include/time.h

   1 /* Copyright (C) 1991-2003,2006,2009 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      ISO C99 Standard: 7.23 Date and time    <time.h>
  20  */
  21
  22 #ifndef _TIME_H
  23
  24 #if (! defined __need_time_t && !defined __need_clock_t && \
  25      ! defined __need_timespec)
  26 # define _TIME_H        1
  27 # include <features.h>
  28
  29 __BEGIN_DECLS
  30
  31 #endif
  32
  33 #ifdef  _TIME_H
  34 /* Get size_t and NULL from <stddef.h>.  */
  35 # define __need_size_t
  36 # define __need_NULL
  37 # include <stddef.h>
  38
  39 /* This defines CLOCKS_PER_SEC, which is the number of processor clock
  40    ticks per second.  */
  41 # include <bits/time.h>
  42
  43 /* This is the obsolete POSIX.1-1988 name for the same constant.  */
  44 # if !defined __STRICT_ANSI__ && !defined __USE_XOPEN2K
  45 #  ifndef CLK_TCK
  46 #   define CLK_TCK      CLOCKS_PER_SEC
  47 #  endif
  48 # endif
  49
  50 #endif /* <time.h> included.  */
  51
  52 #if !defined __clock_t_defined && (defined _TIME_H || defined __need_clock_t)
  53 # define __clock_t_defined      1
  54
  55 # include <bits/types.h>
  56
  57 __BEGIN_NAMESPACE_STD
  58 /* Returned by `clock'.  */
  59 typedef __clock_t clock_t;
  60 __END_NAMESPACE_STD
  61 #if defined __USE_XOPEN || defined __USE_POSIX || defined __USE_MISC
  62 __USING_NAMESPACE_STD(clock_t)
  63 #endif
  64
  65 #endif /* clock_t not defined and <time.h> or need clock_t.  */
  66 #undef  __need_clock_t
  67
  68 #if !defined __time_t_defined && (defined _TIME_H || defined __need_time_t)
  69 # define __time_t_defined       1
  70
  71 # include <bits/types.h>
  72
  73 __BEGIN_NAMESPACE_STD
  74 /* Returned by `time'.  */
  75 typedef __time_t time_t;
  76 __END_NAMESPACE_STD
  77 #if defined __USE_POSIX || defined __USE_MISC || defined __USE_SVID
  78 __USING_NAMESPACE_STD(time_t)
  79 #endif
  80
  81 #endif /* time_t not defined and <time.h> or need time_t.  */
  82 #undef  __need_time_t
  83
  84 #if !defined __clockid_t_defined && \
  85    ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_clockid_t)
  86 # define __clockid_t_defined    1
  87
  88 # include <bits/types.h>
  89
  90 /* Clock ID used in clock and timer functions.  */
  91 typedef __clockid_t clockid_t;
  92
  93 #endif /* clockid_t not defined and <time.h> or need clockid_t.  */
  94 #undef  __clockid_time_t
  95
  96 #if !defined __timer_t_defined && \
  97     ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_timer_t)
  98 # define __timer_t_defined      1
  99
 100 # include <bits/types.h>
 101
 102 /* Timer ID returned by `timer_create'.  */
 103 typedef __timer_t timer_t;
 104
 105 #endif /* timer_t not defined and <time.h> or need timer_t.  */
 106 #undef  __need_timer_t
 107
 108
 109 #if !defined __timespec_defined &&                              \
 110     ((defined _TIME_H &&                                        \
 111       (defined __USE_POSIX199309 || defined __USE_MISC)) ||     \
 112       defined __need_timespec)
 113 # define __timespec_defined     1
 114
 115 # include <bits/types.h>        /* This defines __time_t for us.  */
 116
 117 /* POSIX.1b structure for a time value.  This is like a `struct timeval' but
 118    has nanoseconds instead of microseconds.  */
 119 struct timespec
 120   {
 121     __time_t tv_sec;            /* Seconds.  */
 122     long int tv_nsec;           /* Nanoseconds.  */
 123   };
 124
 125 #endif /* timespec not defined and <time.h> or need timespec.  */
 126 #undef  __need_timespec
 127
 128
 129 #ifdef  _TIME_H
 130 __BEGIN_NAMESPACE_STD
 131 /* Used by other time functions.  */
 132 struct tm
 133 {
 134   int tm_sec;                   /* Seconds.     [0-60] (1 leap second) */
 135   int tm_min;                   /* Minutes.     [0-59] */
 136   int tm_hour;                  /* Hours.       [0-23] */
 137   int tm_mday;                  /* Day.         [1-31] */
 138   int tm_mon;                   /* Month.       [0-11] */
