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2001 lines
48 KiB
C
2001 lines
48 KiB
C
/*-------------------------------------------------------------------------
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*
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* postgres.c
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* POSTGRES C Backend Interface
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*
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.194 2000/12/03 10:27:27 vadim Exp $
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*
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* NOTES
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* this is the "main" module of the postgres backend and
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* hence the main module of the "traffic cop".
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <unistd.h>
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#include <signal.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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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
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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#endif
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#include "access/xlog.h"
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#include "commands/async.h"
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#include "commands/trigger.h"
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#include "commands/variable.h"
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#include "libpq/libpq.h"
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#include "libpq/pqformat.h"
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#include "libpq/pqsignal.h"
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#include "miscadmin.h"
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#include "nodes/print.h"
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#include "optimizer/cost.h"
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#include "optimizer/planner.h"
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#include "parser/analyze.h"
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#include "parser/parse.h"
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#include "parser/parser.h"
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#include "rewrite/rewriteHandler.h"
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#include "tcop/fastpath.h"
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#include "tcop/pquery.h"
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#include "tcop/tcopprot.h"
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#include "tcop/utility.h"
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#include "storage/proc.h"
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#include "utils/exc.h"
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#include "utils/guc.h"
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#include "utils/memutils.h"
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#include "utils/ps_status.h"
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#include "utils/temprel.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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/* ----------------
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* global variables
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* ----------------
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*/
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extern int optind;
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extern char *optarg;
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/*
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* for ps display
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*/
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bool HostnameLookup;
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bool ShowPortNumber;
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bool Log_connections = false;
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CommandDest whereToSendOutput = Debug;
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extern void HandleDeadLock(SIGNAL_ARGS);
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static bool dontExecute = false;
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/* note: these declarations had better match tcopprot.h */
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DLLIMPORT sigjmp_buf Warn_restart;
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bool Warn_restart_ready = false;
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bool InError = false;
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bool ExitAfterAbort = false;
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static bool EchoQuery = false; /* default don't echo */
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char pg_pathname[MAXPGPATH];
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FILE *StatFp = NULL;
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/* ----------------
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* people who want to use EOF should #define DONTUSENEWLINE in
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* tcop/tcopdebug.h
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* ----------------
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*/
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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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** Flags for expensive function optimization -- JMH 3/9/92
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*/
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int XfuncMode = 0;
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/* ----------------------------------------------------------------
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* decls for routines only used in this file
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* ----------------------------------------------------------------
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*/
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static int InteractiveBackend(StringInfo inBuf);
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static int SocketBackend(StringInfo inBuf);
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static int ReadCommand(StringInfo inBuf);
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static List *pg_parse_query(char *query_string, Oid *typev, int nargs);
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static List *pg_analyze_and_rewrite(Node *parsetree);
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static void start_xact_command(void);
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static void finish_xact_command(void);
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static void SigHupHandler(SIGNAL_ARGS);
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static void FloatExceptionHandler(SIGNAL_ARGS);
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static void quickdie(SIGNAL_ARGS);
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/*
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* Flag to mark SIGHUP. Whenever the main loop comes around it
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* will reread the configuration file. (Better than doing the
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* reading in the signal handler, ey?)
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*/
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static volatile bool got_SIGHUP = false;
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/* ----------------------------------------------------------------
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* routines to obtain user input
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* ----------------------------------------------------------------
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*/
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/* ----------------
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* InteractiveBackend() is called for user interactive connections
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* the string entered by the user is placed in its parameter inBuf.
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*
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* EOF is returned if end-of-file input is seen; time to shut down.
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* ----------------
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*/
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static int
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InteractiveBackend(StringInfo inBuf)
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{
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int c; /* character read from getc() */
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bool end = false; /* end-of-input flag */
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bool backslashSeen = false; /* have we seen a \ ? */
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/* ----------------
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* display a prompt and obtain input from the user
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* ----------------
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*/
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printf("backend> ");
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fflush(stdout);
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/* Reset inBuf to empty */
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inBuf->len = 0;
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inBuf->data[0] = '\0';
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for (;;)
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{
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if (UseNewLine)
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{
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/* ----------------
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* if we are using \n as a delimiter, then read
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* characters until the \n.
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* ----------------
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*/
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while ((c = getc(stdin)) != EOF)
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{
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if (c == '\n')
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{
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if (backslashSeen)
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{
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/* discard backslash from inBuf */
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inBuf->data[--inBuf->len] = '\0';
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backslashSeen = false;
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continue;
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}
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else
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{
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/* keep the newline character */
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appendStringInfoChar(inBuf, '\n');
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break;
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}
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}
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else if (c == '\\')
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backslashSeen = true;
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else
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backslashSeen = false;
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appendStringInfoChar(inBuf, (char) c);
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}
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if (c == EOF)
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end = true;
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}
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else
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{
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/* ----------------
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* otherwise read characters until EOF.
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* ----------------
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*/
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while ((c = getc(stdin)) != EOF)
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appendStringInfoChar(inBuf, (char) c);
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if (inBuf->len == 0)
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end = true;
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}
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if (end)
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return EOF;
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/* ----------------
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* otherwise we have a user query so process it.
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* ----------------
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*/
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break;
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}
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/* ----------------
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* if the query echo flag was given, print the query..
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* ----------------
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*/
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if (EchoQuery)
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printf("query: %s\n", inBuf->data);
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fflush(stdout);
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return 'Q';
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}
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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
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* 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
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* the function call is processed in HandleFunctionRequest()
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* (now called from PostgresMain()).
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*
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* EOF is returned if the connection is lost.
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* ----------------
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*/
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static int
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SocketBackend(StringInfo inBuf)
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{
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char qtype;
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char result = '\0';
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/* ----------------
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* get input from the frontend
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* ----------------
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*/
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qtype = '?';
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if (pq_getbytes(&qtype, 1) == EOF)
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return EOF;
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switch (qtype)
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{
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/* ----------------
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* 'Q': user entered a query
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* ----------------
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*/
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case 'Q':
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if (pq_getstr(inBuf))
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return EOF;
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result = 'Q';
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break;
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/* ----------------
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* 'F': calling user/system functions
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* ----------------
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*/
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case 'F':
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if (pq_getstr(inBuf))
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return EOF; /* ignore "string" at start of F message */
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result = 'F';
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break;
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/* ----------------
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* 'X': frontend is exiting
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* ----------------
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*/
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case 'X':
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result = 'X';
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break;
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/* ----------------
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* otherwise we got garbage from the frontend.
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*
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* XXX are we certain that we want to do an elog(FATAL) here?
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* -cim 1/24/90
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* ----------------
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*/
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default:
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elog(FATAL, "Socket command type %c unknown", qtype);
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break;
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}
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return result;
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}
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/* ----------------
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* ReadCommand reads a command from either the frontend or
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* standard input, places it in inBuf, and returns a char
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* representing whether the string is a 'Q'uery or a 'F'astpath
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* call. EOF is returned if end of file.
