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 timerel' for durations and 'struct timeabs' for timestamps
   9  * which are light wrappers around struct timespec.
  10  *
  11  * Author: Rusty Russell <rusty@rustcorp.com.au>
  12  * License: BSD-MIT
  13  *
  14  * Example:
  15  *      #include <ccan/time/time.h>
  16  *      #include <stdlib.h>
  17  *      #include <stdio.h>
  18  *      #include <err.h>
  19  *
  20  *      int main(int argc, char *argv[])
  21  *      {
  22  *              struct timeabs t;
  23  *
  24  *              if (argc != 2)
  25  *                      errx(1, "Usage: %s <diff in millisec>", argv[0]);
  26  *
  27  *              t = time_now();
  28  *              if (argv[1][0] == '-')
  29  *                      t = timeabs_sub(t, time_from_msec(atol(argv[1]+1)));
  30  *              else
  31  *                      t = timeabs_add(t, time_from_msec(atol(argv[1])));
  32  *
  33  *              printf("%lu.%09u\n",
  34  *                     (unsigned long)t.ts.tv_sec, (unsigned)t.ts.tv_nsec);
  35  *              return 0;
  36  *      }
  37  */
  38 int main(int argc, char *argv[])
  39 {
  40         /* Expect exactly one argument */
  41         if (argc != 2)
  42                 return 1;
  43
  44         if (strcmp(argv[1], "depends") == 0) {
  45                 return 0;
  46         }
  47
  48 #if HAVE_CLOCK_GETTIME_IN_LIBRT
  49         if (strcmp(argv[1], "libs") == 0) {
  50                 printf("rt\n");
  51                 return 0;
  52         }
  53 #endif
  54
  55         return 1;
  56 }