven't gone too far now */
				if (call_cntr >= max_calls)
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					SRF_RETURN_DONE(funcctx);
4669 4670 4671 4672 4673 4674 4675
			}
		} while (noshow);

		/* build a tuple */
		tuple = BuildTupleFromCStrings(attinmeta, values);

		/* make the tuple into a datum */
4676
		result = HeapTupleGetDatum(tuple);
4677

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		SRF_RETURN_NEXT(funcctx, result);
	}
	else
4681 4682
	{
		/* do when there is no more left */
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		SRF_RETURN_DONE(funcctx);
4684
	}
4685 4686
}

4687
static char *
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_ShowOption(struct config_generic * record)
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{
	char		buffer[256];
	const char *val;
4692

4693 4694 4695 4696 4697
	switch (record->vartype)
	{
		case PGC_BOOL:
			{
				struct config_bool *conf = (struct config_bool *) record;
4698

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				if (conf->show_hook)
					val = (*conf->show_hook) ();
				else
					val = *conf->variable ? "on" : "off";
			}
			break;

		case PGC_INT:
			{
				struct config_int *conf = (struct config_int *) record;

				if (conf->show_hook)
					val = (*conf->show_hook) ();
				else
				{
					snprintf(buffer, sizeof(buffer), "%d",
							 *conf->variable);
					val = buffer;
				}
			}
			break;

		case PGC_REAL:
			{
				struct config_real *conf = (struct config_real *) record;

				if (conf->show_hook)
					val = (*conf->show_hook) ();
				else
				{
					snprintf(buffer, sizeof(buffer), "%g",
							 *conf->variable);
					val = buffer;
				}
			}
			break;

		case PGC_STRING:
			{
				struct config_string *conf = (struct config_string *) record;
4739

4740 4741 4742 4743 4744 4745 4746 4747
				if (conf->show_hook)
					val = (*conf->show_hook) ();
				else if (*conf->variable && **conf->variable)
					val = *conf->variable;
				else
					val = "unset";
			}
			break;
4748

4749 4750 4751 4752 4753
		default:
			/* just to keep compiler quiet */
			val = "???";
			break;
	}
4754

4755
	return pstrdup(val);
4756
}
4757 4758


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#ifdef EXEC_BACKEND
/*
 *	This routine dumps out all non-default GUC options into a binary
 *	file that is read by all exec'ed backends.  The format is:
 *
 *		variable name, string, null terminated
 *		variable value, string, null terminated
 *		variable source, integer
 */
void
write_nondefault_variables(GucContext context)
{
4771 4772 4773 4774 4775
	int			i;
	char	   *new_filename,
			   *filename;
	int			elevel;
	FILE	   *fp;
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	Assert(context == PGC_POSTMASTER || context == PGC_SIGHUP);
	Assert(DataDir);
4779 4780

	elevel = (context == PGC_SIGHUP) ? LOG : ERROR;
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	/*
	 * Open file
	 */
4785
	new_filename = guc_malloc(elevel, strlen(DataDir) + strlen(CONFIG_EXEC_PARAMS) +
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							  strlen(".new") + 2);
	if (new_filename == NULL)
4788 4789 4790 4791
		return;

	filename = guc_malloc(elevel, strlen(DataDir) + strlen(CONFIG_EXEC_PARAMS) + 2);
	if (filename == NULL)
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4792
	{
4793
		free(new_filename);
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		return;
	}
4796

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	sprintf(new_filename, "%s/" CONFIG_EXEC_PARAMS ".new", DataDir);
	sprintf(filename, "%s/" CONFIG_EXEC_PARAMS, DataDir);

4800 4801 4802 4803
	fp = AllocateFile(new_filename, "w");
	if (!fp)
	{
		free(new_filename);
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		free(filename);
4805 4806
		ereport(elevel,
				(errcode_for_file_access(),
4807
				 errmsg("could not write to file \"%s\": %m", CONFIG_EXEC_PARAMS)));
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		return;
	}

	for (i = 0; i < num_guc_variables; i++)
	{
		struct config_generic *gconf = guc_variables[i];

		if (gconf->source != PGC_S_DEFAULT)
		{
			fprintf(fp, "%s", gconf->name);
			fputc(0, fp);

			switch (gconf->vartype)
			{
				case PGC_BOOL:
					{
						struct config_bool *conf = (struct config_bool *) gconf;

						if (*conf->variable == 0)
							fprintf(fp, "false");
						else
							fprintf(fp, "true");
					}
					break;

				case PGC_INT:
					{
						struct config_int *conf = (struct config_int *) gconf;

						fprintf(fp, "%d", *conf->variable);
					}
					break;

				case PGC_REAL:
					{
						struct config_real *conf = (struct config_real *) gconf;

