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 tarball for details. 8 */ 9 10#include <sys/utsname.h> /* for uname(2) */ 11 12#include "libbb.h" 13 14/* Returns current kernel version encoded as major*65536 + minor*256 + patch, 15 * so, for example, to check if the kernel is greater than 2.2.11: 16 * 17 * if (get_linux_version_code() > KERNEL_VERSION(2,2,11)) { <stuff> } 18 */ 19int get_linux_version_code(void) 20{ 21 struct utsname name; 22 char *s; 23 int i, r; 24 25 if (uname(&name) == -1) { 26 bb_perror_msg("cannot get system information"); 27 return 0; 28 } 29 30 s = name.release; 31 r = 0; 32 for (i = 0; i < 3; i++) { 33 r = r * 256 + atoi(strtok(s, ".")); 34 s = NULL; 35 } 36 return r; 37} 38