1/* Copyright (C) 1991-2014 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'. */
59typedef __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'. */
75typedef __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. */
91typedef __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'. */
103typedef __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 __USE_ISOC11)) \
113 || defined __need_timespec))
114# define __timespec_defined 1
115
116# include <bits/types.h> /* This defines __time_t for us. */
117
118/* POSIX.1b structure for a time value. This is like a `struct timeval' but
119 has nanoseconds instead of microseconds. */
120struct timespec
121 {
122 __time_t tv_sec; /* Seconds. */
123 __syscall_slong_t tv_nsec; /* Nanoseconds. */
124 };
125
126#endif /* timespec not defined and <time.h> or need timespec. */
127#undef __need_timespec
128
129
130#ifdef _TIME_H
131__BEGIN_NAMESPACE_STD
132/* Used by other time functions. */
133struct tm
134{
135 int tm_sec; /* Seconds. [0-60] (1 leap second) */
136 int tm_min; /* Minutes. [0-59] */
137 int tm_hour; /* Hours. [0-23] */
138 int tm_mday; /* Day. [1-31] */
139 int tm_mon; /* Month. [0-11] */
140 int tm_year; /* Year - 1900. */
141 int tm_wday; /* Day of week. [0-6] */
142 int tm_yday; /* Days in year.[0-365] */
143 int tm_isdst; /* DST. [-1/0/1]*/
144
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};
153__END_NAMESPACE_STD
154#if defined __USE_XOPEN || defined __USE_POSIX || defined __USE_MISC
155__USING_NAMESPACE_STD(tm)
156#endif
157
158
159# ifdef __USE_POSIX199309
160/* POSIX.1b structure for timer start values and intervals. */
161struct itimerspec
162 {
163 struct timespec it_interval;
164 struct timespec it_value;
165 };
166
167/* We can use a simple forward declaration. */
168struct sigevent;
169
170# endif /* POSIX.1b */
171
172# ifdef __USE_XOPEN2K
173# ifndef __pid_t_defined
174typedef __pid_t pid_t;
175# define __pid_t_defined
176# endif
177# endif
178
179
180# ifdef __USE_ISOC11
181/* Time base values for timespec_get. */
182# define TIME_UTC 1
183# endif
184
185
186__BEGIN_NAMESPACE_STD
187/* Time used by the program so far (user time + system time).
188 The result / CLOCKS_PER_SECOND is program time in seconds. */
189extern clock_t clock (void) __THROW;
190
191/* Return the current time and put it in *TIMER if TIMER is not NULL. */
192extern time_t time (time_t *__timer) __THROW;
193
194/* Return the difference between TIME1 and TIME0. */
195extern double difftime (time_t __time1, time_t __time0)
196 __THROW __attribute__ ((__const__));
197
198/* Return the `time_t' representation of TP and normalize TP. */
199extern time_t mktime (struct tm *__tp) __THROW;
200
201
202/* Format TP into S according to FORMAT.
203 Write no more than MAXSIZE characters and return the number
204 of characters written, or 0 if it would exceed MAXSIZE. */
205extern size_t strftime (char *__restrict __s, size_t __maxsize,
206 const char *__restrict __format,
207 const struct tm *__restrict __tp) __THROW;
208__END_NAMESPACE_STD
209
210# ifdef __USE_XOPEN
211/* Parse S according to FORMAT and store binary time information in TP.
212 The return value is a pointer to the first unparsed character in S. */
213extern char *strptime (const char *__restrict __s,
214 const char *__restrict __fmt, struct tm *__tp)
215 __THROW;
216# endif
217
218# ifdef __USE_XOPEN2K8
219/* Similar to the two functions above but take the information from
220 the provided locale and not the global locale. */
221# include <xlocale.h>
222
223extern size_t strftime_l (char *__restrict __s, size_t __maxsize,
224 const char *__restrict __format,
225 const struct tm *__restrict __tp,
226 __locale_t __loc) __THROW;
227# endif
228
229# ifdef __USE_GNU
230extern char *strptime_l (const char *__restrict __s,
231 const char *__restrict __fmt, struct tm *__tp,
232 __locale_t __loc) __THROW;
233# endif
234
235
236__BEGIN_NAMESPACE_STD
237/* Return the `struct tm' representation of *TIMER
238 in Universal Coordinated Time (aka Greenwich Mean Time). */
239extern struct tm *gmtime (const time_t *__timer) __THROW;
240
241/* Return the `struct tm' representation
242 of *TIMER in the local timezone. */
243extern struct tm *localtime (const time_t *__timer) __THROW;
244__END_NAMESPACE_STD
245
246# if defined __USE_POSIX || defined __USE_MISC
247/* Return the `struct tm' representation of *TIMER in UTC,
248 using *TP to store the result. */
249extern struct tm *gmtime_r (const time_t *__restrict __timer,
250 struct tm *__restrict __tp) __THROW;
251
252/* Return the `struct tm' representation of *TIMER in local time,
253 using *TP to store the result. */
254extern struct tm *localtime_r (const time_t *__restrict __timer,
255 struct tm *__restrict __tp) __THROW;
256# endif /* POSIX or misc */
257
258__BEGIN_NAMESPACE_STD
259/* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n"
260 that is the representation of TP in this format. */
261extern char *asctime (const struct tm *__tp) __THROW;
262
263/* Equivalent to `asctime (localtime (timer))'. */
264extern char *ctime (const time_t *__timer) __THROW;
265__END_NAMESPACE_STD
266
267# if defined __USE_POSIX || defined __USE_MISC
268/* Reentrant versions of the above functions. */
269
270/* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n"
271 that is the representation of TP in this format. */
272extern char *asctime_r (const struct tm *__restrict __tp,
273 char *__restrict __buf) __THROW;
274
275/* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'. */
276extern char *ctime_r (const time_t *__restrict __timer,
277 char *__restrict __buf) __THROW;
278# endif /* POSIX or misc */
279
280
281/* Defined in localtime.c. */
282extern char *__tzname[2]; /* Current timezone names. */
283extern int __daylight; /* If daylight-saving time is ever in use. */
284extern long int __timezone; /* Seconds west of UTC. */
285
286
287# ifdef __USE_POSIX
288/* Same as above. */
289extern char *tzname[2];
290
291/* Set time conversion information from the TZ environment variable.