						/* Could lose precision here? */
						fprintf(fp, "%f", *conf->variable);
					}
					break;

				case PGC_STRING:
					{
						struct config_string *conf = (struct config_string *) gconf;

						fprintf(fp, "%s", *conf->variable);
					}
					break;
			}

			fputc(0, fp);

			fwrite(&gconf->source, sizeof(gconf->source), 1, fp);
		}
	}

4865 4866 4867 4868 4869 4870 4871 4872 4873 4874
	if (FreeFile(fp))
	{
		free(new_filename);
		free(filename);
		ereport(elevel,
				(errcode_for_file_access(),
				 errmsg("could not write to file \"%s\": %m", CONFIG_EXEC_PARAMS)));
		return;
	}

4875
	/*
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	 * Put new file in place.  This could delay on Win32, but we don't
	 * hold any exclusive locks.
4878
	 */
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	rename(new_filename, filename);
	free(new_filename);
	free(filename);
}


/*
 *	Read string, including null byte from file
 *
 *	Return NULL on EOF and nothing read
 */
static char *
read_string_with_null(FILE *fp)
{
4893 4894 4895 4896
	int			i = 0,
				ch,
				maxlen = 256;
	char	   *str = NULL;
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	do
	{
		if ((ch = fgetc(fp)) == EOF)
		{
			if (i == 0)
				return NULL;
			else
4905
				elog(FATAL, "invalid format of exec config params file");
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		}
		if (i == 0)
4908
			str = guc_malloc(FATAL, maxlen);
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		else if (i == maxlen)
4910
			str = guc_realloc(FATAL, str, maxlen *= 2);
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		str[i++] = ch;
	} while (ch != 0);

	return str;
}


/*
 *	This routine loads a previous postmaster dump of its non-default
 *	settings.
 */
void
read_nondefault_variables(void)
{
4925 4926 4927 4928 4929
	char	   *filename;
	FILE	   *fp;
	char	   *varname,
			   *varvalue;
	int			varsource;
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	Assert(DataDir);

	/*
	 * Open file
	 */
4936
	filename = guc_malloc(FATAL, strlen(DataDir) + strlen(CONFIG_EXEC_PARAMS) + 2);
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	sprintf(filename, "%s/" CONFIG_EXEC_PARAMS, DataDir);

4939 4940 4941
	fp = AllocateFile(filename, "r");
	if (!fp)
	{
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4942
		free(filename);
4943 4944
		/* File not found is fine */
		if (errno != ENOENT)
4945 4946
			ereport(FATAL,
					(errcode_for_file_access(),
4947
					 errmsg("could not read from file \"%s\": %m", CONFIG_EXEC_PARAMS)));
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4948
		return;
4949
	}
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4950

4951
	for (;;)
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	{
4953 4954
		struct config_generic *record;

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		if ((varname = read_string_with_null(fp)) == NULL)
			break;

4958
		if ((record = find_option(varname, FATAL)) == NULL)
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4959
			elog(FATAL, "failed to locate variable %s in exec config params file", varname);
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4960
		if ((varvalue = read_string_with_null(fp)) == NULL)
4961
			elog(FATAL, "invalid format of exec config params file");
4962
		if (fread(&varsource, sizeof(varsource), 1, fp) == 0)
4963
			elog(FATAL, "invalid format of exec config params file");
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4965
		(void) set_config_option(varname, varvalue, record->context,
4966
								 varsource, false, true);
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		free(varname);
		free(varvalue);
	}

	FreeFile(fp);
	free(filename);
	return;
}
#endif


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/*
 * A little "long argument" simulation, although not quite GNU
 * compliant. Takes a string of the form "some-option=some value" and
 * returns name = "some_option" and value = "some value" in malloc'ed
 * storage. Note that '-' is converted to '_' in the option name. If
 * there is no '=' in the input string then value will be NULL.
 */
void
4986
ParseLongOption(const char *string, char **name, char **value)
4987
{
4988 4989
	size_t		equal_pos;
	char	   *cp;
4990 4991 4992 4993 4994 4995 4996 4997 4998

