include/time.h

   1 /* Copyright (C) 1991-1999,2000,2001,2002,2003,2006
   2         Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /*
  21  *      ISO C99 Standard: 7.23 Date and time    <time.h>
  22  */
  23
  24 #ifndef _TIME_H
  25
  26 #if (! defined __need_time_t && !defined __need_clock_t && \
  27      ! defined __need_timespec)
  28 # define _TIME_H        1
  29 # include <features.h>
  30
  31 __BEGIN_DECLS
  32
  33 #endif
  34
  35 #ifdef  _TIME_H
  36 /* Get size_t and NULL from <stddef.h>.  */
  37 # define __need_size_t
  38 # define __need_NULL
  39 # include <stddef.h>
  40
  41 /* This defines CLOCKS_PER_SEC, which is the number of processor clock
  42    ticks per second.  */
  43 # include <bits/time.h>
  44
  45 /* This is the obsolete POSIX.1-1988 name for the same constant.  */
  46 # if !defined __STRICT_ANSI__ && !defined __USE_XOPEN2K
  47 #  ifndef CLK_TCK
  48 #   define CLK_TCK      CLOCKS_PER_SEC
  49 #  endif
  50 # endif
  51
  52 #endif /* <time.h> included.  */
  53
  54 #if !defined __clock_t_defined && (defined _TIME_H || defined __need_clock_t)
  55 # define __clock_t_defined      1
  56
  57 # include <bits/types.h>
  58
  59 __BEGIN_NAMESPACE_STD
  60 /* Returned by `clock'.  */
  61 typedef __clock_t clock_t;
  62 __END_NAMESPACE_STD
  63 #if defined __USE_XOPEN || defined __USE_POSIX || defined __USE_MISC
  64 __USING_NAMESPACE_STD(clock_t)
  65 #endif
  66
  67 #endif /* clock_t not defined and <time.h> or need clock_t.  */
  68 #undef  __need_clock_t
  69
  70 #if !defined __time_t_defined && (defined _TIME_H || defined __need_time_t)
  71 # define __time_t_defined       1
  72
  73 # include <bits/types.h>
  74
  75 __BEGIN_NAMESPACE_STD
  76 /* Returned by `time'.  */
  77 typedef __time_t time_t;
  78 __END_NAMESPACE_STD
  79 #if defined __USE_POSIX || defined __USE_MISC || defined __USE_SVID
  80 __USING_NAMESPACE_STD(time_t)
  81 #endif
  82
  83 #endif /* time_t not defined and <time.h> or need time_t.  */
  84 #undef  __need_time_t
  85
  86 #if !defined __clockid_t_defined && \
  87    ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_clockid_t)
  88 # define __clockid_t_defined    1
  89
  90 # include <bits/types.h>
  91
  92 /* Clock ID used in clock and timer functions.  */
  93 typedef __clockid_t clockid_t;
  94
  95 #endif /* clockid_t not defined and <time.h> or need clockid_t.  */
  96 #undef  __clockid_time_t
  97
  98 #if !defined __timer_t_defined && \
  99     ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_timer_t)
 100 # define __timer_t_defined      1
 101
 102 # include <bits/types.h>
 103
 104 /* Timer ID returned by `timer_create'.  */
 105 typedef __timer_t timer_t;
 106
 107 #endif /* timer_t not defined and <time.h> or need timer_t.  */
 108 #undef  __need_timer_t
 109
 110
 111 #if !defined __timespec_defined &&                              \
 112     ((defined _TIME_H &&                                        \
 113       (defined __USE_POSIX199309 || defined __USE_MISC)) ||     \
 114       defined __need_timespec)
 115 # define __timespec_defined     1
 116
 117 # include <bits/types.h>        /* This defines __time_t for us.  */
 118
 119 /* POSIX.1b structure for a time value.  This is like a `struct timeval' but
 120    has nanoseconds instead of microseconds.  */
 121 struct timespec
