lib/time.in.h

   1 /* A more-standard <time.h>.
   2
   3    Copyright (C) 2007-2012 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #if __GNUC__ >= 3
  19 @PRAGMA_SYSTEM_HEADER@
  20 #endif
  21 @PRAGMA_COLUMNS@
  22
  23 /* Don't get in the way of glibc when it includes time.h merely to
  24    declare a few standard symbols, rather than to declare all the
  25    symbols.  Also, Solaris 8 <time.h> eventually includes itself
  26    recursively; if that is happening, just include the system <time.h>
  27    without adding our own declarations.  */
  28 #if (defined __need_time_t || defined __need_clock_t \
  29      || defined __need_timespec \
  30      || defined _@GUARD_PREFIX@_TIME_H)
  31
  32 # @INCLUDE_NEXT@ @NEXT_TIME_H@
  33
  34 #else
  35
  36 # define _@GUARD_PREFIX@_TIME_H
  37
  38 # @INCLUDE_NEXT@ @NEXT_TIME_H@
  39
  40 /* NetBSD 5.0 mis-defines NULL.  */
  41 # include <stddef.h>
  42
  43 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
  44
  45 /* The definition of _GL_ARG_NONNULL is copied here.  */
  46
  47 /* The definition of _GL_WARN_ON_USE is copied here.  */
  48
  49 /* Some systems don't define struct timespec (e.g., AIX 4.1, Ultrix 4.3).
  50    Or they define it with the wrong member names or define it in <sys/time.h>
  51    (e.g., FreeBSD circa 1997).  Stock Mingw does not define it, but the
  52    pthreads-win32 library defines it in <pthread.h>.  */
  53 # if ! @TIME_H_DEFINES_STRUCT_TIMESPEC@
  54 #  if @SYS_TIME_H_DEFINES_STRUCT_TIMESPEC@
  55 #   include <sys/time.h>
  56 #  elif @PTHREAD_H_DEFINES_STRUCT_TIMESPEC@
  57 #   include <pthread.h>
  58 /* The pthreads-win32 <pthread.h> also defines a couple of broken macros.  */
  59 #   undef asctime_r
  60 #   undef ctime_r
  61 #   undef gmtime_r
  62 #   undef localtime_r
  63 #   undef rand_r
  64 #   undef strtok_r
  65 #  else
  66
  67 #   ifdef __cplusplus
  68 extern "C" {
  69 #   endif
  70
  71 #   if !GNULIB_defined_struct_timespec
  72 #    undef timespec
  73 #    define timespec rpl_timespec
  74 struct timespec
  75 {
  76   time_t tv_sec;
  77   long int tv_nsec;
  78 };
  79 #    define GNULIB_defined_struct_timespec 1
  80 #   endif
  81
  82 #   ifdef __cplusplus
  83 }
  84 #   endif
  85
  86 #  endif
  87 # endif
  88
  89 # if !GNULIB_defined_struct_time_t_must_be_integral
  90 /* Per http://austingroupbugs.net/view.php?id=327, POSIX requires
  91    time_t to be an integer type, even though C99 permits floating
  92    point.  We don't know of any implementation that uses floating
  93    point, and it is much easier to write code that doesn't have to
  94    worry about that corner case, so we force the issue.  */
  95 struct __time_t_must_be_integral {
  96   unsigned int __floating_time_t_unsupported : (time_t) 1;
  97 };
  98 #  define GNULIB_defined_struct_time_t_must_be_integral 1
  99 # endif
 100
 101 /* Sleep for at least RQTP seconds unless interrupted,  If interrupted,
 102    return -1 and store the remaining time into RMTP.  See
 103    <http://www.opengroup.org/susv3xsh/nanosleep.html>.  */
 104 # if @GNULIB_NANOSLEEP@
 105 #  if @REPLACE_NANOSLEEP@
 106 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 107 #    define nanosleep rpl_nanosleep
 108 #   endif
 109 _GL_FUNCDECL_RPL (nanosleep, int,
 110                   (struct timespec const *__rqtp, struct timespec *__rmtp)
 111                   _GL_ARG_NONNULL ((1)));
 112 _GL_CXXALIAS_RPL (nanosleep, int,
 113                   (struct timespec const *__rqtp, struct timespec *__rmtp));
 114 #  else
 115 #   if ! @HAVE_NANOSLEEP@
 116 _GL_FUNCDECL_SYS (nanosleep, int,
 117                   (struct timespec const *__rqtp, struct timespec *__rmtp)
 118                   _GL_ARG_NONNULL ((1)));
 119 #   endif
 120 _GL_CXXALIAS_SYS (nanosleep, int,
 121                   (struct timespec const *__rqtp, struct timespec *__rmtp));
 122 #  endif
 123 _GL_CXXALIASWARN (nanosleep);
 124 # endif
 125
 126 /* Return the 'time_t' representation of TP and normalize TP.  */
 127 # if @GNULIB_MKTIME@
 128 #  if @REPLACE_MKTIME@
 129 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 130 #    define mktime rpl_mktime
 131 #   endif
 132 _GL_FUNCDECL_RPL (mktime, time_t, (struct tm *__tp) _GL_ARG_NONNULL ((1)));
 133 _GL_CXXALIAS_RPL (mktime, time_t, (struct tm *__tp));
 134 #  else
 135 _GL_CXXALIAS_SYS (mktime, time_t, (struct tm *__tp));
 136 #  endif
 137 _GL_CXXALIASWARN (mktime);
 138 # endif
 139
 140 /* Convert TIMER to RESULT, assuming local time and UTC respectively.  See
 141    <http://www.opengroup.org/susv3xsh/localtime_r.html> and
 142    <http://www.opengroup.org/susv3xsh/gmtime_r.html>.  */
 143 # if @GNULIB_TIME_R@
 144 #  if @REPLACE_LOCALTIME_R@
