tv.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <sys/time.h>
   3 #include <time.h>
   4 #include <inttypes.h>
   5 #include <assert.h>
   6 #include <string.h>
   7
   8 #include "gcc-compat.h"
   9 #include "err.h"
  10 #include "str.h"
  11 #include "log.h"
  12 #include "time.h"
  13
  14 /**
  15  * Compute the difference of two time values.
  16  *
  17  * \param b Minuend.
  18  * \param a Subtrahend.
  19  * \param diff Result pointer.
  20  *
  21  * If \a diff is not \p NULL, it contains the absolute value |\a b - \a a| on
  22  * return.
  23  *
  24  * \return If \a b < \a a, this function returns -1, otherwise it returns 1.
  25  */
  26 int tv_diff(const struct timeval *b, const struct timeval *a, struct timeval *diff)
  27 {
  28         int ret = 1;
  29
  30         if ((b->tv_sec < a->tv_sec) ||
  31                 ((b->tv_sec == a->tv_sec) && (b->tv_usec < a->tv_usec))) {
  32                 const struct timeval *tmp = a;
  33                 a = b;
  34                 b = tmp;
  35                 ret = -1;
  36         }
  37         if (!diff)
  38                 return ret;
  39         diff->tv_sec = b->tv_sec - a->tv_sec;
  40         if (b->tv_usec < a->tv_usec) {
  41                 diff->tv_sec--;
  42                 diff->tv_usec = 1000 * 1000 - a->tv_usec + b->tv_usec;
  43         } else
  44                 diff->tv_usec = b->tv_usec - a->tv_usec;
  45         return ret;
  46 }
  47
  48 int64_t get_current_time(void)
  49 {
  50         time_t now;
  51         time(&now);
  52         return (int64_t)now;
  53 }