version.c File Reference

#include "postgres_fe.h"
#include <sys/stat.h>
#include "common/logging.h"
#include "fe_utils/version.h"

Include dependency graph for version.c:

Go to the source code of this file.

Macros
#define	PG_VERSION_MAX_SIZE   64

Functions
uint32	get_pg_version (const char *datadir, char **version_str)

Macro Definition Documentation

PG_VERSION_MAX_SIZE

#define PG_VERSION_MAX_SIZE   64

Definition at line 27 of file version.c.

Function Documentation

get_pg_version()

uint32 get_pg_version	(	const char *	datadir,
		char **	version_str
	)

Definition at line 44 of file version.c.

{
    FILE       *version_fd;
    char        ver_filename[MAXPGPATH];
    char        buf[PG_VERSION_MAX_SIZE];
    int         v1 = 0,
                v2 = 0;
    struct stat st;
 
    snprintf(ver_filename, sizeof(ver_filename), "%s/PG_VERSION",
             datadir);
 
    if ((version_fd = fopen(ver_filename, "r")) == NULL)
        pg_fatal("could not open version file \"%s\": %m", ver_filename);
 
    if (fstat(fileno(version_fd), &st) != 0)
        pg_fatal("could not stat file \"%s\": %m", ver_filename);
    if (st.st_size > PG_VERSION_MAX_SIZE)
        pg_fatal("file \"%s\" is too large", ver_filename);
 
    if (fscanf(version_fd, "%63s", buf) == 0 ||
        sscanf(buf, "%d.%d", &v1, &v2) < 1)
        pg_fatal("could not parse version file \"%s\"", ver_filename);
 
    fclose(version_fd);
 
    if (version_str)
    {
        *version_str = pg_malloc(PG_VERSION_MAX_SIZE);
        memcpy(*version_str, buf, st.st_size);
    }
 
    if (v1 < 10)
    {
        /* pre-v10 style, e.g. 9.6.1 */
        return v1 * 10000 + v2 * 100;
    }
    else
    {
        /* post-v10 style, e.g. 10.1 */
        return v1 * 10000;
    }
}

References buf, datadir, fb(), fstat, MAXPGPATH, pg_fatal, pg_malloc(), PG_VERSION_MAX_SIZE, snprintf, and stat::st_size.

Referenced by check_data_dir(), check_data_directory(), CheckDataVersion(), and main().