1 /* Copyright (C) 1991,92,93,94,95,96,97,98,99 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
20 * ISO C Standard: 4.12 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. */
47 # define CLK_TCK CLOCKS_PER_SEC
51 #endif /* <time.h> included. */
54 #if !defined __clock_t_defined && (defined _TIME_H || defined __need_clock_t)
55 # define __clock_t_defined 1
57 # include <bits/types.h>
59 /* Returned by `clock'. */
60 typedef __clock_t clock_t;
62 #endif /* clock_t not defined and <time.h> or need clock_t. */
65 #if !defined __time_t_defined && (defined _TIME_H || defined __need_time_t)
66 # define __time_t_defined 1
68 # include <bits/types.h>
70 /* Returned by `time'. */
71 typedef __time_t time_t;
73 #endif /* time_t not defined and <time.h> or need time_t. */
77 #if !defined __timespec_defined && \
78 ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_timespec)
79 # define __timespec_defined 1
81 /* POSIX.1b structure for a time value. This is like a `struct timeval' but
82 has nanoseconds instead of microseconds. */
85 long int tv_sec; /* Seconds. */
86 long int tv_nsec; /* Nanoseconds. */
89 #endif /* timespec not defined and <time.h> or need timespec. */
90 #undef __need_timespec
94 /* Used by other time functions. */
97 int tm_sec; /* Seconds. [0-60] (1 leap second) */
98 int tm_min; /* Minutes. [0-59] */
99 int tm_hour; /* Hours. [0-23] */
100 int tm_mday; /* Day. [1-31] */
101 int tm_mon; /* Month. [0-11] */
102 int tm_year; /* Year - 1900. */
103 int tm_wday; /* Day of week. [0-6] */
104 int tm_yday; /* Days in year.[0-365] */
105 int tm_isdst; /* DST. [-1/0/1]*/
108 long int tm_gmtoff; /* Seconds east of UTC. */
109 __const char *tm_zone; /* Timezone abbreviation. */
111 long int __tm_gmtoff; /* Seconds east of UTC. */
112 __const char *__tm_zone; /* Timezone abbreviation. */
117 #ifdef __USE_POSIX199309
118 /* Clock ID used in clock and timer functions. */
119 typedef __clockid_t clockid_t;
121 /* Timer ID returned by `timer_create'. */
122 typedef __timer_t timer_t;
124 /* POSIX.1b structure for timer start values and intervals. */
127 struct timespec it_interval;
128 struct timespec it_value;
131 /* We can use a simple forward declaration. */
134 #endif /* POSIX.1b */
137 /* Time used by the program so far (user time + system time).
138 The result / CLOCKS_PER_SECOND is program time in seconds. */
139 extern clock_t clock (void) __THROW;
141 /* Return the current time and put it in *TIMER if TIMER is not NULL. */
142 extern time_t time (time_t *__timer) __THROW;
144 /* Return the difference between TIME1 and TIME0. */
145 extern double difftime (time_t __time1, time_t __time0)
146 __THROW __attribute__ ((__const__));
148 /* Return the `time_t' representation of TP and normalize TP. */
149 extern time_t mktime (struct tm *__tp) __THROW;
152 /* Format TP into S according to FORMAT.
153 Write no more than MAXSIZE characters and return the number
154 of characters written, or 0 if it would exceed MAXSIZE. */
155 extern size_t strftime (char *__restrict __s, size_t __maxsize,
156 __const char *__restrict __format,
157 __const struct tm *__restrict __tp) __THROW;
160 /* Parse S according to FORMAT and store binary time information in TP.
161 The return value is a pointer to the first unparsed character in S. */
162 extern char *strptime (__const char *__s, __const char *__fmt, struct tm *__tp)
167 /* Return the `struct tm' representation of *TIMER
168 in Universal Coordinated Time (aka Greenwich Mean Time). */
169 extern struct tm *gmtime (__const time_t *__timer) __THROW;
171 /* Return the `struct tm' representation
172 of *TIMER in the local timezone. */
173 extern struct tm *localtime (__const time_t *__timer) __THROW;
175 # if defined __USE_POSIX || defined __USE_MISC
176 /* Return the `struct tm' representation of *TIMER in UTC,
177 using *TP to store the result. */
178 extern struct tm *gmtime_r (__const time_t *__restrict __timer,
179 struct tm *__restrict __tp) __THROW;
181 /* Return the `struct tm' representation of *TIMER in local time,
182 using *TP to store the result. */
183 extern struct tm *localtime_r (__const time_t *__restrict __timer,
184 struct tm *__restrict __tp) __THROW;
185 # endif /* POSIX or misc */
187 /* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n"
188 that is the representation of TP in this format. */
189 extern char *asctime (__const struct tm *__tp) __THROW;
191 /* Equivalent to `asctime (localtime (timer))'. */
192 extern char *ctime (__const time_t *__timer) __THROW;
194 # if defined __USE_POSIX || defined __USE_MISC
195 /* Reentrant versions of the above functions. */
197 /* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n"
198 that is the representation of TP in this format. */
199 extern char *asctime_r (__const struct tm *__restrict __tp,
200 char *__restrict __buf) __THROW;
202 /* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'. */
203 extern char *ctime_r (__const time_t *__restrict __timer,
204 char *__restrict __buf) __THROW;
205 # endif /* POSIX or misc */
208 /* Defined in localtime.c. */
209 extern char *__tzname[2]; /* Current timezone names. */
210 extern int __daylight; /* If daylight-saving time is ever in use. */
211 extern long int __timezone; /* Seconds west of UTC. */
216 extern char *tzname[2];
218 /* Set time conversion information from the TZ environment variable.
