src/common/time.h

   1 /*
   2  * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  17  */
  18
  19 #ifndef LTTNG_TIME_H
  20 #define LTTNG_TIME_H
  21
  22 #include <time.h>
  23
  24 #define MSEC_PER_SEC    1000ULL
  25 #define NSEC_PER_SEC    1000000000ULL
  26 #define NSEC_PER_MSEC   1000000ULL
  27 #define NSEC_PER_USEC   1000ULL
  28
  29 /*
  30  * timespec_to_ms: Convert timespec to milliseconds.
  31  *
  32  * Returns 0 on success, else -1 on error. errno is set to EOVERFLOW if
  33  * input would overflow the output in milliseconds.
  34  */
  35 int timespec_to_ms(struct timespec ts, unsigned long *ms);
  36
  37 /*
  38  * timespec_abs_diff: Absolute difference between timespec.
  39  */
  40 struct timespec timespec_abs_diff(struct timespec ts_a, struct timespec ts_b);
  41
  42 #endif /* LTTNG_TIME_H */