blob: 738ed022b3bb16313ee6e65b576caef789ae8358
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 source tree. |
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 | */ |
20 | int FAST_FUNC get_linux_version_code(void) |
21 | { |
22 | struct utsname name; |
23 | char *s, *t; |
24 | int i, r; |
25 | |
26 | uname(&name); /* never fails */ |
27 | s = name.release; |
28 | r = 0; |
29 | for (i = 0; i < 3; i++) { |
30 | t = strtok(s, "."); |
31 | r = r * 256 + (t ? atoi(t) : 0); |
32 | s = NULL; |
33 | } |
34 | return r; |
35 | } |
36 |