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#include "libbb.h"
  10/* After libbb.h, since it needs sys/types.h on some systems */
  11#include <sys/utsname.h>  /* for uname(2) */
  12
  13/* Returns current kernel version encoded as major*65536 + minor*256 + patch,
  14 * so, for example,  to check if the kernel is greater than 2.2.11:
  15 *
  16 *     if (get_linux_version_code() > KERNEL_VERSION(2,2,11)) { <stuff> }
  17 */
  18int FAST_FUNC get_linux_version_code(void)
  19{
  20        struct utsname name;
  21        char *t;
  22        int r;
  23
  24        uname(&name); /* never fails */
  25        t = name.release - 1;
  26        r = 1;
  27        do {
  28                r <<= 8;
  29                if (t) {
  30                        r += atoi(++t);
  31                        t = strchr(t, '.');
  32                }
  33        } while (r < 0x1000000);
  34        return r - 0x1000000;
  35}
  36