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