1 /* Copyright (C) 1991-2003,2006,2009,2011,2012 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 * ISO C99 Standard: 7.23 Date and time <time.h>
25 #if (! defined __need_time_t && !defined __need_clock_t && \
26 ! defined __need_timespec)
28 # include <features.h>
35 /* Get size_t and NULL from <stddef.h>. */
36 # define __need_size_t
40 /* This defines CLOCKS_PER_SEC, which is the number of processor clock
42 # include <bits/time.h>
44 /* This is the obsolete POSIX.1-1988 name for the same constant. */
45 # if !defined __STRICT_ANSI__ && !defined __USE_XOPEN2K
47 # define CLK_TCK CLOCKS_PER_SEC
51 #endif /* <time.h> included. */
53 #if !defined __clock_t_defined && (defined _TIME_H || defined __need_clock_t)
54 # define __clock_t_defined 1
56 # include <bits/types.h>
59 /* Returned by `clock'. */
60 typedef __clock_t clock_t;
62 #if defined __USE_XOPEN || defined __USE_POSIX || defined __USE_MISC
63 __USING_NAMESPACE_STD(clock_t)
66 #endif /* clock_t not defined and <time.h> or need clock_t. */
69 #if !defined __time_t_defined && (defined _TIME_H || defined __need_time_t)
70 # define __time_t_defined 1
72 # include <bits/types.h>
75 /* Returned by `time'. */
76 typedef __time_t time_t;
78 #if defined __USE_POSIX || defined __USE_MISC || defined __USE_SVID
79 __USING_NAMESPACE_STD(time_t)
82 #endif /* time_t not defined and <time.h> or need time_t. */
85 #if !defined __clockid_t_defined && \
86 ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_clockid_t)
87 # define __clockid_t_defined 1
89 # include <bits/types.h>
91 /* Clock ID used in clock and timer functions. */
92 typedef __clockid_t clockid_t;
94 #endif /* clockid_t not defined and <time.h> or need clockid_t. */
95 #undef __clockid_time_t
97 #if !defined __timer_t_defined && \
98 ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_timer_t)
99 # define __timer_t_defined 1
101 # include <bits/types.h>
103 /* Timer ID returned by `timer_create'. */
104 typedef __timer_t timer_t;
106 #endif /* timer_t not defined and <time.h> or need timer_t. */
107 #undef __need_timer_t
110 #if (!defined __timespec_defined \
111 && ((defined _TIME_H \
112 && (defined __USE_POSIX199309 || defined __USE_MISC \
113 || defined __USE_ISOC11)) \
114 || defined __need_timespec))
115 # define __timespec_defined 1
117 # include <bits/types.h> /* This defines __time_t for us. */
119 /* POSIX.1b structure for a time value. This is like a `struct timeval' but
120 has nanoseconds instead of microseconds. */
123 __time_t tv_sec; /* Seconds. */
124 long int tv_nsec; /* Nanoseconds. */
127 #endif /* timespec not defined and <time.h> or need timespec. */
128 #undef __need_timespec
132 __BEGIN_NAMESPACE_STD
133 /* Used by other time functions. */
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]*/
147 long int tm_gmtoff; /* Seconds east of UTC. */
148 const char *tm_zone; /* Timezone abbreviation. */
150 long int __tm_gmtoff; /* Seconds east of UTC. */
151 const char *__tm_zone; /* Timezone abbreviation. */
155 #if defined __USE_XOPEN || defined __USE_POSIX || defined __USE_MISC
156 __USING_NAMESPACE_STD(tm)
160 # ifdef __USE_POSIX199309
161 /* POSIX.1b structure for timer start values and intervals. */
164 struct timespec it_interval;
165 struct timespec it_value;
168 /* We can use a simple forward declaration. */
171 # endif /* POSIX.1b */
173 # ifdef __USE_XOPEN2K
174 # ifndef __pid_t_defined
175 typedef __pid_t pid_t;
176 # define __pid_t_defined
182 /* Time base values for timespec_get. */
190 __BEGIN_NAMESPACE_STD
191 /* Time used by the program so far (user time + system time).
