124 lines
3.0 KiB
C
124 lines
3.0 KiB
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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