	AssertArg(string);
	AssertArg(name);
	AssertArg(value);

	equal_pos = strcspn(string, "=");

	if (string[equal_pos] == '=')
	{
4999
		*name = guc_malloc(FATAL, equal_pos + 1);
5000 5001 5002
		strncpy(*name, string, equal_pos);
		(*name)[equal_pos] = '\0';

5003
		*value = guc_strdup(FATAL, &string[equal_pos + 1]);
5004
	}
5005
	else
5006
	{
5007
		/* no equal sign in string */
5008
		*name = guc_strdup(FATAL, string);
5009 5010 5011
		*value = NULL;
	}

5012
	for (cp = *name; *cp; cp++)
5013 5014 5015
		if (*cp == '-')
			*cp = '_';
}
5016 5017


5018 5019
/*
 * Handle options fetched from pg_database.datconfig or pg_shadow.useconfig.
5020
 * The array parameter must be an array of TEXT (it must not be NULL).
5021
 */
5022 5023 5024
void
ProcessGUCArray(ArrayType *array, GucSource source)
{
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	int			i;
5026

5027
	Assert(array != NULL);
5028 5029 5030
	Assert(ARR_ELEMTYPE(array) == TEXTOID);
	Assert(ARR_NDIM(array) == 1);
	Assert(ARR_LBOUND(array)[0] == 1);
5031
	Assert(source == PGC_S_DATABASE || source == PGC_S_USER);
5032 5033 5034 5035 5036 5037 5038 5039 5040 5041

	for (i = 1; i <= ARR_DIMS(array)[0]; i++)
	{
		Datum		d;
		bool		isnull;
		char	   *s;
		char	   *name;
		char	   *value;

		d = array_ref(array, 1, &i,
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					  -1 /* varlenarray */ ,
					  -1 /* TEXT's typlen */ ,
					  false /* TEXT's typbyval */ ,
					  'i' /* TEXT's typalign */ ,
5046 5047 5048 5049 5050 5051
					  &isnull);

		if (isnull)
			continue;

		s = DatumGetCString(DirectFunctionCall1(textout, d));
5052

5053 5054 5055
		ParseLongOption(s, &name, &value);
		if (!value)
		{
5056 5057
			ereport(WARNING,
					(errcode(ERRCODE_SYNTAX_ERROR),
5058
					 errmsg("could not parse setting for parameter \"%s\"", name)));
5059
			free(name);
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5060
			continue;
5061 5062
		}

5063
		/*
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		 * We process all these options at SUSET level.  We assume that
		 * the right to insert an option into pg_database or pg_shadow was
5066 5067
		 * checked when it was inserted.
		 */
5068
		SetConfigOption(name, value, PGC_SUSET, source);
5069 5070 5071 5072

		free(name);
		if (value)
			free(value);
5073 5074 5075 5076
	}
}


5077 5078 5079 5080
/*
 * Add an entry to an option array.  The array parameter may be NULL
 * to indicate the current table entry is NULL.
 */
5081 5082 5083
ArrayType *
GUCArrayAdd(ArrayType *array, const char *name, const char *value)
{
5084
	const char *varname;
5085 5086 5087 5088 5089 5090 5091 5092 5093 5094
	Datum		datum;
	char	   *newval;
	ArrayType  *a;

	Assert(name);
	Assert(value);

	/* test if the option is valid */
	set_config_option(name, value,
					  superuser() ? PGC_SUSET : PGC_USERSET,
5095
					  PGC_S_TEST, false, false);
5096

5097 5098 5099 5100
	/* convert name to canonical spelling, so we can use plain strcmp */
	(void) GetConfigOptionByName(name, &varname);
	name = varname;

5101 5102 5103
	newval = palloc(strlen(name) + 1 + strlen(value) + 1);
	sprintf(newval, "%s=%s", name, value);
	datum = DirectFunctionCall1(textin, CStringGetDatum(newval));
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5104

5105 5106
	if (array)
	{
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		int			index;
		bool		isnull;
		int			i;
5110

5111 5112 5113 5114
		Assert(ARR_ELEMTYPE(array) == TEXTOID);
		Assert(ARR_NDIM(array) == 1);
		Assert(ARR_LBOUND(array)[0] == 1);

