git.ozlabs.org Git - ccan/blob - ccan/time/_info

   1 #include <string.h>
   2 #include "config.h"
   3
   4 /**
   5  * time - routines for dealing with time
   6  *
   7  * This code provides convenient functions for working with time, in the
   8  * form of 'struct timespec'.
   9  *
  10  * Author: Rusty Russell <rusty@rustcorp.com.au>
  11  * License: BSD-MIT
  12  *
  13  * Example:
  14  *      #include <ccan/time/time.h>
  15  *      #include <stdlib.h>
  16  *      #include <stdio.h>
  17  *      #include <err.h>
  18  *
  19  *      int main(int argc, char *argv[])
  20  *      {
  21  *              struct timespec t;
  22  *
  23  *              if (argc != 2)
  24  *                      errx(1, "Usage: %s <diff in millisec>", argv[0]);
  25  *
  26  *              t = time_now();
  27  *              if (argv[1][0] == '-')
  28  *                      t = time_sub(t, time_from_msec(atol(argv[1]+1)));
  29  *              else
  30  *                      t = time_add(t, time_from_msec(atol(argv[1])));
  31  *
  32  *              printf("%lu.%09u\n",
  33  *                     (unsigned long)t.tv_sec, (unsigned)t.tv_nsec);
  34  *              return 0;
  35  *      }
  36  */
  37 int main(int argc, char *argv[])
  38 {
  39         /* Expect exactly one argument */
  40         if (argc != 2)
  41                 return 1;
  42
  43         if (strcmp(argv[1], "depends") == 0) {
  44                 return 0;
  45         }
  46
  47 #if HAVE_CLOCK_GETTIME_IN_LIBRT
  48         if (strcmp(argv[1], "libs") == 0) {
  49                 printf("rt\n");
  50                 return 0;
  51         }
  52 #endif
  53
  54         return 1;
  55 }