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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 1.81 1998/07/26 04:30:46 scrappy 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 "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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#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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#ifdef MULTIBYTE
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#include "mb/pg_wchar.h"
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#endif

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/* ----------------
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 *		global variables
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 * ----------------
 */
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static bool DebugPrintQuery = false;
static bool DebugPrintPlan = false;
static bool DebugPrintParse = false;
static bool DebugPrintRewrittenParsetree = false;
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/*static bool	EnableRewrite = true; , never changes why have it*/
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CommandDest whereToSendOutput;
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const char **ps_status;	/* this is our 'ps' status, argv[3] */
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#ifdef LOCK_MGR_DEBUG
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extern int	lockDebug;
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#endif
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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) */
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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];
static int	ShowParserStats;
static int	ShowPlannerStats;
int			ShowExecutorStats;
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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/* ----------------
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 *		bushy tree plan flag: if true planner will generate bushy-tree
 *		plans
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 * ----------------
 */
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int			BushyPlanFlag = 0;	/* default to false -- consider only
								 * left-deep trees */
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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("> ");

	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)
		{
			if (!Quiet)
				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)
		printf("query is: %s\n", inBuf);

	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 */
				  CommandDest dest)		/* where results should go */
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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];


		/* don't rewrite utilites */
		if (querytree->commandType == CMD_UTILITY)
		{
			new_list->qtrees[j++] = querytree;
			continue;
		}

		if (DebugPrintQuery == true)
		{
			printf("\n---- \tquery is:\n%s\n", query_string);
			printf("\n");
			fflush(stdout);
		}

		if (DebugPrintParse == true)
		{
			printf("\n---- \tparser outputs :\n");
			nodeDisplay(querytree);
			printf("\n");
		}

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

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

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		if (rewritten != NULL)
		{
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			int			len,
						k;
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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);
			}
		}
	}

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

	querytree_list = new_list;

	if (DebugPrintRewrittenParsetree == true)
	{
		printf("\n---- \tafter rewriting:\n");

		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");

				*queryListP = (QueryTreeList *) NULL;
				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
			 * ----------------
			 */
			if (DebugPrintPlan == true)
			{
				printf("\n---- \tplan is :\n");
				nodeDisplay(plan);
				printf("\n");
			}
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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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	}

	if (queryListP)
		*queryListP = querytree_list;

	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);
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}

void
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pg_exec_query_dest(char *query_string,	/* string to execute */
				   CommandDest dest)	/* where results should go */
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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);
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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);
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#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.
			 * ----------------
			 */
			if (!Quiet)
			{
				time(&tim);
				printf("\tProcessUtility() at %s\n", ctime(&tim));
			}

			ProcessUtility(querytree->utilityStmt, dest);

		}
		else
		{
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#ifndef FUNC_UTIL_PATCH
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			/*
			 * Moved before the if.  DZ - 30-8-1996
			 */
			plan = (Plan *) lfirst(plan_list);
			plan_list = lnext(plan_list);
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#endif
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#ifdef INDEXSCAN_PATCH
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			/*
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			 * Print moved in pg_parse_and_plan.	DZ - 27-8-1996
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			 */
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#else
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			/* ----------------
			 *	print plan if debugging
			 * ----------------
			 */
			if (DebugPrintPlan == true)
			{
				printf("\n---- plan is :\n");
				nodeDisplay(plan);
				printf("\n");
			}
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#endif
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			/* ----------------
			 *	 execute the plan
			 *
			 */
			if (ShowExecutorStats)
				ResetUsage();

			for (j = 0; j < _exec_repeat_; j++)
			{
				if (!Quiet)
				{
					time(&tim);
					printf("\tProcessQuery() at %s\n", ctime(&tim));
				}
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				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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}

/* --------------------------------
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 *		signal handler routines used in PostgresMain()
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 *
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 *		handle_warn() is used to catch kill(getpid(), SIGHUP) which
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 *		occurs when elog(ERROR) is called.
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 *
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 *		quickdie() occurs when signalled by the postmaster.
 *		Some backend has bought the farm,
 *		so we need to stop what we're doing and exit.
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 *
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 *		die() preforms an orderly cleanup via ExitPostgres()
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 * --------------------------------
 */

void
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handle_warn(SIGNAL_ARGS)
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{
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	siglongjmp(Warn_restart, 1);
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}

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void
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quickdie(SIGNAL_ARGS)
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{
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	elog(NOTICE, "Message from PostgreSQL backend:"
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		 "\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.");
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	/*
	 * 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);
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}

void
765
die(SIGNAL_ARGS)
766
{
767
	ExitPostgres(0);
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}

