Merge branch 'Teaman-ND' into Teaman-RT
[tomato.git] / release / src / router / busybox / libbb / kernel_version.c
bloba168a1e4ef2b28dc18b16b70cad36b2f9427f270
1 /* vi: set sw=4 ts=4: */
2 /*
3 * Utility routines.
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 */
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) */
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:
18 * if (get_linux_version_code() > KERNEL_VERSION(2,2,11)) { <stuff> }
20 int FAST_FUNC get_linux_version_code(void)
22 struct utsname name;
23 char *s;
24 int i, r;
26 if (uname(&name) == -1) {
27 bb_perror_msg("can't get system information");
28 return 0;
31 s = name.release;
32 r = 0;
33 for (i = 0; i < 3; i++) {
34 r = r * 256 + atoi(strtok(s, "."));
35 s = NULL;
37 return r;