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124 lines
3.3 KiB
C
124 lines
3.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* controldata_utils.c
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* Common code for control data file output.
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*
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*
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* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
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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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* src/common/controldata_utils.c
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef FRONTEND
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#include "postgres.h"
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#else
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#include "postgres_fe.h"
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#endif
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#include <unistd.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "catalog/pg_control.h"
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#include "common/controldata_utils.h"
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#include "port/pg_crc32c.h"
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/*
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* get_controlfile(char *DataDir, const char *progname)
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*
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* Get controlfile values. The caller is responsible
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* for pfreeing the result.
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*/
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ControlFileData *
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get_controlfile(char *DataDir, const char *progname)
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{
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ControlFileData *ControlFile;
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int fd;
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char ControlFilePath[MAXPGPATH];
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pg_crc32c crc;
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int r;
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ControlFile = palloc(sizeof(ControlFileData));
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snprintf(ControlFilePath, MAXPGPATH, "%s/global/pg_control", DataDir);
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if ((fd = open(ControlFilePath, O_RDONLY | PG_BINARY, 0)) == -1)
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#ifndef FRONTEND
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not open file \"%s\" for reading: %m",
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ControlFilePath)));
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#else
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{
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fprintf(stderr, _("%s: could not open file \"%s\" for reading: %s\n"),
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progname, ControlFilePath, strerror(errno));
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exit(EXIT_FAILURE);
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}
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#endif
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r = read(fd, ControlFile, sizeof(ControlFileData));
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if (r != sizeof(ControlFileData))
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{
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if (r < 0)
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#ifndef FRONTEND
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not read file \"%s\": %m", ControlFilePath)));
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#else
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{
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fprintf(stderr, _("%s: could not read file \"%s\": %s\n"),
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progname, ControlFilePath, strerror(errno));
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exit(EXIT_FAILURE);
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}
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#endif
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else
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#ifndef FRONTEND
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ereport(ERROR,
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(errmsg("could not read file \"%s\": read %d of %d",
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ControlFilePath, r, (int) sizeof(ControlFileData))));
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#else
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{
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fprintf(stderr, _("%s: could not read file \"%s\": read %d of %d\n"),
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progname, ControlFilePath, r, (int) sizeof(ControlFileData));
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exit(EXIT_FAILURE);
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}
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#endif
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}
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close(fd);
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/* Check the CRC. */
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INIT_CRC32C(crc);
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COMP_CRC32C(crc,
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(char *) ControlFile,
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offsetof(ControlFileData, crc));
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FIN_CRC32C(crc);
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if (!EQ_CRC32C(crc, ControlFile->crc))
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#ifndef FRONTEND
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elog(ERROR, _("calculated CRC checksum does not match value stored in file"));
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#else
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printf(_("WARNING: Calculated CRC checksum does not match value stored in file.\n"
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"Either the file is corrupt, or it has a different layout than this program\n"
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"is expecting. The results below are untrustworthy.\n\n"));
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#endif
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/* Make sure the control file is valid byte order. */
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if (ControlFile->pg_control_version % 65536 == 0 &&
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ControlFile->pg_control_version / 65536 != 0)
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#ifndef FRONTEND
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elog(ERROR, _("byte ordering mismatch"));
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#else
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printf(_("WARNING: possible byte ordering mismatch\n"
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"The byte ordering used to store the pg_control file might not match the one\n"
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"used by this program. In that case the results below would be incorrect, and\n"
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"the PostgreSQL installation would be incompatible with this data directory.\n"));
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#endif
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return ControlFile;
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}
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