/* signal handler for floating point exception */
771
void
772
FloatExceptionHandler(SIGNAL_ARGS)
773
{
774
	elog(ERROR, "floating point exception!"
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		 " The last floating point operation either exceeded legal ranges"
		 " or was a divide by zero");
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}


780
/* signal handler for query cancel signal from postmaster */
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static void
QueryCancelHandler(SIGNAL_ARGS)
{
	QueryCancel = true;
}

void
CancelQuery(void)
{
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	/* QueryCancel flag will be reset in main loop, which we reach by
	 * longjmp from elog().
	 */
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	elog(ERROR, "Query was cancelled.");
}


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static void
usage(char *progname)
799
{
800
	fprintf(stderr,
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			"Usage: %s [options] [dbname]\n", progname);
	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");
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#ifdef LOCK_MGR_DEBUG
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	fprintf(stderr, "\t-K \t\tset locking debug level [0|1|2]\n");
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#endif
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	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");
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}

/* ----------------------------------------------------------------
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 *		PostgresMain
 *		  postgres main loop
 *		all backends, interactive or otherwise start here
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 * ----------------------------------------------------------------
 */
int
827
PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
828
{
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	bool			flagC = false,
					flagQ = false,
					flagE = false,
					flagEu = false;
	int				flag;
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	char	   *DBName = NULL;
	int			errs = 0;

	char		firstchar;
	char		parser_input[MAX_PARSE_BUFFER];
	char	   *userName;

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	char	   *DBDate = NULL;
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	extern int	optind;
	extern char *optarg;
	extern short DebugLvl;
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	/* ----------------
	 *	parse command line arguments
	 * ----------------
	 */
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	/*
	 * Set default values.
	 */
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	ShowStats = 0;
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	ShowParserStats = ShowPlannerStats = ShowExecutorStats = 0;
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#ifdef LOCK_MGR_DEBUG
858
	lockDebug = 0;
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#endif

861
	/*
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	 * get hostname is either the environment variable PGHOST or NULL NULL
	 * means Unix-socket only
864
	 */
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	DataDir = getenv("PGDATA");
866

867
	/*
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	 * 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.
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	 */
	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;
		}
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		if (strcasecmp(DBDate, "NONEURO") == 0)
			EuroDates = FALSE;
		else if (strcasecmp(DBDate, "EURO") == 0)
			EuroDates = TRUE;
	}
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    optind = 1; /* reset after postmaster usage */
	
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	while ((flag = getopt(argc, argv, "B:bCD:d:Eef:iK:Lm:MNo:P:pQS:st:v:x:F"))
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		   != EOF)
		switch (flag)
		{

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			case 'b':
				/* ----------------
				 *	set BushyPlanFlag to true.
				 * ----------------
				 */
				BushyPlanFlag = 1;
				break;
			case 'B':
				/* ----------------
				 *	specify the size of buffer pool
				 * ----------------
				 */
				NBuffers = atoi(optarg);
				break;
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			case 'C':
				/* ----------------
				 *	don't print version string (don't know why this is 'C' --mao)
				 * ----------------
				 */
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				flagC = true;
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				break;
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			case 'D':			/* PGDATA directory */
				DataDir = optarg;
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926
			case 'd':			/* debug level */
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				flagQ = false;
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				DebugLvl = (short) atoi(optarg);
				if (DebugLvl > 1)
					DebugPrintQuery = true;
				if (DebugLvl > 2)
				{
					DebugPrintParse = true;
					DebugPrintPlan = true;
					DebugPrintRewrittenParsetree = true;
				}
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				break;
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			case 'E':
				/* ----------------
				 *	E - echo the query the user entered
				 * ----------------
				 */
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				flagE = true;
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				break;
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			case 'e':
				/* --------------------------
				 * Use european date formats.
				 * --------------------------
				 */
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				flagEu = true;
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				break;
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			case 'F':
				/* --------------------
				 *	turn off fsync
				 * --------------------
				 */
				fsyncOff = 1;
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				break;
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			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 */
						_enable_mergesort_ = false;
						break;
					case 'h':	/* hashjoin */
						_enable_hashjoin_ = false;
						break;
					default:
						errs++;
				}
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				break;