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* ----------------
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*/
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static int
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ReadCommand(StringInfo inBuf)
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{
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int result;
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if (IsUnderPostmaster)
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result = SocketBackend(inBuf);
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else
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result = InteractiveBackend(inBuf);
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return result;
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}
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/*
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* Parse a query string and pass it through the rewriter.
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*
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* A list of Query nodes is returned, since the string might contain
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* multiple queries and/or the rewriter might expand one query to several.
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*
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* NOTE: this routine is no longer used for processing interactive queries,
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* but it is still needed for parsing of SQL function bodies.
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*/
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List *
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pg_parse_and_rewrite(char *query_string, /* string to execute */
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Oid *typev, /* parameter types */
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int nargs) /* number of parameters */
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{
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List *raw_parsetree_list;
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List *querytree_list;
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List *list_item;
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/* ----------------
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* (1) parse the request string into a list of raw parse trees.
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* ----------------
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*/
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raw_parsetree_list = pg_parse_query(query_string, typev, nargs);
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/* ----------------
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* (2) Do parse analysis and rule rewrite.
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* ----------------
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*/
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querytree_list = NIL;
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foreach(list_item, raw_parsetree_list)
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{
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Node *parsetree = (Node *) lfirst(list_item);
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querytree_list = nconc(querytree_list,
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pg_analyze_and_rewrite(parsetree));
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}
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return querytree_list;
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}
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/*
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* Do raw parsing (only).
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*
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* A list of parsetrees is returned, since there might be multiple
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* commands in the given string.
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*
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* NOTE: for interactive queries, it is important to keep this routine
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* separate from the analysis & rewrite stages. Analysis and rewriting
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* cannot be done in an aborted transaction, since they require access to
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* database tables. So, we rely on the raw parser to determine whether
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* we've seen a COMMIT or ABORT command; when we are in abort state, other
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* commands are not processed any further than the raw parse stage.
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*/
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static List *
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pg_parse_query(char *query_string, Oid *typev, int nargs)
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{
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List *raw_parsetree_list;
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if (Debug_print_query)
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elog(DEBUG, "query: %s", query_string);
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if (Show_parser_stats)
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ResetUsage();
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raw_parsetree_list = parser(query_string, typev, nargs);
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if (Show_parser_stats)
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{
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fprintf(StatFp, "PARSER STATISTICS\n");
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ShowUsage();
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}
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return raw_parsetree_list;
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}
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/*
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* Given a raw parsetree (gram.y output), perform parse analysis and
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* rule rewriting.
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*
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* A list of Query nodes is returned, since either the analyzer or the
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* rewriter might expand one query to several.
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*
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* NOTE: for reasons mentioned above, this must be separate from raw parsing.
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*/
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static List *
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pg_analyze_and_rewrite(Node *parsetree)
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{
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List *querytree_list;
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List *list_item;
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Query *querytree;
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List *new_list;
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/* ----------------
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* (1) Perform parse analysis.
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* ----------------
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*/
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if (Show_parser_stats)
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ResetUsage();
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querytree_list = parse_analyze(parsetree, NULL);
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if (Show_parser_stats)
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{
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fprintf(StatFp, "PARSE ANALYSIS STATISTICS\n");
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ShowUsage();
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ResetUsage();
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}
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/* ----------------
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* (2) Rewrite the queries, as necessary
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*
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* rewritten queries are collected in new_list. Note there may be
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* more or fewer than in the original list.
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* ----------------
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*/
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new_list = NIL;
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foreach(list_item, querytree_list)
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{
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querytree = (Query *) lfirst(list_item);
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if (Debug_print_parse)
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{
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if (Debug_pretty_print)
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{
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elog(DEBUG, "parse tree:");
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nodeDisplay(querytree);
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}
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else
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elog(DEBUG, "parse tree: %s", nodeToString(querytree));
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}
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if (querytree->commandType == CMD_UTILITY)
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{
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/* don't rewrite utilities, just dump 'em into new_list */
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new_list = lappend(new_list, querytree);
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}
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else
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{
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/* rewrite regular queries */
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List *rewritten = QueryRewrite(querytree);
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new_list = nconc(new_list, rewritten);
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}
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}
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querytree_list = new_list;
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if (Show_parser_stats)
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{
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fprintf(StatFp, "REWRITER STATISTICS\n");
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ShowUsage();
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}
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#ifdef COPY_PARSE_PLAN_TREES
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/* Optional debugging check: pass querytree output through copyObject() */
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new_list = (List *) copyObject(querytree_list);
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/* This checks both copyObject() and the equal() routines... */
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if (! equal(new_list, querytree_list))
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elog(NOTICE, "pg_analyze_and_rewrite: copyObject failed on parse tree");
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else
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querytree_list = new_list;
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#endif
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if (Debug_print_rewritten)
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{
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if (Debug_pretty_print)
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{
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elog(DEBUG, "rewritten parse tree:");
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foreach(list_item, querytree_list)
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{
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querytree = (Query *) lfirst(list_item);
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nodeDisplay(querytree);
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printf("\n");
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}
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}
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else
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{
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elog(DEBUG, "rewritten parse tree:");
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foreach(list_item, querytree_list)
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{
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querytree = (Query *) lfirst(list_item);
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elog(DEBUG, "%s", nodeToString(querytree));
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}
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}
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}
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return querytree_list;
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}
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/* Generate a plan for a single query. */
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Plan *
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pg_plan_query(Query *querytree)
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{
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Plan *plan;
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/* Utility commands have no plans. */
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if (querytree->commandType == CMD_UTILITY)
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return NULL;
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if (Show_planner_stats)
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ResetUsage();
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/* call that optimizer */
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plan = planner(querytree);
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if (Show_planner_stats)
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{
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fprintf(stderr, "PLANNER STATISTICS\n");
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ShowUsage();
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}
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#ifdef COPY_PARSE_PLAN_TREES
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/* Optional debugging check: pass plan output through copyObject() */
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{
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Plan *new_plan = (Plan *) copyObject(plan);
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/* equal() currently does not have routines to compare Plan nodes,
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* so don't try to test equality here. Perhaps fix someday?
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*/
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#ifdef NOT_USED
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/* This checks both copyObject() and the equal() routines... */
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if (! equal(new_plan, plan))
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elog(NOTICE, "pg_plan_query: copyObject failed on plan tree");
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else
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#endif
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plan = new_plan;
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}
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#endif
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/* ----------------
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* Print plan if debugging.
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* ----------------
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*/
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if (Debug_print_plan)
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{
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if (Debug_pretty_print)
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{
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elog(DEBUG, "plan:");
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nodeDisplay(plan);
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}
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else
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elog(DEBUG, "plan: %s", nodeToString(plan));
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}
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return plan;
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}
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/* ----------------------------------------------------------------
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* pg_exec_query_string()
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*
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* Takes a querystring, runs the parser/utilities or
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* parser/planner/executor over it as necessary.
