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/*-------------------------------------------------------------------------
 *
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 * postgres.c
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 *	  POSTGRES C Backend Interface
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 *
 * Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
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 *	  $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.103 1999/02/18 06:00:49 momjian Exp $
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 *
 * NOTES
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 *	  this is the "main" module of the postgres backend and
 *	  hence the main module of the "traffic cop".
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 *
 *-------------------------------------------------------------------------
 */
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#include <unistd.h>
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#include <stdio.h>
#include <string.h>
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#include <signal.h>
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#include <time.h>
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#include <setjmp.h>
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#include <sys/time.h>
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#include <sys/types.h>
#include <fcntl.h>
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#include <sys/param.h>			/* for MAXHOSTNAMELEN on most */
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#ifndef MAXHOSTNAMELEN
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#include <netdb.h>				/* for MAXHOSTNAMELEN on some */
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#endif
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#ifndef MAXHOSTNAMELEN			/* for MAXHOSTNAMELEN under sco3.2v5.0.2 */
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#include <sys/socket.h>
#endif
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#include <errno.h>
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#if HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif	 /* aix */
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#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
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#ifdef __CYGWIN32__
#include <getopt.h>
#endif
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#include "postgres.h"
#include "miscadmin.h"
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#include "fmgr.h"
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#include "access/xact.h"
#include "catalog/catname.h"
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#include "commands/async.h"
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#include "executor/execdebug.h"
#include "executor/executor.h"
#include "libpq/libpq.h"
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#include "libpq/libpq-be.h"
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#include "libpq/pqsignal.h"
#include "nodes/pg_list.h"
#include "nodes/print.h"
#include "optimizer/cost.h"
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#include "optimizer/planner.h"
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#include "optimizer/prep.h"
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#include "parser/parser.h"
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#include "rewrite/rewriteHandler.h"		/* for QueryRewrite() */
#include "storage/bufmgr.h"
#include "tcop/dest.h"
#include "tcop/fastpath.h"
#include "tcop/pquery.h"
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#include "tcop/tcopdebug.h"
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#include "tcop/tcopprot.h"		/* where declarations for this file go */
#include "tcop/utility.h"
#include "utils/mcxt.h"
#include "utils/rel.h"
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#include "utils/ps_status.h"
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#include "utils/temprel.h"
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#if FALSE
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#include "nodes/relation.h"
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#endif
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#if 0
#include "optimizer/xfunc.h"
#endif
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#if FALSE
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#include "nodes/plannodes.h"
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#endif
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#if FALSE
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#include "nodes/memnodes.h"
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#endif
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#include "utils/trace.h"

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#ifdef MULTIBYTE
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#include "mb/pg_wchar.h"
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#endif

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/*
 * Trace flags, see backend/utils/misc/trace.c
 */
#define Verbose				pg_options[TRACE_VERBOSE]
#define DebugPrintQuery		pg_options[TRACE_QUERY]
#define DebugPrintPlan		pg_options[TRACE_PLAN]
#define DebugPrintParse		pg_options[TRACE_PARSE]
#define ShowParserStats		pg_options[TRACE_PARSERSTATS]
#define ShowPlannerStats	pg_options[TRACE_PLANNERSTATS]
#define ShowExecutorStats	pg_options[TRACE_EXECUTORSTATS]
#define DebugPrintRewrittenParsetree \
							pg_options[TRACE_REWRITTEN]
#ifdef LOCK_MGR_DEBUG
#define LockDebug			pg_options[TRACE_LOCKS]
#endif

#define DeadlockCheckTimer	pg_options[OPT_DEADLOCKTIMEOUT]
#define HostnameLookup		pg_options[OPT_HOSTLOOKUP]
#define ShowPortNumber		pg_options[OPT_SHOWPORTNUMBER]

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/* ----------------
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 *		global variables
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 * ----------------
 */
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/*static bool	EnableRewrite = true; , never changes why have it*/
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CommandDest whereToSendOutput;
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/* Define status buffer needed by PS_SET_STATUS */
PS_DEFINE_BUFFER;
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extern int	lockingOff;
extern int	NBuffers;
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int			dontExecute = 0;
static int	ShowStats;
static bool IsEmptyQuery = false;
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char		relname[80];		/* current relation name */
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#if defined(nextstep)
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jmp_buf		Warn_restart;
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#define sigsetjmp(x,y)	setjmp(x)
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#define siglongjmp longjmp
#else
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sigjmp_buf	Warn_restart;
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#endif	 /* defined(nextstep) */
bool		InError;
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extern int	NBuffers;
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static int	EchoQuery = 0;		/* default don't echo */
time_t		tim;
char		pg_pathname[256];
FILE	   *StatFp;
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/* ----------------
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 *		people who want to use EOF should #define DONTUSENEWLINE in
 *		tcop/tcopdebug.h
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 * ----------------
 */
#ifndef TCOP_DONTUSENEWLINE
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int			UseNewLine = 1;		/* Use newlines query delimiters (the
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								 * default) */

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#else
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int			UseNewLine = 0;		/* Use EOF as query delimiters */
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#endif	 /* TCOP_DONTUSENEWLINE */
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/*
** Flags for expensive function optimization -- JMH 3/9/92
*/
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int			XfuncMode = 0;
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/*
 * ----------------
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 *	 Note: _exec_repeat_ defaults to 1 but may be changed
 *		   by a DEBUG command.	 If you set this to a large
 *		   number N, run a single query, and then set it
 *		   back to 1 and run N queries, you can get an idea
 *		   of how much time is being spent in the parser and
 *		   planner b/c in the first case this overhead only
 *		   happens once.  -cim 6/9/91
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 * ----------------
*/
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int			_exec_repeat_ = 1;
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/* ----------------------------------------------------------------
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 *		decls for routines only used in this file
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 * ----------------------------------------------------------------
 */
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static char InteractiveBackend(char *inBuf);
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static char SocketBackend(char *inBuf);
static char ReadCommand(char *inBuf);
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/* ----------------------------------------------------------------
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 *		routines to obtain user input
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 * ----------------------------------------------------------------
 */

/* ----------------
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 *	InteractiveBackend() is called for user interactive connections
 *	the string entered by the user is placed in its parameter inBuf.
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 * ----------------
 */

static char
InteractiveBackend(char *inBuf)
{
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	char	   *stuff = inBuf;	/* current place in input buffer */
	int			c;				/* character read from getc() */
	bool		end = false;	/* end-of-input flag */
	bool		backslashSeen = false;	/* have we seen a \ ? */
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	/* ----------------
	 *	display a prompt and obtain input from the user
	 * ----------------
	 */
	printf("> ");
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	fflush(stdout);
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	for (;;)
	{
		if (UseNewLine)
		{
			/* ----------------
			 *	if we are using \n as a delimiter, then read
			 *	characters until the \n.
			 * ----------------
			 */
			while ((c = getc(stdin)) != EOF)
			{
				if (c == '\n')
				{
					if (backslashSeen)
					{
						stuff--;
						continue;
					}
					else
					{
						/* keep the newline character */
						*stuff++ = '\n';
						*stuff++ = '\0';
						break;
					}
				}
				else if (c == '\\')
					backslashSeen = true;
				else
					backslashSeen = false;