 139   int tm_year;                  /* Year - 1900.  */
 140   int tm_wday;                  /* Day of week. [0-6] */
 141   int tm_yday;                  /* Days in year.[0-365] */
 142   int tm_isdst;                 /* DST.         [-1/0/1]*/
 143
 144 #ifdef __UCLIBC_HAS_TM_EXTENSIONS__
 145 #ifdef  __USE_BSD
 146   long int tm_gmtoff;           /* Seconds east of UTC.  */
 147   const char *tm_zone;  /* Timezone abbreviation.  */
 148 #else
 149   long int __tm_gmtoff;         /* Seconds east of UTC.  */
 150   const char *__tm_zone;        /* Timezone abbreviation.  */
 151 #endif
 152 #endif /* __UCLIBC_HAS_TM_EXTENSIONS__ */
 153 };
 154 __END_NAMESPACE_STD
 155 #if defined __USE_XOPEN || defined __USE_POSIX || defined __USE_MISC
 156 __USING_NAMESPACE_STD(tm)
 157 #endif
 158
 159
 160 #ifdef __USE_POSIX199309
 161 /* POSIX.1b structure for timer start values and intervals.  */
 162 struct itimerspec
 163   {
 164     struct timespec it_interval;
 165     struct timespec it_value;
 166   };
 167
 168 /* We can use a simple forward declaration.  */
 169 struct sigevent;
 170
 171 #endif  /* POSIX.1b */
 172
 173 #ifdef __USE_XOPEN2K
 174 # ifndef __pid_t_defined
 175 typedef __pid_t pid_t;
 176 #  define __pid_t_defined
 177 # endif
 178 #endif
 179
 180
 181 __BEGIN_NAMESPACE_STD
 182 /* Time used by the program so far (user time + system time).
 183    The result / CLOCKS_PER_SECOND is program time in seconds.  */
 184 extern clock_t clock (void) __THROW;
 185
 186 /* Return the current time and put it in *TIMER if TIMER is not NULL.  */
 187 extern time_t time (time_t *__timer) __THROW;
 188 libc_hidden_proto(time)
 189
 190 #ifdef __UCLIBC_HAS_FLOATS__
 191 /* Return the difference between TIME1 and TIME0.  */
 192 extern double difftime (time_t __time1, time_t __time0)
 193      __THROW __attribute__ ((__const__));
 194 #endif /* __UCLIBC_HAS_FLOATS__ */
 195
 196 #ifdef _LIBC
 197 # define CLOCK_IDFIELD_SIZE     3
 198 #endif
 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 __END_NAMESPACE_STD
 211
 212 # ifdef __USE_XOPEN
 213 /* Parse S according to FORMAT and store binary time information in TP.
 214    The return value is a pointer to the first unparsed character in S.  */
 215 extern char *strptime (const char *__restrict __s,
 216                        const char *__restrict __fmt, struct tm *__tp)
 217      __THROW;
 218 # endif
 219
 220 #ifdef __UCLIBC_HAS_XLOCALE__
 221 # ifdef __USE_XOPEN2K8
 222 /* Similar to the two functions above but take the information from
 223    the provided locale and not the global locale.  */
 224 # include <xlocale.h>
 225
 226 extern size_t strftime_l (char *__restrict __s, size_t __maxsize,
 227                           const char *__restrict __format,
 228                           const struct tm *__restrict __tp,
 229                           __locale_t __loc) __THROW;
 230 libc_hidden_proto(strftime_l)
 231 # endif
 232
 233 # ifdef __USE_GNU
 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 libc_hidden_proto(stime)
 321 # endif
 322
 323
 324 /* Nonzero if YEAR is a leap year (every 4 years,
 325    except every 100th isn't, and every 400th is).  */
 326 # define __isleap(year) \
 327   ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
 328
 329
 330 # ifdef __USE_MISC
 331 /* Miscellaneous functions many Unices inherited from the public domain
 332    localtime package.  These are included only for compatibility.  */
 333
 334 /* Like `mktime', but for TP represents Universal Time, not local time.  */
 335 extern time_t timegm (struct tm *__tp) __THROW;
 336
 337 /* Another name for `mktime'.  */
 338 extern time_t timelocal (struct tm *__tp) __THROW;
 339
 340 /* Return the number of days in YEAR.  */
 341 extern int dysize (int __year) __THROW  __attribute__ ((__const__));
 342 # endif
 343
 344
 345 # ifdef __USE_POSIX199309
 346 #  if defined __UCLIBC_HAS_REALTIME__
 347 /* Pause execution for a number of nanoseconds.