 122   {
 123     __time_t tv_sec;            /* Seconds.  */
 124     long int tv_nsec;           /* Nanoseconds.  */
 125   };
 126
 127 #endif /* timespec not defined and <time.h> or need timespec.  */
 128 #undef  __need_timespec
 129
 130
 131 #ifdef  _TIME_H
 132 __BEGIN_NAMESPACE_STD
 133 /* Used by other time functions.  */
 134 struct tm
 135 {
 136   int tm_sec;                   /* Seconds.     [0-60] (1 leap second) */
 137   int tm_min;                   /* Minutes.     [0-59] */
 138   int tm_hour;                  /* Hours.       [0-23] */
 139   int tm_mday;                  /* Day.         [1-31] */
 140   int tm_mon;                   /* Month.       [0-11] */
 141   int tm_year;                  /* Year - 1900.  */
 142   int tm_wday;                  /* Day of week. [0-6] */
 143   int tm_yday;                  /* Days in year.[0-365] */
 144   int tm_isdst;                 /* DST.         [-1/0/1]*/
 145
 146 #ifdef __UCLIBC_HAS_TM_EXTENSIONS__
 147 #ifdef  __USE_BSD
 148   long int tm_gmtoff;           /* Seconds east of UTC.  */
 149   __const char *tm_zone;        /* Timezone abbreviation.  */
 150 #else
 151   long int __tm_gmtoff;         /* Seconds east of UTC.  */
 152   __const char *__tm_zone;      /* Timezone abbreviation.  */
 153 #endif
 154 #endif /* __UCLIBC_HAS_TM_EXTENSIONS__ */
 155 };
 156 __END_NAMESPACE_STD
 157 #if defined __USE_XOPEN || defined __USE_POSIX || defined __USE_MISC
 158 __USING_NAMESPACE_STD(tm)
 159 #endif
 160
 161
 162 #ifdef __USE_POSIX199309
 163 /* POSIX.1b structure for timer start values and intervals.  */
 164 struct itimerspec
 165   {
 166     struct timespec it_interval;
 167     struct timespec it_value;
 168   };
 169
 170 /* We can use a simple forward declaration.  */
 171 struct sigevent;
 172
 173 #endif  /* POSIX.1b */
 174
 175 #ifdef __USE_XOPEN2K
 176 # ifndef __pid_t_defined
 177 typedef __pid_t pid_t;
 178 #  define __pid_t_defined
 179 # endif
 180 #endif
 181
 182
 183 __BEGIN_NAMESPACE_STD
 184 /* Time used by the program so far (user time + system time).
 185    The result / CLOCKS_PER_SECOND is program time in seconds.  */
 186 extern clock_t clock (void) __THROW;
 187
 188 /* Return the current time and put it in *TIMER if TIMER is not NULL.  */
 189 extern time_t time (time_t *__timer) __THROW;
 190 libc_hidden_proto(time)
 191
 192 #ifdef __UCLIBC_HAS_FLOATS__
 193 /* Return the difference between TIME1 and TIME0.  */
 194 extern double difftime (time_t __time1, time_t __time0)
 195      __THROW __attribute__ ((__const__));
 196 #endif /* __UCLIBC_HAS_FLOATS__ */
 197
 198 #define CLOCK_IDFIELD_SIZE      3
 199
 200 /* Return the `time_t' representation of TP and normalize TP.  */
 201 extern time_t mktime (struct tm *__tp) __THROW;
 202
 203
 204 /* Format TP into S according to FORMAT.
 205    Write no more than MAXSIZE characters and return the number
 206    of characters written, or 0 if it would exceed MAXSIZE.  */
 207 extern size_t strftime (char *__restrict __s, size_t __maxsize,
 208                         __const char *__restrict __format,
 209                         __const struct tm *__restrict __tp) __THROW;
 210 libc_hidden_proto(strftime)
 211 __END_NAMESPACE_STD
 212
 213 # ifdef __USE_XOPEN
 214 /* Parse S according to FORMAT and store binary time information in TP.