292 If TZ is not defined, a locale-dependent default is used. */
293extern void tzset (void) __THROW;
294# endif
295
296# if defined __USE_SVID || defined __USE_XOPEN
297extern int daylight;
298extern long int timezone;
299# endif
300
301# ifdef __USE_SVID
302/* Set the system time to *WHEN.
303 This call is restricted to the superuser. */
304extern int stime (const time_t *__when) __THROW;
305# endif
306
307
308/* Nonzero if YEAR is a leap year (every 4 years,
309 except every 100th isn't, and every 400th is). */
310# define __isleap(year) \
311 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
312
313
314# ifdef __USE_MISC
315/* Miscellaneous functions many Unices inherited from the public domain
316 localtime package. These are included only for compatibility. */
317
318/* Like `mktime', but for TP represents Universal Time, not local time. */
319extern time_t timegm (struct tm *__tp) __THROW;
320
321/* Another name for `mktime'. */
322extern time_t timelocal (struct tm *__tp) __THROW;
323
324/* Return the number of days in YEAR. */
325extern int dysize (int __year) __THROW __attribute__ ((__const__));
326# endif
327
328
329# ifdef __USE_POSIX199309
330/* Pause execution for a number of nanoseconds.
331
332 This function is a cancellation point and therefore not marked with
333 __THROW. */
334extern int nanosleep (const struct timespec *__requested_time,
335 struct timespec *__remaining);
336
337
338/* Get resolution of clock CLOCK_ID. */
339extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW;
340
341/* Get current value of clock CLOCK_ID and store it in TP. */
342extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
343
344/* Set clock CLOCK_ID to value TP. */
345extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp)
346 __THROW;
347
348# ifdef __USE_XOPEN2K
349/* High-resolution sleep with the specified clock.
350
351 This function is a cancellation point and therefore not marked with
352 __THROW. */
353extern int clock_nanosleep (clockid_t __clock_id, int __flags,
354 const struct timespec *__req,
355 struct timespec *__rem);
356
357/* Return clock ID for CPU-time clock. */
358extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW;
359# endif
360
361
362/* Create new per-process timer using CLOCK_ID. */
363extern int timer_create (clockid_t __clock_id,
364 struct sigevent *__restrict __evp,
365 timer_t *__restrict __timerid) __THROW;
366
367/* Delete timer TIMERID. */
368extern int timer_delete (timer_t __timerid) __THROW;
369
370/* Set timer TIMERID to VALUE, returning old value in OVALUE. */
371extern int timer_settime (timer_t __timerid, int __flags,
372 const struct itimerspec *__restrict __value,
373 struct itimerspec *__restrict __ovalue) __THROW;
374
375/* Get current value of timer TIMERID and store it in VALUE. */
376extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
377 __THROW;
378
379/* Get expiration overrun for timer TIMERID. */
380extern int timer_getoverrun (timer_t __timerid) __THROW;
381# endif
382
383
384# ifdef __USE_ISOC11
385/* Set TS to calendar time based in time base BASE. */
386extern int timespec_get (struct timespec *__ts, int __base)
387 __THROW __nonnull ((1));
388# endif
389
390
391# ifdef __USE_XOPEN_EXTENDED
392/* Set to one of the following values to indicate an error.
393 1 the DATEMSK environment variable is null or undefined,
394 2 the template file cannot be opened for reading,
395 3 failed to get file status information,
396 4 the template file is not a regular file,
397 5 an error is encountered while reading the template file,
398 6 memory allication failed (not enough memory available),
399 7 there is no line in the template that matches the input,
400 8 invalid input specification Example: February 31 or a time is
401 specified that can not be represented in a time_t (representing
402 the time in seconds since 00:00:00 UTC, January 1, 1970) */
403extern int getdate_err;
404
405/* Parse the given string as a date specification and return a value
406 representing the value. The templates from the file identified by
407 the environment variable DATEMSK are used. In case of an error
408 `getdate_err' is set.
409
410 This function is a possible cancellation point and therefore not
411 marked with __THROW. */
412extern struct tm *getdate (const char *__string);
413# endif
414
415# ifdef __USE_GNU
416/* Since `getdate' is not reentrant because of the use of `getdate_err'
417 and the static buffer to return the result in, we provide a thread-safe
418 variant. The functionality is the same. The result is returned in
419 the buffer pointed to by RESBUFP and in case of an error the return
420 value is != 0 with the same values as given above for `getdate_err'.
421
422 This function is not part of POSIX and therefore no official
423 cancellation point. But due to similarity with an POSIX interface
424 or due to the implementation it is a cancellation point and
425 therefore not marked with __THROW. */
426extern int getdate_r (const char *__restrict __string,
427 struct tm *__restrict __resbufp);
428# endif
429
430__END_DECLS
431
432#endif /* <time.h> included. */
433
434#endif /* <time.h> not already included. */
435