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*
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* Assumptions:
|
|
*
|
|
* At call, we are not inside a transaction command.
|
|
*
|
|
* The CurrentMemoryContext after starting a transaction command must be
|
|
* appropriate for execution of individual queries (typically this will be
|
|
* TransactionCommandContext). Note that this routine resets that context
|
|
* after each individual query, so don't store anything there that
|
|
* must outlive the call!
|
|
*
|
|
* parse_context references a context suitable for holding the
|
|
* parse/rewrite trees (typically this will be QueryContext).
|
|
* This context *must* be longer-lived than the transaction context!
|
|
* In fact, if the query string might contain BEGIN/COMMIT commands,
|
|
* parse_context had better outlive TopTransactionContext!
|
|
*
|
|
* We could have hard-wired knowledge about QueryContext and
|
|
* TransactionCommandContext into this routine, but it seems better
|
|
* not to, in case callers from outside this module need to use some
|
|
* other contexts.
|
|
*
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
|
|
void
|
|
pg_exec_query_string(char *query_string, /* string to execute */
|
|
CommandDest dest, /* where results should go */
|
|
MemoryContext parse_context) /* context for parsetrees */
|
|
{
|
|
bool xact_started;
|
|
MemoryContext oldcontext;
|
|
List *parsetree_list,
|
|
*parsetree_item;
|
|
|
|
/*
|
|
* Start up a transaction command. All queries generated by the
|
|
* query_string will be in this same command block, *unless* we find
|
|
* a BEGIN/COMMIT/ABORT statement; we have to force a new xact command
|
|
* after one of those, else bad things will happen in xact.c.
|
|
* (Note that this will possibly change current memory context.)
|
|
*/
|
|
start_xact_command();
|
|
xact_started = true;
|
|
|
|
/*
|
|
* parse_context *must* be different from the execution memory context,
|
|
* else the context reset at the bottom of the loop will destroy the
|
|
* parsetree list. (We really ought to check that parse_context isn't a
|
|
* child of CurrentMemoryContext either, but that would take more cycles
|
|
* than it's likely to be worth.)
|
|
*/
|
|
Assert(parse_context != CurrentMemoryContext);
|
|
|
|
/*
|
|
* Switch to appropriate context for constructing parsetrees.
|
|
*/
|
|
oldcontext = MemoryContextSwitchTo(parse_context);
|
|
|
|
/*
|
|
* Do basic parsing of the query or queries (this should be safe
|
|
* even if we are in aborted transaction state!)
|
|
*/
|
|
parsetree_list = pg_parse_query(query_string, NULL, 0);
|
|
|
|
/*
|
|
* Switch back to execution context to enter the loop.
|
|
*/
|
|
MemoryContextSwitchTo(oldcontext);
|
|
|
|
/*
|
|
* Run through the parsetree(s) and process each one.
|
|
*/
|
|
foreach(parsetree_item, parsetree_list)
|
|
{
|
|
Node *parsetree = (Node *) lfirst(parsetree_item);
|
|
bool isTransactionStmt;
|
|
List *querytree_list,
|
|
*querytree_item;
|
|
|
|
/* Transaction control statements need some special handling */
|
|
isTransactionStmt = IsA(parsetree, TransactionStmt);
|
|
|
|
/*
|
|
* If we are in an aborted transaction, ignore all commands except
|
|
* COMMIT/ABORT. It is important that this test occur before we
|
|
* try to do parse analysis, rewrite, or planning, since all those
|
|
* phases try to do database accesses, which may fail in abort state.
|
|
* (It might be safe to allow some additional utility commands in
|
|
* this state, but not many...)
|
|
*/
|
|
if (IsAbortedTransactionBlockState())
|
|
{
|
|
bool allowit = false;
|
|
|
|
if (isTransactionStmt)
|
|
{
|
|
TransactionStmt *stmt = (TransactionStmt *) parsetree;
|
|
|
|
switch (stmt->command)
|
|
{
|
|
case COMMIT:
|
|
case ROLLBACK:
|
|
allowit = true;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (! allowit)
|
|
{
|
|
/* ----------------
|
|
* the EndCommand() stuff is to tell the frontend
|
|
* that the command ended. -cim 6/1/90
|
|
* ----------------
|
|
*/
|
|
char *tag = "*ABORT STATE*";
|
|
|
|
elog(NOTICE, "current transaction is aborted, "
|
|
"queries ignored until end of transaction block");
|
|
|
|
EndCommand(tag, dest);
|
|
|
|
/*
|
|
* We continue in the loop, on the off chance that there
|
|
* is a COMMIT or ROLLBACK utility command later in the
|
|
* query string.
|
|
*/
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Make sure we are in a transaction command */
|
|
if (! xact_started)
|
|
{
|
|
start_xact_command();
|
|
xact_started = true;
|
|
}
|
|
|
|
/* If we got a cancel signal in parsing or prior command, quit */
|
|
if (QueryCancel)
|
|
CancelQuery();
|
|
|
|
/*
|
|
* OK to analyze and rewrite this query.
|
|
*
|
|
* Switch to appropriate context for constructing querytrees
|
|
* (again, these must outlive the execution context).
|
|
*/
|
|
oldcontext = MemoryContextSwitchTo(parse_context);
|
|
|
|
querytree_list = pg_analyze_and_rewrite(parsetree);
|
|
|
|
/*
|
|
* Switch back to execution context for planning and execution.
|
|
*/
|
|
MemoryContextSwitchTo(oldcontext);
|
|
|
|
/*
|
|
* Inner loop handles the individual queries generated from a
|
|
* single parsetree by analysis and rewrite.
|
|
*/
|
|
foreach(querytree_item, querytree_list)
|
|
{
|
|
Query *querytree = (Query *) lfirst(querytree_item);
|
|
|
|
/* Make sure we are in a transaction command */
|
|
if (! xact_started)
|
|
{
|
|
start_xact_command();
|
|
xact_started = true;
|
|
}
|
|
|
|
/* If we got a cancel signal in analysis or prior command, quit */
|
|
if (QueryCancel)
|
|
CancelQuery();
|
|
|
|
if (querytree->commandType == CMD_UTILITY)
|
|
{
|
|
/* ----------------
|
|
* process utility functions (create, destroy, etc..)
|
|
* ----------------
|
|
*/
|
|
if (Debug_print_query)
|
|
elog(DEBUG, "ProcessUtility: %s", query_string);
|
|
else if (DebugLvl > 1)
|
|
elog(DEBUG, "ProcessUtility");
|
|
|
|
ProcessUtility(querytree->utilityStmt, dest);
|
|
}
|
|
else
|
|
{
|
|
/* ----------------
|
|
* process a plannable query.