				*stuff++ = (char) c;
			}

			if (c == EOF)
				end = true;
		}
		else
		{
			/* ----------------
			 *	otherwise read characters until EOF.
			 * ----------------
			 */
			while ((c = getc(stdin)) != EOF)
				*stuff++ = (char) c;

			if (stuff == inBuf)
				end = true;
		}

		if (end)
		{
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			if (Verbose)
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				puts("EOF");
			IsEmptyQuery = true;
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			proc_exit(0);
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		}

		/* ----------------
		 *	otherwise we have a user query so process it.
		 * ----------------
		 */
		break;
	}

	/* ----------------
	 *	if the query echo flag was given, print the query..
	 * ----------------
	 */
	if (EchoQuery)
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		printf("query: %s\n", inBuf);
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	fflush(stdout);
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	return 'Q';
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}

/* ----------------
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 *	SocketBackend()		Is called for frontend-backend connections
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 *
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 *	If the input is a query (case 'Q') then the string entered by
 *	the user is placed in its parameter inBuf.
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 *
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 *	If the input is a fastpath function call (case 'F') then
 *	the function call is processed in HandleFunctionRequest().
 *	(now called from PostgresMain())
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 * ----------------
 */

static char
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SocketBackend(char *inBuf)
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{
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	char		qtype[2];
	char		result = '\0';
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	/* ----------------
	 *	get input from the frontend
	 * ----------------
	 */
	strcpy(qtype, "?");
	if (pq_getnchar(qtype, 0, 1) == EOF)
	{
		/* ------------
		 *	when front-end applications quits/dies
		 * ------------
		 */
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		proc_exit(0);
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	}

	switch (*qtype)
	{
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			/* ----------------
			 *	'Q': user entered a query
			 * ----------------
			 */
		case 'Q':
			pq_getstr(inBuf, MAX_PARSE_BUFFER);
			result = 'Q';
			break;
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			/* ----------------
			 *	'F':  calling user/system functions
			 * ----------------
			 */
		case 'F':
			pq_getstr(inBuf, MAX_PARSE_BUFFER); /* ignore the rest of the
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												 * line */
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			result = 'F';
			break;
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			/* ----------------
			 *	'X':  frontend is exiting
			 * ----------------
			 */
		case 'X':
			result = 'X';
			break;
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			/* ----------------
			 *	otherwise we got garbage from the frontend.
			 *
			 *	XXX are we certain that we want to do an elog(FATAL) here?
			 *		-cim 1/24/90
			 * ----------------
			 */
		default:
			elog(FATAL, "Socket command type %c unknown\n", *qtype);
			break;
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	}
	return result;
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}

/* ----------------
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 *		ReadCommand reads a command from either the frontend or
 *		standard input, places it in inBuf, and returns a char
 *		representing whether the string is a 'Q'uery or a 'F'astpath
 *		call.
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 * ----------------
 */
static char
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ReadCommand(char *inBuf)
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{
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	if (IsUnderPostmaster)
		return SocketBackend(inBuf);
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	else
		return InteractiveBackend(inBuf);
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}

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List *
pg_parse_and_plan(char *query_string,	/* string to execute */
				  Oid *typev,	/* argument types */
				  int nargs,	/* number of arguments */
				  QueryTreeList **queryListP,	/* pointer to the parse
												 * trees */
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				  CommandDest dest,		/* where results should go */
				  bool aclOverride)
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{
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	QueryTreeList *querytree_list;
	int			i;
	List	   *plan_list = NIL;
	Plan	   *plan;
	int			j;
	QueryTreeList *new_list;
	List	   *rewritten = NIL;
	Query	   *querytree;
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	/* ----------------
	 *	(1) parse the request string into a list of parse trees
	 * ----------------
	 */
	if (ShowParserStats)
		ResetUsage();

	querytree_list = parser(query_string, typev, nargs);

	if (ShowParserStats)
	{
		fprintf(stderr, "! Parser Stats:\n");
		ShowUsage();
	}

	/* new_list holds the rewritten queries */
	new_list = (QueryTreeList *) malloc(sizeof(QueryTreeList));
	new_list->len = querytree_list->len;
	new_list->qtrees = (Query **) malloc(new_list->len * sizeof(Query *));

	/* ----------------
	 *	(2) rewrite the queries, as necessary
	 * ----------------
	 */
	j = 0;						/* counter for the new_list, new_list can
								 * be longer than old list as a result of
								 * rewrites */
	for (i = 0; i < querytree_list->len; i++)
	{
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		List	   *union_result,
				   *union_list,
				   *rewritten_list;

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		querytree = querytree_list->qtrees[i];

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 		/***S*I***/
 		/* Rewrite Union, Intersect and Except Queries
 		 * to normal Union Queries using IN and NOT IN subselects */
 		if(querytree->intersectClause != NIL) 
 		  {	  
 		    querytree = Except_Intersect_Rewrite(querytree);
 		  }

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		if (DebugPrintQuery)
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		{
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			if (DebugPrintQuery > 3)
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			{			  
			  /* Print the query string as is if query debug level > 3 */
			  TPRINTF(TRACE_QUERY, "query: %s", query_string); 
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			}
			else
			{
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				/* Print condensed query string to fit in one log line */
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				char		buff[8192 + 1];
				char		c,
						   *s,
						   *d;
				int			n,
							is_space = 1;

				for (s = query_string, d = buff, n = 0; (c = *s) && (n < 8192); s++)
				{
					switch (c)
					{
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						case '\r':
						case '\n':
						case '\t':
							c = ' ';
							/* fall through */
						case ' ':
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							if (is_space)
								continue;
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							is_space = 1;
							break;
						default:
							is_space = 0;
							break;
					}
					*d++ = c;
					n++;
				}
				*d = '\0';
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				TPRINTF(TRACE_QUERY, "query: %s", buff);
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			}
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		}
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		/* don't rewrite utilites */
		if (querytree->commandType == CMD_UTILITY)
		{
			new_list->qtrees[j++] = querytree;
			continue;
		}

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		if (DebugPrintParse)
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		{
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			TPRINTF(TRACE_PARSE, "parser outputs:");
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			nodeDisplay(querytree);
		}

		/* rewrite queries (retrieve, append, delete, replace) */
		rewritten = QueryRewrite(querytree);
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		if (rewritten != NIL)
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		{
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			int			len,
						k;
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			/*
			 * Rewrite the UNIONS.
			 */
			foreach(rewritten_list, rewritten)
			{
				Query	   *qry = (Query *) lfirst(rewritten_list);

				union_result = NIL;
				foreach(union_list, qry->unionClause)
					union_result = nconc(union_result, QueryRewrite((Query *) lfirst(union_list)));
				qry->unionClause = union_result;
			}