192 The result / CLOCKS_PER_SECOND is program time in seconds. */
193 extern clock_t clock (void) __THROW;
195 /* Return the current time and put it in *TIMER if TIMER is not NULL. */
196 extern time_t time (time_t *__timer) __THROW;
198 /* Return the difference between TIME1 and TIME0. */
199 extern double difftime (time_t __time1, time_t __time0)
200 __THROW __attribute__ ((__const__));
202 /* Return the `time_t' representation of TP and normalize TP. */
203 extern time_t mktime (struct tm *__tp) __THROW;
206 /* Format TP into S according to FORMAT.
207 Write no more than MAXSIZE characters and return the number
208 of characters written, or 0 if it would exceed MAXSIZE. */
209 extern size_t strftime (char *__restrict __s, size_t __maxsize,
210 const char *__restrict __format,
211 const struct tm *__restrict __tp) __THROW;
215 /* Parse S according to FORMAT and store binary time information in TP.
216 The return value is a pointer to the first unparsed character in S. */
217 extern char *strptime (const char *__restrict __s,
218 const char *__restrict __fmt, struct tm *__tp)
222 # ifdef __USE_XOPEN2K8
223 /* Similar to the two functions above but take the information from
224 the provided locale and not the global locale. */
225 # include <xlocale.h>
227 extern size_t strftime_l (char *__restrict __s, size_t __maxsize,
228 const char *__restrict __format,
229 const struct tm *__restrict __tp,
230 __locale_t __loc) __THROW;
234 extern char *strptime_l (const char *__restrict __s,
235 const char *__restrict __fmt, struct tm *__tp,
236 __locale_t __loc) __THROW;
240 __BEGIN_NAMESPACE_STD
241 /* Return the `struct tm' representation of *TIMER
242 in Universal Coordinated Time (aka Greenwich Mean Time). */
243 extern struct tm *gmtime (const time_t *__timer) __THROW;
245 /* Return the `struct tm' representation
246 of *TIMER in the local timezone. */
247 extern struct tm *localtime (const time_t *__timer) __THROW;
250 # if defined __USE_POSIX || defined __USE_MISC
251 /* Return the `struct tm' representation of *TIMER in UTC,
252 using *TP to store the result. */
253 extern struct tm *gmtime_r (const time_t *__restrict __timer,
254 struct tm *__restrict __tp) __THROW;
256 /* Return the `struct tm' representation of *TIMER in local time,
257 using *TP to store the result. */
258 extern struct tm *localtime_r (const time_t *__restrict __timer,
259 struct tm *__restrict __tp) __THROW;
260 # endif /* POSIX or misc */
262 __BEGIN_NAMESPACE_STD
263 /* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n"
264 that is the representation of TP in this format. */
265 extern char *asctime (const struct tm *__tp) __THROW;
267 /* Equivalent to `asctime (localtime (timer))'. */
268 extern char *ctime (const time_t *__timer) __THROW;
271 # if defined __USE_POSIX || defined __USE_MISC
272 /* Reentrant versions of the above functions. */
274 /* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n"
275 that is the representation of TP in this format. */
276 extern char *asctime_r (const struct tm *__restrict __tp,
277 char *__restrict __buf) __THROW;
279 /* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'. */
280 extern char *ctime_r (const time_t *__restrict __timer,
281 char *__restrict __buf) __THROW;
282 # endif /* POSIX or misc */
285 /* Defined in localtime.c. */
286 extern char *__tzname[2]; /* Current timezone names. */
287 extern int __daylight; /* If daylight-saving time is ever in use. */
288 extern long int __timezone; /* Seconds west of UTC. */
293 extern char *tzname[2];
295 /* Set time conversion information from the TZ environment variable.
296 If TZ is not defined, a locale-dependent default is used. */
297 extern void tzset (void) __THROW;
300 # if defined __USE_SVID || defined __USE_XOPEN
302 extern long int timezone;
306 /* Set the system time to *WHEN.