219 If TZ is not defined, a locale-dependent default is used. */
220 extern void tzset (void) __THROW;
223 # if defined __USE_SVID || defined __USE_XOPEN
225 extern long int timezone;
229 /* Set the system time to *WHEN.
230 This call is restricted to the superuser. */
231 extern int stime (__const time_t *__when) __THROW;
235 /* Nonzero if YEAR is a leap year (every 4 years,
236 except every 100th isn't, and every 400th is). */
237 # define __isleap(year) \
238 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
242 /* Miscellaneous functions many Unices inherited from the public domain
243 localtime package. These are included only for compatibility. */
245 /* Like `mktime', but for TP represents Universal Time, not local time. */
246 extern time_t timegm (struct tm *__tp) __THROW;
248 /* Another name for `mktime'. */
249 extern time_t timelocal (struct tm *__tp) __THROW;
251 /* Return the number of days in YEAR. */
252 extern int dysize (int __year) __THROW;
256 # ifdef __USE_POSIX199309
257 /* Pause execution for a number of nanoseconds. */
258 extern int nanosleep (__const struct timespec *__requested_time,
259 struct timespec *__remaining) __THROW;
262 /* Get resolution of clock CLOCK_ID. */
263 extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW;
265 /* Get current value of clock CLOCK_ID and store it in TP. */
266 extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
268 /* Set clock CLOCK_ID to value TP. */
269 extern int clock_settime (clockid_t __clock_id, __const struct timespec *__tp)
273 /* Create new per-process timer using CLOCK_ID. */
274 extern int timer_create (clockid_t __clock_id, struct sigevent *__evp,
275 timer_t *__timerid) __THROW;
277 /* Delete timer TIMERID. */
278 extern int timer_delete (timer_t __timerid) __THROW;
280 /* Set timer TIMERID to VALUE, returning old value in OVLAUE. */
281 extern int timer_settime (timer_t __timerid, int __flags,
282 __const struct itimerspec *__value,
283 struct itimerspec *__ovalue) __THROW;
285 /* Get current value of timer TIMERID and store it in VLAUE. */
286 extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
289 /* Get expiration overrun for timer TIMERID. */
290 extern int timer_getoverrun (timer_t __timerid) __THROW;
294 # ifdef __USE_XOPEN_EXTENDED
295 /* Set to one of the following values to indicate an error.
296 1 the DATEMSK environment variable is null or undefined,
297 2 the template file cannot be opened for reading,
298 3 failed to get file status information,
299 4 the template file is not a regular file,
300 5 an error is encountered while reading the template file,
301 6 memory allication failed (not enough memory available),
302 7 there is no line in the template that matches the input,
303 8 invalid input specification Example: February 31 or a time is
304 specified that can not be represented in a time_t (representing
305 the time in seconds since 00:00:00 UTC, January 1, 1970) */
306 extern int getdate_err;
308 /* Parse the given string as a date specification and return a value
309 representing the value. The templates from the file identified by
310 the environment variable DATEMSK are used. In case of an error
311 `getdate_err' is set. */
312 extern struct tm *getdate (__const char *__string) __THROW;
316 /* Since `getdate' is not reentrant because of the use of `getdate_err'
317 and the static buffer to return the result in, we provide a thread-safe
318 variant. The functionality is the same. The result is returned in
319 the buffer pointed to by RESBUFP and in case of an error the return
320 value is != 0 with the same values as given above for `getdate_err'. */
321 extern int getdate_r (__const char *__restrict __string,
322 struct tm *__restrict __resbufp) __THROW;
328 #endif /* <time.h> included. */
330 #endif /* <time.h> not already included. */