 215    The return value is a pointer to the first unparsed character in S.  */
 216 extern char *strptime (__const char *__restrict __s,
 217                        __const char *__restrict __fmt, struct tm *__tp)
 218      __THROW;
 219 libc_hidden_proto(strptime)
 220 # endif
 221
 222 #ifdef __UCLIBC_HAS_XLOCALE__
 223 # ifdef __USE_GNU
 224 /* Similar to the two functions above but take the information from
 225    the provided locale and not the global locale.  */
 226 # include <xlocale.h>
 227
 228 extern size_t strftime_l (char *__restrict __s, size_t __maxsize,
 229                           __const char *__restrict __format,
 230                           __const struct tm *__restrict __tp,
 231                           __locale_t __loc) __THROW;
 232 libc_hidden_proto(strftime_l)
 233
 234 extern char *strptime_l (__const char *__restrict __s,
 235                          __const char *__restrict __fmt, struct tm *__tp,
 236                          __locale_t __loc) __THROW;
 237 libc_hidden_proto(strptime_l)
 238 # endif
 239 #endif
 240
 241
 242 __BEGIN_NAMESPACE_STD
 243 /* Return the `struct tm' representation of *TIMER
 244    in Universal Coordinated Time (aka Greenwich Mean Time).  */
 245 extern struct tm *gmtime (__const time_t *__timer) __THROW;
 246
 247 /* Return the `struct tm' representation
 248    of *TIMER in the local timezone.  */
 249 extern struct tm *localtime (__const time_t *__timer) __THROW;
 250 libc_hidden_proto(localtime)
 251 __END_NAMESPACE_STD
 252
 253 # if defined __USE_POSIX || defined __USE_MISC
 254 /* Return the `struct tm' representation of *TIMER in UTC,
 255    using *TP to store the result.  */
 256 extern struct tm *gmtime_r (__const time_t *__restrict __timer,
 257                             struct tm *__restrict __tp) __THROW;
 258
 259 /* Return the `struct tm' representation of *TIMER in local time,
 260    using *TP to store the result.  */
 261 extern struct tm *localtime_r (__const time_t *__restrict __timer,
 262                                struct tm *__restrict __tp) __THROW;
 263 libc_hidden_proto(localtime_r)
 264 # endif /* POSIX or misc */
 265
 266 __BEGIN_NAMESPACE_STD
 267 /* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n"
 268    that is the representation of TP in this format.  */
 269 extern char *asctime (__const struct tm *__tp) __THROW;
 270 libc_hidden_proto(asctime)
 271
 272 /* Equivalent to `asctime (localtime (timer))'.  */
 273 extern char *ctime (__const time_t *__timer) __THROW;
 274 libc_hidden_proto(ctime)
 275 __END_NAMESPACE_STD
 276
 277 # if defined __USE_POSIX || defined __USE_MISC
 278 /* Reentrant versions of the above functions.  */
 279
 280 /* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n"
 281    that is the representation of TP in this format.  */
 282 extern char *asctime_r (__const struct tm *__restrict __tp,
 283                         char *__restrict __buf) __THROW;
 284 libc_hidden_proto(asctime_r)
 285
 286 /* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'.  */
 287 extern char *ctime_r (__const time_t *__restrict __timer,
 288                       char *__restrict __buf) __THROW;
 289 # endif /* POSIX or misc */
 290
 291
 292 /* Defined in localtime.c.  */
 293 #ifdef __UCLIBC_MJN3_ONLY__
 294 #warning "mjn3 FIXME: __tzname, __daylight, and __timezone have a prototype but are not defined."
 295 extern char *__tzname[2];       /* Current timezone names.  */
 296 extern int __daylight;          /* If daylight-saving time is ever in use.  */
 297 extern long int __timezone;     /* Seconds west of UTC.  */
 298 #endif /* __UCLIBC_MJN3_ONLY__ */
 299
 300
 301 # ifdef __USE_POSIX
 302 /* Same as above.  */
 303 extern char *tzname[2];
 304
 305 /* Set time conversion information from the TZ environment variable.
 306    If TZ is not defined, a locale-dependent default is used.  */
 307 extern void tzset (void) __THROW;
 308 libc_hidden_proto(tzset)
 309 # endif
 310
 311 # if defined __USE_SVID || defined __USE_XOPEN
 312 extern int daylight;
 313 extern long int timezone;
 314 # endif
 315
 316 # ifdef __USE_SVID
 317 /* Set the system time to *WHEN.
 318    This call is restricted to the superuser.  */
 319 extern int stime (__const time_t *__when) __THROW;
 320 # endif
 321
 322
 323 /* Nonzero if YEAR is a leap year (every 4 years,
 324    except every 100th isn't, and every 400th is).  */
 325 # define __isleap(year) \
 326   ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
 327
 328
 329 # ifdef __USE_MISC
 330 /* Miscellaneous functions many Unices inherited from the public domain
 331    localtime package.  These are included only for compatibility.  */
 332
 333 /* Like `mktime', but for TP represents Universal Time, not local time.  */
 334 extern time_t timegm (struct tm *__tp) __THROW;
 335
 336 /* Another name for `mktime'.  */
 337 extern time_t timelocal (struct tm *__tp) __THROW;
 338
 339 /* Return the number of days in YEAR.  */
 340 extern int dysize (int __year) __THROW  __attribute__ ((__const__));
 341 # endif
 342
 343
 344 # ifdef __USE_POSIX199309
 345 #  if defined __UCLIBC_HAS_REALTIME__
 346 /* Pause execution for a number of nanoseconds.
