-/* Provide gettimeofday for systems that don't have it, or,
- work around the bug in some systems whereby 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 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007 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
#include <config.h>
-/* Disable the definitions of these functions (from config.h)
- so we can use the library versions here. */
-#undef gettimeofday
-#undef gmtime
-#undef localtime
-#undef tzset
+/* Specification. */
+#include <sys/time.h>
-#include <sys/types.h>
+#include <time.h>
-#if TIME_WITH_SYS_TIME
-# include <sys/time.h>
-# include <time.h>
-#else
-# if HAVE_SYS_TIME_H
-# include <sys/time.h>
-# else
-# include <time.h>
-# endif
+#if HAVE_SYS_TIMEB_H
+# include <sys/timeb.h>
#endif
-#include <stdlib.h>
+#if GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME
-#if HAVE_SYS_TIMEB_H
-#include <sys/timeb.h>
-#endif
+/* 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. */
-#if GETTIMEOFDAY_CLOBBERS_LOCALTIME
-static struct tm *localtime_buffer_addr;
-#endif
+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.
On the first call, record the address of the static buffer that
localtime uses for its result. */
-#if GETTIMEOFDAY_CLOBBERS_LOCALTIME
struct tm *
-rpl_localtime (const time_t *timep)
+rpl_localtime (time_t const *timep)
{
struct tm *tm = localtime (timep);
- if (! localtime_buffer_addr)
+ if (localtime_buffer_addr == &tm_zero_buffer)
localtime_buffer_addr = tm;
return tm;
}
-#endif
/* Same as above, since gmtime and localtime use the same buffer. */
-#if GETTIMEOFDAY_CLOBBERS_LOCALTIME
struct tm *
-rpl_gmtime (const time_t *timep)
+rpl_gmtime (time_t const *timep)
{
struct tm *tm = gmtime (timep);
- if (! localtime_buffer_addr)
+ if (localtime_buffer_addr == &tm_zero_buffer)
localtime_buffer_addr = tm;
return tm;
}
+
+#endif /* GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME */
+
+#if TZSET_CLOBBERS_LOCALTIME
+
+#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
rpl_gettimeofday (struct timeval *restrict tv, void *restrict tz)
{
+#undef gettimeofday
#if HAVE_GETTIMEOFDAY
# if GETTIMEOFDAY_CLOBBERS_LOCALTIME
+ /* 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
- /* Save and restore the contents of the buffer used for localtime's result
- around the call to gettimeofday. */
- struct tm save;
- int result;
-
- if (! localtime_buffer_addr)
- {
- time_t t = 0;
- localtime_buffer_addr = localtime (&t);
- }
+ int result = gettimeofday (tv, tz);
- 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;
- return 0;
-
# endif
-#endif
-}
-
-/* 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. */
-#if GETTIMEOFDAY_CLOBBERS_LOCALTIME
-void
-rpl_tzset (void)
-{
- struct tm save;
- if (! localtime_buffer_addr)
- {
- time_t t = 0;
- localtime_buffer_addr = localtime (&t);
- }
+ return 0;
- save = *localtime_buffer_addr;
- tzset ();
- *localtime_buffer_addr = save;
-}
#endif
+}