1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10#include "libbb.h"
11/* After libbb.h, since it needs sys/types.h on some systems */
12#include <sys/utsname.h>  /* for uname(2) */
13
14
15/* Returns current kernel version encoded as major*65536 + minor*256 + patch,
16 * so, for example,  to check if the kernel is greater than 2.2.11:
17 *
18 *     if (get_linux_version_code() > KERNEL_VERSION(2,2,11)) { <stuff> }
19 */
20int FAST_FUNC get_linux_version_code(void)
21{
22	struct utsname name;
23	char *s;
24	int i, r;
25
26	if (uname(&name) == -1) {
27		bb_perror_msg("can't get system information");
28		return 0;
29	}
30
31	s = name.release;
32	r = 0;
33	for (i = 0; i < 3; i++) {
34		r = r * 256 + atoi(strtok(s, "."));
35		s = NULL;
36	}
37	return r;
38}
39