time/gettimeofday.c

   1 /* Copyright (C) 1991-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C 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    The GNU C 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 the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <string.h>
  19 #include <time.h>
  20 #include <sys/time.h>
  21
  22 /* Get the current time of day, putting it into *TV.
  23    If *TZ is not NULL, clear it.
  24    Returns 0 on success, -1 on errors.  */
  25 int
  26 ___gettimeofday (struct timeval *restrict tv, void *restrict tz)
  27 {
  28   if (__glibc_unlikely (tz != 0))
  29     memset (tz, 0, sizeof (struct timezone));
  30
  31   struct timespec ts;
  32   if (__clock_gettime (CLOCK_REALTIME, &ts))
  33     return -1;
  34
  35   TIMESPEC_TO_TIMEVAL (tv, &ts);
  36   return 0;
  37 }
  38 /* Define to override default symbol version.  */
  39 #ifndef SET_VERSION
  40 strong_alias (___gettimeofday, __gettimeofday)
  41 weak_alias (___gettimeofday, gettimeofday)
  42 #endif