|
|
* ----------------
|
|
*/
|
|
Plan *plan;
|
|
|
|
plan = pg_plan_query(querytree);
|
|
|
|
/* if we got a cancel signal whilst planning, quit */
|
|
if (QueryCancel)
|
|
CancelQuery();
|
|
|
|
/* Initialize snapshot state for query */
|
|
SetQuerySnapshot();
|
|
|
|
/*
|
|
* execute the plan
|
|
*/
|
|
if (Show_executor_stats)
|
|
ResetUsage();
|
|
|
|
if (dontExecute)
|
|
{
|
|
/* don't execute it, just show the query plan */
|
|
print_plan(plan, querytree);
|
|
}
|
|
else
|
|
{
|
|
if (DebugLvl > 1)
|
|
elog(DEBUG, "ProcessQuery");
|
|
ProcessQuery(querytree, plan, dest);
|
|
}
|
|
|
|
if (Show_executor_stats)
|
|
{
|
|
fprintf(stderr, "EXECUTOR STATISTICS\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. In particular we'd better
|
|
* do so before checking constraints.
|
|
*/
|
|
if (!isTransactionStmt)
|
|
CommandCounterIncrement();
|
|
|
|
/*
|
|
* Clear the execution context to recover temporary
|
|
* memory used by the query. NOTE: if query string contains
|
|
* BEGIN/COMMIT transaction commands, execution context may
|
|
* now be different from what we were originally passed;
|
|
* so be careful to clear current context not "oldcontext".
|
|
*/
|
|
Assert(parse_context != CurrentMemoryContext);
|
|
|
|
MemoryContextResetAndDeleteChildren(CurrentMemoryContext);
|
|
|
|
/*
|
|
* If this was a transaction control statement, commit it
|
|
* and arrange to start a new xact command for the next
|
|
* command (if any).
|
|
*/
|
|
if (isTransactionStmt)
|
|
{
|
|
finish_xact_command();
|
|
xact_started = false;
|
|
}
|
|
|
|
} /* end loop over queries generated from a parsetree */
|
|
} /* end loop over parsetrees */
|
|
|
|
/*
|
|
* Close down transaction statement, if one is open.
|
|
*/
|
|
if (xact_started)
|
|
finish_xact_command();
|
|
}
|
|
|
|
/*
|
|
* Convenience routines for starting/committing a single command.
|
|
*/
|
|
static void
|
|
start_xact_command(void)
|
|
{
|
|
if (DebugLvl >= 1)
|
|
elog(DEBUG, "StartTransactionCommand");
|
|
StartTransactionCommand();
|
|
}
|
|
|
|
static void
|
|
finish_xact_command(void)
|
|
{
|
|
/* Invoke IMMEDIATE constraint triggers */
|
|
DeferredTriggerEndQuery();
|
|
|
|
/* Now commit the command */
|
|
if (DebugLvl >= 1)
|
|
elog(DEBUG, "CommitTransactionCommand");
|
|
set_ps_display("commit"); /* XXX probably the wrong place to do this */
|
|
CommitTransactionCommand();
|
|
|
|
#ifdef SHOW_MEMORY_STATS
|
|
/* Print mem stats at each commit for leak tracking */
|
|
if (ShowStats)
|
|
MemoryContextStats(TopMemoryContext);
|
|
#endif
|
|
}
|
|
|
|
|
|
/* --------------------------------
|
|
* signal handler routines used in PostgresMain()
|
|
*
|
|
* handle_warn() catches SIGQUIT. It forces control back to the main
|
|
* loop, just as if an internal error (elog(ERROR,...)) had occurred.
|
|
* elog() used to actually use kill(2) to induce a SIGQUIT to get here!
|
|
* But that's not 100% reliable on some systems, so now it does its own
|
|
* siglongjmp() instead.
|
|
* We still provide the signal catcher so that an error quit can be
|
|
* forced externally. This should be done only with great caution,
|
|
* however, since an asynchronous signal could leave the system in
|
|
* who-knows-what inconsistent state.
|
|
*
|
|
* quickdie() occurs when signalled by the postmaster.
|
|
* Some backend has bought the farm,
|
|
* so we need to stop what we're doing and exit.
|
|
*
|
|
* die() performs an orderly cleanup via proc_exit()
|
|
* --------------------------------
|
|
*/
|
|
|
|
void
|
|
handle_warn(SIGNAL_ARGS)
|
|
{
|
|
if (StopIfError)
|
|
{
|
|
QueryCancel = true;
|
|
return;
|
|
}
|
|
siglongjmp(Warn_restart, 1);
|
|
}
|
|
|
|
static void
|
|
quickdie(SIGNAL_ARGS)
|
|
{
|
|
PG_SETMASK(&BlockSig);
|
|
elog(NOTICE, "Message from PostgreSQL backend:"
|
|
"\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.");
|
|
|
|
|
|
/*
|
|
* DO NOT proc_exit(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(1);
|
|
}
|
|
|
|
/*
|
|
* Abort transaction and exit
|
|
*/
|
|
void
|
|
die(SIGNAL_ARGS)
|
|
{
|
|
PG_SETMASK(&BlockSig);
|
|
|
|
ExitAfterAbort = true;
|
|
if (StopIfError)
|
|
{
|
|
QueryCancel = true;
|
|
return;
|
|
}
|
|
if (InError) /* If ERROR/FATAL is in progress... */
|
|
return;
|
|
elog(FATAL, "The system is shutting down");
|
|
}
|
|
|
|
/* signal handler for floating point exception */
|
|
static void
|
|
FloatExceptionHandler(SIGNAL_ARGS)
|
|
{
|
|
elog(ERROR, "floating point exception!"
|
|
" The last floating point operation either exceeded legal ranges"
|
|
" or was a divide by zero");
|
|
}
|
|
|
|
/* signal handler for query cancel signal from postmaster */
|
|
static void
|
|
QueryCancelHandler(SIGNAL_ARGS)
|
|
{
|
|
QueryCancel = true;
|
|
LockWaitCancel();
|
|
}
|
|
|
|
void
|
|
CancelQuery(void)
|
|
{
|
|
|
|
/*
|
|
* QueryCancel flag will be reset in main loop, which we reach by
|
|
* longjmp from elog().
