1/* Copyright (C) 1991-2022 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 <https://www.gnu.org/licenses/>. */ 
17 
18/* 
19 * ISO C99 Standard: 7.23 Date and time <time.h> 
20 */ 
21 
22#ifndef _TIME_H 
23#define _TIME_H 1 
24 
25#include <features.h> 
26 
27#define __need_size_t 
28#define __need_NULL 
29#include <stddef.h> 
30 
31/* This defines CLOCKS_PER_SEC, which is the number of processor clock 
32 ticks per second, and possibly a number of other constants. */ 
33#include <bits/time.h> 
34 
35/* Many of the typedefs and structs whose official home is this header 
36 may also need to be defined by other headers. */ 
37#include <bits/types/clock_t.h> 
38#include <bits/types/time_t.h> 
39#include <bits/types/struct_tm.h> 
40 
41#if defined __USE_POSIX199309 || defined __USE_ISOC11 
42# include <bits/types/struct_timespec.h> 
43#endif 
44 
45#ifdef __USE_POSIX199309 
46# include <bits/types/clockid_t.h> 
47# include <bits/types/timer_t.h> 
48# include <bits/types/struct_itimerspec.h> 
49struct sigevent; 
50#endif 
51 
52#ifdef __USE_XOPEN2K 
53# ifndef __pid_t_defined 
54typedef __pid_t pid_t; 
55# define __pid_t_defined 
56# endif 
57#endif 
58 
59#ifdef __USE_XOPEN2K8 
60# include <bits/types/locale_t.h> 
61#endif 
62 
63#ifdef __USE_ISOC11 
64/* Time base values for timespec_get. */ 
65# define TIME_UTC 1 
66#endif 
67 
68__BEGIN_DECLS 
69 
70/* Time used by the program so far (user time + system time). 
71 The result / CLOCKS_PER_SEC is program time in seconds. */ 
72extern clock_t clock (void) __THROW; 
73 
74#ifndef __USE_TIME_BITS64 
75/* Return the current time and put it in *TIMER if TIMER is not NULL. */ 
76extern time_t time (time_t *__timer) __THROW; 
77 
78/* Return the difference between TIME1 and TIME0. */ 
79extern double difftime (time_t __time1, time_t __time0) 
80 __THROW __attribute__ ((__const__)); 
81 
82/* Return the `time_t' representation of TP and normalize TP. */ 
83extern time_t mktime (struct tm *__tp) __THROW; 
84#else 
85# ifdef __REDIRECT_NTH 
86extern time_t __REDIRECT_NTH (time, (time_t *__timer), __time64); 
87extern double __REDIRECT_NTH (difftime, (time_t __time1, time_t __time0), 
88 __difftime64) __attribute__ ((__const__)); 
89extern time_t __REDIRECT_NTH (mktime, (struct tm *__tp), __mktime64); 
90# else 
91# define time __time64 
92# define difftime __difftime64 
93# define mktime __mktime64 
94# endif 
95#endif 
96 
97/* Format TP into S according to FORMAT. 
98 Write no more than MAXSIZE characters and return the number 
99 of characters written, or 0 if it would exceed MAXSIZE. */ 
100extern size_t strftime (char *__restrict __s, size_t __maxsize, 
101 const char *__restrict __format, 
102 const struct tm *__restrict __tp) __THROW; 
103 
104#ifdef __USE_XOPEN 
105/* Parse S according to FORMAT and store binary time information in TP. 
106 The return value is a pointer to the first unparsed character in S. */ 
107extern char *strptime (const char *__restrict __s, 
108 const char *__restrict __fmt, struct tm *__tp) 
109 __THROW; 
110#endif 
111 
112#ifdef __USE_XOPEN2K8 
113/* Similar to the two functions above but take the information from 
114 the provided locale and not the global locale. */ 
115 
116extern size_t strftime_l (char *__restrict __s, size_t __maxsize, 
117 const char *__restrict __format, 
118 const struct tm *__restrict __tp, 
119 locale_t __loc) __THROW; 
120#endif 
121 
122#ifdef __USE_GNU 
123extern char *strptime_l (const char *__restrict __s, 
124 const char *__restrict __fmt, struct tm *__tp, 
125 locale_t __loc) __THROW; 
126#endif 
127 
128 
129#ifndef __USE_TIME_BITS64 
130/* Return the `struct tm' representation of *TIMER 
131 in Universal Coordinated Time (aka Greenwich Mean Time). */ 
132extern struct tm *gmtime (const time_t *__timer) __THROW; 
133 
134/* Return the `struct tm' representation 
135 of *TIMER in the local timezone. */ 
136extern struct tm *localtime (const time_t *__timer) __THROW; 
137 
138#else 
139# ifdef __REDIRECT_NTH 
140extern struct tm*__REDIRECT_NTH (gmtime, (const time_t *__timer), __gmtime64); 
141extern struct tm *__REDIRECT_NTH (localtime, (const time_t *__timer), 
142 __localtime64); 
143# else 
144# define gmtime __gmtime64 
145# define localtime __localtime64 
146# endif 
147#endif 
148 
149 
150#if defined __USE_POSIX || __GLIBC_USE (ISOC2X) 
151# ifndef __USE_TIME_BITS64 
152/* Return the `struct tm' representation of *TIMER in UTC, 
153 using *TP to store the result. */ 
154extern struct tm *gmtime_r (const time_t *__restrict __timer, 
155 struct tm *__restrict __tp) __THROW; 
156 
157/* Return the `struct tm' representation of *TIMER in local time, 
158 using *TP to store the result. */ 
159extern struct tm *localtime_r (const time_t *__restrict __timer, 
160 struct tm *__restrict __tp) __THROW; 
