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/*-------------------------------------------------------------------------
*
* controldata_utils.c
* Common code for control data file output.
*
*
* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/common/controldata_utils.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "catalog/pg_control.h"
#include "common/controldata_utils.h"
#include "port/pg_crc32c.h"
/*
* get_controlfile(char *DataDir, const char *progname)
*
* Get controlfile values. The caller is responsible
* for pfreeing the result.
*
* Returns NULL if the CRC did not match.
*/
ControlFileData *
get_controlfile(const char *DataDir, const char *progname)
{
ControlFileData *ControlFile;
int fd;
char ControlFilePath[MAXPGPATH];
pg_crc32c crc;
ControlFile = palloc(sizeof(ControlFileData));
snprintf(ControlFilePath, MAXPGPATH, "%s/global/pg_control", DataDir);
if ((fd = open(ControlFilePath, O_RDONLY | PG_BINARY, 0)) == -1)
#ifndef FRONTEND
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not open file \"%s\" for reading: %m",
ControlFilePath)));
#else
{
fprintf(stderr, _("%s: could not open file \"%s\" for reading: %s\n"),
progname, ControlFilePath, strerror(errno));
exit(EXIT_FAILURE);
}
#endif
if (read(fd, ControlFile, sizeof(ControlFileData)) != sizeof(ControlFileData))
#ifndef FRONTEND
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not read file \"%s\": %m", ControlFilePath)));
#else
{
fprintf(stderr, _("%s: could not read file \"%s\": %s\n"),
progname, ControlFilePath, strerror(errno));
exit(EXIT_FAILURE);
}
#endif
close(fd);
/* Check the CRC. */
INIT_CRC32C(crc);
COMP_CRC32C(crc,
(char *) ControlFile,
offsetof(ControlFileData, crc));
FIN_CRC32C(crc);
if (!EQ_CRC32C(crc, ControlFile->crc))
{
pfree(ControlFile);
return NULL;
}
/* Make sure the control file is valid byte order. */
if (ControlFile->pg_control_version % 65536 == 0 &&
ControlFile->pg_control_version / 65536 != 0)
#ifndef FRONTEND
elog(ERROR, _("byte ordering mismatch"));
#else
printf(_("WARNING: possible byte ordering mismatch\n"
"The byte ordering used to store the pg_control file might not match the one\n"
"used by this program. In that case the results below would be incorrect, and\n"
"the PostgreSQL installation would be incompatible with this data directory.\n"));
#endif
return ControlFile;
}
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