lib/linux_version.c

   1 /*
   2  * No copyright is claimed.  This code is in the public domain; do with
   3  * it what you wish.
   4  */
   5 #include <stdio.h>
   6 #include <sys/utsname.h>
   7
   8 #include "c.h"
   9 #include "linux_version.h"
  10
  11 int get_linux_version (void)
  12 {
  13         static int kver = -1;
  14         struct utsname uts;
  15         int x = 0, y = 0, z = 0;
  16         int n;
  17
  18         if (kver != -1)
  19                 return kver;
  20         if (uname(&uts))
  21                 return kver = 0;
  22
  23         n = sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
  24         if (n < 1 || n > 3)
  25                 return kver = 0;
  26
  27         return kver = KERNEL_VERSION(x, y, z);
  28 }
  29
  30 #ifdef TEST_PROGRAM_LINUXVERSION
  31 # include <stdlib.h>
  32 int main(int argc, char *argv[])
  33 {
  34         int rc = EXIT_FAILURE;
  35
  36         if (argc == 1) {
  37                 printf("Linux version: %d\n", get_linux_version());
  38                 rc = EXIT_SUCCESS;
  39
  40         } else if (argc == 5) {
  41                 const char *oper = argv[1];
  42
  43                 int x = atoi(argv[2]),
  44                     y = atoi(argv[3]),
  45                     z = atoi(argv[4]);
  46                 int kver = get_linux_version();
  47                 int uver = KERNEL_VERSION(x, y, z);
  48
  49                 if (strcmp(oper, "==") == 0)
  50                         rc = kver == uver;
  51                 else if (strcmp(oper, "<=") == 0)
  52                         rc = kver <= uver;
  53                 else if (strcmp(oper, ">=") == 0)
  54                         rc = kver >= uver;
  55                 else
  56                         errx(EXIT_FAILURE, "unsupported operator");
  57
  58                 if (rc)
  59                         printf("match\n");
  60                 else
  61                         printf("not-match [%d %s %d, x.y.z: %d.%d.%d]\n",
  62                                         kver, oper, uver, x, y, z);
  63
  64                 rc = rc ? EXIT_SUCCESS : EXIT_FAILURE;
  65
  66         } else
  67                  fprintf(stderr, "Usage:\n"
  68                                  "   %s [<oper> <x> <y> <z>]\n"
  69                                  "supported operators:\n"
  70                                  "   ==, <=, >=\n",
  71                                  program_invocation_short_name);
  72
  73         return rc;
  74 }
  75 #endif