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			len = length(rewritten);
			if (len == 1)
				new_list->qtrees[j++] = (Query *) lfirst(rewritten);
			else
			{
				/* rewritten queries are longer than original query */
				/* grow the new_list to accommodate */
				new_list->len += len - 1;		/* - 1 because originally
												 * we allocated one space
												 * for the query */
				new_list->qtrees = realloc(new_list->qtrees,
										new_list->len * sizeof(Query *));
				for (k = 0; k < len; k++)
					new_list->qtrees[j++] = (Query *) nth(k, rewritten);
			}
		}
	}

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	/* ----------
	 * Due to rewriting, the new list could also have been
	 * shrunk (do instead nothing). Forget obsolete queries
	 * at the end.
	 * ----------
	 */
	new_list->len = j;

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	/* we're done with the original lists, free it */
	free(querytree_list->qtrees);
	free(querytree_list);

	querytree_list = new_list;

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	/*
	 * Override ACL checking if requested
	 */
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	if (aclOverride)
	{
		for (i = 0; i < querytree_list->len; i++)
		{
			RangeTblEntry *rte;
			List	   *l;
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			querytree = querytree_list->qtrees[i];
			if (querytree->commandType == CMD_UTILITY)
				continue;

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			foreach(l, querytree->rtable)
			{
				rte = (RangeTblEntry *) lfirst(l);
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				rte->skipAcl = TRUE;
			}
		}
	}

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	if (DebugPrintRewrittenParsetree)
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	{
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		TPRINTF(TRACE_REWRITTEN, "after rewriting:");
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		for (i = 0; i < querytree_list->len; i++)
		{
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			nodeDisplay(querytree_list->qtrees[i]);
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			printf("\n");
		}
	}

	for (i = 0; i < querytree_list->len; i++)
	{
		querytree = querytree_list->qtrees[i];

		/*
		 * For each query that isn't a utility invocation, generate a
		 * plan.
		 */

		if (querytree->commandType != CMD_UTILITY)
		{

			if (IsAbortedTransactionBlockState())
			{
				/* ----------------
				 *	 the EndCommand() stuff is to tell the frontend
				 *	 that the command ended. -cim 6/1/90
				 * ----------------
				 */
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				char	   *tag = "*ABORT STATE*";
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				EndCommand(tag, dest);

				elog(NOTICE, "(transaction aborted): %s",
					 "queries ignored until END");

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				free(querytree_list->qtrees);
				free(querytree_list);
				if (queryListP)
					*queryListP = (QueryTreeList *) NULL;
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				return (List *) NULL;
			}

			if (ShowPlannerStats)
				ResetUsage();
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			/* call that optimizer */
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			plan = planner(querytree);
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			if (ShowPlannerStats)
			{
				fprintf(stderr, "! Planner Stats:\n");
				ShowUsage();
			}
			plan_list = lappend(plan_list, plan);
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#ifdef INDEXSCAN_PATCH
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			/* ----------------
			 *	Print plan if debugging.
			 *	This has been moved here to get debugging output
			 *	also for queries in functions.	DZ - 27-8-1996
			 * ----------------
			 */
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			if (DebugPrintPlan)
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			{
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				TPRINTF(TRACE_PLAN, "plan:");
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				nodeDisplay(plan);
			}
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#endif
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		}
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#ifdef FUNC_UTIL_PATCH
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		/*
		 * If the command is an utility append a null plan. This is needed
		 * to keep the plan_list aligned with the querytree_list or the
		 * function executor will crash.  DZ - 30-8-1996
		 */
		else
			plan_list = lappend(plan_list, NULL);
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#endif
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	}

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	/* ----------
	 * Check if the rewriting had thrown away anything
	 * ----------
	 */
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	if (querytree_list->len == 0)
	{
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		free(querytree_list->qtrees);
		free(querytree_list);
		querytree_list = NULL;
	}

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	if (queryListP)
		*queryListP = querytree_list;

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	return plan_list;
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}

/* ----------------------------------------------------------------
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 *		pg_exec_query()
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 *
 *		Takes a querystring, runs the parser/utilities or
 *		parser/planner/executor over it as necessary
 *		Begin Transaction Should have been called before this
 *		and CommitTransaction After this is called
 *		This is strictly because we do not allow for nested xactions.
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 *
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 *		NON-OBVIOUS-RESTRICTIONS
 *		this function _MUST_ allocate a new "parsetree" each time,
 *		since it may be stored in a named portal and should not
 *		change its value.
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 *
 * ----------------------------------------------------------------
 */

void
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pg_exec_query(char *query_string)
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{
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	pg_exec_query_dest(query_string, whereToSendOutput, FALSE);
}

void
pg_exec_query_acl_override(char *query_string)
{
	pg_exec_query_dest(query_string, whereToSendOutput, TRUE);
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}

void
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pg_exec_query_dest(char *query_string,	/* string to execute */
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				   CommandDest dest,	/* where results should go */
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				   bool aclOverride)	/* to give utility commands power
										 * of superusers */
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{
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	List	   *plan_list;
	Plan	   *plan;
	Query	   *querytree;
	int			i,
				j;
	QueryTreeList *querytree_list;
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	/* plan the queries */
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	plan_list = pg_parse_and_plan(query_string, NULL, 0, &querytree_list, dest, aclOverride);
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	if (QueryCancel)
		CancelQuery();
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	/* pg_parse_and_plan could have failed */
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	if (querytree_list == NULL)
		return;

	for (i = 0; i < querytree_list->len; i++)
	{
		querytree = querytree_list->qtrees[i];

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#ifdef FUNC_UTIL_PATCH
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		/*
		 * Advance on the plan_list in every case.	Now the plan_list has
		 * the same length of the querytree_list.  DZ - 30-8-1996
		 */
		plan = (Plan *) lfirst(plan_list);
		plan_list = lnext(plan_list);
747
#endif
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		if (querytree->commandType == CMD_UTILITY)
		{
			/* ----------------
			 *	 process utility functions (create, destroy, etc..)
			 *
			 *	 Note: we do not check for the transaction aborted state
			 *	 because that is done in ProcessUtility.
			 * ----------------
			 */
757
			if (DebugPrintQuery)
758
				TPRINTF(TRACE_QUERY, "ProcessUtility: %s", query_string);
759
			else if (Verbose)
760
				TPRINTF(TRACE_VERBOSE, "ProcessUtility");
761 762 763 764 765 766

			ProcessUtility(querytree->utilityStmt, dest);

		}
		else
		{
767
#ifndef FUNC_UTIL_PATCH
768 769 770 771 772 773

			/*
			 * Moved before the if.  DZ - 30-8-1996
			 */
			plan = (Plan *) lfirst(plan_list);
			plan_list = lnext(plan_list);
774
#endif
775