|
|
*/
|
|
elog(ERROR, "Query was cancelled.");
|
|
}
|
|
|
|
static void
|
|
SigHupHandler(SIGNAL_ARGS)
|
|
{
|
|
got_SIGHUP = true;
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
usage(char *progname)
|
|
{
|
|
printf("%s is the PostgreSQL stand-alone backend. It is not\nintended to be used by normal users.\n\n", progname);
|
|
|
|
printf("Usage:\n %s [options...] [dbname]\n\n", progname);
|
|
printf("Options:\n");
|
|
#ifdef USE_ASSERT_CHECKING
|
|
printf(" -A 1|0 enable/disable run-time assert checking\n");
|
|
#endif
|
|
printf(" -B NBUFFERS number of shared buffers (default %d)\n", DEF_NBUFFERS);
|
|
printf(" -c NAME=VALUE set run-time parameter\n");
|
|
printf(" -d 1-5 debugging level\n");
|
|
printf(" -D DATADIR database directory\n");
|
|
printf(" -e use European date format\n");
|
|
printf(" -E echo query before execution\n");
|
|
printf(" -F turn fsync off\n");
|
|
printf(" -N do not use newline as interactive query delimiter\n");
|
|
printf(" -o FILENAME send stdout and stderr to given file\n");
|
|
printf(" -P disable system indexes\n");
|
|
printf(" -s show statistics after each query\n");
|
|
printf(" -S SORT-MEM set amount of memory for sorts (in kbytes)\n");
|
|
printf("Developer options:\n");
|
|
printf(" -f [s|i|n|m|h] forbid use of some plan types\n");
|
|
printf(" -i do not execute queries\n");
|
|
printf(" -L turn off locking\n");
|
|
printf(" -O allow system table structure changes\n");
|
|
printf(" -t [pa|pl|ex] show timings after each query\n");
|
|
printf(" -W NUM wait NUM seconds to allow attach from a debugger\n");
|
|
printf("\nReport bugs to <pgsql-bugs@postgresql.org>.\n");
|
|
}
|
|
|
|
|
|
|
|
/* ----------------------------------------------------------------
|
|
* PostgresMain
|
|
* postgres main loop -- all backends, interactive or otherwise start here
|
|
*
|
|
* argc/argv are the command line arguments to be used. When being forked
|
|
* by the postmaster, these are not the original argv array of the process.
|
|
* real_argc/real_argv point to the original argv array, which is needed by
|
|
* `ps' display on some platforms. username is the (possibly authenticated)
|
|
* PostgreSQL user name to be used for the session.
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
int
|
|
PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[], const char * username)
|
|
{
|
|
int flag;
|
|
|
|
const char *DBName = NULL;
|
|
bool secure = true;
|
|
int errs = 0;
|
|
|
|
int firstchar;
|
|
StringInfo parser_input;
|
|
|
|
char *remote_host;
|
|
unsigned short remote_port;
|
|
|
|
char *potential_DataDir = NULL;
|
|
|
|
/*
|
|
* Catch standard options before doing much else. This even works
|
|
* on systems without getopt_long.
|
|
*/
|
|
if (!IsUnderPostmaster && argc > 1)
|
|
{
|
|
if (strcmp(argv[1], "--help")==0 || strcmp(argv[1], "-?")==0)
|
|
{
|
|
usage(argv[0]);
|
|
exit(0);
|
|
}
|
|
if (strcmp(argv[1], "--version")==0 || strcmp(argv[1], "-V")==0)
|
|
{
|
|
puts("postgres (PostgreSQL) " PG_VERSION);
|
|
exit(0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Fire up essential subsystems: error and memory management
|
|
*
|
|
* If we are running under the postmaster, this is done already.
|
|
*/
|
|
if (!IsUnderPostmaster)
|
|
{
|
|
EnableExceptionHandling(true);
|
|
MemoryContextInit();
|
|
}
|
|
|
|
/*
|
|
* Set default values for command-line options.
|
|
*/
|
|
Noversion = false;
|
|
EchoQuery = false;
|
|
|
|
if (!IsUnderPostmaster)
|
|
{
|
|
ResetAllOptions();
|
|
potential_DataDir = getenv("PGDATA");
|
|
}
|
|
StatFp = stderr;
|
|
|
|
SetProcessingMode(InitProcessing);
|
|
|
|
/* Check for PGDATESTYLE environment variable */
|
|
set_default_datestyle();
|
|
|
|
/* ----------------
|
|
* parse command line arguments
|
|
*
|
|
* There are now two styles of command line layout for the backend:
|
|
*
|
|
* For interactive use (not started from postmaster) the format is
|
|
* postgres [switches] [databasename]
|
|
* If the databasename is omitted it is taken to be the user name.
|
|
*
|
|
* When started from the postmaster, the format is
|
|
* postgres [secure switches] -p databasename [insecure switches]
|
|
* Switches appearing after -p came from the client (via "options"
|
|
* field of connection request). For security reasons we restrict
|
|
* what these switches can do.
|
|
* ----------------
|
|
*/
|
|
|
|
optind = 1; /* reset after postmaster's usage */
|
|
|
|
while ((flag = getopt(argc, argv, "A:B:c:CD:d:Eef:FiLNOPo:p:S:st:v:W:x:-:")) != EOF)
|
|
switch (flag)
|
|
{
|
|
case 'A':
|
|
#ifdef USE_ASSERT_CHECKING
|
|
assert_enabled = atoi(optarg);
|
|
#else
|
|
fprintf(stderr, "Assert checking is not compiled in\n");
|
|
#endif
|
|
break;
|
|
|
|
case 'B':
|
|
/* ----------------
|
|
* specify the size of buffer pool
|
|
* ----------------
|
|
*/
|
|
if (secure)
|
|
NBuffers = atoi(optarg);
|
|
break;
|
|
|
|
case 'C':
|
|
/* ----------------
|
|
* don't print version string
|
|
* ----------------
|
|
*/
|
|
Noversion = true;
|
|
break;
|
|
|
|
case 'D': /* PGDATA directory */
|
|
if (secure)
|
|
{
|
|
potential_DataDir = optarg;
|
|
}
|
|
break;
|
|
|
|
case 'd': /* debug level */
|
|
DebugLvl = atoi(optarg);
|
|
if (DebugLvl >= 1);
|
|
Log_connections = true;
|
|
if (DebugLvl >= 2)
|
|
Debug_print_query = true;
|
|
if (DebugLvl >= 3)
|
|
Debug_print_parse = true;
|
|
if (DebugLvl >= 4)
|
|
Debug_print_plan = true;
|
|
if (DebugLvl >= 5)
|
|
Debug_print_rewritten = true;
|
|
break;
|
|
|
|
case 'E':
|
|
/* ----------------
|
|
* E - echo the query the user entered
|
|
* ----------------
|
|
*/
|
|
EchoQuery = true;
|
|
break;
|
|
|
|
case 'e':
|
|
/* --------------------------
|
|
* Use european date formats.
|
|
* --------------------------
|
|
*/
|
|
EuroDates = true;
|
|
break;
|
|
|
|
case 'F':
|
|
/* --------------------
|
|
* turn off fsync
|
|
*
|
|
* 7.0 buffer manager can support different backends running
|
|
* with different fsync settings, so this no longer needs
|
|
* to be "if (secure)".