307 This call is restricted to the superuser. */
308 extern int stime (const time_t *__when) __THROW;
312 /* Nonzero if YEAR is a leap year (every 4 years,
313 except every 100th isn't, and every 400th is). */
314 # define __isleap(year) \
315 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
319 /* Miscellaneous functions many Unices inherited from the public domain
320 localtime package. These are included only for compatibility. */
322 /* Like `mktime', but for TP represents Universal Time, not local time. */
323 extern time_t timegm (struct tm *__tp) __THROW;
325 /* Another name for `mktime'. */
326 extern time_t timelocal (struct tm *__tp) __THROW;
328 /* Return the number of days in YEAR. */
329 extern int dysize (int __year) __THROW __attribute__ ((__const__));
333 # ifdef __USE_POSIX199309
334 /* Pause execution for a number of nanoseconds.
336 This function is a cancellation point and therefore not marked with
338 extern int nanosleep (const struct timespec *__requested_time,
339 struct timespec *__remaining);
342 /* Get resolution of clock CLOCK_ID. */
343 extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW;
345 /* Get current value of clock CLOCK_ID and store it in TP. */
346 extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
348 /* Set clock CLOCK_ID to value TP. */
349 extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp)
352 # ifdef __USE_XOPEN2K
353 /* High-resolution sleep with the specified clock.
355 This function is a cancellation point and therefore not marked with
357 extern int clock_nanosleep (clockid_t __clock_id, int __flags,
358 const struct timespec *__req,
359 struct timespec *__rem);
361 /* Return clock ID for CPU-time clock. */
362 extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW;
367 /* Set TS to calendar time based in time base BASE. */
368 extern int timespec_get (struct timespec *__ts, int __base)
369 __THROW __nonnull ((1));
373 /* Create new per-process timer using CLOCK_ID. */
374 extern int timer_create (clockid_t __clock_id,
375 struct sigevent *__restrict __evp,
376 timer_t *__restrict __timerid) __THROW;
378 /* Delete timer TIMERID. */
379 extern int timer_delete (timer_t __timerid) __THROW;
381 /* Set timer TIMERID to VALUE, returning old value in OVLAUE. */
382 extern int timer_settime (timer_t __timerid, int __flags,
383 const struct itimerspec *__restrict __value,
384 struct itimerspec *__restrict __ovalue) __THROW;
386 /* Get current value of timer TIMERID and store it in VLAUE. */
387 extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
390 /* Get expiration overrun for timer TIMERID. */
391 extern int timer_getoverrun (timer_t __timerid) __THROW;
395 # ifdef __USE_XOPEN_EXTENDED
396 /* Set to one of the following values to indicate an error.
397 1 the DATEMSK environment variable is null or undefined,
398 2 the template file cannot be opened for reading,
399 3 failed to get file status information,
400 4 the template file is not a regular file,
401 5 an error is encountered while reading the template file,
402 6 memory allication failed (not enough memory available),
403 7 there is no line in the template that matches the input,
404 8 invalid input specification Example: February 31 or a time is
405 specified that can not be represented in a time_t (representing
406 the time in seconds since 00:00:00 UTC, January 1, 1970) */
407 extern int getdate_err;
409 /* Parse the given string as a date specification and return a value
410 representing the value. The templates from the file identified by
411 the environment variable DATEMSK are used. In case of an error
412 `getdate_err' is set.
414 This function is a possible cancellation point and therefore not
415 marked with __THROW. */
416 extern struct tm *getdate (const char *__string);
420 /* Since `getdate' is not reentrant because of the use of `getdate_err'
421 and the static buffer to return the result in, we provide a thread-safe
422 variant. The functionality is the same. The result is returned in
423 the buffer pointed to by RESBUFP and in case of an error the return
424 value is != 0 with the same values as given above for `getdate_err'.
426 This function is not part of POSIX and therefore no official
427 cancellation point. But due to similarity with an POSIX interface
428 or due to the implementation it is a cancellation point and
429 therefore not marked with __THROW. */
430 extern int getdate_r (const char *__restrict __string,
431 struct tm *__restrict __resbufp);
436 #endif /* <time.h> included. */
438 #endif /* <time.h> not already included. */