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Marc G. Fournier committed
776
#ifdef INDEXSCAN_PATCH
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			/*
779
			 * Print moved in pg_parse_and_plan.	DZ - 27-8-1996
780
			 */
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#else
782 783 784 785
			/* ----------------
			 *	print plan if debugging
			 * ----------------
			 */
786
			if (DebugPrintPlan)
787
			{
788
				TPRINTF(TRACE_PLAN, "plan:");
789 790
				nodeDisplay(plan);
			}
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#endif
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Vadim B. Mikheev committed
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			SetQuerySnapshot();

			/*
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			 *	 execute the plan
			 */
			if (ShowExecutorStats)
				ResetUsage();

			for (j = 0; j < _exec_repeat_; j++)
			{
803 804
				if (Verbose)
					TPRINTF(TRACE_VERBOSE, "ProcessQuery");
805
				ProcessQuery(querytree, plan, dest);
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			}

			if (ShowExecutorStats)
			{
				fprintf(stderr, "! Executor Stats:\n");
				ShowUsage();
			}
		}

		/*
		 * In a query block, we want to increment the command counter
		 * between queries so that the effects of early queries are
		 * visible to subsequent ones.
		 */

		if (querytree_list)
			CommandCounterIncrement();
	}

	free(querytree_list->qtrees);
	free(querytree_list);
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}

/* --------------------------------
830
 *		signal handler routines used in PostgresMain()
831
 *
832
 *		handle_warn() is used to catch kill(getpid(),SIGQUIT) which
833
 *		occurs when elog(ERROR) is called.
834
 *
835 836 837
 *		quickdie() occurs when signalled by the postmaster.
 *		Some backend has bought the farm,
 *		so we need to stop what we're doing and exit.
838
 *
839
 *		die() preforms an orderly cleanup via ExitPostgres()
840 841 842 843
 * --------------------------------
 */

void
844
handle_warn(SIGNAL_ARGS)
845
{
846
	siglongjmp(Warn_restart, 1);
847 848
}

849
void
850
quickdie(SIGNAL_ARGS)
851
{
852
	elog(NOTICE, "Message from PostgreSQL backend:"
853 854 855 856 857
		 "\n\tThe Postmaster has informed me that some other backend"
		 " died abnormally and possibly corrupted shared memory."
		 "\n\tI have rolled back the current transaction and am"
		 " going to terminate your database system connection and exit."
	"\n\tPlease reconnect to the database system and repeat your query.");
858

859 860 861 862 863 864 865 866

	/*
	 * DO NOT ExitPostgres(0) -- we're here because shared memory may be
	 * corrupted, so we don't want to flush any shared state to stable
	 * storage.  Just nail the windows shut and get out of town.
	 */

	exit(0);
867 868 869
}

void
870
die(SIGNAL_ARGS)
871
{
872
	ExitPostgres(0);
873 874 875
}

/* signal handler for floating point exception */
876
void
877
FloatExceptionHandler(SIGNAL_ARGS)
878
{
879
	elog(ERROR, "floating point exception!"
880 881
		 " The last floating point operation either exceeded legal ranges"
		 " or was a divide by zero");
882 883 884
}


885
/* signal handler for query cancel signal from postmaster */
886 887 888 889 890 891 892 893 894
static void
QueryCancelHandler(SIGNAL_ARGS)
{
	QueryCancel = true;
}

void
CancelQuery(void)
{
895 896 897

	/*
	 * QueryCancel flag will be reset in main loop, which we reach by
898 899
	 * longjmp from elog().
	 */
900 901 902 903
	elog(ERROR, "Query was cancelled.");
}


904 905
static void
usage(char *progname)
906
{
907
	fprintf(stderr,
908
			"Usage: %s [options] [dbname]\n", progname);
909
#ifdef USE_ASSERT_CHECKING
910
	fprintf(stderr, "\t-A enable/disable assert checking\n");
911
#endif
912 913 914 915 916
	fprintf(stderr, "\t-B buffers\tset number of buffers in buffer pool\n");
	fprintf(stderr, "\t-C \t\tsupress version info\n");
	fprintf(stderr, "\t-D dir\t\tdata directory\n");
	fprintf(stderr, "\t-E \t\techo query before execution\n");
	fprintf(stderr, "\t-F \t\tturn off fsync\n");
917
#ifdef LOCK_MGR_DEBUG
918
	fprintf(stderr, "\t-K \t\tset locking debug level [0|1|2]\n");
919
#endif
920 921 922 923 924 925 926 927
	fprintf(stderr, "\t-P port\t\tset port file descriptor\n");
	fprintf(stderr, "\t-Q \t\tsuppress informational messages\n");
	fprintf(stderr, "\t-S buffers\tset amount of sort memory available\n");
	fprintf(stderr, "\t-d [1|2|3]\tset debug level\n");
	fprintf(stderr, "\t-e \t\tturn on European date format\n");
	fprintf(stderr, "\t-o file\t\tsend stdout and stderr to given filename \n");
	fprintf(stderr, "\t-s \t\tshow stats after each query\n");
	fprintf(stderr, "\t-v version\tset protocol version being used by frontend\n");
928
	fprintf(stderr, "\t-W \t\twait N seconds to allow attach from a debugger\n");
929 930 931
}

/* ----------------------------------------------------------------
932 933 934
 *		PostgresMain
 *		  postgres main loop
 *		all backends, interactive or otherwise start here
935 936 937
 * ----------------------------------------------------------------
 */
int
938
PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
939
{
940 941 942 943 944
	bool		flagC = false,
				flagQ = false,
				flagE = false,
				flagEu = false;
	int			flag;
945

946 947
	char	   *DBName = NULL;
	int			errs = 0;
948

949 950 951
	char		firstchar;
	char		parser_input[MAX_PARSE_BUFFER];
	char	   *userName;
952 953

	/* Used if verbose is set, must be initialized */
954 955 956
	char	   *remote_info = "interactive";
	char	   *remote_host = "";
	unsigned short remote_port = 0;
957

958 959 960 961
	char	   *DBDate = NULL;
	extern int	optind;
	extern char *optarg;
	extern short DebugLvl;
962 963 964 965 966

	/* ----------------
	 *	parse command line arguments
	 * ----------------
	 */
967 968 969 970

	/*
	 * Set default values.
	 */
971
	ShowStats = 0;
972
	ShowParserStats = ShowPlannerStats = ShowExecutorStats = 0;
973
	DeadlockCheckTimer = DEADLOCK_CHECK_TIMER;
974
#ifdef LOCK_MGR_DEBUG
975
	LockDebug = 0;
976 977
#endif

978
	/*
979 980
	 * get hostname is either the environment variable PGHOST or NULL NULL
	 * means Unix-socket only
981
	 */
982
	DataDir = getenv("PGDATA");
983

