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annotate m4/gettimeofday.m4 @ 5611:87c42e194f4a

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Use an all-permissive copyright notice, recommended by RMS.
author Paul Eggert <eggert@cs.ucla.edu>
date Sun, 23 Jan 2005 08:06:57 +0000
parents f411b1e0c5bd
children d094f71e51d4
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1 #serial 6
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2
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3 # Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
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4 # This file is free software; the Free Software Foundation
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5 # gives unlimited permission to copy and/or distribute it,
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6 # with or without modifications, as long as this notice is preserved.
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7
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8 dnl From Jim Meyering.
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9 dnl
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10 dnl See if gettimeofday clobbers the static buffer that localtime uses
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11 dnl for its return value. The gettimeofday function from Mac OS X 10.0.4
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12 dnl (i.e., Darwin 1.3.7) has this problem.
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13 dnl
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14 dnl If it does, then arrange to use gettimeofday and localtime only via
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15 dnl the wrapper functions that work around the problem.
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16
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17 AC_DEFUN([AC_FUNC_GETTIMEOFDAY_CLOBBER],
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18 [
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19 AC_REQUIRE([AC_HEADER_TIME])
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20 AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer],
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21 jm_cv_func_gettimeofday_clobber,
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22 [AC_TRY_RUN([
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23 #include <stdio.h>
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24 #include <string.h>
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25
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26 #if TIME_WITH_SYS_TIME
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27 # include <sys/time.h>
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28 # include <time.h>
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29 #else
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30 # if HAVE_SYS_TIME_H
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31 # include <sys/time.h>
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32 # else
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33 # include <time.h>
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34 # endif
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35 #endif
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36
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37 #include <stdlib.h>
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38
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39 int
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40 main ()
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41 {
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42 time_t t = 0;
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43 struct tm *lt;
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44 struct tm saved_lt;
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45 struct timeval tv;
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46 lt = localtime (&t);
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47 saved_lt = *lt;
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48 gettimeofday (&tv, NULL);
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49 if (memcmp (lt, &saved_lt, sizeof (struct tm)) != 0)
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50 exit (1);
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51
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52 exit (0);
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53 }
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54 ],
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55 jm_cv_func_gettimeofday_clobber=no,
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56 jm_cv_func_gettimeofday_clobber=yes,
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57 dnl When crosscompiling, assume it is broken.
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58 jm_cv_func_gettimeofday_clobber=yes)
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59 ])
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60 if test $jm_cv_func_gettimeofday_clobber = yes; then
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61 gl_GETTIMEOFDAY_REPLACE_LOCALTIME
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62
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63 AC_DEFINE(gettimeofday, rpl_gettimeofday,
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64 [Define to rpl_gettimeofday if the replacement function should be used.])
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65 AC_DEFINE(GETTIMEOFDAY_CLOBBERS_LOCALTIME_BUFFER, 1,
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66 [Define if gettimeofday clobbers localtime's static buffer.])
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67 gl_PREREQ_GETTIMEOFDAY
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68 fi
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69 ])
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70
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71 AC_DEFUN([gl_GETTIMEOFDAY_REPLACE_LOCALTIME], [
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72 AC_LIBOBJ(gettimeofday)
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73 AC_DEFINE(gmtime, rpl_gmtime,
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74 [Define to rpl_gmtime if the replacement function should be used.])
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75 AC_DEFINE(localtime, rpl_localtime,
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76 [Define to rpl_localtime if the replacement function should be used.])
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77 ])
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78
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79 # Prerequisites of lib/gettimeofday.c.
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80 AC_DEFUN([gl_PREREQ_GETTIMEOFDAY], [
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81 AC_REQUIRE([AC_HEADER_TIME])
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82 ])