1 /* Copyright (C) 1991-2003,2006,2009 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 __need_timespec)
114 # define __timespec_defined 1
116 # include <bits/types.h> /* This defines __time_t for us. */
118 /* POSIX.1b structure for a time value. This is like a `struct timeval' but
119 has nanoseconds instead of microseconds. */
122 __time_t tv_sec; /* Seconds. */
123 long int tv_nsec; /* Nanoseconds. */
126 #endif /* timespec not defined and <time.h> or need timespec. */
127 #undef __need_timespec
131 __BEGIN_NAMESPACE_STD
132 /* Used by other time functions. */
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]*/
145 #ifdef __UCLIBC_HAS_TM_EXTENSIONS__
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. */
153 #endif /* __UCLIBC_HAS_TM_EXTENSIONS__ */
156 #if defined __USE_XOPEN || defined __USE_POSIX || defined __USE_MISC
157 __USING_NAMESPACE_STD(tm)
161 #ifdef __USE_POSIX199309
162 /* POSIX.1b structure for timer start values and intervals. */
165 struct timespec it_interval;
166 struct timespec it_value;
169 /* We can use a simple forward declaration. */
172 #endif /* POSIX.1b */
175 # ifndef __pid_t_defined
176 typedef __pid_t pid_t;
177 # define __pid_t_defined
182 __BEGIN_NAMESPACE_STD
183 /* Time used by the program so far (user time + system time).
184 The result / CLOCKS_PER_SECOND is program time in seconds. */
185 extern clock_t clock (void) __THROW;
187 /* Return the current time and put it in *TIMER if TIMER is not NULL. */
188 extern time_t time (time_t *__timer) __THROW;
189 libc_hidden_proto(time)
191 #ifdef __UCLIBC_HAS_FLOATS__
192 /* Return the difference between TIME1 and TIME0. */
193 extern double difftime (time_t __time1, time_t __time0)
194 __THROW __attribute__ ((__const__));
195 #endif /* __UCLIBC_HAS_FLOATS__ */
198 # define CLOCK_IDFIELD_SIZE 3
201 /* Return the `time_t' representation of TP and normalize TP. */
202 extern time_t mktime (struct tm *__tp) __THROW;
205 /* Format TP into S according to FORMAT.
206 Write no more than MAXSIZE characters and return the number
207 of characters written, or 0 if it would exceed MAXSIZE. */
208 extern size_t strftime (char *__restrict __s, size_t __maxsize,
209 __const char *__restrict __format,
210 __const struct tm *__restrict __tp) __THROW;
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)
221 #ifdef __UCLIBC_HAS_XLOCALE__
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;
231 libc_hidden_proto(strftime_l)
235 extern char *strptime_l (__const char *__restrict __s,
236 __const char *__restrict __fmt, struct tm *__tp,
237 __locale_t __loc) __THROW;
238 libc_hidden_proto(strptime_l)
243 __BEGIN_NAMESPACE_STD
244 /* Return the `struct tm' representation of *TIMER
245 in Universal Coordinated Time (aka Greenwich Mean Time). */
246 extern struct tm *gmtime (__const time_t *__timer) __THROW;
248 /* Return the `struct tm' representation
249 of *TIMER in the local timezone. */
250 extern struct tm *localtime (__const time_t *__timer) __THROW;
251 libc_hidden_proto(localtime)
254 # if defined __USE_POSIX || defined __USE_MISC
255 /* Return the `struct tm' representation of *TIMER in UTC,
256 using *TP to store the result. */
257 extern struct tm *gmtime_r (__const time_t *__restrict __timer,
258 struct tm *__restrict __tp) __THROW;
260 /* Return the `struct tm' representation of *TIMER in local time,
261 using *TP to store the result. */
262 extern struct tm *localtime_r (__const time_t *__restrict __timer,
263 struct tm *__restrict __tp) __THROW;
264 libc_hidden_proto(localtime_r)
265 # endif /* POSIX or misc */
267 __BEGIN_NAMESPACE_STD
268 /* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n"
269 that is the representation of TP in this format. */
270 extern char *asctime (__const struct tm *__tp) __THROW;
271 libc_hidden_proto(asctime)
273 /* Equivalent to `asctime (localtime (timer))'. */
274 extern char *ctime (__const time_t *__timer) __THROW;