984
	/*
985 986 987
	 * Try to get initial values for date styles and formats. Does not do
	 * a complete job, but should be good enough for backend. Cannot call
	 * parse_date() since palloc/pfree memory is not set up yet.
988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002
	 */
	DBDate = getenv("PGDATESTYLE");
	if (DBDate != NULL)
	{
		if (strcasecmp(DBDate, "ISO") == 0)
			DateStyle = USE_ISO_DATES;
		else if (strcasecmp(DBDate, "SQL") == 0)
			DateStyle = USE_SQL_DATES;
		else if (strcasecmp(DBDate, "POSTGRES") == 0)
			DateStyle = USE_POSTGRES_DATES;
		else if (strcasecmp(DBDate, "GERMAN") == 0)
		{
			DateStyle = USE_GERMAN_DATES;
			EuroDates = TRUE;
		}
1003

1004 1005 1006 1007 1008
		if (strcasecmp(DBDate, "NONEURO") == 0)
			EuroDates = FALSE;
		else if (strcasecmp(DBDate, "EURO") == 0)
			EuroDates = TRUE;
	}
1009

1010 1011 1012
	/*
	 * Read default pg_options from file $DATADIR/pg_options.
	 */
1013 1014 1015
	if(DataDir) {
		read_pg_options(0);
	}
1016

1017 1018
	optind = 1;					/* reset after postmaster usage */

1019
	while ((flag = getopt(argc, argv,
1020
						  "A:B:CD:d:Eef:iK:Lm:MNo:P:pQS:st:v:x:FW:"))
1021 1022 1023
		   != EOF)
		switch (flag)
		{
1024 1025
			case 'A':
				/* ----------------
1026
				 *	enable/disable assert checking.
1027 1028 1029 1030 1031 1032 1033 1034
				 * ----------------
				 */
#ifdef USE_ASSERT_CHECKING
				assert_enabled = atoi(optarg);
#else
				fprintf(stderr, "Assert checking is not enabled\n");
#endif
				break;
1035

1036 1037 1038 1039 1040 1041 1042
			case 'B':
				/* ----------------
				 *	specify the size of buffer pool
				 * ----------------
				 */
				NBuffers = atoi(optarg);
				break;
1043

1044 1045 1046 1047 1048
			case 'C':
				/* ----------------
				 *	don't print version string (don't know why this is 'C' --mao)
				 * ----------------
				 */
1049
				flagC = true;
1050
				break;
1051

1052
			case 'D':			/* PGDATA directory */
1053 1054 1055 1056 1057
			        if (!DataDir) {
				    DataDir = optarg;
				    /* must be done after DataDir is defined */
				    read_pg_options(0);
				}
1058
				DataDir = optarg;
1059
				break;
1060

1061
			case 'd':			/* debug level */
1062
				flagQ = false;
1063
				DebugLvl = (short) atoi(optarg);
1064 1065 1066
				if (DebugLvl >= 1)
					Verbose = DebugLvl;
				if (DebugLvl >= 2)
1067
					DebugPrintQuery = true;
1068 1069 1070
				if (DebugLvl >= 3)
					DebugPrintQuery = DebugLvl;
				if (DebugLvl >= 4)
1071
				{
1072 1073 1074 1075
					DebugPrintParse = true;
					DebugPrintPlan = true;
					DebugPrintRewrittenParsetree = true;
				}
1076
				break;
1077 1078 1079 1080 1081 1082

			case 'E':
				/* ----------------
				 *	E - echo the query the user entered
				 * ----------------
				 */
1083
				flagE = true;
1084
				break;
1085 1086 1087 1088 1089 1090

			case 'e':
				/* --------------------------
				 * Use european date formats.
				 * --------------------------
				 */
1091
				flagEu = true;
1092
				break;
1093 1094 1095 1096 1097 1098 1099

			case 'F':
				/* --------------------
				 *	turn off fsync
				 * --------------------
				 */
				fsyncOff = 1;
1100
				break;
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118

			case 'f':
				/* -----------------
				 *	  f - forbid generation of certain plans
				 * -----------------
				 */
				switch (optarg[0])
				{
					case 's':	/* seqscan */
						_enable_seqscan_ = false;
						break;
					case 'i':	/* indexscan */
						_enable_indexscan_ = false;
						break;
					case 'n':	/* nestloop */
						_enable_nestloop_ = false;
						break;
					case 'm':	/* mergejoin */
1119
						_enable_mergejoin_ = false;
1120 1121 1122 1123 1124 1125 1126
						break;
					case 'h':	/* hashjoin */
						_enable_hashjoin_ = false;
						break;
					default:
						errs++;
				}
1127 1128
				break;

1129 1130 1131
			case 'i':
				dontExecute = 1;
				break;
1132

1133
			case 'K':
1134
#ifdef LOCK_MGR_DEBUG
1135
				LockDebug = atoi(optarg);
1136
#else
1137
				fprintf(stderr, "Lock debug not compiled in\n");
1138
#endif
1139
				break;
1140

1141 1142 1143 1144 1145 1146 1147
			case 'L':
				/* --------------------
				 *	turn off locking
				 * --------------------
				 */
				lockingOff = 1;
				break;
1148

1149
			case 'm':
1150
				/* Multiplexed backends are no longer supported. */
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161
				break;
			case 'M':
				exit(PostmasterMain(argc, argv));
				break;
			case 'N':
				/* ----------------
				 *	N - Don't use newline as a query delimiter
				 * ----------------
				 */
				UseNewLine = 0;
				break;
1162

1163 1164 1165 1166 1167
			case 'o':
				/* ----------------
				 *	o - send output (stdout and stderr) to the given file
				 * ----------------
				 */
1168
				StrNCpy(OutputFileName, optarg, MAXPGPATH);
1169
				break;
1170

1171 1172 1173 1174 1175 1176 1177 1178
			case 'p':			/* started by postmaster */
				/* ----------------
				 *	p - special flag passed if backend was forked
				 *		by a postmaster.
				 * ----------------
				 */
				IsUnderPostmaster = true;
				break;
1179

1180 1181 1182 1183 1184 1185 1186 1187 1188
			case 'P':
				/* ----------------
				 *	P - Use the passed file descriptor number as the port
				 *	  on which to communicate with the user.  This is ONLY
				 *	  useful for debugging when fired up by the postmaster.
				 * ----------------
				 */
				Portfd = atoi(optarg);
				break;
1189

1190 1191 1192 1193 1194
			case 'Q':
				/* ----------------
				 *	Q - set Quiet mode (reduce debugging output)
				 * ----------------
				 */
1195
				flagQ = true;
1196
				Verbose = 0;
1197
				break;
1198

1199 1200
			case 'S':
				/* ----------------
1201
				 *	S - amount of sort memory to use in 1k bytes
1202 1203
				 * ----------------
				 */
1204
				{
1205 1206
					int			S;