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		index = ARR_DIMS(array)[0] + 1; /* add after end */
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		for (i = 1; i <= ARR_DIMS(array)[0]; i++)
		{
			Datum		d;
			char	   *current;

			d = array_ref(array, 1, &i,
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						  -1 /* varlenarray */ ,
						  -1 /* TEXT's typlen */ ,
						  false /* TEXT's typbyval */ ,
						  'i' /* TEXT's typalign */ ,
5127
						  &isnull);
5128 5129
			if (isnull)
				continue;
5130
			current = DatumGetCString(DirectFunctionCall1(textout, d));
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			if (strncmp(current, newval, strlen(name) + 1) == 0)
5132 5133 5134 5135 5136 5137 5138
			{
				index = i;
				break;
			}
		}

		isnull = false;
5139 5140
		a = array_set(array, 1, &index,
					  datum,
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					  -1 /* varlenarray */ ,
					  -1 /* TEXT's typlen */ ,
					  false /* TEXT's typbyval */ ,
					  'i' /* TEXT's typalign */ ,
5145
					  &isnull);
5146 5147
	}
	else
5148 5149 5150
		a = construct_array(&datum, 1,
							TEXTOID,
							-1, false, 'i');
5151 5152 5153 5154 5155

	return a;
}


5156 5157 5158 5159 5160
/*
 * Delete an entry from an option array.  The array parameter may be NULL
 * to indicate the current table entry is NULL.  Also, if the return value
 * is NULL then a null should be stored.
 */
5161 5162 5163
ArrayType *
GUCArrayDelete(ArrayType *array, const char *name)
{
5164
	const char *varname;
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5165 5166 5167
	ArrayType  *newarray;
	int			i;
	int			index;
5168 5169 5170 5171 5172 5173

	Assert(name);

	/* test if the option is valid */
	set_config_option(name, NULL,
					  superuser() ? PGC_SUSET : PGC_USERSET,
5174
					  PGC_S_TEST, false, false);
5175

5176 5177 5178 5179
	/* convert name to canonical spelling, so we can use plain strcmp */
	(void) GetConfigOptionByName(name, &varname);
	name = varname;

5180 5181 5182 5183 5184
	/* if array is currently null, then surely nothing to delete */
	if (!array)
		return NULL;

	newarray = NULL;
5185 5186 5187 5188 5189 5190 5191 5192 5193
	index = 1;

	for (i = 1; i <= ARR_DIMS(array)[0]; i++)
	{
		Datum		d;
		char	   *val;
		bool		isnull;

		d = array_ref(array, 1, &i,
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					  -1 /* varlenarray */ ,
					  -1 /* TEXT's typlen */ ,
					  false /* TEXT's typbyval */ ,
					  'i' /* TEXT's typalign */ ,
5198
					  &isnull);
5199 5200
		if (isnull)
			continue;
5201 5202
		val = DatumGetCString(DirectFunctionCall1(textout, d));

5203
		/* ignore entry if it's what we want to delete */
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5204
		if (strncmp(val, name, strlen(name)) == 0
5205 5206 5207
			&& val[strlen(name)] == '=')
			continue;

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		/* else add it to the output array */
		if (newarray)
		{
			isnull = false;
			newarray = array_set(newarray, 1, &index,
								 d,
								 -1 /* varlenarray */ ,
								 -1 /* TEXT's typlen */ ,
								 false /* TEXT's typbyval */ ,
								 'i' /* TEXT's typalign */ ,
								 &isnull);
		}
		else
			newarray = construct_array(&d, 1,
									   TEXTOID,
									   -1, false, 'i');

5225 5226 5227 5228 5229
		index++;
	}

	return newarray;
}
5230

5231 5232 5233 5234 5235

/*
 * assign_hook subroutines
 */

5236 5237 5238
static const char *
assign_log_destination(const char *value, bool doit, GucSource source)
{
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	char	   *rawstring;
	List	   *elemlist;
	ListCell   *l;
	int			newlogdest = 0;

5244 5245 5246 5247
	/* Need a modifiable copy of string */
	rawstring = pstrdup(value);