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			case 'i':
				dontExecute = 1;
				break;
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994
			case 'K':
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#ifdef LOCK_MGR_DEBUG
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				lockDebug = atoi(optarg);
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#else
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				fprintf(stderr, "Lock debug not compiled in\n");
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#endif
1000
				break;
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			case 'L':
				/* --------------------
				 *	turn off locking
				 * --------------------
				 */
				lockingOff = 1;
				break;
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1010
			case 'm':
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				/* Multiplexed backends are no longer supported. */
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				break;
			case 'M':
				exit(PostmasterMain(argc, argv));
				break;
			case 'N':
				/* ----------------
				 *	N - Don't use newline as a query delimiter
				 * ----------------
				 */
				UseNewLine = 0;
				break;
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			case 'o':
				/* ----------------
				 *	o - send output (stdout and stderr) to the given file
				 * ----------------
				 */
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				StrNCpy(OutputFileName, optarg, MAXPGPATH);
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				break;
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			case 'p':			/* started by postmaster */
				/* ----------------
				 *	p - special flag passed if backend was forked
				 *		by a postmaster.
				 * ----------------
				 */
				IsUnderPostmaster = true;
				break;
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			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;
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			case 'Q':
				/* ----------------
				 *	Q - set Quiet mode (reduce debugging output)
				 * ----------------
				 */
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				flagQ = true;
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				break;
1058

1059 1060
			case 'S':
				/* ----------------
1061
				 *	S - amount of sort memory to use in 1k bytes
1062 1063
				 * ----------------
				 */
1064
				{
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					int			S;

1067
					S = atoi(optarg);
1068
					if (S >= 4 * BLCKSZ / 1024)
1069
						SortMem = S;
1070
				}
1071
				break;
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			case 's':
				/* ----------------
				 *	  s - report usage statistics (timings) after each query
				 * ----------------
				 */
				ShowStats = 1;
				StatFp = stderr;
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				break;
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			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;
				}
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				break;

1113
			case 'v':
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				FrontendProtocol = (ProtocolVersion) atoi(optarg);
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				break;

1117
			case 'x':
1118
#if 0							/* planner/xfunc.h */
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				/*
				 * 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++;
				}
1147
#endif
1148
				break;
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			default:
				/* ----------------
				 *	default: bad command line option
				 * ----------------
				 */
				errs++;
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		}

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

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#ifdef CYR_RECODE
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	SetCharSet();
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#endif

1169
	if (FindExec(pg_pathname, argv[0], "postgres") < 0)
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		elog(FATAL, "%s: could not locate executable, bailing out...",
			 argv[0]);

	if (errs || argc - optind > 1)
	{
		usage(argv[0]);
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		proc_exit(1);
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	}
	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]);
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		proc_exit(1);
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	}

	if (ShowStats &&
		(ShowParserStats || ShowPlannerStats || ShowExecutorStats))
	{
		fprintf(stderr, "-s can not be used together with -t.\n");
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		proc_exit(1);
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	}

	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]);
1201
		proc_exit(1);
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	}

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

	/* ----------------
	 *	print flags
	 * ----------------
	 */
	if (!Quiet)
	{
		puts("\t---debug info---");
		printf("\tQuiet =        %c\n", Quiet ? 't' : 'f');
		printf("\tNoversion =    %c\n", Noversion ? 't' : 'f');
		printf("\ttimings   =    %c\n", ShowStats ? 't' : 'f');
		printf("\tdates     =    %s\n", EuroDates ? "European" : "Normal");
		printf("\tbufsize   =    %d\n", NBuffers);
		printf("\tsortmem   =    %d\n", SortMem);

		printf("\tquery echo =   %c\n", EchoQuery ? 't' : 'f');
		printf("\tDatabaseName = [%s]\n", DBName);
		puts("\t----------------\n");
	}

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	/* ----------------
	 *	set process params for ps
	 * ----------------
	 */
	if (IsUnderPostmaster)
	{
		int i;

		Assert(real_argc >= 4);
		real_argv[1] = userName;
		real_argv[2] = DBName;
		ps_status = (const char **)&real_argv[3];
		*ps_status = "idle";
		for (i = 4; i < real_argc; i++)
			real_argv[i] = "";  /* blank them */
	}
	/* we just put a dummy here so we don't have to test everywhere */
	else	ps_status = malloc(sizeof(char *));

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	/* ----------------
	 *	initialize portal file descriptors
	 * ----------------
	 */
1251
	if (IsUnderPostmaster)
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	{
		if (Portfd < 0)
		{
			fprintf(stderr,
					"Postmaster flag set: no port number specified, use /dev/null\n");
			Portfd = open(NULL_DEV, O_RDWR, 0666);
		}
		pq_init(Portfd);
		whereToSendOutput = Remote;
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	}
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	else
		whereToSendOutput = Debug;