 348
 349    This function is a cancellation point and therefore not marked with
 350    __THROW.  */
 351 extern int nanosleep (const struct timespec *__requested_time,
 352                       struct timespec *__remaining);
 353 libc_hidden_proto(nanosleep)
 354
 355
 356 /* Get resolution of clock CLOCK_ID.  */
 357 extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW;
 358 libc_hidden_proto(clock_getres)
 359
 360 /* Get current value of clock CLOCK_ID and store it in TP.  */
 361 extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
 362
 363 /* Set clock CLOCK_ID to value TP.  */
 364 extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp)
 365      __THROW;
 366 #  endif /* __UCLIBC_HAS_REALTIME__ */
 367
 368 #  if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
 369 #   ifdef __UCLIBC_HAS_THREADS_NATIVE__
 370 /* High-resolution sleep with the specified clock.
 371
 372    This function is a cancellation point and therefore not marked with
 373    __THROW.  */
 374 extern int clock_nanosleep (clockid_t __clock_id, int __flags,
 375                             const struct timespec *__req,
 376                             struct timespec *__rem);
 377
 378 /* Return clock ID for CPU-time clock.  */
 379 extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW;
 380 #   endif /* __UCLIBC_HAS_THREADS_NATIVE__ */
 381 #  endif
 382
 383 #  if defined __UCLIBC_HAS_REALTIME__
 384 /* Create new per-process timer using CLOCK_ID.  */
 385 extern int timer_create (clockid_t __clock_id,
 386                          struct sigevent *__restrict __evp,
 387                          timer_t *__restrict __timerid) __THROW;
 388
 389 /* Delete timer TIMERID.  */
 390 extern int timer_delete (timer_t __timerid) __THROW;
 391
 392 /* Set timer TIMERID to VALUE, returning old value in OVLAUE.  */
 393 extern int timer_settime (timer_t __timerid, int __flags,
 394                           const struct itimerspec *__restrict __value,
 395                           struct itimerspec *__restrict __ovalue) __THROW;
 396
 397 /* Get current value of timer TIMERID and store it in VLAUE.  */
 398 extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
 399      __THROW;
 400
 401 /* Get expiration overrun for timer TIMERID.  */
 402 extern int timer_getoverrun (timer_t __timerid) __THROW;
 403 #  endif /* __UCLIBC_HAS_REALTIME__ */
 404 # endif /* __USE_POSIX199309 */
 405
 406
 407 #ifdef __UCLIBC_MJN3_ONLY__
 408 #warning "mjn3 FIXME: a bunch of unimplemented function prototypes."
 409 # ifdef __USE_XOPEN_EXTENDED
 410 /* Set to one of the following values to indicate an error.
 411      1  the DATEMSK environment variable is null or undefined,
 412      2  the template file cannot be opened for reading,
 413      3  failed to get file status information,
 414      4  the template file is not a regular file,
 415      5  an error is encountered while reading the template file,
 416      6  memory allication failed (not enough memory available),
 417      7  there is no line in the template that matches the input,
 418      8  invalid input specification Example: February 31 or a time is
 419         specified that can not be represented in a time_t (representing
 420         the time in seconds since 00:00:00 UTC, January 1, 1970) */
 421 extern int getdate_err;
 422
 423 /* Parse the given string as a date specification and return a value
 424    representing the value.  The templates from the file identified by
 425    the environment variable DATEMSK are used.  In case of an error
 426    `getdate_err' is set.
 427
 428    This function is a possible cancellation points and therefore not
 429    marked with __THROW.  */
 430 extern struct tm *getdate (const char *__string);
 431 # endif
 432
 433 # ifdef __USE_GNU
 434 /* Since `getdate' is not reentrant because of the use of `getdate_err'
 435    and the static buffer to return the result in, we provide a thread-safe
 436    variant.  The functionality is the same.  The result is returned in
 437    the buffer pointed to by RESBUFP and in case of an error the return
 438    value is != 0 with the same values as given above for `getdate_err'.
 439
 440    This function is not part of POSIX and therefore no official
 441    cancellation point.  But due to similarity with an POSIX interface
 442    or due to the implementation it is a cancellation point and
 443    therefore not marked with __THROW.  */
 444 extern int getdate_r (const char *__restrict __string,
 445                       struct tm *__restrict __resbufp);
 446 # endif
 447 #endif /* __UCLIBC_MJN3_ONLY__ */
 448
 449 __END_DECLS
 450
 451 #endif /* <time.h> included.  */
 452
 453 #endif /* <time.h> not already included.  */