	/* Parse string into list of identifiers */
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5248
	if (!SplitIdentifierString(rawstring, ',', &elemlist))
5249 5250 5251
	{
		/* syntax error in list */
		pfree(rawstring);
5252
		list_free(elemlist);
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		if (source >= PGC_S_INTERACTIVE)
			ereport(ERROR,
					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
					 errmsg("invalid list syntax for parameter \"log_destination\"")));
		return NULL;
	}

	foreach(l, elemlist)
	{
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		char	   *tok = (char *) lfirst(l);

		if (pg_strcasecmp(tok, "stderr") == 0)
5265 5266
			newlogdest |= LOG_DESTINATION_STDERR;
#ifdef HAVE_SYSLOG
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		else if (pg_strcasecmp(tok, "syslog") == 0)
5268 5269 5270
			newlogdest |= LOG_DESTINATION_SYSLOG;
#endif
#ifdef WIN32
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		else if (pg_strcasecmp(tok, "eventlog") == 0)
5272 5273
			newlogdest |= LOG_DESTINATION_EVENTLOG;
#endif
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		else
		{
5276 5277 5278
			if (source >= PGC_S_INTERACTIVE)
				ereport(ERROR,
						(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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5279
						 errmsg("unrecognized \"log_destination\" key word: \"%s\"",
5280 5281
								tok)));
			pfree(rawstring);
5282
			list_free(elemlist);
5283 5284 5285 5286
			return NULL;
		}
	}

5287 5288 5289
	if (doit)
		Log_destination = newlogdest;

5290
	pfree(rawstring);
5291
	list_free(elemlist);
5292 5293 5294 5295

	return value;
}

5296 5297 5298
#ifdef HAVE_SYSLOG

static const char *
5299
assign_facility(const char *facility, bool doit, GucSource source)
5300
{
5301
	if (pg_strcasecmp(facility, "LOCAL0") == 0)
5302
		return facility;
5303
	if (pg_strcasecmp(facility, "LOCAL1") == 0)
5304
		return facility;
5305
	if (pg_strcasecmp(facility, "LOCAL2") == 0)
5306
		return facility;
5307
	if (pg_strcasecmp(facility, "LOCAL3") == 0)
5308
		return facility;
5309
	if (pg_strcasecmp(facility, "LOCAL4") == 0)
5310
		return facility;
5311
	if (pg_strcasecmp(facility, "LOCAL5") == 0)
5312
		return facility;
5313
	if (pg_strcasecmp(facility, "LOCAL6") == 0)
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		return facility;
5315
	if (pg_strcasecmp(facility, "LOCAL7") == 0)
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		return facility;
	return NULL;
}
#endif


static const char *
5323
assign_defaultxactisolevel(const char *newval, bool doit, GucSource source)
5324
{
5325
	if (pg_strcasecmp(newval, "serializable") == 0)
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	{
		if (doit)
			DefaultXactIsoLevel = XACT_SERIALIZABLE;
	}
5330
	else if (pg_strcasecmp(newval, "repeatable read") == 0)
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	{
		if (doit)
			DefaultXactIsoLevel = XACT_REPEATABLE_READ;
	}
5335
	else if (pg_strcasecmp(newval, "read committed") == 0)
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	{
		if (doit)
			DefaultXactIsoLevel = XACT_READ_COMMITTED;
	}
5340
	else if (pg_strcasecmp(newval, "read uncommitted") == 0)
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	{
		if (doit)
			DefaultXactIsoLevel = XACT_READ_UNCOMMITTED;
	}
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	else
		return NULL;
	return newval;
}

static const char *
5351
assign_log_min_messages(const char *newval,
5352
						bool doit, GucSource source)
5353
{
5354
	return (assign_msglvl(&log_min_messages, newval, doit, source));
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}

5357
static const char *
5358
assign_client_min_messages(const char *newval, bool doit, GucSource source)
5359
{
5360
	return (assign_msglvl(&client_min_messages, newval, doit, source));
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}

