lib/time.in.h

   1 /* A more-standard <time.h>.
   2
   3    Copyright (C) 2007-2021 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 2, 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 <https://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.  (However, skip this for MinGW as it treats __need_time_t
  26    incompatibly.)  Also, Solaris 8 <time.h> eventually includes itself
  27    recursively; if that is happening, just include the system <time.h>
  28    without adding our own declarations.  */
  29 #if (((defined __need_time_t || defined __need_clock_t \
  30        || defined __need_timespec)                     \
  31       && !defined __MINGW32__)                         \
  32      || defined _@GUARD_PREFIX@_TIME_H)
  33
  34 # @INCLUDE_NEXT@ @NEXT_TIME_H@
  35
  36 #else
  37
  38 # define _@GUARD_PREFIX@_TIME_H
  39
  40 /* mingw's <time.h> provides the functions asctime_r, ctime_r, gmtime_r,
  41    localtime_r only if <unistd.h> or <pthread.h> has been included before.  */
  42 # if defined __MINGW32__
  43 #  include <unistd.h>
  44 # endif
  45
  46 # @INCLUDE_NEXT@ @NEXT_TIME_H@
  47
  48 /* NetBSD 5.0 mis-defines NULL.  */
  49 # include <stddef.h>
  50
  51 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
  52
  53 /* The definition of _GL_ARG_NONNULL is copied here.  */
  54
  55 /* The definition of _GL_WARN_ON_USE is copied here.  */
  56
  57 /* Some systems don't define struct timespec (e.g., AIX 4.1).
  58    Or they define it with the wrong member names or define it in <sys/time.h>
  59    (e.g., FreeBSD circa 1997).  Stock Mingw prior to 3.0 does not define it,
  60    but the pthreads-win32 library defines it in <pthread.h>.  */
  61 # if ! @TIME_H_DEFINES_STRUCT_TIMESPEC@
  62 #  if @SYS_TIME_H_DEFINES_STRUCT_TIMESPEC@
  63 #   include <sys/time.h>
  64 #  elif @PTHREAD_H_DEFINES_STRUCT_TIMESPEC@
  65 #   include <pthread.h>
  66 #  elif @UNISTD_H_DEFINES_STRUCT_TIMESPEC@
  67 #   include <unistd.h>
  68 #  else
  69
  70 #   ifdef __cplusplus
  71 extern "C" {
  72 #   endif
  73
  74 #   if !GNULIB_defined_struct_timespec
  75 #    undef timespec
  76 #    define timespec rpl_timespec
  77 struct timespec
  78 {
  79   time_t tv_sec;
  80   long int tv_nsec;
  81 };
  82 #    define GNULIB_defined_struct_timespec 1
  83 #   endif
  84
  85 #   ifdef __cplusplus
  86 }
  87 #   endif
  88
  89 #  endif
  90 # endif
  91
  92 # if !GNULIB_defined_struct_time_t_must_be_integral
  93 /* https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_types.h.html
  94    requires time_t to be an integer type, even though C99 permits floating
  95    point.  We don't know of any implementation that uses floating
  96    point, and it is much easier to write code that doesn't have to
  97    worry about that corner case, so we force the issue.  */
  98 struct __time_t_must_be_integral {
  99   unsigned int __floating_time_t_unsupported : (time_t) 1;
 100 };
 101 #  define GNULIB_defined_struct_time_t_must_be_integral 1
 102 # endif
 103
 104 /* Define TIME_UTC, a positive integer constant used for timespec_get().  */
 105 # if ! @TIME_H_DEFINES_TIME_UTC@
 106 #  if !GNULIB_defined_TIME_UTC
 107 #   define TIME_UTC 1
 108 #   define GNULIB_defined_TIME_UTC 1
 109 #  endif
 110 # endif
 111
 112 /* Set *TS to the current time, and return BASE.