|
|
* --------------------
|
|
*/
|
|
enableFsync = false;
|
|
break;
|
|
|
|
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 't': /* tidscan */
|
|
enable_tidscan = false;
|
|
break;
|
|
case 'n': /* nestloop */
|
|
enable_nestloop = false;
|
|
break;
|
|
case 'm': /* mergejoin */
|
|
enable_mergejoin = false;
|
|
break;
|
|
case 'h': /* hashjoin */
|
|
enable_hashjoin = false;
|
|
break;
|
|
default:
|
|
errs++;
|
|
}
|
|
break;
|
|
|
|
case 'i':
|
|
dontExecute = true;
|
|
break;
|
|
|
|
case 'L':
|
|
/* --------------------
|
|
* turn off locking
|
|
* --------------------
|
|
*/
|
|
if (secure)
|
|
lockingOff = 1;
|
|
break;
|
|
|
|
case 'N':
|
|
/* ----------------
|
|
* N - Don't use newline as a query delimiter
|
|
* ----------------
|
|
*/
|
|
UseNewLine = 0;
|
|
break;
|
|
|
|
case 'O':
|
|
/* --------------------
|
|
* allow system table structure modifications
|
|
* --------------------
|
|
*/
|
|
if (secure) /* XXX safe to allow from client??? */
|
|
allowSystemTableMods = true;
|
|
break;
|
|
|
|
case 'P':
|
|
/* --------------------
|
|
* ignore system indexes
|
|
* --------------------
|
|
*/
|
|
if (secure) /* XXX safe to allow from client??? */
|
|
IgnoreSystemIndexes(true);
|
|
break;
|
|
|
|
case 'o':
|
|
/* ----------------
|
|
* o - send output (stdout and stderr) to the given file
|
|
* ----------------
|
|
*/
|
|
if (secure)
|
|
StrNCpy(OutputFileName, optarg, MAXPGPATH);
|
|
break;
|
|
|
|
case 'p':
|
|
/* ----------------
|
|
* p - special flag passed if backend was forked
|
|
* by a postmaster.
|
|
* ----------------
|
|
*/
|
|
if (secure)
|
|
{
|
|
DBName = strdup(optarg);
|
|
secure = false; /* subsequent switches are NOT
|
|
* secure */
|
|
}
|
|
break;
|
|
|
|
case 'S':
|
|
/* ----------------
|
|
* S - amount of sort memory to use in 1k bytes
|
|
* ----------------
|
|
*/
|
|
{
|
|
int S;
|
|
|
|
S = atoi(optarg);
|
|
if (S >= 4 * BLCKSZ / 1024)
|
|
SortMem = S;
|
|
}
|
|
break;
|
|
|
|
case 's':
|
|
/* ----------------
|
|
* s - report usage statistics (timings) after each query
|
|
* ----------------
|
|
*/
|
|
Show_query_stats = 1;
|
|
break;
|
|
|
|
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.
|
|
* ----------------
|
|
*/
|
|
switch (optarg[0])
|
|
{
|
|
case 'p':
|
|
if (optarg[1] == 'a')
|
|
Show_parser_stats = 1;
|
|
else if (optarg[1] == 'l')
|
|
Show_planner_stats = 1;
|
|
else
|
|
errs++;
|
|
break;
|
|
case 'e':
|
|
Show_executor_stats = 1;
|
|
break;
|
|
default:
|
|
errs++;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case 'v':
|
|
if (secure)
|
|
FrontendProtocol = (ProtocolVersion) atoi(optarg);
|
|
break;
|
|
|
|
case 'W':
|
|
/* ----------------
|
|
* wait N seconds to allow attach from a debugger
|
|
* ----------------
|
|
*/
|
|
sleep(atoi(optarg));
|
|
break;
|
|
|
|
case 'x':
|
|
#ifdef NOT_USED /* planner/xfunc.h */
|
|
|
|
/*
|
|
* 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++;
|
|
}
|
|
#endif
|
|
break;
|
|
|
|
case 'c':
|
|
case '-':
|
|
{
|
|
char *name, *value;
|
|
|
|
ParseLongOption(optarg, &name, &value);
|
|
if (!value)
|
|
{
|
|
if (flag == '-')
|
|
elog(ERROR, "--%s requires argument", optarg);
|
|
else
|
|
elog(ERROR, "-c %s requires argument", optarg);
|
|
}
|
|
|
|
/* all options are allowed if not under postmaster */
|
|
SetConfigOption(name, value,
|
|
(IsUnderPostmaster) ? PGC_BACKEND : PGC_POSTMASTER);
|
|
free(name);
|
|
if (value)
|
|
free(value);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
errs++;
|
|
break;
|
|
}
|
|
|
|
|
|
if (Show_query_stats &&
|
|
(Show_parser_stats || Show_planner_stats || Show_executor_stats))
|
|
{
|
|
elog(NOTICE, "Query statistics are disabled because parser, planner, or executor statistics are on.");
|
|
Show_query_stats = false;
|
|
}
|
|
|
|
if (!IsUnderPostmaster)
|
|
{
|
|
if (!potential_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]);
|
|
proc_exit(1);
|
|
}
|
|
SetDataDir(potential_DataDir);
|
|
}
|
|
Assert(DataDir);
|
|
|
|
/*
|
|
* 1. Set BlockSig and UnBlockSig masks. 2. Set up signal handlers. 3.
|
|
* Allow only SIGUSR1 signal (we never block it) during
|
|
* initialization.
|
|
*
|
|
* Note that postmaster already blocked ALL signals to make us happy.
|
|
*/
|
|
pqinitmask();
|
|
|
|
#ifdef HAVE_SIGPROCMASK
|
|
sigdelset(&BlockSig, SIGUSR1);
|
|
#else
|
|
BlockSig &= ~(sigmask(SIGUSR1));
|
|
#endif
|
|
|
|
PG_SETMASK(&BlockSig); /* block everything except SIGUSR1 */
|
|
|
|
pqsignal(SIGHUP, SigHupHandler); /* set flag to read config file */
|
|
pqsignal(SIGINT, QueryCancelHandler); /* cancel current query */
|
|
pqsignal(SIGQUIT, handle_warn); /* handle error */
|
|
pqsignal(SIGTERM, die);
|
|
pqsignal(SIGALRM, HandleDeadLock);
|
|
|
|
/*
|
|
* 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...
|
|
*/
|
|
pqsignal(SIGPIPE, SIG_IGN);
|
|
pqsignal(SIGUSR1, quickdie);
|
|
pqsignal(SIGUSR2, Async_NotifyHandler); /* flush also sinval cache */
|
|
pqsignal(SIGFPE, FloatExceptionHandler);
|
|
pqsignal(SIGCHLD, SIG_IGN); /* ignored, sent by LockOwners */
|
|
pqsignal(SIGTTIN, SIG_DFL);
|
|
pqsignal(SIGTTOU, SIG_DFL);
|
|
pqsignal(SIGCONT, SIG_DFL);
|
|
|
|
|
|
if (IsUnderPostmaster)
|
|
{
|
|
/* noninteractive case: nothing should be left after switches */
|
|
if (errs || argc != optind || DBName == NULL)
|
|
{
|
|
fprintf(stderr, "%s: invalid command line arguments\nTry -? for help.\n", argv[0]);
|
|
proc_exit(1);
|
|
}
|
|
pq_init(); /* initialize libpq at backend startup */
|
|
whereToSendOutput = Remote;
|
|
BaseInit();
|
|
}
|
|
else
|
|
{
|
|
/* interactive case: database name can be last arg on command line */
|
|
whereToSendOutput = Debug;
|
|
if (errs || argc - optind > 1)
|
|
{
|
|
fprintf(stderr, "%s: invalid command line arguments\nTry -? for help.\n", argv[0]);
|
|
proc_exit(1);
|
|
}
|
|
else if (argc - optind == 1)
|
|
DBName = argv[optind];
|
|
else if ((DBName = username) == NULL)
|
|
{
|
|
fprintf(stderr, "%s: user name undefined and no database specified\n",
|
|
argv[0]);
|
|
proc_exit(1);
|
|
}
|
|
|
|
/*
|
|
* Create lockfile for data directory.