5363
static const char *
5364
assign_min_error_statement(const char *newval, bool doit, GucSource source)
5365
{
5366
	return (assign_msglvl(&log_min_error_statement, newval, doit, source));
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}

static const char *
5370
assign_msglvl(int *var, const char *newval, bool doit, GucSource source)
5371
{
5372
	if (pg_strcasecmp(newval, "debug") == 0)
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	{
		if (doit)
5375
			(*var) = DEBUG2;
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	}
5377
	else if (pg_strcasecmp(newval, "debug5") == 0)
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	{
		if (doit)
			(*var) = DEBUG5;
	}
5382
	else if (pg_strcasecmp(newval, "debug4") == 0)
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	{
		if (doit)
			(*var) = DEBUG4;
	}
5387
	else if (pg_strcasecmp(newval, "debug3") == 0)
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	{
		if (doit)
			(*var) = DEBUG3;
	}
5392
	else if (pg_strcasecmp(newval, "debug2") == 0)
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	{
		if (doit)
			(*var) = DEBUG2;
	}
5397
	else if (pg_strcasecmp(newval, "debug1") == 0)
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	{
		if (doit)
			(*var) = DEBUG1;
	}
5402
	else if (pg_strcasecmp(newval, "log") == 0)
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	{
		if (doit)
			(*var) = LOG;
	}
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5407

5408
	/*
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5409 5410
	 * Client_min_messages always prints 'info', but we allow it as a
	 * value anyway.
5411
	 */
5412
	else if (pg_strcasecmp(newval, "info") == 0)
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	{
		if (doit)
			(*var) = INFO;
	}
5417
	else if (pg_strcasecmp(newval, "notice") == 0)
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	{
		if (doit)
			(*var) = NOTICE;
	}
5422
	else if (pg_strcasecmp(newval, "warning") == 0)
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	{
		if (doit)
			(*var) = WARNING;
	}
5427
	else if (pg_strcasecmp(newval, "error") == 0)
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	{
		if (doit)
			(*var) = ERROR;
	}
5432
	/* We allow FATAL/PANIC for client-side messages too. */
5433
	else if (pg_strcasecmp(newval, "fatal") == 0)
5434 5435 5436 5437
	{
		if (doit)
			(*var) = FATAL;
	}
5438
	else if (pg_strcasecmp(newval, "panic") == 0)
5439 5440 5441 5442
	{
		if (doit)
			(*var) = PANIC;
	}
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	else
		return NULL;			/* fail */
	return newval;				/* OK */
}
5447

5448
static const char *
5449
assign_log_error_verbosity(const char *newval, bool doit, GucSource source)
5450
{
5451
	if (pg_strcasecmp(newval, "terse") == 0)
5452 5453 5454 5455
	{
		if (doit)
			Log_error_verbosity = PGERROR_TERSE;
	}
5456
	else if (pg_strcasecmp(newval, "default") == 0)
5457 5458 5459 5460
	{
		if (doit)
			Log_error_verbosity = PGERROR_DEFAULT;
	}
5461
	else if (pg_strcasecmp(newval, "verbose") == 0)
5462 5463 5464 5465 5466 5467 5468 5469 5470
	{
		if (doit)
			Log_error_verbosity = PGERROR_VERBOSE;
	}
	else
		return NULL;			/* fail */
	return newval;				/* OK */
}

5471 5472 5473
static const char *
assign_log_statement(const char *newval, bool doit, GucSource source)
{
5474
	if (pg_strcasecmp(newval, "none") == 0)
5475 5476
	{
		if (doit)
5477
			log_statement = LOGSTMT_NONE;
5478
	}
5479
	else if (pg_strcasecmp(newval, "ddl") == 0)
5480 5481
	{
		if (doit)
5482
			log_statement = LOGSTMT_DDL;
5483
	}
5484
	else if (pg_strcasecmp(newval, "mod") == 0)
5485 5486
	{
		if (doit)
5487
			log_statement = LOGSTMT_MOD;
5488
	}
5489
	else if (pg_strcasecmp(newval, "all") == 0)
5490 5491
	{
		if (doit)
5492
			log_statement = LOGSTMT_ALL;
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	}
	else
		return NULL;			/* fail */
	return newval;				/* OK */
}

5499
static bool
5500
assign_phony_autocommit(bool newval, bool doit, GucSource source)
5501 5502 5503
{
	if (!newval)
	{
5504
		if (doit && source >= PGC_S_INTERACTIVE)
5505 5506
			ereport(ERROR,
					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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5507
				errmsg("SET AUTOCOMMIT TO OFF is no longer supported")));
5508 5509 5510 5511 5512
		return false;
	}
	return true;
}

