lib/linux_version.c

   1 #include <stdio.h>
   2 #include <sys/utsname.h>
   3
   4 #include "c.h"
   5 #include "linux_version.h"
   6
   7 int get_linux_version (void)
   8 {
   9         static int kver = -1;
  10         struct utsname uts;
  11         int x = 0, y = 0, z = 0;
  12         int n;
  13
  14         if (kver != -1)
  15                 return kver;
  16         if (uname(&uts))
  17                 return kver = 0;
  18
  19         n = sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
  20         if (n < 1 || n > 3)
  21                 return kver = 0;
  22
  23         return kver = KERNEL_VERSION(x, y, z);
  24 }
  25
  26 #ifdef TEST_PROGRAM_LINUXVERSION
  27 # include <stdlib.h>
  28 int main(int argc, char *argv[])
  29 {
  30         int rc = EXIT_FAILURE;
  31
  32         if (argc == 1) {
  33                 printf("Linux version: %d\n", get_linux_version());
  34                 rc = EXIT_SUCCESS;
  35
  36         } else if (argc == 5) {
  37                 const char *oper = argv[1];
  38
  39                 int x = atoi(argv[2]),
  40                     y = atoi(argv[3]),
  41                     z = atoi(argv[4]);
  42                 int kver = get_linux_version();
  43                 int uver = KERNEL_VERSION(x, y, z);
  44
  45                 if (strcmp(oper, "==") == 0)
  46                         rc = kver == uver;
  47                 else if (strcmp(oper, "<=") == 0)
  48                         rc = kver <= uver;
  49                 else if (strcmp(oper, ">=") == 0)
  50                         rc = kver >= uver;
  51                 else
  52                         errx(EXIT_FAILURE, "unsupported operator");
  53
  54                 if (rc)
  55                         printf("match\n");
  56                 else
  57                         printf("not-match [%d %s %d, x.y.z: %d.%d.%d]\n",
  58                                         kver, oper, uver, x, y, z);
  59
  60                 rc = rc ? EXIT_SUCCESS : EXIT_FAILURE;
  61
  62         } else
  63                  fprintf(stderr, "Usage:\n"
  64                                  "   %s [<oper> <x> <y> <z>]\n"
  65                                  "supported operators:\n"
  66                                  "   ==, <=, >=\n",
  67                                  program_invocation_short_name);
  68
  69         return rc;
  70 }
  71 #endif