1207
					S = atoi(optarg);
1208
					if (S >= 4 * BLCKSZ / 1024)
1209
						SortMem = S;
1210
				}
1211
				break;
1212 1213 1214 1215 1216 1217 1218 1219

			case 's':
				/* ----------------
				 *	  s - report usage statistics (timings) after each query
				 * ----------------
				 */
				ShowStats = 1;
				StatFp = stderr;
1220
				break;
1221

1222
			case 'T':
1223 1224 1225
				parse_options(optarg);
				break;

1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
			case 't':
				/* ----------------
				 *	tell postgres to report usage statistics (timings) for
				 *	each query
				 *
				 *	-tpa[rser] = print stats for parser time of each query
				 *	-tpl[anner] = print stats for planner time of each query
				 *	-te[xecutor] = print stats for executor time of each query
				 *	caution: -s can not be used together with -t.
				 * ----------------
				 */
				StatFp = stderr;
				switch (optarg[0])
				{
					case 'p':
						if (optarg[1] == 'a')
							ShowParserStats = 1;
						else if (optarg[1] == 'l')
							ShowPlannerStats = 1;
						else
							errs++;
						break;
					case 'e':
						ShowExecutorStats = 1;
						break;
					default:
						errs++;
						break;
				}
1255 1256
				break;

1257
			case 'v':
1258
				FrontendProtocol = (ProtocolVersion) atoi(optarg);
1259 1260
				break;

1261 1262
			case 'W':
				/* ----------------
1263
				 *	wait N seconds to allow attach from a debugger
1264 1265 1266 1267 1268
				 * ----------------
				 */
				sleep(atoi(optarg));
				break;

1269
			case 'x':
1270
#if 0							/* planner/xfunc.h */
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298

				/*
				 * control joey hellerstein's expensive function
				 * optimization
				 */
				if (XfuncMode != 0)
				{
					fprintf(stderr, "only one -x flag is allowed\n");
					errs++;
					break;
				}
				if (strcmp(optarg, "off") == 0)
					XfuncMode = XFUNC_OFF;
				else if (strcmp(optarg, "nor") == 0)
					XfuncMode = XFUNC_NOR;
				else if (strcmp(optarg, "nopull") == 0)
					XfuncMode = XFUNC_NOPULL;
				else if (strcmp(optarg, "nopm") == 0)
					XfuncMode = XFUNC_NOPM;
				else if (strcmp(optarg, "pullall") == 0)
					XfuncMode = XFUNC_PULLALL;
				else if (strcmp(optarg, "wait") == 0)
					XfuncMode = XFUNC_WAIT;
				else
				{
					fprintf(stderr, "use -x {off,nor,nopull,nopm,pullall,wait}\n");
					errs++;
				}
1299
#endif
1300
				break;
1301

1302 1303 1304 1305 1306 1307
			default:
				/* ----------------
				 *	default: bad command line option
				 * ----------------
				 */
				errs++;
1308 1309 1310 1311 1312 1313 1314 1315 1316
		}

	/* ----------------
	 *	get user name and pathname and check command line validity
	 * ----------------
	 */
	SetPgUserName();
	userName = GetPgUserName();

1317
#ifdef CYR_RECODE
1318
	SetCharSet();
1319 1320
#endif

1321
	if (FindExec(pg_pathname, argv[0], "postgres") < 0)
1322 1323 1324 1325 1326 1327
		elog(FATAL, "%s: could not locate executable, bailing out...",
			 argv[0]);

	if (errs || argc - optind > 1)
	{
		usage(argv[0]);
1328
		proc_exit(1);
1329 1330 1331 1332 1333 1334 1335
	}
	else if (argc - optind == 1)
		DBName = argv[optind];
	else if ((DBName = userName) == NULL)
	{
		fprintf(stderr, "%s: USER undefined and no database specified\n",
				argv[0]);
1336
		proc_exit(1);
1337 1338 1339 1340 1341 1342
	}

	if (ShowStats &&
		(ShowParserStats || ShowPlannerStats || ShowExecutorStats))
	{
		fprintf(stderr, "-s can not be used together with -t.\n");
1343
		proc_exit(1);
1344 1345 1346 1347 1348 1349 1350 1351 1352
	}

	if (!DataDir)
	{
		fprintf(stderr, "%s does not know where to find the database system "
				"data.  You must specify the directory that contains the "
				"database system either by specifying the -D invocation "
			 "option or by setting the PGDATA environment variable.\n\n",
				argv[0]);
1353
		proc_exit(1);
1354 1355 1356 1357 1358 1359
	}

	Noversion = flagC;
	EchoQuery = flagE;
	EuroDates = flagEu;

1360 1361 1362
	/*
	 * Find remote host name or address.
	 */
1363 1364 1365 1366 1367
	if (IsUnderPostmaster)
	{
		switch (MyProcPort->raddr.sa.sa_family)
		{
				struct hostent *host_ent;
1368

1369
			case AF_INET:
1370 1371 1372
				remote_info = remote_host = malloc(48);
				remote_port = ntohs(MyProcPort->raddr.in.sin_port);
				strcpy(remote_host, inet_ntoa(MyProcPort->raddr.in.sin_addr));
1373 1374
				if (HostnameLookup)
				{
1375
					host_ent = \
1376 1377
						gethostbyaddr((char *) &MyProcPort->raddr.in.sin_addr,
								   sizeof(MyProcPort->raddr.in.sin_addr),
1378
									  AF_INET);
1379 1380
					if (host_ent)
					{
1381
						strncpy(remote_host, host_ent->h_name, 48);
1382
						*(remote_host + 47) = '\0';
1383 1384
					}
				}
1385 1386 1387
				if (ShowPortNumber)
				{
					remote_info = malloc(strlen(remote_host) + 6);
1388 1389 1390
					sprintf(remote_info, "%s:%d", remote_host, remote_port);
				}
				break;
1391
			case AF_UNIX:
1392 1393
				remote_info = remote_host = "localhost";
				break;
1394
			default:
1395 1396 1397 1398 1399
				remote_info = remote_host = "unknown";
				break;
		}
	}

1400
	/* ----------------
1401
	 *	set process params for ps
1402 1403
	 * ----------------
	 */
1404 1405 1406
	if (IsUnderPostmaster)
	{
		PS_INIT_STATUS(real_argc, real_argv, argv[0],
1407
					   remote_info, userName, DBName);
1408
		PS_SET_STATUS("startup");
1409 1410
	}