 347
 348    This function is a cancellation point and therefore not marked with
 349    __THROW.  */
 350 extern int nanosleep (__const struct timespec *__requested_time,
 351                       struct timespec *__remaining);
 352 libc_hidden_proto(nanosleep)
 353
 354
 355 /* Get resolution of clock CLOCK_ID.  */
 356 extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW;
 357 libc_hidden_proto(clock_getres)
 358
 359 /* Get current value of clock CLOCK_ID and store it in TP.  */
 360 extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
 361
 362 /* Set clock CLOCK_ID to value TP.  */
 363 extern int clock_settime (clockid_t __clock_id, __const struct timespec *__tp)
 364      __THROW;
 365 #  endif /* __UCLIBC_HAS_REALTIME__ */
 366 #  ifdef __UCLIBC_HAS_THREADS_NATIVE__
 367 #   if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
 368 /* High-resolution sleep with the specified clock.
 369
 370    This function is a cancellation point and therefore not marked with
 371    __THROW.  */
 372 extern int clock_nanosleep (clockid_t __clock_id, int __flags,
 373                             __const struct timespec *__req,
 374                             struct timespec *__rem);
 375
 376 /* Return clock ID for CPU-time clock.  */
 377 extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW;
 378 #   endif
 379 #  endif /* __UCLIBC_HAS_THREADS_NATIVE__ */
 380
 381 #  if defined __UCLIBC_HAS_REALTIME__
 382 /* Create new per-process timer using CLOCK_ID.  */
 383 extern int timer_create (clockid_t __clock_id,
 384                          struct sigevent *__restrict __evp,
 385                          timer_t *__restrict __timerid) __THROW;
 386
 387 /* Delete timer TIMERID.  */
 388 extern int timer_delete (timer_t __timerid) __THROW;
 389
 390 /* Set timer TIMERID to VALUE, returning old value in OVLAUE.  */
 391 extern int timer_settime (timer_t __timerid, int __flags,
 392                           __const struct itimerspec *__restrict __value,
 393                           struct itimerspec *__restrict __ovalue) __THROW;
 394
 395 /* Get current value of timer TIMERID and store it in VLAUE.  */
 396 extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
 397      __THROW;
 398
 399 /* Get expiration overrun for timer TIMERID.  */
 400 extern int timer_getoverrun (timer_t __timerid) __THROW;
 401 #  endif /* __UCLIBC_HAS_REALTIME__ */
 402 # endif /* __USE_POSIX199309 */
 403
 404
 405 #ifdef __UCLIBC_MJN3_ONLY__
 406 #warning "mjn3 FIXME: a bunch of unimplemented function prototypes."
 407 # ifdef __USE_XOPEN_EXTENDED
 408 /* Set to one of the following values to indicate an error.
 409      1  the DATEMSK environment variable is null or undefined,
 410      2  the template file cannot be opened for reading,
 411      3  failed to get file status information,
 412      4  the template file is not a regular file,
 413      5  an error is encountered while reading the template file,
 414      6  memory allication failed (not enough memory available),
 415      7  there is no line in the template that matches the input,
 416      8  invalid input specification Example: February 31 or a time is
 417         specified that can not be represented in a time_t (representing
 418         the time in seconds since 00:00:00 UTC, January 1, 1970) */
 419 extern int getdate_err;
 420
 421 /* Parse the given string as a date specification and return a value
 422    representing the value.  The templates from the file identified by
 423    the environment variable DATEMSK are used.  In case of an error
 424    `getdate_err' is set.
 425
 426    This function is a possible cancellation points and therefore not
 427    marked with __THROW.  */
 428 extern struct tm *getdate (__const char *__string);
 429 # endif
 430
 431 # ifdef __USE_GNU
 432 /* Since `getdate' is not reentrant because of the use of `getdate_err'
 433    and the static buffer to return the result in, we provide a thread-safe
 434    variant.  The functionality is the same.  The result is returned in
 435    the buffer pointed to by RESBUFP and in case of an error the return
 436    value is != 0 with the same values as given above for `getdate_err'.
 437
 438    This function is not part of POSIX and therefore no official
 439    cancellation point.  But due to similarity with an POSIX interface
 440    or due to the implementation it is a cancellation point and
 441    therefore not marked with __THROW.  */
 442 extern int getdate_r (__const char *__restrict __string,
 443                       struct tm *__restrict __resbufp);
 444 # endif
 445 #endif /* __UCLIBC_MJN3_ONLY__ */
 446
 447 __END_DECLS
 448
 449 #endif /* <time.h> included.  */
 450
 451 #endif /* <time.h> not already included.  */