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annotate m4/mktime.m4 @ 15308:a3ba680ad389

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strerror_r: fix OpenBSD behavior on 0 OpenBSD treats strerror_r(0,,) as a success, but with a message "Undefined error: 0"; while this is distinct from strerror_r(-1,,) returning "Unknown error: -1", it does not imply success. Meanwhile, if buf is short enough for ERANGE, then we can't use strstr to look for "Unknown" or "Undefined" in the resulting message, like we had been doing for strerror(). Fix this by shifting the burden - now the strerror-override code guarantees that 0 will have an override when needed. * lib/strerror-override.c (strerror_override): Also override 0 when needed. * lib/strerror-override.h (strerror_override): Likewise. * lib/strerror.c (strerror): Simplify, now that 0 override is done earlier. * lib/strerror_r.c (strerror_r): Likewise. * m4/strerror.m4 (gl_FUNC_STRERROR): Split detection of 0 behavior... (gl_FUNC_STRERROR_0): ...into new macro. * m4/strerror_r.m4 (gl_FUNC_STRERROR_R): Replace strerror_r if 0 is overridden. (gl_FUNC_STRERROR_R_WORKS): Avoid extra tests if 0 is broken. * modules/strerror-override (Files): Add strerror.m4. (configure.ac): Also provide override for 0 when needed. * doc/posix-functions/strerror.texi (strerror): Document this. * doc/posix-functions/perror.texi (perror): Likewise. Signed-off-by: Eric Blake <eblake@redhat.com>
author Eric Blake <eblake@redhat.com>
date Tue, 21 Jun 2011 08:50:51 -0600
parents d8eeaab555f5
children 8250f2777afc
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1 # serial 21
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2 dnl Copyright (C) 2002-2003, 2005-2007, 2009-2011 Free Software Foundation,
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3 dnl Inc.
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4 dnl This file is free software; the Free Software Foundation
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5 dnl gives unlimited permission to copy and/or distribute it,
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6 dnl with or without modifications, as long as this notice is preserved.
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7c1a6b73f48e An autoconf macro for its associated module.
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7
7c1a6b73f48e An autoconf macro for its associated module.
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8 dnl From Jim Meyering.
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9
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10 AC_DEFUN([gl_FUNC_MKTIME],
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11 [
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12 AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
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13
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14 dnl We don't use AC_FUNC_MKTIME any more, because it is no longer maintained
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15 dnl in Autoconf and because it invokes AC_LIBOBJ.
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16 AC_CHECK_HEADERS_ONCE([unistd.h])
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17 AC_CHECK_FUNCS_ONCE([alarm])
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18 AC_REQUIRE([gl_MULTIARCH])
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19 if test $APPLE_UNIVERSAL_BUILD = 1; then
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20 # A universal build on Apple MacOS X platforms.
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21 # The test result would be 'yes' in 32-bit mode and 'no' in 64-bit mode.
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22 # But we need a configuration result that is valid in both modes.
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23 gl_cv_func_working_mktime=no
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24 fi
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25 AC_CACHE_CHECK([for working mktime], [gl_cv_func_working_mktime],
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26 [AC_RUN_IFELSE(
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27 [AC_LANG_SOURCE(
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28 [[/* Test program from Paul Eggert and Tony Leneis. */
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29 #include <limits.h>
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30 #include <stdlib.h>
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31 #include <time.h>
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32
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33 #ifdef HAVE_UNISTD_H
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34 # include <unistd.h>
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35 #endif
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36
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37 #ifndef HAVE_ALARM
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38 # define alarm(X) /* empty */
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39 #endif
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40
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41 /* Work around redefinition to rpl_putenv by other config tests. */
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42 #undef putenv
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43
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44 static time_t time_t_max;
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45 static time_t time_t_min;
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46
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47 /* Values we'll use to set the TZ environment variable. */
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48 static char *tz_strings[] = {
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49 (char *) 0, "TZ=GMT0", "TZ=JST-9",
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50 "TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
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51 };
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52 #define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
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53
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54 /* Return 0 if mktime fails to convert a date in the spring-forward gap.