1411
	/* ----------------
1412
	 *	print flags
1413 1414
	 * ----------------
	 */
1415
	if (Verbose)
1416
	{
1417 1418
		if (Verbose == 1)
		{
1419 1420
			TPRINTF(TRACE_VERBOSE, "started: host=%s user=%s database=%s",
					remote_host, userName, DBName);
1421 1422 1423
		}
		else
		{
1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437
			TPRINTF(TRACE_VERBOSE, "debug info:");
			TPRINTF(TRACE_VERBOSE, "\tUser         = %s", userName);
			TPRINTF(TRACE_VERBOSE, "\tRemoteHost   = %s", remote_host);
			TPRINTF(TRACE_VERBOSE, "\tRemotePort   = %d", remote_port);
			TPRINTF(TRACE_VERBOSE, "\tDatabaseName = %s", DBName);
			TPRINTF(TRACE_VERBOSE, "\tVerbose      = %d", Verbose);
			TPRINTF(TRACE_VERBOSE, "\tNoversion    = %c", Noversion ? 't' : 'f');
			TPRINTF(TRACE_VERBOSE, "\ttimings      = %c", ShowStats ? 't' : 'f');
			TPRINTF(TRACE_VERBOSE, "\tdates        = %s",
					EuroDates ? "European" : "Normal");
			TPRINTF(TRACE_VERBOSE, "\tbufsize      = %d", NBuffers);
			TPRINTF(TRACE_VERBOSE, "\tsortmem      = %d", SortMem);
			TPRINTF(TRACE_VERBOSE, "\tquery echo   = %c", EchoQuery ? 't' : 'f');
		}
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	}

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	/* ----------------
	 *	initialize portal file descriptors
	 * ----------------
	 */
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	if (IsUnderPostmaster)
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	{
		if (Portfd < 0)
		{
			fprintf(stderr,
					"Postmaster flag set: no port number specified, use /dev/null\n");
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#ifndef __CYGWIN32__
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			Portfd = open(NULL_DEV, O_RDWR, 0666);
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#else
			Portfd = open(NULL_DEV, O_RDWR | O_BINARY, 0666);
#endif
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		}
		pq_init(Portfd);
		whereToSendOutput = Remote;
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	}
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	else
		whereToSendOutput = Debug;

	SetProcessingMode(InitProcessing);

	/* initialize */
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	if (Verbose)
		TPRINTF(TRACE_VERBOSE, "InitPostgres");
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	InitPostgres(DBName);

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#ifdef MULTIBYTE
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	/* set default client encoding */
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	if (Verbose)
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		puts("\treset_client_encoding()..");
	reset_client_encoding();
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	if (Verbose)
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		puts("\treset_client_encoding() done.");
#endif

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	/* ----------------
	 * if stable main memory is assumed (-S(old) flag is set), it is necessary
	 * to flush all dirty shared buffers before exit
	 * plai 8/7/90
	 * this used to be done further down, causing an additional entry in
	 * the shmem exit list for every error :-( ... tgl 10/1/98
	 * ----------------
	 */
	if (!TransactionFlushEnabled())
		on_shmem_exit(FlushBufferPool, NULL);

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	on_shmem_exit(remove_all_temp_relations, NULL);

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	/* ----------------
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	 *	Set up handler for cancel-request signal, and
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	 *	send this backend's cancellation info to the frontend.
	 *	This should not be done until we are sure startup is successful.
	 * ----------------
	 */

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	pqsignal(SIGHUP, read_pg_options);	/* update pg_options from file */
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	pqsignal(SIGINT, QueryCancelHandler);		/* cancel current query */
	pqsignal(SIGQUIT, handle_warn);		/* handle error */
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	pqsignal(SIGTERM, die);
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	pqsignal(SIGPIPE, SIG_IGN);	/* ignore failure to write to frontend */
	/* Note: if frontend closes connection, we will notice it and exit cleanly
	 * when control next returns to outer loop.  This seems safer than forcing
	 * exit in the midst of output during who-knows-what operation...
	 */
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	pqsignal(SIGUSR1, quickdie);
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	pqsignal(SIGUSR2, Async_NotifyHandler);		/* flush also sinval cache */
	pqsignal(SIGCHLD, SIG_IGN); /* ignored, sent by LockOwners */
	pqsignal(SIGFPE, FloatExceptionHandler);
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	if (whereToSendOutput == Remote &&
		PG_PROTOCOL_MAJOR(FrontendProtocol) >= 2)
	{
		pq_putnchar("K", 1);
		pq_putint((int32) MyProcPid, sizeof(int32));
		pq_putint((int32) MyCancelKey, sizeof(int32));
		/* Need not flush since ReadyForQuery will do it. */
	}

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	if (!IsUnderPostmaster)
	{
		puts("\nPOSTGRES backend interactive interface ");
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		puts("$Revision: 1.103 $ $Date: 1999/02/18 06:00:49 $\n");
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	}

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	/* ----------------
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	 *	POSTGRES main processing loop begins here
	 *
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	 *	if an exception is encountered, processing resumes here
	 *	so we abort the current transaction and start a new one.
	 *	This must be done after we initialize the slave backends
	 *	so that the slaves signal the master to abort the transaction
	 *	rather than calling AbortCurrentTransaction() themselves.
	 *
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	 *	Note:  elog(ERROR) causes a kill(getpid(),SIGQUIT) to occur
	 *		   sending us back here.
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	 * ----------------
	 */

	if (sigsetjmp(Warn_restart, 1) != 0)
	{
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		InError = true;
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		time(&tim);

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		if (Verbose)
			TPRINTF(TRACE_VERBOSE, "AbortCurrentTransaction");
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		AbortCurrentTransaction();
	}
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	InError = false;
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	/*
	 * Non-error queries loop here.
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	 */

	for (;;)
	{
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		PS_SET_STATUS("idle");

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		/* ----------------
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		 *	 (1) tell the frontend we're ready for a new query.
		 *
		 *   Note: this includes fflush()'ing the last of the prior output.
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		 * ----------------
		 */
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		ReadyForQuery(whereToSendOutput);
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		/* ----------------
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		 *	 (2) deal with pending asynchronous NOTIFY from other backends,
		 *   and enable async.c's signal handler to execute NOTIFY directly.
		 * ----------------
		 */
		QueryCancel = false;	/* forget any earlier CANCEL signal */

		EnableNotifyInterrupt();

		/* ----------------
		 *	 (3) read a command.
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		 * ----------------
		 */
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		MemSet(parser_input, 0, MAX_PARSE_BUFFER);
1586

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		firstchar = ReadCommand(parser_input);
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		QueryCancel = false;	/* forget any earlier CANCEL signal */
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		/* ----------------
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		 *	 (4) disable async.c's signal handler.
		 * ----------------
		 */
		DisableNotifyInterrupt();

		/* ----------------
		 *	 (5) process the command.
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		 * ----------------
		 */
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		switch (firstchar)
		{
				/* ----------------
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				 *	'F' indicates a fastpath call.
				 *		XXX HandleFunctionRequest
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				 * ----------------
				 */
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			case 'F':
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				IsEmptyQuery = false;

