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