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      1 /* -*- buffer-read-only: t -*- vi: set ro: */
      2 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */
      3 /* Provide gettimeofday for systems that don't have it or for which it's broken.
      4 
      5    Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007 Free Software
      6    Foundation, Inc.
      7 
      8    This program is free software; you can redistribute it and/or modify
      9    it under the terms of the GNU General Public License as published by
     10    the Free Software Foundation; either version 3, or (at your option)
     11    any later version.
     12 
     13    This program is distributed in the hope that it will be useful,
     14    but WITHOUT ANY WARRANTY; without even the implied warranty of
     15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     16    GNU General Public License for more details.
     17 
     18    You should have received a copy of the GNU General Public License
     19    along with this program; if not, write to the Free Software Foundation,
     20    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
     21 
     22 /* written by Jim Meyering */
     23 
     24 #include <config.h>
     25 
     26 /* Specification.  */
     27 #include <sys/time.h>
     28 
     29 #include <time.h>
     30 
     31 #if HAVE_SYS_TIMEB_H
     32 # include <sys/timeb.h>
     33 #endif
     34 
     35 #if GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME
     36 
     37 /* Work around the bug in some systems whereby gettimeofday clobbers
     38    the static buffer that localtime uses for its return value.  The
     39    gettimeofday function from Mac OS X 10.0.4 (i.e., Darwin 1.3.7) has
     40    this problem.  The tzset replacement is necessary for at least
     41    Solaris 2.5, 2.5.1, and 2.6.  */
     42 
     43 static struct tm tm_zero_buffer;
     44 static struct tm *localtime_buffer_addr = &tm_zero_buffer;
     45 
     46 #undef localtime
     47 extern struct tm *localtime (time_t const *);
     48 
     49 #undef gmtime
     50 extern struct tm *gmtime (time_t const *);
     51 
     52 /* This is a wrapper for localtime.  It is used only on systems for which
     53    gettimeofday clobbers the static buffer used for localtime's result.
     54 
     55    On the first call, record the address of the static buffer that
     56    localtime uses for its result.  */
     57 
     58 struct tm *
     59 rpl_localtime (time_t const *timep)
     60 {
     61   struct tm *tm = localtime (timep);
     62 
     63   if (localtime_buffer_addr == &tm_zero_buffer)
     64     localtime_buffer_addr = tm;
     65 
     66   return tm;
     67 }
     68 
     69 /* Same as above, since gmtime and localtime use the same buffer.  */
     70 struct tm *
     71 rpl_gmtime (time_t const *timep)
     72 {
     73   struct tm *tm = gmtime (timep);
     74 
     75   if (localtime_buffer_addr == &tm_zero_buffer)
     76     localtime_buffer_addr = tm;
     77 
     78   return tm;
     79 }
     80 
     81 #endif /* GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME */
     82 
     83 #if TZSET_CLOBBERS_LOCALTIME
     84 
     85 #undef tzset
     86 extern void tzset (void);
     87 
     88 /* This is a wrapper for tzset, for systems on which tzset may clobber
     89    the static buffer used for localtime's result.  */
     90 void
     91 rpl_tzset (void)
     92 {
     93   /* Save and restore the contents of the buffer used for localtime's
     94      result around the call to tzset.  */
     95   struct tm save = *localtime_buffer_addr;
     96   tzset ();
     97   *localtime_buffer_addr = save;
     98 }
     99 #endif
    100 
    101 /* This is a wrapper for gettimeofday.  It is used only on systems
    102    that lack this function, or whose implementation of this function
    103    causes problems.  */
    104 
    105 int
    106 rpl_gettimeofday (struct timeval *restrict tv, void *restrict tz)
    107 {
    108 #undef gettimeofday
    109 #if HAVE_GETTIMEOFDAY
    110 # if GETTIMEOFDAY_CLOBBERS_LOCALTIME
    111   /* Save and restore the contents of the buffer used for localtime's
    112      result around the call to gettimeofday.  */
    113   struct tm save = *localtime_buffer_addr;
    114 # endif
    115 
    116   int result = gettimeofday (tv, tz);
    117 
    118 # if GETTIMEOFDAY_CLOBBERS_LOCALTIME
    119   *localtime_buffer_addr = save;
    120 # endif
    121 
    122   return result;
    123 
    124 #else
    125 
    126 # if HAVE__FTIME
    127 
    128   struct _timeb timebuf;
    129   _ftime (&timebuf);
    130   tv->tv_sec = timebuf.time;
    131   tv->tv_usec = timebuf.millitm * 1000;
    132 
    133 # else
    134 
    135 #  if !defined OK_TO_USE_1S_CLOCK
    136 #   error "Only 1-second nominal clock resolution found.  Is that intended?" \
    137           "If so, compile with the -DOK_TO_USE_1S_CLOCK option."
    138 #  endif
    139   tv->tv_sec = time (NULL);
    140   tv->tv_usec = 0;
    141 
    142 # endif
    143 
    144   return 0;
    145 
    146 #endif
    147 }
    148