1 /* Copyright (C) 1991-1999,2000,2001,2002,2003 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 /* POSIX.1b structure for a time value. This is like a `struct timeval' but
117 has nanoseconds instead of microseconds. */
120 __time_t tv_sec; /* Seconds. */
121 long int tv_nsec; /* Nanoseconds. */
124 #endif /* timespec not defined and <time.h> or need timespec. */
125 #undef __need_timespec
129 __BEGIN_NAMESPACE_STD
130 /* Used by other time functions. */
133 int tm_sec; /* Seconds. [0-60] (1 leap second) */
134 int tm_min; /* Minutes. [0-59] */
135 int tm_hour; /* Hours. [0-23] */
136 int tm_mday; /* Day. [1-31] */
137 int tm_mon; /* Month. [0-11] */
138 int tm_year; /* Year - 1900. */
139 int tm_wday; /* Day of week. [0-6] */
140 int tm_yday; /* Days in year.[0-365] */
141 int tm_isdst; /* DST. [-1/0/1]*/
143 #ifdef __UCLIBC_HAS_TM_EXTENSIONS__
145 long int tm_gmtoff; /* Seconds east of UTC. */
146 __const char *tm_zone; /* Timezone abbreviation. */
148 long int __tm_gmtoff; /* Seconds east of UTC. */
149 __const char *__tm_zone; /* Timezone abbreviation. */
151 char __tm_tzname[8]; /* In uClibc, tm_zone points to __tm_tzname. */
152 #endif /* __UCLIBC_HAS_TM_EXTENSIONS__ */
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 */
174 # ifndef __pid_t_defined
175 typedef __pid_t pid_t;
176 # define __pid_t_defined
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;
186 /* Return the current time and put it in *TIMER if TIMER is not NULL. */
187 extern time_t time (time_t *__timer) __THROW;
189 #ifdef __UCLIBC_HAS_FLOATS__
190 /* Return the difference between TIME1 and TIME0. */
191 extern double difftime (time_t __time1, time_t __time0)
192 __THROW __attribute__ ((__const__));
193 #endif /* __UCLIBC_HAS_FLOATS__ */
195 /* Return the `time_t' representation of TP and normalize TP. */
196 extern time_t mktime (struct tm *__tp) __THROW;
199 /* Format TP into S according to FORMAT.
200 Write no more than MAXSIZE characters and return the number
201 of characters written, or 0 if it would exceed MAXSIZE. */
202 extern size_t strftime (char *__restrict __s, size_t __maxsize,
203 __const char *__restrict __format,
204 __const struct tm *__restrict __tp) __THROW;
208 /* Parse S according to FORMAT and store binary time information in TP.
209 The return value is a pointer to the first unparsed character in S. */
210 extern char *strptime (__const char *__restrict __s,
211 __const char *__restrict __fmt, struct tm *__tp)
215 #ifdef __UCLIBC_HAS_XLOCALE__
217 /* Similar to the two functions above but take the information from
218 the provided locale and not the global locale. */
219 # include <xlocale.h>
221 extern size_t strftime_l (char *__restrict __s, size_t __maxsize,
222 __const char *__restrict __format,
223 __const struct tm *__restrict __tp,
224 __locale_t __loc) __THROW;
226 extern char *strptime_l (__const char *__restrict __s,
227 __const char *__restrict __fmt, struct tm *__tp,
228 __locale_t __loc) __THROW;
231 extern size_t __strftime_l (char *__restrict __s, size_t __maxsize,
232 __const char *__restrict __format,
233 __const struct tm *__restrict __tp,
234 __locale_t __loc) __THROW;
236 extern char *__strptime_l (__const char *__restrict __s,
237 __const char *__restrict __fmt, struct tm *__tp,
238 __locale_t __loc) __THROW;
244 __BEGIN_NAMESPACE_STD
245 /* Return the `struct tm' representation of *TIMER
246 in Universal Coordinated Time (aka Greenwich Mean Time). */
247 extern struct tm *gmtime (__const time_t *__timer) __THROW;
249 /* Return the `struct tm' representation
250 of *TIMER in the local timezone. */
251 extern struct tm *localtime (__const time_t *__timer) __THROW;
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 # endif /* POSIX or misc */
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;
271 /* Equivalent to `asctime (localtime (timer))'. */
272 extern char *ctime (__const time_t *__timer) __THROW;
275 # if defined __USE_POSIX || defined __USE_MISC
276 /* Reentrant versions of the above functions. */
278 /* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n"
279 that is the representation of TP in this format. */
280 extern char *asctime_r (__const struct tm *__restrict __tp,
281 char *__restrict __buf) __THROW;
283 /* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'. */
284 extern char *ctime_r (__const time_t *__restrict __timer,
285 char *__restrict __buf) __THROW;
286 # endif /* POSIX or misc */
289 /* Defined in localtime.c. */
290 extern char *__tzname[2]; /* Current timezone names. */
291 extern int __daylight; /* If daylight-saving time is ever in use. */
292 extern long int __timezone; /* Seconds west of UTC. */
297 extern char *tzname[2];
299 /* Set time conversion information from the TZ environment variable.
