LXR busybox/libbb/kernel

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