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Localtime function skeleton and file added.

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antirez 2018-07-04 12:56:12 +02:00
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src/localtime.c Normal file
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/*
* Copyright (c) 2018, Salvatore Sanfilippo <antirez at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Redis nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <time.h>
/* This is a safe version of localtime() which contains no locks and is
* fork() friendly. Even the _r version of localtime() cannot be used safely
* in Redis. Another thread may be calling localtime() while the main thread
* forks(). Later when the child process calls localtime() again, for instance
* in order to log something to the Redis log, it may deadlock: in the copy
* of the address space of the forked process the lock will never be released.
*
* This function takes the timezone 'tz' as argument, and the 'dst' flag is
* used to check if daylight saving time is currently in effect. The caller
* of this function should obtain such information calling tzset() ASAP in the
* main() function, and later accessing the globals 'timezone' and 'daylight'. */
void nolocks_localtime(struct tm *tmptr, time_t t, time_t tz, int dst) {
}