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				/* start an xact for this function invocation */
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				if (Verbose)
					TPRINTF(TRACE_VERBOSE, "StartTransactionCommand");
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				StartTransactionCommand();
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				HandleFunctionRequest();
				break;
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				/* ----------------
				 *	'Q' indicates a user query
				 * ----------------
				 */
			case 'Q':
				if (strspn(parser_input, " \t\n") == strlen(parser_input))
				{
					/* ----------------
					 *	if there is nothing in the input buffer, don't bother
					 *	trying to parse and execute anything..
					 * ----------------
					 */
					IsEmptyQuery = true;
				}
				else
				{
					/* ----------------
					 *	otherwise, process the input string.
					 * ----------------
					 */
					IsEmptyQuery = false;
					if (ShowStats)
						ResetUsage();

					/* start an xact for this query */
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					if (Verbose)
						TPRINTF(TRACE_VERBOSE, "StartTransactionCommand");
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					StartTransactionCommand();
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					pg_exec_query(parser_input);

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					if (ShowStats)
						ShowUsage();
				}
				break;

				/* ----------------
				 *	'X' means that the frontend is closing down the socket
				 * ----------------
				 */
			case 'X':
				pq_close();
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				proc_exit(0);
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				break;

			default:
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				elog(ERROR, "unknown frontend message was received");
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		}

		/* ----------------
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		 *	 (6) commit the current transaction
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		 *
		 *	 Note: if we had an empty input buffer, then we didn't
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		 *	 call pg_exec_query, so we don't bother to commit this transaction.
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		 * ----------------
		 */
		if (!IsEmptyQuery)
		{
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			if (Verbose)
				TPRINTF(TRACE_VERBOSE, "CommitTransactionCommand");
			PS_SET_STATUS("commit");
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			CommitTransactionCommand();
		}
		else
		{
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			if (IsUnderPostmaster)
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				NullCommand(Remote);
		}
	}							/* infinite for-loop */
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	proc_exit(0);				/* shouldn't get here... */
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	return 1;
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}

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#ifndef HAVE_GETRUSAGE
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#include "rusagestub.h"
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#else							/* HAVE_GETRUSAGE */
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#include <sys/resource.h>
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#endif	 /* HAVE_GETRUSAGE */
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struct rusage Save_r;
struct timeval Save_t;
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void
1703
ResetUsage(void)
1704
{
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	struct timezone tz;

	getrusage(RUSAGE_SELF, &Save_r);
	gettimeofday(&Save_t, &tz);
	ResetBufferUsage();
/*	  ResetTupleCount(); */
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}

void
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ShowUsage(void)
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{
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	struct timeval user,
				sys;
	struct timeval elapse_t;
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	struct timezone tz;
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	struct rusage r;
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	getrusage(RUSAGE_SELF, &r);
	gettimeofday(&elapse_t, &tz);
	memmove((char *) &user, (char *) &r.ru_utime, sizeof(user));
	memmove((char *) &sys, (char *) &r.ru_stime, sizeof(sys));
	if (elapse_t.tv_usec < Save_t.tv_usec)
	{
		elapse_t.tv_sec--;
		elapse_t.tv_usec += 1000000;
	}
	if (r.ru_utime.tv_usec < Save_r.ru_utime.tv_usec)
	{
		r.ru_utime.tv_sec--;
		r.ru_utime.tv_usec += 1000000;
	}
	if (r.ru_stime.tv_usec < Save_r.ru_stime.tv_usec)
	{
		r.ru_stime.tv_sec--;
		r.ru_stime.tv_usec += 1000000;
	}

	/*
	 * the only stats we don't show here are for memory usage -- i can't
	 * figure out how to interpret the relevant fields in the rusage
	 * struct, and they change names across o/s platforms, anyway. if you
	 * can figure out what the entries mean, you can somehow extract
	 * resident set size, shared text size, and unshared data and stack
	 * sizes.
	 */

	fprintf(StatFp, "! system usage stats:\n");
	fprintf(StatFp,
			"!\t%ld.%06ld elapsed %ld.%06ld user %ld.%06ld system sec\n",
			(long int) elapse_t.tv_sec - Save_t.tv_sec,
			(long int) elapse_t.tv_usec - Save_t.tv_usec,
			(long int) r.ru_utime.tv_sec - Save_r.ru_utime.tv_sec,
			(long int) r.ru_utime.tv_usec - Save_r.ru_utime.tv_usec,
			(long int) r.ru_stime.tv_sec - Save_r.ru_stime.tv_sec,
			(long int) r.ru_stime.tv_usec - Save_r.ru_stime.tv_usec);
	fprintf(StatFp,
			"!\t[%ld.%06ld user %ld.%06ld sys total]\n",
			(long int) user.tv_sec,
			(long int) user.tv_usec,
			(long int) sys.tv_sec,
			(long int) sys.tv_usec);
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#ifdef HAVE_GETRUSAGE
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	fprintf(StatFp,
			"!\t%ld/%ld [%ld/%ld] filesystem blocks in/out\n",
			r.ru_inblock - Save_r.ru_inblock,
	/* they only drink coffee at dec */
			r.ru_oublock - Save_r.ru_oublock,
			r.ru_inblock, r.ru_oublock);
	fprintf(StatFp,
		  "!\t%ld/%ld [%ld/%ld] page faults/reclaims, %ld [%ld] swaps\n",
			r.ru_majflt - Save_r.ru_majflt,
			r.ru_minflt - Save_r.ru_minflt,
			r.ru_majflt, r.ru_minflt,
			r.ru_nswap - Save_r.ru_nswap,
			r.ru_nswap);
	fprintf(StatFp,
	 "!\t%ld [%ld] signals rcvd, %ld/%ld [%ld/%ld] messages rcvd/sent\n",
			r.ru_nsignals - Save_r.ru_nsignals,
			r.ru_nsignals,
			r.ru_msgrcv - Save_r.ru_msgrcv,
			r.ru_msgsnd - Save_r.ru_msgsnd,
			r.ru_msgrcv, r.ru_msgsnd);
	fprintf(StatFp,
		 "!\t%ld/%ld [%ld/%ld] voluntary/involuntary context switches\n",
			r.ru_nvcsw - Save_r.ru_nvcsw,
			r.ru_nivcsw - Save_r.ru_nivcsw,
			r.ru_nvcsw, r.ru_nivcsw);
1792
#endif	 /* HAVE_GETRUSAGE */
1793 1794 1795
	fprintf(StatFp, "! postgres usage stats:\n");
	PrintBufferUsage(StatFp);
/*	   DisplayTupleCount(StatFp); */
1796
}
1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811

#ifdef USE_ASSERT_CHECKING
int
assertEnable(int val)
{
	assert_enabled = val;
	return val;
}

#ifdef ASSERT_CHECKING_TEST
int
assertTest(int val)
{
	Assert(val == 0);

1812 1813
	if (assert_enabled)
	{
1814 1815 1816
		/* val != 0 should be trapped by previous Assert */
		elog(NOTICE, "Assert test successfull (val = %d)", val);
	}
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	else
		elog(NOTICE, "Assert checking is disabled (val = %d)", val);
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	return val;
}
1822

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#endif
#endif