|
|
*/
|
|
if (! CreateDataDirLockFile(DataDir, false))
|
|
proc_exit(1);
|
|
|
|
XLOGPathInit();
|
|
BaseInit();
|
|
StartupXLOG();
|
|
}
|
|
|
|
/*
|
|
* Set up additional info.
|
|
*/
|
|
|
|
#ifdef CYR_RECODE
|
|
SetCharSet();
|
|
#endif
|
|
|
|
/* On some systems our dynloader code needs the executable's pathname */
|
|
if (FindExec(pg_pathname, real_argv[0], "postgres") < 0)
|
|
elog(FATAL, "%s: could not locate executable, bailing out...",
|
|
real_argv[0]);
|
|
|
|
/*
|
|
* Find remote host name or address.
|
|
*/
|
|
remote_host = NULL;
|
|
|
|
if (IsUnderPostmaster)
|
|
{
|
|
if (MyProcPort->raddr.sa.sa_family == AF_INET)
|
|
{
|
|
struct hostent *host_ent;
|
|
char * host_addr;
|
|
|
|
remote_port = ntohs(MyProcPort->raddr.in.sin_port);
|
|
host_addr = inet_ntoa(MyProcPort->raddr.in.sin_addr);
|
|
|
|
if (HostnameLookup)
|
|
{
|
|
host_ent = gethostbyaddr((char *) &MyProcPort->raddr.in.sin_addr, sizeof(MyProcPort->raddr.in.sin_addr), AF_INET);
|
|
|
|
if (host_ent)
|
|
{
|
|
remote_host = palloc(strlen(host_addr) + strlen(host_ent->h_name) + 3);
|
|
sprintf(remote_host, "%s[%s]", host_ent->h_name, host_addr);
|
|
}
|
|
}
|
|
|
|
if (remote_host == NULL)
|
|
remote_host = pstrdup(host_addr);
|
|
|
|
if (ShowPortNumber)
|
|
{
|
|
char * str = palloc(strlen(remote_host) + 7);
|
|
sprintf(str, "%s:%hu", remote_host, remote_port);
|
|
pfree(remote_host);
|
|
remote_host = str;
|
|
}
|
|
}
|
|
else /* not AF_INET */
|
|
remote_host = "[local]";
|
|
|
|
|
|
/*
|
|
* Set process parameters for ps
|
|
*
|
|
* WARNING: On some platforms the environment will be moved
|
|
* around to make room for the ps display string. So any
|
|
* references to optarg or getenv() from above will be invalid
|
|
* after this call. Better use strdup or something similar.
|
|
*/
|
|
init_ps_display(real_argc, real_argv, username, DBName, remote_host);
|
|
set_ps_display("startup");
|
|
}
|
|
|
|
if (Log_connections)
|
|
elog(DEBUG, "connection: host=%s user=%s database=%s",
|
|
remote_host, username, DBName);
|
|
|
|
/*
|
|
* general initialization
|
|
*/
|
|
if (DebugLvl > 1)
|
|
elog(DEBUG, "InitPostgres");
|
|
InitPostgres(DBName, username);
|
|
|
|
#ifdef MULTIBYTE
|
|
/* set default client encoding */
|
|
if (DebugLvl > 1)
|
|
elog(DEBUG, "set_default_client_encoding");
|
|
set_default_client_encoding();
|
|
#endif
|
|
|
|
on_shmem_exit(remove_all_temp_relations, 0);
|
|
|
|
/*
|
|
* Send this backend's cancellation info to the frontend.
|
|
*/
|
|
if (whereToSendOutput == Remote &&
|
|
PG_PROTOCOL_MAJOR(FrontendProtocol) >= 2)
|
|
{
|
|
StringInfoData buf;
|
|
|
|
pq_beginmessage(&buf);
|
|
pq_sendbyte(&buf, 'K');
|
|
pq_sendint(&buf, (int32) MyProcPid, sizeof(int32));
|
|
pq_sendint(&buf, (int32) MyCancelKey, sizeof(int32));
|
|
pq_endmessage(&buf);
|
|
/* Need not flush since ReadyForQuery will do it. */
|
|
}
|
|
|
|
if (!IsUnderPostmaster)
|
|
{
|
|
puts("\nPOSTGRES backend interactive interface ");
|
|
puts("$Revision: 1.194 $ $Date: 2000/12/03 10:27:27 $\n");
|
|
}
|
|
|
|
/*
|
|
* Initialize the deferred trigger manager
|
|
*/
|
|
if (DeferredTriggerInit() != 0)
|
|
goto normalexit;
|
|
|
|
SetProcessingMode(NormalProcessing);
|
|
|
|
/*
|
|
* Create the memory context we will use in the main loop.
|
|
*
|
|
* QueryContext is reset once per iteration of the main loop,
|
|
* ie, upon completion of processing of each supplied query string.
|
|
* It can therefore be used for any data that should live just as
|
|
* long as the query string --- parse trees, for example.
|
|
*/
|
|
QueryContext = AllocSetContextCreate(TopMemoryContext,
|
|
"QueryContext",
|
|
ALLOCSET_DEFAULT_MINSIZE,
|
|
ALLOCSET_DEFAULT_INITSIZE,
|
|
ALLOCSET_DEFAULT_MAXSIZE);
|
|
|
|
/*
|
|
* POSTGRES main processing loop begins here
|
|
*
|
|
* If an exception is encountered, processing resumes here so we abort
|
|
* the current transaction and start a new one.
|
|
*/
|
|
|
|
if (sigsetjmp(Warn_restart, 1) != 0)
|
|
{
|
|
/*
|
|
* Make sure we are in a valid memory context during recovery.
|
|
*
|
|
* We use ErrorContext in hopes that it will have some free space
|
|
* even if we're otherwise up against it...
|
|
*/
|
|
MemoryContextSwitchTo(ErrorContext);
|
|
|
|
if (DebugLvl >= 1)
|
|
elog(DEBUG, "AbortCurrentTransaction");
|
|
AbortCurrentTransaction();
|
|
|
|
if (ExitAfterAbort)
|
|
goto errorexit;
|
|
|
|
/*
|
|
* If we recovered successfully, return to normal top-level context
|
|
* and clear ErrorContext for next time.
|
|
*/
|
|
MemoryContextSwitchTo(TopMemoryContext);
|
|
MemoryContextResetAndDeleteChildren(ErrorContext);
|
|
InError = false;
|
|
}
|
|
|
|
Warn_restart_ready = true; /* we can now handle elog(ERROR) */
|
|
|
|
PG_SETMASK(&UnBlockSig);
|
|
|
|
/*
|
|
* Non-error queries loop here.