300 If TZ is not defined, a locale-dependent default is used. */
301 extern void tzset (void) __THROW;
304 # if defined __USE_SVID || defined __USE_XOPEN
306 extern long int timezone;
310 /* Set the system time to *WHEN.
311 This call is restricted to the superuser. */
312 extern int stime (__const time_t *__when) __THROW;
316 /* Nonzero if YEAR is a leap year (every 4 years,
317 except every 100th isn't, and every 400th is). */
318 # define __isleap(year) \
319 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
323 /* Miscellaneous functions many Unices inherited from the public domain
324 localtime package. These are included only for compatibility. */
327 /* Like `mktime', but for TP represents Universal Time, not local time. */
328 extern time_t timegm (struct tm *__tp) __THROW;
331 /* Another name for `mktime'. */
332 extern time_t timelocal (struct tm *__tp) __THROW;
334 /* Return the number of days in YEAR. */
335 extern int dysize (int __year) __THROW __attribute__ ((__const__));
339 # ifdef __USE_POSIX199309
340 /* Pause execution for a number of nanoseconds.
342 This function is a cancellation point and therefore not marked with
344 extern int nanosleep (__const struct timespec *__requested_time,
345 struct timespec *__remaining);
348 /* Get resolution of clock CLOCK_ID. */
349 extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW;
351 /* Get current value of clock CLOCK_ID and store it in TP. */
352 extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
354 /* Set clock CLOCK_ID to value TP. */
355 extern int clock_settime (clockid_t __clock_id, __const struct timespec *__tp)
358 # ifdef __USE_XOPEN2K
359 /* High-resolution sleep with the specified clock.
361 This function is a cancellation point and therefore not marked with
363 extern int clock_nanosleep (clockid_t __clock_id, int __flags,
364 __const struct timespec *__req,
365 struct timespec *__rem);
367 /* Return clock ID for CPU-time clock. */
368 extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW;
372 /* Create new per-process timer using CLOCK_ID. */
373 extern int timer_create (clockid_t __clock_id,
374 struct sigevent *__restrict __evp,
375 timer_t *__restrict __timerid) __THROW;
377 /* Delete timer TIMERID. */
378 extern int timer_delete (timer_t __timerid) __THROW;
380 /* Set timer TIMERID to VALUE, returning old value in OVLAUE. */
381 extern int timer_settime (timer_t __timerid, int __flags,
382 __const struct itimerspec *__restrict __value,
383 struct itimerspec *__restrict __ovalue) __THROW;
385 /* Get current value of timer TIMERID and store it in VLAUE. */
386 extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
389 /* Get expiration overrun for timer TIMERID. */
390 extern int timer_getoverrun (timer_t __timerid) __THROW;
394 # ifdef __USE_XOPEN_EXTENDED
395 /* Set to one of the following values to indicate an error.
396 1 the DATEMSK environment variable is null or undefined,
397 2 the template file cannot be opened for reading,
398 3 failed to get file status information,
399 4 the template file is not a regular file,
400 5 an error is encountered while reading the template file,
401 6 memory allication failed (not enough memory available),
402 7 there is no line in the template that matches the input,
403 8 invalid input specification Example: February 31 or a time is
404 specified that can not be represented in a time_t (representing
405 the time in seconds since 00:00:00 UTC, January 1, 1970) */
406 extern int getdate_err;
408 /* Parse the given string as a date specification and return a value
409 representing the value. The templates from the file identified by
410 the environment variable DATEMSK are used. In case of an error
411 `getdate_err' is set.
413 This function is a possible cancellation points and therefore not
414 marked with __THROW. */
415 extern struct tm *getdate (__const char *__string);
419 /* Since `getdate' is not reentrant because of the use of `getdate_err'
420 and the static buffer to return the result in, we provide a thread-safe
421 variant. The functionality is the same. The result is returned in
422 the buffer pointed to by RESBUFP and in case of an error the return
423 value is != 0 with the same values as given above for `getdate_err'.
425 This function is not part of POSIX and therefore no official
426 cancellation point. But due to similarity with an POSIX interface
427 or due to the implementation it is a cancellation point and
428 therefore not marked with __THROW. */
429 extern int getdate_r (__const char *__restrict __string,
430 struct tm *__restrict __resbufp);
435 #endif /* <time.h> included. */
437 #endif /* <time.h> not already included. */