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/*
* libprocps - Library to read proc filesystem
*
* Copyright (C) 1995 Martin Schulze <joey@infodrom.north.de>
* Copyright (C) 1996 Charles Blake <cblake@bbn.com>
* Copyright (C) 2003 Albert Cahalan
* Copyright (C) 2015 Craig Small <csmall@dropbear.xyz>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <errno.h>
#include <stdio.h>
#include "misc.h"
#include "procps-private.h"
#ifdef __CYGWIN__
#define PROCFS_OSRELEASE "/proc/version"
#define PROCFS_OSPATTERN "%*s version %u.%u.%u"
#else
#define PROCFS_OSRELEASE "/proc/sys/kernel/osrelease"
#define PROCFS_OSPATTERN "%u.%u.%u"
#endif
/*
* procps_linux_version
*
* Return the current running Linux version release as shown in
* the procps filesystem.
*
* There are three ways you can get OS release:
* 1) /proc/sys/kernel/osrelease - returns correct version of procfs
* 2) /proc/version - returns version of kernel e.g. BSD this is wrong
* 3) uname and uts.release - same as /proc/version field #3
*
* Returns: version as an integer
* Negative value means an error
*/
PROCPS_EXPORT int procps_linux_version(void)
{
FILE *fp;
char buf[256];
unsigned int x = 0, y = 0, z = 0;
int version_string_depth;
if ((fp = fopen(PROCFS_OSRELEASE, "r")) == NULL)
return -errno;
if (fgets(buf, 256, fp) == NULL) {
fclose(fp);
return -EIO;
}
fclose(fp);
version_string_depth = sscanf(buf, PROCFS_OSPATTERN, &x, &y, &z);
if ((version_string_depth < 2) || /* Non-standard for all known kernels */
((version_string_depth < 3) && (x < 3))) /* Non-standard for 2.x.x kernels */
return -ERANGE;
return LINUX_VERSION(x,y,z);
}
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