|
|
*/
|
|
|
|
for (;;)
|
|
{
|
|
/*
|
|
* Release storage left over from prior query cycle, and
|
|
* create a new query input buffer in the cleared QueryContext.
|
|
*/
|
|
MemoryContextSwitchTo(QueryContext);
|
|
MemoryContextResetAndDeleteChildren(QueryContext);
|
|
|
|
parser_input = makeStringInfo();
|
|
|
|
/* ----------------
|
|
* (1) tell the frontend we're ready for a new query.
|
|
*
|
|
* Note: this includes fflush()'ing the last of the prior output.
|
|
* ----------------
|
|
*/
|
|
ReadyForQuery(whereToSendOutput);
|
|
|
|
/* ----------------
|
|
* (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 */
|
|
SetWaitingForLock(false);
|
|
|
|
EnableNotifyInterrupt();
|
|
|
|
/* ----------------
|
|
* (3) read a command (loop blocks here)
|
|
* ----------------
|
|
*/
|
|
set_ps_display("idle");
|
|
|
|
firstchar = ReadCommand(parser_input);
|
|
|
|
QueryCancel = false; /* forget any earlier CANCEL signal */
|
|
|
|
/* ----------------
|
|
* (4) disable async.c's signal handler.
|
|
* ----------------
|
|
*/
|
|
DisableNotifyInterrupt();
|
|
|
|
/* ----------------
|
|
* (5) check for any other interesting events that happened
|
|
* while we slept.
|
|
* ----------------
|
|
*/
|
|
if (got_SIGHUP)
|
|
{
|
|
got_SIGHUP = false;
|
|
ProcessConfigFile(PGC_SIGHUP);
|
|
}
|
|
|
|
/* ----------------
|
|
* (6) process the command.
|
|
* ----------------
|
|
*/
|
|
switch (firstchar)
|
|
{
|
|
/* ----------------
|
|
* 'F' indicates a fastpath call.
|
|
* ----------------
|
|
*/
|
|
case 'F':
|
|
/* start an xact for this function invocation */
|
|
start_xact_command();
|
|
|
|
if (HandleFunctionRequest() == EOF)
|
|
{
|
|
/* lost frontend connection during F message input */
|
|
goto normalexit;
|
|
}
|
|
|
|
/* commit the function-invocation transaction */
|
|
finish_xact_command();
|
|
break;
|
|
|
|
/* ----------------
|
|
* 'Q' indicates a user query
|
|
* ----------------
|
|
*/
|
|
case 'Q':
|
|
if (strspn(parser_input->data, " \t\r\n") == parser_input->len)
|
|
{
|
|
/* ----------------
|
|
* if there is nothing in the input buffer, don't bother
|
|
* trying to parse and execute anything; just send
|
|
* back a quick NullCommand response.
|
|
* ----------------
|
|
*/
|
|
if (IsUnderPostmaster)
|
|
NullCommand(Remote);
|
|
}
|
|
else
|
|
{
|
|
/* ----------------
|
|
* otherwise, process the input string.
|
|
*
|
|
* Note: transaction command start/end is now done
|
|
* within pg_exec_query_string(), not here.
|
|
* ----------------
|
|
*/
|
|
if (Show_query_stats)
|
|
ResetUsage();
|
|
|
|
pg_exec_query_string(parser_input->data,
|
|
whereToSendOutput,
|
|
QueryContext);
|
|
|
|
if (Show_query_stats)
|
|
{
|
|
fprintf(StatFp, "QUERY STATISTICS\n");
|
|
ShowUsage();
|
|
}
|
|
}
|
|
break;
|
|
|
|
/* ----------------
|
|
* 'X' means that the frontend is closing down the socket.
|
|
* EOF means unexpected loss of frontend connection.
|
|
* Either way, perform normal shutdown.
|
|
* ----------------
|
|
*/
|
|
case 'X':
|
|
case EOF:
|
|
goto normalexit;
|
|
|
|
default:
|
|
elog(ERROR, "unknown frontend message was received");
|
|
}
|
|
|
|
#ifdef MEMORY_CONTEXT_CHECKING
|
|
/*
|
|
* Check all memory after each backend loop. This is a rather
|
|
* weird place to do it, perhaps.
|
|
*/
|
|
MemoryContextCheck(TopMemoryContext);
|
|
#endif
|
|
} /* end of input-reading loop */
|
|
|
|
normalexit:
|
|
ExitAfterAbort = true; /* ensure we will exit if elog during abort */
|
|
AbortOutOfAnyTransaction();
|
|
if (!IsUnderPostmaster)
|
|
ShutdownXLOG();
|
|
|
|
errorexit:
|
|
pq_close();
|
|
ProcReleaseLocks(); /* Just to be sure... */
|
|
proc_exit(0);
|
|
|
|
return 1; /* keep compiler quiet */
|
|
}
|
|
|
|
#ifndef HAVE_GETRUSAGE
|
|
#include "rusagestub.h"
|
|
#else
|
|
#include <sys/resource.h>
|
|
#endif /* HAVE_GETRUSAGE */
|
|
|
|
struct rusage Save_r;
|
|
struct timeval Save_t;
|
|
|
|
void
|
|
ResetUsage(void)
|
|
{
|
|
struct timezone tz;
|
|
|
|
getrusage(RUSAGE_SELF, &Save_r);
|
|
gettimeofday(&Save_t, &tz);
|
|
ResetBufferUsage();
|
|
/* ResetTupleCount(); */
|
|
}
|
|
|
|
void
|
|
ShowUsage(void)
|
|
{
|
|
struct timeval user,
|
|
sys;
|
|
struct timeval elapse_t;
|
|
struct timezone tz;
|
|
struct rusage r;
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Set output destination if not otherwise set
|
|
*/
|
|
if (StatFp == NULL)
|
|
StatFp = stderr;
|
|
|
|
/*
|
|
* 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);
|
|
/* BeOS has rusage but only has some fields, and not these... */
|
|
#if defined(HAVE_GETRUSAGE) && !defined(__BEOS__)
|
|
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); */
|
|
}
|
|
|
|
#ifdef NOT_USED
|
|
static int
|
|
assertEnable(int val)
|
|
{
|
|
assert_enabled = val;
|
|
return val;
|
|
}
|
|
|
|
#ifdef ASSERT_CHECKING_TEST
|
|
int
|
|
assertTest(int val)
|
|
{
|
|
Assert(val == 0);
|
|
|
|
if (assert_enabled)
|
|
{
|
|
/* val != 0 should be trapped by previous Assert */
|
|
elog(NOTICE, "Assert test successfull (val = %d)", val);
|
|
}
|
|
else
|
|
elog(NOTICE, "Assert checking is disabled (val = %d)", val);
|
|
|
|
return val;
|
|
}
|
|
|
|
#endif
|
|
#endif
|