 145 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 146 #    undef localtime_r
 147 #    define localtime_r rpl_localtime_r
 148 #   endif
 149 _GL_FUNCDECL_RPL (localtime_r, struct tm *, (time_t const *restrict __timer,
 150                                              struct tm *restrict __result)
 151                                             _GL_ARG_NONNULL ((1, 2)));
 152 _GL_CXXALIAS_RPL (localtime_r, struct tm *, (time_t const *restrict __timer,
 153                                              struct tm *restrict __result));
 154 #  else
 155 #   if ! @HAVE_DECL_LOCALTIME_R@
 156 _GL_FUNCDECL_SYS (localtime_r, struct tm *, (time_t const *restrict __timer,
 157                                              struct tm *restrict __result)
 158                                             _GL_ARG_NONNULL ((1, 2)));
 159 #   endif
 160 _GL_CXXALIAS_SYS (localtime_r, struct tm *, (time_t const *restrict __timer,
 161                                              struct tm *restrict __result));
 162 #  endif
 163 #  if @HAVE_DECL_LOCALTIME_R@
 164 _GL_CXXALIASWARN (localtime_r);
 165 #  endif
 166 #  if @REPLACE_LOCALTIME_R@
 167 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 168 #    undef gmtime_r
 169 #    define gmtime_r rpl_gmtime_r
 170 #   endif
 171 _GL_FUNCDECL_RPL (gmtime_r, struct tm *, (time_t const *restrict __timer,
 172                                           struct tm *restrict __result)
 173                                          _GL_ARG_NONNULL ((1, 2)));
 174 _GL_CXXALIAS_RPL (gmtime_r, struct tm *, (time_t const *restrict __timer,
 175                                           struct tm *restrict __result));
 176 #  else
 177 #   if ! @HAVE_DECL_LOCALTIME_R@
 178 _GL_FUNCDECL_SYS (gmtime_r, struct tm *, (time_t const *restrict __timer,
 179                                           struct tm *restrict __result)
 180                                          _GL_ARG_NONNULL ((1, 2)));
 181 #   endif
 182 _GL_CXXALIAS_SYS (gmtime_r, struct tm *, (time_t const *restrict __timer,
 183                                           struct tm *restrict __result));
 184 #  endif
 185 #  if @HAVE_DECL_LOCALTIME_R@
 186 _GL_CXXALIASWARN (gmtime_r);
 187 #  endif
 188 # endif
 189
 190 /* Parse BUF as a time stamp, assuming FORMAT specifies its layout, and store
 191    the resulting broken-down time into TM.  See
 192    <http://www.opengroup.org/susv3xsh/strptime.html>.  */
 193 # if @GNULIB_STRPTIME@
 194 #  if ! @HAVE_STRPTIME@
 195 _GL_FUNCDECL_SYS (strptime, char *, (char const *restrict __buf,
 196                                      char const *restrict __format,
 197                                      struct tm *restrict __tm)
 198                                     _GL_ARG_NONNULL ((1, 2, 3)));
 199 #  endif
 200 _GL_CXXALIAS_SYS (strptime, char *, (char const *restrict __buf,
 201                                      char const *restrict __format,
 202                                      struct tm *restrict __tm));
 203 _GL_CXXALIASWARN (strptime);
 204 # endif
 205
 206 /* Convert TM to a time_t value, assuming UTC.  */
 207 # if @GNULIB_TIMEGM@
 208 #  if @REPLACE_TIMEGM@
 209 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 210 #    undef timegm
 211 #    define timegm rpl_timegm
 212 #   endif
 213 _GL_FUNCDECL_RPL (timegm, time_t, (struct tm *__tm) _GL_ARG_NONNULL ((1)));
 214 _GL_CXXALIAS_RPL (timegm, time_t, (struct tm *__tm));
 215 #  else
 216 #   if ! @HAVE_TIMEGM@
 217 _GL_FUNCDECL_SYS (timegm, time_t, (struct tm *__tm) _GL_ARG_NONNULL ((1)));
 218 #   endif
 219 _GL_CXXALIAS_SYS (timegm, time_t, (struct tm *__tm));
 220 #  endif
 221 _GL_CXXALIASWARN (timegm);
 222 # endif
 223
 224 /* Encourage applications to avoid unsafe functions that can overrun
 225    buffers when given outlandish struct tm values.  Portable
 226    applications should use strftime (or even sprintf) instead.  */
 227 # if defined GNULIB_POSIXCHECK
 228 #  undef asctime
 229 _GL_WARN_ON_USE (asctime, "asctime can overrun buffers in some cases - "
 230                  "better use strftime (or even sprintf) instead");
 231 # endif
 232 # if defined GNULIB_POSIXCHECK
 233 #  undef asctime_r
 234 _GL_WARN_ON_USE (asctime, "asctime_r can overrun buffers in some cases - "
 235                  "better use strftime (or even sprintf) instead");
 236 # endif
 237 # if defined GNULIB_POSIXCHECK
 238 #  undef ctime
 239 _GL_WARN_ON_USE (asctime, "ctime can overrun buffers in some cases - "
 240                  "better use strftime (or even sprintf) instead");
 241 # endif
 242 # if defined GNULIB_POSIXCHECK
 243 #  undef ctime_r
 244 _GL_WARN_ON_USE (asctime, "ctime_r can overrun buffers in some cases - "
 245                  "better use strftime (or even sprintf) instead");
 246 # endif
 247
 248 #endif