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Chet Ramey
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* gettimeofday.c - gettimeofday replacement using time() */
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/* Copyright (C) 2020, 2022 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#if !defined (HAVE_GETTIMEOFDAY)
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#include "posixtime.h"
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#if HAVE_STDINT_H
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#include <stdint.h>
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#endif
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/* A version of gettimeofday that just sets tv_sec from time(3) on Unix-like
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systems that don't have it, or a version for Win32 systems. */
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int
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gettimeofday (struct timeval *restrict tv, void *restrict tz)
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{
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#if !defined (_WIN32)
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tv->tv_sec = (time_t) time ((time_t *)0);
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tv->tv_usec = 0;
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#else
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/* EPOCH is the number of 100 nanosecond intervals from
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January 1, 1601 (UTC) to January 1, 1970.
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(the correct value has 9 trailing zeros) */
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static const uint64_t EPOCH = ((uint64_t) 116444736000000000ULL);
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SYSTEMTIME system_time;
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FILETIME file_time;
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uint64_t time;
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GetSystemTime(&system_time);
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SystemTimeToFileTime(&system_time, &file_time);
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time = ((uint64_t)file_time.dwLowDateTime);
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time += ((uint64_t)file_time.dwHighDateTime) << 32;
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tp->tv_sec = (long) ((time - EPOCH) / 10000000L);
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tp->tv_usec = (long) (system_time.wMilliseconds * 1000);
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#endif
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return 0;
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}
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#endif
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