-/* Provide gettimeofday
- 1. for systems that don't have it,
- 2. for some systems where gettimeofday clobbers the static buffer that
- localtime uses for it's return value. The gettimeofday function from
- Mac OS X 10.0.4, i.e. Darwin 1.3.7 has this problem.
- The tzset replacement is necessary for at least Solaris 2.5, 2.5.1, and
- 2.6.
+/* Provide gettimeofday for systems that don't have it or for which it's broken.
- Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
+ Copyright (C) 2001-2003, 2005-2007, 2009-2014 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program; if not, see <http://www.gnu.org/licenses/>. */
/* written by Jim Meyering */
#include <config.h>
/* Specification. */
-#include "gettimeofday.h"
+#include <sys/time.h>
-#include <sys/types.h>
-#include <stdlib.h>
+#include <time.h>
#if HAVE_SYS_TIMEB_H
# include <sys/timeb.h>
#endif
-#if GETTIMEOFDAY_CLOBBERS_LOCALTIME
+#if GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME
-static struct tm *localtime_buffer_addr;
+/* Work around the bug in some systems whereby gettimeofday clobbers
+ the static buffer that localtime uses for its return value. The
+ gettimeofday function from Mac OS X 10.0.4 (i.e., Darwin 1.3.7) has
+ this problem. The tzset replacement is necessary for at least
+ Solaris 2.5, 2.5.1, and 2.6. */
+
+static struct tm tm_zero_buffer;
+static struct tm *localtime_buffer_addr = &tm_zero_buffer;
+
+# undef localtime
+extern struct tm *localtime (time_t const *);
+
+# undef gmtime
+extern struct tm *gmtime (time_t const *);
/* This is a wrapper for localtime. It is used only on systems for which
gettimeofday clobbers the static buffer used for localtime's result.
localtime uses for its result. */
struct tm *
-localtime (const time_t *timep)
-#undef localtime
+rpl_localtime (time_t const *timep)
{
- extern struct tm *localtime (const time_t *);
struct tm *tm = localtime (timep);
- if (! localtime_buffer_addr)
+ if (localtime_buffer_addr == &tm_zero_buffer)
localtime_buffer_addr = tm;
return tm;
/* Same as above, since gmtime and localtime use the same buffer. */
struct tm *
-gmtime (const time_t *timep)
-#undef gmtime
+rpl_gmtime (time_t const *timep)
{
- extern struct tm *gmtime (const time_t *);
struct tm *tm = gmtime (timep);
- if (! localtime_buffer_addr)
+ if (localtime_buffer_addr == &tm_zero_buffer)
localtime_buffer_addr = tm;
return tm;
}
-/* This is a wrapper for tzset. It is used only on systems for which
- tzset may clobber the static buffer used for localtime's result.
- Save and restore the contents of the buffer used for localtime's
- result around the call to tzset. */
-void
-tzset (void)
-#undef tzset
-{
- extern struct tm *localtime (const time_t *);
- extern void tzset (void);
- struct tm save;
+#endif /* GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME */
- if (! localtime_buffer_addr)
- {
- time_t t = 0;
- localtime_buffer_addr = localtime (&t);
- }
+#if TZSET_CLOBBERS_LOCALTIME
- save = *localtime_buffer_addr;
+# undef tzset
+extern void tzset (void);
+
+/* This is a wrapper for tzset, for systems on which tzset may clobber
+ the static buffer used for localtime's result. */
+void
+rpl_tzset (void)
+{
+ /* Save and restore the contents of the buffer used for localtime's
+ result around the call to tzset. */
+ struct tm save = *localtime_buffer_addr;
tzset ();
*localtime_buffer_addr = save;
}
-
#endif
-/* This is a wrapper for gettimeofday.
- It is used only on systems that lack this function, or for whose
- implementation of this function causes problems. */
+/* This is a wrapper for gettimeofday. It is used only on systems
+ that lack this function, or whose implementation of this function
+ causes problems. */
int
gettimeofday (struct timeval *restrict tv, void *restrict tz)
-#undef gettimeofday
{
+#undef gettimeofday
#if HAVE_GETTIMEOFDAY
# if GETTIMEOFDAY_CLOBBERS_LOCALTIME
- extern struct tm *localtime (const time_t *);
- extern int gettimeofday (/* unspecified arguments */);
-
- /* Save and restore the contents of the buffer used for localtime's result
- around the call to gettimeofday. */
- struct tm save;
- int result;
+ /* Save and restore the contents of the buffer used for localtime's
+ result around the call to gettimeofday. */
+ struct tm save = *localtime_buffer_addr;
+# endif
- if (! localtime_buffer_addr)
+# if defined timeval /* 'struct timeval' overridden by gnulib? */
+# undef timeval
+ struct timeval otv;
+ int result = gettimeofday (&otv, (struct timezone *) tz);
+ if (result == 0)
{
- time_t t = 0;
- localtime_buffer_addr = localtime (&t);
+ tv->tv_sec = otv.tv_sec;
+ tv->tv_usec = otv.tv_usec;
}
+# else
+ int result = gettimeofday (tv, (struct timezone *) tz);
+# endif
- save = *localtime_buffer_addr;
- result = gettimeofday (tv, tz);
+# if GETTIMEOFDAY_CLOBBERS_LOCALTIME
*localtime_buffer_addr = save;
+# endif
return result;
-# endif
#else
+
# if HAVE__FTIME
struct _timeb timebuf;
-
_ftime (&timebuf);
tv->tv_sec = timebuf.time;
tv->tv_usec = timebuf.millitm * 1000;
- return 0;
-
# else
- time_t t = time (NULL);
-
- if (t == (time_t) -1)
- return -1;
- tv->tv_sec = t;
+# if !defined OK_TO_USE_1S_CLOCK
+# error "Only 1-second nominal clock resolution found. Is that intended?" \
+ "If so, compile with the -DOK_TO_USE_1S_CLOCK option."
+# endif
+ tv->tv_sec = time (NULL);
tv->tv_usec = 0;
+# endif
+
return 0;
-# endif
#endif
}
projects / gnulib.git / blobdiff