1 /* Copyright (C) 1991-1999, 2000, 2001 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>
58 /* Returned by `clock'. */
59 typedef __clock_t clock_t;
61 #endif /* clock_t not defined and <time.h> or need clock_t. */
64 #if !defined __time_t_defined && (defined _TIME_H || defined __need_time_t)
65 # define __time_t_defined 1
67 # include <bits/types.h>
69 /* Returned by `time'. */
70 typedef __time_t time_t;
72 #endif /* time_t not defined and <time.h> or need time_t. */
75 #if !defined __clockid_t_defined && \
76 ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_clockid_t)
77 # define __clockid_t_defined 1
79 # include <bits/types.h>
81 /* Clock ID used in clock and timer functions. */
82 typedef __clockid_t clockid_t;
84 #endif /* clockid_t not defined and <time.h> or need clockid_t. */
85 #undef __clockid_time_t
87 #if !defined __timer_t_defined && \
88 ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_timer_t)
89 # define __timer_t_defined 1
91 # include <bits/types.h>
93 /* Timer ID returned by `timer_create'. */
94 typedef __timer_t timer_t;
96 #endif /* timer_t not defined and <time.h> or need timer_t. */
100 #if !defined __timespec_defined && \
101 ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_timespec)
102 # define __timespec_defined 1
104 /* POSIX.1b structure for a time value. This is like a `struct timeval' but
105 has nanoseconds instead of microseconds. */
108 long int tv_sec; /* Seconds. */
109 long int tv_nsec; /* Nanoseconds. */
112 #endif /* timespec not defined and <time.h> or need timespec. */
113 #undef __need_timespec
117 /* Used by other time functions. */
120 int tm_sec; /* Seconds. [0-60] (1 leap second) */
121 int tm_min; /* Minutes. [0-59] */
122 int tm_hour; /* Hours. [0-23] */
123 int tm_mday; /* Day. [1-31] */
124 int tm_mon; /* Month. [0-11] */
125 int tm_year; /* Year - 1900. */
126 int tm_wday; /* Day of week. [0-6] */
127 int tm_yday; /* Days in year.[0-365] */
128 int tm_isdst; /* DST. [-1/0/1]*/
130 #ifdef __UCLIBC_HAS_TM_EXTENSIONS__
132 long int tm_gmtoff; /* Seconds east of UTC. */
133 __const char tm_zone[8]; /* Timezone abbreviation. */
135 long int __tm_gmtoff; /* Seconds east of UTC. */
136 __const char __tm_zone[8];/* Timezone abbreviation. */
138 #endif /* __UCLIBC_HAS_TM_EXTENSIONS__ */
142 #ifdef __USE_POSIX199309
143 /* POSIX.1b structure for timer start values and intervals. */
146 struct timespec it_interval;
147 struct timespec it_value;
150 /* We can use a simple forward declaration. */
153 #endif /* POSIX.1b */
156 # ifndef __pid_t_defined
157 typedef __pid_t pid_t;
158 # define __pid_t_defined
163 /* Time used by the program so far (user time + system time).
164 The result / CLOCKS_PER_SECOND is program time in seconds. */
165 extern clock_t clock (void) __THROW;
167 /* Return the current time and put it in *TIMER if TIMER is not NULL. */
168 extern time_t time (time_t *__timer) __THROW;
170 /* Return the difference between TIME1 and TIME0. */
171 extern double difftime (time_t __time1, time_t __time0)
172 __THROW __attribute__ ((__const__));
174 /* Return the `time_t' representation of TP and normalize TP. */
175 extern time_t mktime (struct tm *__tp) __THROW;
178 /* Format TP into S according to FORMAT.
179 Write no more than MAXSIZE characters and return the number
180 of characters written, or 0 if it would exceed MAXSIZE. */
181 extern size_t strftime (char *__restrict __s, size_t __maxsize,
182 __const char *__restrict __format,
183 __const struct tm *__restrict __tp) __THROW;
186 /* Parse S according to FORMAT and store binary time information in TP.
187 The return value is a pointer to the first unparsed character in S. */
188 extern char *strptime (__const char *__restrict __s,
189 __const char *__restrict __fmt, struct tm *__tp)
194 /* Return the `struct tm' representation of *TIMER
195 in Universal Coordinated Time (aka Greenwich Mean Time). */
196 extern struct tm *gmtime (__const time_t *__timer) __THROW;
198 /* Return the `struct tm' representation
199 of *TIMER in the local timezone. */
200 extern struct tm *localtime (__const time_t *__timer) __THROW;
202 # if defined __USE_POSIX || defined __USE_MISC
203 /* Return the `struct tm' representation of *TIMER in UTC,
204 using *TP to store the result. */
205 extern struct tm *gmtime_r (__const time_t *__restrict __timer,
206 struct tm *__restrict __tp) __THROW;
208 /* Return the `struct tm' representation of *TIMER in local time,
209 using *TP to store the result. */
210 extern struct tm *localtime_r (__const time_t *__restrict __timer,
211 struct tm *__restrict __tp) __THROW;
212 # endif /* POSIX or misc */
214 /* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n"
215 that is the representation of TP in this format. */
216 extern char *asctime (__const struct tm *__tp) __THROW;
218 /* Equivalent to `asctime (localtime (timer))'. */
219 extern char *ctime (__const time_t *__timer) __THROW;
221 # if defined __USE_POSIX || defined __USE_MISC
222 /* Reentrant versions of the above functions. */
224 /* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n"
225 that is the representation of TP in this format. */
226 extern char *asctime_r (__const struct tm *__restrict __tp,
227 char *__restrict __buf) __THROW;
229 /* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'. */
230 extern char *ctime_r (__const time_t *__restrict __timer,
231 char *__restrict __buf) __THROW;
232 # endif /* POSIX or misc */
235 /* Defined in localtime.c. */
236 extern char *__tzname[2]; /* Current timezone names. */
237 extern int __daylight; /* If daylight-saving time is ever in use. */
238 extern long int __timezone; /* Seconds west of UTC. */
243 extern char *tzname[2];
245 /* Set time conversion information from the TZ environment variable.