 113    Upon failure, return 0.  */
 114 # if @GNULIB_TIMESPEC_GET@
 115 #  if ! @HAVE_TIMESPEC_GET@
 116 _GL_FUNCDECL_SYS (timespec_get, int, (struct timespec *ts, int base)
 117                                      _GL_ARG_NONNULL ((1)));
 118 #  endif
 119 _GL_CXXALIAS_SYS (timespec_get, int, (struct timespec *ts, int base));
 120 _GL_CXXALIASWARN (timespec_get);
 121 # endif
 122
 123 /* Sleep for at least RQTP seconds unless interrupted,  If interrupted,
 124    return -1 and store the remaining time into RMTP.  See
 125    <https://pubs.opengroup.org/onlinepubs/9699919799/functions/nanosleep.html>.  */
 126 # if @GNULIB_NANOSLEEP@
 127 #  if @REPLACE_NANOSLEEP@
 128 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 129 #    define nanosleep rpl_nanosleep
 130 #   endif
 131 _GL_FUNCDECL_RPL (nanosleep, int,
 132                   (struct timespec const *__rqtp, struct timespec *__rmtp)
 133                   _GL_ARG_NONNULL ((1)));
 134 _GL_CXXALIAS_RPL (nanosleep, int,
 135                   (struct timespec const *__rqtp, struct timespec *__rmtp));
 136 #  else
 137 #   if ! @HAVE_NANOSLEEP@
 138 _GL_FUNCDECL_SYS (nanosleep, int,
 139                   (struct timespec const *__rqtp, struct timespec *__rmtp)
 140                   _GL_ARG_NONNULL ((1)));
 141 #   endif
 142 _GL_CXXALIAS_SYS (nanosleep, int,
 143                   (struct timespec const *__rqtp, struct timespec *__rmtp));
 144 #  endif
 145 _GL_CXXALIASWARN (nanosleep);
 146 # endif
 147
 148 /* Initialize time conversion information.  */
 149 # if @GNULIB_TZSET@
 150 #  if @REPLACE_TZSET@
 151 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 152 #    undef tzset
 153 #    define tzset rpl_tzset
 154 #   endif
 155 _GL_FUNCDECL_RPL (tzset, void, (void));
 156 _GL_CXXALIAS_RPL (tzset, void, (void));
 157 #  elif defined _WIN32 && !defined __CYGWIN__
 158 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 159 #    undef tzset
 160 #    define tzset _tzset
 161 #   endif
 162 _GL_CXXALIAS_MDA (tzset, void, (void));
 163 #  else
 164 _GL_CXXALIAS_SYS (tzset, void, (void));
 165 #  endif
 166 _GL_CXXALIASWARN (tzset);
 167 # elif @GNULIB_MDA_TZSET@
 168 /* On native Windows, map 'tzset' to '_tzset', so that -loldnames is not
 169    required.  In C++ with GNULIB_NAMESPACE, avoid differences between
 170    platforms by defining GNULIB_NAMESPACE::tzset always.  */
 171 #  if defined _WIN32 && !defined __CYGWIN__
 172 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 173 #    undef tzset
 174 #    define tzset _tzset
 175 #   endif
 176 _GL_CXXALIAS_MDA (tzset, void, (void));
 177 #  else
 178 _GL_CXXALIAS_SYS (tzset, void, (void));
 179 #  endif
 180 _GL_CXXALIASWARN (tzset);
 181 # endif
 182
 183 /* Return the 'time_t' representation of TP and normalize TP.  */
 184 # if @GNULIB_MKTIME@
 185 #  if @REPLACE_MKTIME@
 186 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 187 #    define mktime rpl_mktime
 188 #   endif
 189 _GL_FUNCDECL_RPL (mktime, time_t, (struct tm *__tp) _GL_ARG_NONNULL ((1)));
 190 _GL_CXXALIAS_RPL (mktime, time_t, (struct tm *__tp));
 191 #  else
 192 _GL_CXXALIAS_SYS (mktime, time_t, (struct tm *__tp));
 193 #  endif
 194 #  if __GLIBC__ >= 2
 195 _GL_CXXALIASWARN (mktime);
 196 #  endif
 197 # endif
 198
 199 /* Convert TIMER to RESULT, assuming local time and UTC respectively.  See
 200    <https://pubs.opengroup.org/onlinepubs/9699919799/functions/localtime_r.html> and
 201    <https://pubs.opengroup.org/onlinepubs/9699919799/functions/gmtime_r.html>.  */
 202 # if @GNULIB_TIME_R@
 203 #  if @REPLACE_LOCALTIME_R@
 204 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 205 #    undef localtime_r
 206 #    define localtime_r rpl_localtime_r
 207 #   endif
 208 _GL_FUNCDECL_RPL (localtime_r, struct tm *, (time_t const *restrict __timer,
 209                                              struct tm *restrict __result)
 210                                             _GL_ARG_NONNULL ((1, 2)));
 211 _GL_CXXALIAS_RPL (localtime_r, struct tm *, (time_t const *restrict __timer,
 212                                              struct tm *restrict __result));
 213 #  else
 214 #   if ! @HAVE_DECL_LOCALTIME_R@