	SetProcessingMode(InitProcessing);

	/* initialize */
	if (!Quiet)
		puts("\tInitPostgres()..");

	InitPostgres(DBName);

1273
#ifdef MULTIBYTE
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	/* set default client encoding */
	if (!Quiet)
	{
		puts("\treset_client_encoding()..");
	}
	reset_client_encoding();
	if (!Quiet)
	{
		puts("\treset_client_encoding() done.");
	}
#endif

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

	pqsignal(SIGINT, QueryCancelHandler);

	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 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(), SIGHUP) to occur sending
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	 *		   us back here.
	 * ----------------
	 */

	pqsignal(SIGHUP, handle_warn);

	if (sigsetjmp(Warn_restart, 1) != 0)
	{
1320
		InError = true;
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		time(&tim);

		if (!Quiet)
			printf("\tAbortCurrentTransaction() at %s\n", ctime(&tim));

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		MemSet(parser_input, 0, MAX_PARSE_BUFFER);
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		AbortCurrentTransaction();
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	}
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	InError = false;
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	/* ----------------
	 *	POSTGRES main processing loop begins here
	 * ----------------
	 */
1339
	if (!IsUnderPostmaster)
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	{
		puts("\nPOSTGRES backend interactive interface");
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		puts("$Revision: 1.81 $ $Date: 1998/07/26 04:30:46 $");
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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
	 * ----------------
	 */
	if (!TransactionFlushEnabled())
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		on_shmem_exit(FlushBufferPool, NULL);
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	for (;;)
	{
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		/* ----------------
		 *	 (0) tell the frontend we're ready for a new query.
		 * ----------------
		 */
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		ReadyForQuery(whereToSendOutput);
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		/* ----------------
		 *	 (1) read a command.
		 * ----------------
		 */
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		MemSet(parser_input, 0, MAX_PARSE_BUFFER);
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		firstchar = ReadCommand(parser_input);
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		QueryCancel = false;

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		/* process the command */
		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 (!Quiet)
				{
					time(&tim);
					printf("\tStartTransactionCommand() at %s\n", ctime(&tim));
				}
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				StartTransactionCommand();
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				HandleFunctionRequest();
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				*ps_status = "idle";
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				break;
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				/* ----------------
				 *	'Q' indicates a user query
				 * ----------------
				 */
			case 'Q':
				fflush(stdout);
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				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 */
					if (!Quiet)
					{
						time(&tim);
						printf("\tStartTransactionCommand() at %s\n", ctime(&tim));
					}
					StartTransactionCommand();
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					pg_exec_query(parser_input);

					*ps_status = "idle";
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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:
1448
				elog(ERROR, "unknown frontend message was received");
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		}

		/* ----------------
		 *	 (3) commit the current transaction
		 *
		 *	 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)
		{
			if (!Quiet)
			{
				time(&tim);
				printf("\tCommitTransactionCommand() at %s\n", ctime(&tim));
			}
			CommitTransactionCommand();

		}
		else
		{
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			if (IsUnderPostmaster)
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				NullCommand(Remote);
		}

	}							/* infinite for-loop */
1475
	proc_exit(0);
1476
	return 1;
1477 1478
}

1479
#ifndef HAVE_GETRUSAGE
1480
#include "rusagestub.h"
1481
#else							/* HAVE_GETRUSAGE */
1482
#include <sys/resource.h>
1483
#endif							/* HAVE_GETRUSAGE */
1484

1485 1486
struct rusage Save_r;
struct timeval Save_t;
1487 1488

void
1489
ResetUsage(void)
1490
{
1491 1492 1493 1494 1495 1496
	struct timezone tz;

	getrusage(RUSAGE_SELF, &Save_r);
	gettimeofday(&Save_t, &tz);
	ResetBufferUsage();
/*	  ResetTupleCount(); */
1497 1498 1499
}

void
1500
ShowUsage(void)
1501
{
1502 1503 1504
	struct timeval user,
				sys;
	struct timeval elapse_t;
1505
	struct timezone tz;
1506
	struct rusage r;
1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551

	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);
1552
#ifdef HAVE_GETRUSAGE
1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581
	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);
#endif							/* HAVE_GETRUSAGE */
	fprintf(StatFp, "! postgres usage stats:\n");
	PrintBufferUsage(StatFp);
/*	   DisplayTupleCount(StatFp); */
1582
}