246 If TZ is not defined, a locale-dependent default is used. */
247 extern void tzset (void) __THROW;
250 # if defined __USE_SVID || defined __USE_XOPEN
252 extern long int timezone;
256 /* Set the system time to *WHEN.
257 This call is restricted to the superuser. */
258 extern int stime (__const time_t *__when) __THROW;
262 /* Nonzero if YEAR is a leap year (every 4 years,
263 except every 100th isn't, and every 400th is). */
264 # define __isleap(year) \
265 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
269 /* Miscellaneous functions many Unices inherited from the public domain
270 localtime package. These are included only for compatibility. */
272 /* Like `mktime', but for TP represents Universal Time, not local time. */
273 extern time_t timegm (struct tm *__tp) __THROW;
275 /* Another name for `mktime'. */
276 extern time_t timelocal (struct tm *__tp) __THROW;
278 /* Return the number of days in YEAR. */
279 extern int dysize (int __year) __THROW __attribute__ ((__const__));
283 # ifdef __USE_POSIX199309
284 /* Pause execution for a number of nanoseconds. */
285 extern int nanosleep (__const struct timespec *__requested_time,
286 struct timespec *__remaining) __THROW;
289 /* Get resolution of clock CLOCK_ID. */
290 extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW;
292 /* Get current value of clock CLOCK_ID and store it in TP. */
293 extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
295 /* Set clock CLOCK_ID to value TP. */
296 extern int clock_settime (clockid_t __clock_id, __const struct timespec *__tp)
299 # ifdef __USE_XOPEN2K
300 /* High-resolution sleep with the specified clock. */
301 extern int clock_nanosleep (clockid_t __clock_id, int __flags,
302 __const struct timespec *__req,
303 struct timespec *__rem) __THROW;
305 /* Return clock ID for CPU-time clock. */
306 extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW;
310 /* Create new per-process timer using CLOCK_ID. */
311 extern int timer_create (clockid_t __clock_id,
312 struct sigevent *__restrict __evp,
313 timer_t *__restrict __timerid) __THROW;
315 /* Delete timer TIMERID. */
316 extern int timer_delete (timer_t __timerid) __THROW;
318 /* Set timer TIMERID to VALUE, returning old value in OVLAUE. */
319 extern int timer_settime (timer_t __timerid, int __flags,
320 __const struct itimerspec *__restrict __value,
321 struct itimerspec *__restrict __ovalue) __THROW;
323 /* Get current value of timer TIMERID and store it in VLAUE. */
324 extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
327 /* Get expiration overrun for timer TIMERID. */
328 extern int timer_getoverrun (timer_t __timerid) __THROW;
332 # ifdef __USE_XOPEN_EXTENDED
333 /* Set to one of the following values to indicate an error.
334 1 the DATEMSK environment variable is null or undefined,
335 2 the template file cannot be opened for reading,
336 3 failed to get file status information,
337 4 the template file is not a regular file,
338 5 an error is encountered while reading the template file,
339 6 memory allication failed (not enough memory available),
340 7 there is no line in the template that matches the input,
341 8 invalid input specification Example: February 31 or a time is
342 specified that can not be represented in a time_t (representing
343 the time in seconds since 00:00:00 UTC, January 1, 1970) */
344 extern int getdate_err;
346 /* Parse the given string as a date specification and return a value
347 representing the value. The templates from the file identified by
348 the environment variable DATEMSK are used. In case of an error
349 `getdate_err' is set. */
350 extern struct tm *getdate (__const char *__string) __THROW;
354 /* Since `getdate' is not reentrant because of the use of `getdate_err'
355 and the static buffer to return the result in, we provide a thread-safe
356 variant. The functionality is the same. The result is returned in
357 the buffer pointed to by RESBUFP and in case of an error the return
358 value is != 0 with the same values as given above for `getdate_err'. */
359 extern int getdate_r (__const char *__restrict __string,
360 struct tm *__restrict __resbufp) __THROW;
366 #endif /* <time.h> included. */
368 #endif /* <time.h> not already included. */