 215 _GL_FUNCDECL_SYS (localtime_r, struct tm *, (time_t const *restrict __timer,
 216                                              struct tm *restrict __result)
 217                                             _GL_ARG_NONNULL ((1, 2)));
 218 #   endif
 219 _GL_CXXALIAS_SYS (localtime_r, struct tm *, (time_t const *restrict __timer,
 220                                              struct tm *restrict __result));
 221 #  endif
 222 #  if @HAVE_DECL_LOCALTIME_R@
 223 _GL_CXXALIASWARN (localtime_r);
 224 #  endif
 225 #  if @REPLACE_LOCALTIME_R@
 226 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 227 #    undef gmtime_r
 228 #    define gmtime_r rpl_gmtime_r
 229 #   endif
 230 _GL_FUNCDECL_RPL (gmtime_r, struct tm *, (time_t const *restrict __timer,
 231                                           struct tm *restrict __result)
 232                                          _GL_ARG_NONNULL ((1, 2)));
 233 _GL_CXXALIAS_RPL (gmtime_r, struct tm *, (time_t const *restrict __timer,
 234                                           struct tm *restrict __result));
 235 #  else
 236 #   if ! @HAVE_DECL_LOCALTIME_R@
 237 _GL_FUNCDECL_SYS (gmtime_r, struct tm *, (time_t const *restrict __timer,
 238                                           struct tm *restrict __result)
 239                                          _GL_ARG_NONNULL ((1, 2)));
 240 #   endif
 241 _GL_CXXALIAS_SYS (gmtime_r, struct tm *, (time_t const *restrict __timer,
 242                                           struct tm *restrict __result));
 243 #  endif
 244 #  if @HAVE_DECL_LOCALTIME_R@
 245 _GL_CXXALIASWARN (gmtime_r);
 246 #  endif
 247 # endif
 248
 249 /* Convert TIMER to RESULT, assuming local time and UTC respectively.  See
 250    <https://pubs.opengroup.org/onlinepubs/9699919799/functions/localtime.html> and
 251    <https://pubs.opengroup.org/onlinepubs/9699919799/functions/gmtime.html>.  */
 252 # if @GNULIB_LOCALTIME@ || @REPLACE_LOCALTIME@
 253 #  if @REPLACE_LOCALTIME@
 254 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 255 #    undef localtime
 256 #    define localtime rpl_localtime
 257 #   endif
 258 _GL_FUNCDECL_RPL (localtime, struct tm *, (time_t const *__timer)
 259                                           _GL_ARG_NONNULL ((1)));
 260 _GL_CXXALIAS_RPL (localtime, struct tm *, (time_t const *__timer));
 261 #  else
 262 _GL_CXXALIAS_SYS (localtime, struct tm *, (time_t const *__timer));
 263 #  endif
 264 #  if __GLIBC__ >= 2
 265 _GL_CXXALIASWARN (localtime);
 266 #  endif
 267 # endif
 268
 269 # if 0 || @REPLACE_GMTIME@
 270 #  if @REPLACE_GMTIME@
 271 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 272 #    undef gmtime
 273 #    define gmtime rpl_gmtime
 274 #   endif
 275 _GL_FUNCDECL_RPL (gmtime, struct tm *, (time_t const *__timer)
 276                                        _GL_ARG_NONNULL ((1)));
 277 _GL_CXXALIAS_RPL (gmtime, struct tm *, (time_t const *__timer));
 278 #  else
 279 _GL_CXXALIAS_SYS (gmtime, struct tm *, (time_t const *__timer));
 280 #  endif
 281 _GL_CXXALIASWARN (gmtime);
 282 # endif
 283
 284 /* Parse BUF as a timestamp, assuming FORMAT specifies its layout, and store
 285    the resulting broken-down time into TM.  See
 286    <https://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html>.  */
 287 # if @GNULIB_STRPTIME@
 288 #  if ! @HAVE_STRPTIME@
 289 _GL_FUNCDECL_SYS (strptime, char *, (char const *restrict __buf,
 290                                      char const *restrict __format,
 291                                      struct tm *restrict __tm)
 292                                     _GL_ARG_NONNULL ((1, 2, 3)));
 293 #  endif
 294 _GL_CXXALIAS_SYS (strptime, char *, (char const *restrict __buf,
 295                                      char const *restrict __format,
 296                                      struct tm *restrict __tm));
 297 _GL_CXXALIASWARN (strptime);
 298 # endif
 299
 300 /* Convert *TP to a date and time string.  See
 301    <https://pubs.opengroup.org/onlinepubs/9699919799/functions/ctime.html>.  */
 302 # if @GNULIB_CTIME@
 303 #  if @REPLACE_CTIME@
 304 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 305 #    define ctime rpl_ctime
 306 #   endif
