busybox/libbb/kernel_version.c
Andreas Oberritter 556ac3633c get_linux_version_code: don't fail on Linux version strints like "3.0-foo"
Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2012-05-05 17:47:23 +02:00

36 lines
822 B
C

/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
/* After libbb.h, since it needs sys/types.h on some systems */
#include <sys/utsname.h> /* for uname(2) */
/* Returns current kernel version encoded as major*65536 + minor*256 + patch,
* so, for example, to check if the kernel is greater than 2.2.11:
*
* if (get_linux_version_code() > KERNEL_VERSION(2,2,11)) { <stuff> }
*/
int FAST_FUNC get_linux_version_code(void)
{
struct utsname name;
char *s, *t;
int i, r;
uname(&name); /* never fails */
s = name.release;
r = 0;
for (i = 0; i < 3; i++) {
t = strtok(s, ".");
r = r * 256 + (t ? atoi(t) : 0);
s = NULL;
}
return r;
}