5513 5514 5515
static const char *
assign_custom_variable_classes(const char *newval, bool doit, GucSource source)
{
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5516 5517
	/*
	 * Check syntax. newval must be a comma separated list of identifiers.
5518 5519
	 * Whitespace is allowed but skipped.
	 */
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	bool		hasSpaceAfterToken = false;
5521
	const char *cp = newval;
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	int			symLen = 0;
	int			c;
5524 5525 5526
	StringInfoData buf;

	initStringInfo(&buf);
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5527
	while ((c = *cp++) != 0)
5528
	{
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5529
		if (isspace(c))
5530
		{
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5531
			if (symLen > 0)
5532 5533 5534 5535
				hasSpaceAfterToken = true;
			continue;
		}

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5536
		if (c == ',')
5537 5538
		{
			hasSpaceAfterToken = false;
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5539
			if (symLen > 0)
5540 5541 5542 5543 5544 5545 5546
			{
				symLen = 0;
				appendStringInfoChar(&buf, ',');
			}
			continue;
		}

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5547
		if (hasSpaceAfterToken || !isalnum(c))
5548
		{
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			/*
			 * Syntax error due to token following space after token or
			 * non alpha numeric character
5552
			 */
5553
			ereport(LOG,
5554
					(errcode(ERRCODE_SYNTAX_ERROR),
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Peter Eisentraut committed
5555
					 errmsg("invalid syntax for \"custom_variable_classes\": \"%s\"", newval)));
5556
			pfree(buf.data);
5557 5558 5559
			return NULL;
		}
		symLen++;
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5560
		appendStringInfoChar(&buf, (char) c);
5561 5562
	}

5563
	/* Remove stray ',' at end */
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5564
	if (symLen == 0 && buf.len > 0)
5565
		buf.data[--buf.len] = '\0';
5566

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5567
	if (buf.len == 0)
5568
		newval = NULL;
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5569
	else if (doit)
5570 5571 5572 5573 5574
		newval = strdup(buf.data);

	pfree(buf.data);
	return newval;
}
5575

5576 5577 5578
static bool
assign_stage_log_stats(bool newval, bool doit, GucSource source)
{
5579
	if (newval && log_statement_stats)
5580
	{
5581 5582 5583 5584
		if (source >= PGC_S_INTERACTIVE)
			ereport(ERROR,
					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
					 errmsg("cannot enable parameter when \"log_statement_stats\" is true")));
5585 5586
		/* source == PGC_S_OVERRIDE means do it anyway, eg at xact abort */
		else if (source != PGC_S_OVERRIDE)
5587
			return false;
5588 5589 5590 5591 5592 5593 5594
	}
	return true;
}

static bool
assign_log_stats(bool newval, bool doit, GucSource source)
{
5595 5596
	if (newval &&
		(log_parser_stats || log_planner_stats || log_executor_stats))
5597
	{
5598 5599 5600 5601 5602 5603
		if (source >= PGC_S_INTERACTIVE)
			ereport(ERROR,
					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
					 errmsg("cannot enable \"log_statement_stats\" when "
							"\"log_parser_stats\", \"log_planner_stats\", "
							"or \"log_executor_stats\" is true")));
5604 5605
		/* source == PGC_S_OVERRIDE means do it anyway, eg at xact abort */
		else if (source != PGC_S_OVERRIDE)
5606
			return false;
5607 5608 5609 5610
	}
	return true;
}

5611 5612 5613
static bool
assign_transaction_read_only(bool newval, bool doit, GucSource source)
{
5614 5615 5616 5617 5618 5619 5620
	/* Can't go to r/w mode inside a r/o transaction */
	if (newval == false && XactReadOnly && IsSubTransaction())
	{
		if (source >= PGC_S_INTERACTIVE)
			ereport(ERROR,
					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
					 errmsg("cannot set transaction read-write mode inside a read-only transaction")));
5621 5622 5623
		/* source == PGC_S_OVERRIDE means do it anyway, eg at xact abort */
		else if (source != PGC_S_OVERRIDE)
			return false;
5624
	}
5625 5626
	return true;
}
5627

5628 5629 5630 5631 5632
static const char *
assign_canonical_path(const char *newval, bool doit, GucSource source)
{
	if (doit)
	{
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		char	   *canon_val = guc_strdup(ERROR, newval);

5635 5636 5637 5638 5639 5640 5641
		canonicalize_path(canon_val);
		return canon_val;
	}
	else
		return newval;
}

5642

5643
#include "guc-file.c"