 307 _GL_FUNCDECL_RPL (ctime, char *, (time_t const *__tp)
 308                                  _GL_ARG_NONNULL ((1)));
 309 _GL_CXXALIAS_RPL (ctime, char *, (time_t const *__tp));
 310 #  else
 311 _GL_CXXALIAS_SYS (ctime, char *, (time_t const *__tp));
 312 #  endif
 313 #  if __GLIBC__ >= 2
 314 _GL_CXXALIASWARN (ctime);
 315 #  endif
 316 # endif
 317
 318 /* Convert *TP to a date and time string.  See
 319    <https://pubs.opengroup.org/onlinepubs/9699919799/functions/strftime.html>.  */
 320 # if @GNULIB_STRFTIME@
 321 #  if @REPLACE_STRFTIME@
 322 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 323 #    define strftime rpl_strftime
 324 #   endif
 325 _GL_FUNCDECL_RPL (strftime, size_t,
 326                   (char *restrict __buf, size_t __bufsize,
 327                    const char *restrict __fmt, const struct tm *restrict __tp)
 328                   _GL_ARG_NONNULL ((1, 3, 4)));
 329 _GL_CXXALIAS_RPL (strftime, size_t,
 330                   (char *restrict __buf, size_t __bufsize,
 331                    const char *restrict __fmt, const struct tm *restrict __tp));
 332 #  else
 333 _GL_CXXALIAS_SYS (strftime, size_t,
 334                   (char *restrict __buf, size_t __bufsize,
 335                    const char *restrict __fmt, const struct tm *restrict __tp));
 336 #  endif
 337 #  if __GLIBC__ >= 2
 338 _GL_CXXALIASWARN (strftime);
 339 #  endif
 340 # endif
 341
 342 # if defined _GNU_SOURCE && @GNULIB_TIME_RZ@ && ! @HAVE_TIMEZONE_T@
 343 typedef struct tm_zone *timezone_t;
 344 _GL_FUNCDECL_SYS (tzalloc, timezone_t, (char const *__name));
 345 _GL_CXXALIAS_SYS (tzalloc, timezone_t, (char const *__name));
 346 _GL_FUNCDECL_SYS (tzfree, void, (timezone_t __tz));
 347 _GL_CXXALIAS_SYS (tzfree, void, (timezone_t __tz));
 348 _GL_FUNCDECL_SYS (localtime_rz, struct tm *,
 349                   (timezone_t __tz, time_t const *restrict __timer,
 350                    struct tm *restrict __result) _GL_ARG_NONNULL ((2, 3)));
 351 _GL_CXXALIAS_SYS (localtime_rz, struct tm *,
 352                   (timezone_t __tz, time_t const *restrict __timer,
 353                    struct tm *restrict __result));
 354 _GL_FUNCDECL_SYS (mktime_z, time_t,
 355                   (timezone_t __tz, struct tm *restrict __result)
 356                   _GL_ARG_NONNULL ((2)));
 357 _GL_CXXALIAS_SYS (mktime_z, time_t,
 358                   (timezone_t __tz, struct tm *restrict __result));
 359 # endif
 360
 361 /* Convert TM to a time_t value, assuming UTC.  */
 362 # if @GNULIB_TIMEGM@
 363 #  if @REPLACE_TIMEGM@
 364 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 365 #    undef timegm
 366 #    define timegm rpl_timegm
 367 #   endif
 368 _GL_FUNCDECL_RPL (timegm, time_t, (struct tm *__tm) _GL_ARG_NONNULL ((1)));
 369 _GL_CXXALIAS_RPL (timegm, time_t, (struct tm *__tm));
 370 #  else
 371 #   if ! @HAVE_TIMEGM@
 372 _GL_FUNCDECL_SYS (timegm, time_t, (struct tm *__tm) _GL_ARG_NONNULL ((1)));
 373 #   endif
 374 _GL_CXXALIAS_SYS (timegm, time_t, (struct tm *__tm));
 375 #  endif
 376 _GL_CXXALIASWARN (timegm);
 377 # endif
 378
 379 /* Encourage applications to avoid unsafe functions that can overrun
 380    buffers when given outlandish struct tm values.  Portable
 381    applications should use strftime (or even sprintf) instead.  */
 382 # if defined GNULIB_POSIXCHECK
 383 #  undef asctime
 384 _GL_WARN_ON_USE (asctime, "asctime can overrun buffers in some cases - "
 385                  "better use strftime (or even sprintf) instead");
 386 # endif
 387 # if defined GNULIB_POSIXCHECK
 388 #  undef asctime_r
 389 _GL_WARN_ON_USE (asctime_r, "asctime_r can overrun buffers in some cases - "
 390                  "better use strftime (or even sprintf) instead");
 391 # endif
 392 # if defined GNULIB_POSIXCHECK
 393 #  undef ctime
 394 _GL_WARN_ON_USE (ctime, "ctime can overrun buffers in some cases - "
 395                  "better use strftime (or even sprintf) instead");
 396 # endif
 397 # if defined GNULIB_POSIXCHECK
 398 #  undef ctime_r
 399 _GL_WARN_ON_USE (ctime_r, "ctime_r can overrun buffers in some cases - "
 400                  "better use strftime (or even sprintf) instead");
 401 # endif
 402
 403 #endif