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55 Based on a problem report from Andreas Jaeger. */
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56 static int
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57 spring_forward_gap ()
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58 {
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59 /* glibc (up to about 1998-10-07) failed this test. */
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60 struct tm tm;
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61
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62 /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
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63 instead of "TZ=America/Vancouver" in order to detect the bug even
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64 on systems that don't support the Olson extension, or don't have the
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65 full zoneinfo tables installed. */
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66 putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
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67
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68 tm.tm_year = 98;
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69 tm.tm_mon = 3;
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70 tm.tm_mday = 5;
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71 tm.tm_hour = 2;
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72 tm.tm_min = 0;
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73 tm.tm_sec = 0;
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74 tm.tm_isdst = -1;
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75 return mktime (&tm) != (time_t) -1;
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76 }
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77
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78 static int
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79 mktime_test1 (time_t now)
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80 {
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81 struct tm *lt;
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82 return ! (lt = localtime (&now)) || mktime (lt) == now;
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83 }
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84
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85 static int
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86 mktime_test (time_t now)
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87 {
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88 return (mktime_test1 (now)
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89 && mktime_test1 ((time_t) (time_t_max - now))
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90 && mktime_test1 ((time_t) (time_t_min + now)));
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91 }
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92
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93 static int
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94 irix_6_4_bug ()
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95 {
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96 /* Based on code from Ariel Faigon. */
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97 struct tm tm;
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98 tm.tm_year = 96;
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99 tm.tm_mon = 3;
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100 tm.tm_mday = 0;
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101 tm.tm_hour = 0;
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102 tm.tm_min = 0;
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103 tm.tm_sec = 0;
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104 tm.tm_isdst = -1;
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105 mktime (&tm);
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106 return tm.tm_mon == 2 && tm.tm_mday == 31;
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107 }
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108
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109 static int
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110 bigtime_test (int j)
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111 {
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112 struct tm tm;
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113 time_t now;
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diff changeset
114 tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
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diff changeset
115 now = mktime (&tm);
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diff changeset
116 if (now != (time_t) -1)
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diff changeset
117 {
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diff changeset
118 struct tm *lt = localtime (&now);
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
119 if (! (lt
12421
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120 && lt->tm_year == tm.tm_year
e8d2c6fc33ad Use spaces for indentation, not tabs.
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121 && lt->tm_mon == tm.tm_mon
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diff changeset
122 && lt->tm_mday == tm.tm_mday
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diff changeset
123 && lt->tm_hour == tm.tm_hour
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
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diff changeset
124 && lt->tm_min == tm.tm_min
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Bruno Haible <bruno@clisp.org>
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diff changeset
125 && lt->tm_sec == tm.tm_sec
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Bruno Haible <bruno@clisp.org>
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diff changeset
126 && lt->tm_yday == tm.tm_yday
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127 && lt->tm_wday == tm.tm_wday
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diff changeset
128 && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
e8d2c6fc33ad Use spaces for indentation, not tabs.
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diff changeset
129 == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
e8d2c6fc33ad Use spaces for indentation, not tabs.
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130 return 0;
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131 }
7276
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132 return 1;
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133 }
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diff changeset
134
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diff changeset
135 static int
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diff changeset
136 year_2050_test ()
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diff changeset
137 {
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diff changeset
138 /* The correct answer for 2050-02-01 00:00:00 in Pacific time,
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diff changeset
139 ignoring leap seconds. */
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diff changeset
140 unsigned long int answer = 2527315200UL;
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diff changeset
141
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diff changeset
142 struct tm tm;
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diff changeset
143 time_t t;
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diff changeset
144 tm.tm_year = 2050 - 1900;
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diff changeset
145 tm.tm_mon = 2 - 1;
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diff changeset
146 tm.tm_mday = 1;
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
147 tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
148 tm.tm_isdst = -1;
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diff changeset
149
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diff changeset
150 /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
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diff changeset
151 instead of "TZ=America/Vancouver" in order to detect the bug even
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diff changeset
152 on systems that don't support the Olson extension, or don't have the
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
153 full zoneinfo tables installed. */
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
154 putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
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diff changeset
155
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
156 t = mktime (&tm);
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diff changeset
157
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
158 /* Check that the result is either a failure, or close enough
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Paul Eggert <eggert@cs.ucla.edu>
parents: 6275
diff changeset
159 to the correct answer that we can assume the discrepancy is
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Paul Eggert <eggert@cs.ucla.edu>
parents: 6275
diff changeset
160 due to leap seconds. */
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
161 return (t == (time_t) -1
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
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diff changeset
162 || (0 < t && answer - 120 <= t && t <= answer + 120));
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
163 }
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
164
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
165 int
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
166 main ()
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diff changeset
167 {
13918
d5a74c6ec06b Put more information about failed tests into the test return codes.
