1/* Copyright (C) 1991-2022 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. */
25int
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
40strong_alias (___gettimeofday, __gettimeofday)
41weak_alias (___gettimeofday, gettimeofday)
42#endif
43

source code of glibc/time/gettimeofday.c