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156 lines
4.0 KiB
C
156 lines
4.0 KiB
C
/* Provide gettimeofday for systems that don't have it or for which it's broken.
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Copyright (C) 2001-2003, 2005-2007, 2009-2017 Free Software
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Foundation, Inc.
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This program 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, or (at your option)
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any later version.
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This program 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 this program; if not, see <http://www.gnu.org/licenses/>. */
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/* written by Jim Meyering */
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#include <config.h>
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/* Specification. */
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#include <sys/time.h>
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#include <time.h>
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#if HAVE_SYS_TIMEB_H
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# include <sys/timeb.h>
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#endif
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#if GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME
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/* Work around the bug in some systems whereby gettimeofday clobbers
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the static buffer that localtime uses for its return value. The
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gettimeofday function from Mac OS X 10.0.4 (i.e., Darwin 1.3.7) has
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this problem. The tzset replacement is necessary for at least
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Solaris 2.5, 2.5.1, and 2.6. */
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static struct tm tm_zero_buffer;
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static struct tm *localtime_buffer_addr = &tm_zero_buffer;
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# undef localtime
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extern struct tm *localtime (time_t const *);
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# undef gmtime
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extern struct tm *gmtime (time_t const *);
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/* This is a wrapper for localtime. It is used only on systems for which
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gettimeofday clobbers the static buffer used for localtime's result.
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On the first call, record the address of the static buffer that
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localtime uses for its result. */
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struct tm *
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rpl_localtime (time_t const *timep)
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{
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struct tm *tm = localtime (timep);
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if (localtime_buffer_addr == &tm_zero_buffer)
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localtime_buffer_addr = tm;
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return tm;
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}
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/* Same as above, since gmtime and localtime use the same buffer. */
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struct tm *
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rpl_gmtime (time_t const *timep)
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{
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struct tm *tm = gmtime (timep);
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if (localtime_buffer_addr == &tm_zero_buffer)
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localtime_buffer_addr = tm;
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return tm;
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}
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#endif /* GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME */
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#if TZSET_CLOBBERS_LOCALTIME
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# undef tzset
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extern void tzset (void);
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/* This is a wrapper for tzset, for systems on which tzset may clobber
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the static buffer used for localtime's result. */
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void
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rpl_tzset (void)
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{
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/* Save and restore the contents of the buffer used for localtime's
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result around the call to tzset. */
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struct tm save = *localtime_buffer_addr;
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tzset ();
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*localtime_buffer_addr = save;
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}
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#endif
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/* This is a wrapper for gettimeofday. It is used only on systems
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that lack this function, or whose implementation of this function
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causes problems. */
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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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#undef gettimeofday
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#if HAVE_GETTIMEOFDAY
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# if GETTIMEOFDAY_CLOBBERS_LOCALTIME
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/* Save and restore the contents of the buffer used for localtime's
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result around the call to gettimeofday. */
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struct tm save = *localtime_buffer_addr;
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# endif
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# if defined timeval /* 'struct timeval' overridden by gnulib? */
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# undef timeval
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struct timeval otv;
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int result = gettimeofday (&otv, (struct timezone *) tz);
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if (result == 0)
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{
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tv->tv_sec = otv.tv_sec;
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tv->tv_usec = otv.tv_usec;
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}
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# else
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int result = gettimeofday (tv, (struct timezone *) tz);
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# endif
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# if GETTIMEOFDAY_CLOBBERS_LOCALTIME
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*localtime_buffer_addr = save;
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# endif
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return result;
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#else
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# if HAVE__FTIME
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struct _timeb timebuf;
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_ftime (&timebuf);
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tv->tv_sec = timebuf.time;
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tv->tv_usec = timebuf.millitm * 1000;
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# else
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# if !defined OK_TO_USE_1S_CLOCK
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# error "Only 1-second nominal clock resolution found. Is that intended?" \
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"If so, compile with the -DOK_TO_USE_1S_CLOCK option."
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# endif
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tv->tv_sec = time (NULL);
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tv->tv_usec = 0;
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# endif
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return 0;
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#endif
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}
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