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bmomjianbmomjian
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I had a need to read such things as the backend locale and the catalog
version number from the current database, and couldn't find any existing program to do that. linda:~$ pg_controldata Log file id: 0 Log file segment: 5 Last modified: Wed Feb 7 19:35:47 2001 Database block size: 8192 Blocks per segment of large relation: 131072 Catalog version number: 200101061 LC_COLLATE: en_GB LC_CTYPE: en_GB Log archive directory: Oliver Elphick Oliver.Elphick@lfix.co.uk
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‎contrib/README

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maps numeric files to table names
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by B Palmer <bpalmer@crimelabs.net>
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pg_controldata -
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Dump internal database site structures
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by Oliver Elphick <olly@lfix.co.uk>
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pg_dumplo -
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Dump large objects
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by Karel Zak <zakkr@zf.jcu.cz>

‎contrib/pg_controldata/Makefile

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#
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# $Header: /cvsroot/pgsql/contrib/pg_controldata/Attic/Makefile,v 1.1 2001/02/23 20:38:35 momjian Exp $
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#
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subdir = contrib/pg_controldata
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top_builddir = ../..
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include $(top_builddir)/src/Makefile.global
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override CPPFLAGS := -I$(libpq_srcdir) $(CPPFLAGS)
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OBJS = pg_controldata.o
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all: pg_controldata
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pg_controldata: $(OBJS) $(libpq_builddir)/libpq.a
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$(CC) $(CFLAGS) $(OBJS) $(libpq) $(LDFLAGS) $(LIBS) -o $@
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install: all installdirs
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$(INSTALL_PROGRAM) pg_controldata$(X) $(bindir)
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$(INSTALL_DATA) README.pg_controldata $(docdir)/contrib
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installdirs:
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$(mkinstalldirs) $(bindir) $(docdir)/contrib
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uninstall:
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rm -f $(bindir)/pg_controldata$(X) $(docdir)/contrib/README.pg_controldata
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clean distclean maintainer-clean:
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rm -f pg_controldata$(X) $(OBJS)
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depend dep:
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$(CC) -MM -MG $(CFLAGS) *.c > depend
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ifeq (depend,$(wildcard depend))
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include depend
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endif

‎contrib/pg_controldata/README.pg_controldata

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I had a need to read such things as the backend locale and the catalog
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version number from the current database, and couldn't find any existing
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program to do that.
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The attached utility produces this output:
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linda:~$ pg_controldata
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Log file id: 0
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Log file segment: 5
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Last modified: Wed Feb 7 19:35:47 2001
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Database block size: 8192
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Blocks per segment of large relation: 131072
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Catalog version number: 200101061
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LC_COLLATE: en_GB
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LC_CTYPE: en_GB
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Log archive directory:
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--
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Oliver Elphick <olly@lfix.co.uk>

‎contrib/pg_controldata/pg_controldata

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‎contrib/pg_controldata/pg_controldata.c

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/* pg_controldata
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*
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* reads the data from $PGDATA/global/pg_control
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*
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* copyright (c) Oliver Elphick <olly@lfix.co.uk>, 2001;
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* licence: BSD
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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typedef unsigned int uint32;
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#include "config.h"
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#include "access/xlogdefs.h"
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/*
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* #include "access/xlog.h"
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* #include "c.h"
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*/
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/* The following definitions are extracted from access/xlog.h and its
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* recursive includes. There is too much initialisation needed if
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* they are included direct. Perhaps someone more knowledgeable can
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* fix that.
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*/
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typedef struct crc64
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{
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uint32 crc1;
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uint32 crc2;
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} crc64;
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#define LOCALE_NAME_BUFLEN 128
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typedef enum DBState
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{
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DB_STARTUP = 0,
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DB_SHUTDOWNED,
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DB_SHUTDOWNING,
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DB_IN_RECOVERY,
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DB_IN_PRODUCTION
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} DBState;
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typedef struct ControlFileData
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{
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crc64 crc;
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uint32 logId; /* current log file id */
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uint32 logSeg; /* current log file segment (1-based) */
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struct
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XLogRecPtr checkPoint; /* last check point record ptr */
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time_t time; /* time stamp of last modification */
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DBState state; /* see enum above */
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/*
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* this data is used to make sure that configuration of this DB is
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* compatible with the backend executable
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*/
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uint32 blcksz; /* block size for this DB */
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uint32 relseg_size; /* blocks per segment of large relation */
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uint32 catalog_version_no; /* internal version number */
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/* active locales --- "C" if compiled without USE_LOCALE: */
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char lc_collate[LOCALE_NAME_BUFLEN];
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char lc_ctype[LOCALE_NAME_BUFLEN];
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/*
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* important directory locations
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*/
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char archdir[MAXPGPATH]; /* where to move offline log files */
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} ControlFileData;
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int main() {
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ControlFileData ControlFile;
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int fd;
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char ControlFilePath[MAXPGPATH];
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char *DataDir;
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char tmdt[32];
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DataDir = getenv("PGDATA");
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if ( DataDir == NULL ) {
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fprintf(stderr,"PGDATA is not defined\n");
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exit(1);
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}
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snprintf(ControlFilePath, MAXPGPATH, "%s/global/pg_control", DataDir);
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if ((fd = open(ControlFilePath, O_RDONLY)) == -1) {
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perror("Failed to open $PGDATA/global/pg_control for reading");
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exit(2);
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}
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read(fd, &ControlFile, sizeof(ControlFileData));
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strftime(tmdt, 32, "%c", localtime(&(ControlFile.time)));
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printf("Log file id: %u\n"
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"Log file segment: %u\n"
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"Last modified: %s\n"
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"Database block size: %u\n"
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"Blocks per segment of large relation: %u\n"
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"Catalog version number: %u\n"
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"LC_COLLATE: %s\n"
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"LC_CTYPE: %s\n"
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"Log archive directory: %s\n",
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ControlFile.logId,
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ControlFile.logSeg,
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tmdt,
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ControlFile.blcksz,
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ControlFile.relseg_size,
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ControlFile.catalog_version_no,
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ControlFile.lc_collate,
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ControlFile.lc_ctype,
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ControlFile.archdir);
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return (0);
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}
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‎contrib/pg_controldata/pg_controldata.o

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