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diff changeset
168 int result = 0;
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
169 time_t t, delta;
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
170 int i, j;
14245
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
parents: 14079
diff changeset
171 int time_t_signed_magnitude = (time_t) ~ (time_t) 0 < (time_t) -1;
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
parents: 14079
diff changeset
172 int time_t_signed = ! ((time_t) 0 < (time_t) -1);
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
173
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
174 /* This test makes some buggy mktime implementations loop.
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
175 Give up after 60 seconds; a mktime slower than that
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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parents: 4107
diff changeset
176 isn't worth using anyway. */
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
177 alarm (60);
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
178
14245
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
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diff changeset
179 time_t_max = (! time_t_signed
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
parents: 14079
diff changeset
180 ? (time_t) -1
14249
52b55b447c02 TYPE_MAXIMUM: avoid theoretically undefined behavior
Paul Eggert <eggert@cs.ucla.edu>
parents: 14245
diff changeset
181 : ((((time_t) 1 << (sizeof (time_t) * CHAR_BIT - 2)) - 1)
52b55b447c02 TYPE_MAXIMUM: avoid theoretically undefined behavior
Paul Eggert <eggert@cs.ucla.edu>
parents: 14245
diff changeset
182 * 2 + 1));
14245
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
parents: 14079
diff changeset
183 time_t_min = (! time_t_signed
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
parents: 14079
diff changeset
184 ? (time_t) 0
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
parents: 14079
diff changeset
185 : time_t_signed_magnitude
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
parents: 14079
diff changeset
186 ? ~ (time_t) 0
14249
52b55b447c02 TYPE_MAXIMUM: avoid theoretically undefined behavior
Paul Eggert <eggert@cs.ucla.edu>
parents: 14245
diff changeset
187 : ~ time_t_max);
7734
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
parents: 7276
diff changeset
188
4348
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diff changeset
189 delta = time_t_max / 997; /* a suitable prime number */
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
190 for (i = 0; i < N_STRINGS; i++)
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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parents: 4107
diff changeset
191 {
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
192 if (tz_strings[i])
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
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diff changeset
193 putenv (tz_strings[i]);
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
194
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
195 for (t = 0; t <= time_t_max - delta; t += delta)
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
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diff changeset
196 if (! mktime_test (t))
13918
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
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diff changeset
197 result |= 1;
7276
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
Paul Eggert <eggert@cs.ucla.edu>
parents: 6275
diff changeset
198 if (! (mktime_test ((time_t) 1)
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
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diff changeset
199 && mktime_test ((time_t) (60 * 60))
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11744
diff changeset
200 && mktime_test ((time_t) (60 * 60 * 24))))
13918
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
parents: 13695
diff changeset
201 result |= 2;
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
202
7734
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
parents: 7276
diff changeset
203 for (j = 1; ; j <<= 1)
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11744
diff changeset
204 if (! bigtime_test (j))
13918
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
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diff changeset
205 result |= 4;
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
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diff changeset
206 else if (INT_MAX / 2 < j)
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11744
diff changeset
207 break;
7734
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
parents: 7276
diff changeset
208 if (! bigtime_test (INT_MAX))
13918
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
parents: 13695
diff changeset
209 result |= 8;
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
210 }
13918
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
parents: 13695
diff changeset
211 if (! irix_6_4_bug ())
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
parents: 13695
diff changeset
212 result |= 16;
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
parents: 13695
diff changeset
213 if (! spring_forward_gap ())
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
parents: 13695
diff changeset
214 result |= 32;
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
parents: 13695
diff changeset
215 if (! year_2050_test ())
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
parents: 13695
diff changeset
216 result |= 64;
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
parents: 13695
diff changeset
217 return result;
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
218 }]])],
15053
d8eeaab555f5 mktime: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14796
diff changeset
219 [gl_cv_func_working_mktime=yes],
d8eeaab555f5 mktime: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14796
diff changeset
220 [gl_cv_func_working_mktime=no],
d8eeaab555f5 mktime: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14796
diff changeset
221 [gl_cv_func_working_mktime=no])
d8eeaab555f5 mktime: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14796
diff changeset
222 ])
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
223
15053
d8eeaab555f5 mktime: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14796
diff changeset
224 if test $gl_cv_func_working_mktime = no; then
11742
531d4547f010 Fix compilation error when <ctime> is used and mktime is replaced.