275 libc_hidden_proto(ctime)
278 # if defined __USE_POSIX || defined __USE_MISC
279 /* Reentrant versions of the above functions. */
281 /* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n"
282 that is the representation of TP in this format. */
283 extern char *asctime_r (__const struct tm *__restrict __tp,
284 char *__restrict __buf) __THROW;
285 libc_hidden_proto(asctime_r)
287 /* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'. */
288 extern char *ctime_r (__const time_t *__restrict __timer,
289 char *__restrict __buf) __THROW;
290 # endif /* POSIX or misc */
293 /* Defined in localtime.c. */
294 #ifdef __UCLIBC_MJN3_ONLY__
295 #warning "mjn3 FIXME: __tzname, __daylight, and __timezone have a prototype but are not defined."
296 extern char *__tzname[2]; /* Current timezone names. */
297 extern int __daylight; /* If daylight-saving time is ever in use. */
298 extern long int __timezone; /* Seconds west of UTC. */
299 #endif /* __UCLIBC_MJN3_ONLY__ */
304 extern char *tzname[2];
306 /* Set time conversion information from the TZ environment variable.
307 If TZ is not defined, a locale-dependent default is used. */
308 extern void tzset (void) __THROW;
309 libc_hidden_proto(tzset)
312 # if defined __USE_SVID || defined __USE_XOPEN
314 extern long int timezone;
318 /* Set the system time to *WHEN.
319 This call is restricted to the superuser. */
320 extern int stime (__const time_t *__when) __THROW;
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))
331 /* Miscellaneous functions many Unices inherited from the public domain
332 localtime package. These are included only for compatibility. */
334 /* Like `mktime', but for TP represents Universal Time, not local time. */
335 extern time_t timegm (struct tm *__tp) __THROW;
337 /* Another name for `mktime'. */
338 extern time_t timelocal (struct tm *__tp) __THROW;
340 /* Return the number of days in YEAR. */
341 extern int dysize (int __year) __THROW __attribute__ ((__const__));
345 # ifdef __USE_POSIX199309
346 # if defined __UCLIBC_HAS_REALTIME__
347 /* Pause execution for a number of nanoseconds.
349 This function is a cancellation point and therefore not marked with
351 extern int nanosleep (__const struct timespec *__requested_time,
352 struct timespec *__remaining);
353 libc_hidden_proto(nanosleep)
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)
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;
363 /* Set clock CLOCK_ID to value TP. */
364 extern int clock_settime (clockid_t __clock_id, __const struct timespec *__tp)
366 # endif /* __UCLIBC_HAS_REALTIME__ */
368 # if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
369 # ifdef __UCLIBC_HAS_THREADS_NATIVE__
370 /* High-resolution sleep with the specified clock.
372 This function is a cancellation point and therefore not marked with
374 extern int clock_nanosleep (clockid_t __clock_id, int __flags,
375 __const struct timespec *__req,
376 struct timespec *__rem);
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__ */
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;
389 /* Delete timer TIMERID. */
390 extern int timer_delete (timer_t __timerid) __THROW;
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;
397 /* Get current value of timer TIMERID and store it in VLAUE. */
398 extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
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 */
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;
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.
428 This function is a possible cancellation points and therefore not
429 marked with __THROW. */
430 extern struct tm *getdate (__const char *__string);
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'.
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);
447 #endif /* __UCLIBC_MJN3_ONLY__ */
451 #endif /* <time.h> included. */
453 #endif /* <time.h> not already included. */