Bruno Haible <bruno@clisp.org>
parents: 11068
diff changeset
225 REPLACE_MKTIME=1
11744
6fff409b3230 mktime: correct setting of REPLACE_MKTIME
Jim Meyering <meyering@redhat.com>
parents: 11742
diff changeset
226 else
6fff409b3230 mktime: correct setting of REPLACE_MKTIME
Jim Meyering <meyering@redhat.com>
parents: 11742
diff changeset
227 REPLACE_MKTIME=0
4107
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
228 fi
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
229 ])
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
230
14796
5fcbe73883bf New module 'mktime-internal'.
Bruno Haible <bruno@clisp.org>
parents: 14249
diff changeset
231 AC_DEFUN([gl_FUNC_MKTIME_INTERNAL], [
5fcbe73883bf New module 'mktime-internal'.
Bruno Haible <bruno@clisp.org>
parents: 14249
diff changeset
232 AC_REQUIRE([gl_FUNC_MKTIME])
5fcbe73883bf New module 'mktime-internal'.
Bruno Haible <bruno@clisp.org>
parents: 14249
diff changeset
233 if test $REPLACE_MKTIME = 0; then
5fcbe73883bf New module 'mktime-internal'.
Bruno Haible <bruno@clisp.org>
parents: 14249
diff changeset
234 dnl BeOS has __mktime_internal in libc, but other platforms don't.
5fcbe73883bf New module 'mktime-internal'.
Bruno Haible <bruno@clisp.org>
parents: 14249
diff changeset
235 AC_CHECK_FUNC([__mktime_internal],
5fcbe73883bf New module 'mktime-internal'.
Bruno Haible <bruno@clisp.org>
parents: 14249
diff changeset
236 [AC_DEFINE([mktime_internal], [__mktime_internal],
5fcbe73883bf New module 'mktime-internal'.
Bruno Haible <bruno@clisp.org>
parents: 14249
diff changeset
237 [Define to the real name of the mktime_internal function.])
5fcbe73883bf New module 'mktime-internal'.
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238 ],
5fcbe73883bf New module 'mktime-internal'.
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239 [dnl mktime works but it doesn't export __mktime_internal,
5fcbe73883bf New module 'mktime-internal'.
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240 dnl so we need to substitute our own mktime implementation.
5fcbe73883bf New module 'mktime-internal'.
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241 REPLACE_MKTIME=1
5fcbe73883bf New module 'mktime-internal'.
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242 ])
5fcbe73883bf New module 'mktime-internal'.
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parents: 14249
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243 fi
5fcbe73883bf New module 'mktime-internal'.
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parents: 14249
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244 ])
5fcbe73883bf New module 'mktime-internal'.
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245
4107
7c1a6b73f48e An autoconf macro for its associated module.
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parents:
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246 # Prerequisites of lib/mktime.c.
8427
8bd2ba354a25 mktime.c requires 'inline'.
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247 AC_DEFUN([gl_PREREQ_MKTIME],
8bd2ba354a25 mktime.c requires 'inline'.
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248 [
8bd2ba354a25 mktime.c requires 'inline'.
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249 AC_REQUIRE([AC_C_INLINE])
8bd2ba354a25 mktime.c requires 'inline'.
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parents: 7942
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250 ])