161# else 
162# ifdef __REDIRECT_NTH 
163extern struct tm*__REDIRECT_NTH (gmtime_r, (const time_t *__restrict __timer, 
164 struct tm *__restrict __tp), 
165 __gmtime64_r); 
166 
167extern struct tm*__REDIRECT_NTH (localtime_r, (const time_t *__restrict __t, 
168 struct tm *__restrict __tp), 
169 __localtime64_r); 
170# else 
171# define gmtime_r __gmtime64_r 
172# define localtime_r __localtime_r 
173# endif 
174# endif 
175#endif /* POSIX || C2X */ 
176 
177/* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n" 
178 that is the representation of TP in this format. */ 
179extern char *asctime (const struct tm *__tp) __THROW; 
180 
181/* Equivalent to `asctime (localtime (timer))'. */ 
182#ifndef __USE_TIME_BITS64 
183extern char *ctime (const time_t *__timer) __THROW; 
184#else 
185# ifdef __REDIRECT_NTH 
186extern char *__REDIRECT_NTH (ctime, (const time_t *__timer), __ctime64); 
187# else 
188# define ctime __ctime64 
189# endif 
190#endif 
191 
192#ifdef __USE_POSIX 
193/* Reentrant versions of the above functions. */ 
194 
195/* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n" 
196 that is the representation of TP in this format. */ 
197extern char *asctime_r (const struct tm *__restrict __tp, 
198 char *__restrict __buf) __THROW; 
199 
200/* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'. */ 
201#ifndef __USE_TIME_BITS64 
202extern char *ctime_r (const time_t *__restrict __timer, 
203 char *__restrict __buf) __THROW; 
204#else 
205# ifdef __REDIRECT_NTH 
206extern char *__REDIRECT_NTH (ctime_r, (const time_t *__restrict __timer, 
207 char *__restrict __buf), __ctime64_r); 
208# else 
209# define ctime_r __ctime64_r 
210# endif 
211#endif 
212 
213#endif /* POSIX */ 
214 
215 
216/* Defined in localtime.c. */ 
217extern char *__tzname[2]; /* Current timezone names. */ 
218extern int __daylight; /* If daylight-saving time is ever in use. */ 
219extern long int __timezone; /* Seconds west of UTC. */ 
220 
221 
222#ifdef __USE_POSIX 
223/* Same as above. */ 
224extern char *tzname[2]; 
225 
226/* Set time conversion information from the TZ environment variable. 
227 If TZ is not defined, a locale-dependent default is used. */ 
228extern void tzset (void) __THROW; 
229#endif 
230 
231#if defined __USE_MISC || defined __USE_XOPEN 
232extern int daylight; 
233extern long int timezone; 
234#endif 
235 
236 
237/* Nonzero if YEAR is a leap year (every 4 years, 
238 except every 100th isn't, and every 400th is). */ 
239#define __isleap(year) \ 
240 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) 
241 
242 
243#ifdef __USE_MISC 
244/* Miscellaneous functions many Unices inherited from the public domain 
245 localtime package. These are included only for compatibility. */ 
246 
247#ifndef __USE_TIME_BITS64 
248/* Like `mktime', but for TP represents Universal Time, not local time. */ 
249extern time_t timegm (struct tm *__tp) __THROW; 
250/* Another name for `mktime'. */ 
251extern time_t timelocal (struct tm *__tp) __THROW; 
252#else 
253# ifdef __REDIRECT_NTH 
254extern time_t __REDIRECT_NTH (timegm, (struct tm *__tp), __timegm64); 
255extern time_t __REDIRECT_NTH (timelocal, (struct tm *__tp), __mktime64); 
256# else 
257# define timegm __timegm64 
258# endif 
259#endif 
260 
261/* Return the number of days in YEAR. */ 
262extern int dysize (int __year) __THROW __attribute__ ((__const__)); 
263#endif 
264 
265 
266#ifdef __USE_POSIX199309 
267# ifndef __USE_TIME_BITS64 
268/* Pause execution for a number of nanoseconds. 
269 
270 This function is a cancellation point and therefore not marked with 
271 __THROW. */ 
272extern int nanosleep (const struct timespec *__requested_time, 
273 struct timespec *__remaining); 
274 
275/* Get resolution of clock CLOCK_ID. */ 
276extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW; 
277 
278/* Get current value of clock CLOCK_ID and store it in TP. */ 
279extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW; 
280 
281/* Set clock CLOCK_ID to value TP. */ 
282extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp) 
283 __THROW; 
284# else 
285# ifdef __REDIRECT 
286extern int __REDIRECT (nanosleep, (const struct timespec *__requested_time, 
287 struct timespec *__remaining), 
288 __nanosleep64); 
289extern int __REDIRECT_NTH (clock_getres, (clockid_t __clock_id, 
290 struct timespec *__res), 
291 __clock_getres64); 
292extern int __REDIRECT_NTH (clock_gettime, (clockid_t __clock_id, struct 
293 timespec *__tp), __clock_gettime64); 
294extern int __REDIRECT_NTH (clock_settime, (clockid_t __clock_id, const struct 
295 timespec *__tp), __clock_settime64); 
296# else 
297# define nanosleep __nanosleep64 
298# define clock_getres __clock_getres64 
299# define clock_gettime __clock_gettime64 
300# define clock_settime __clock_settime64 
301# endif 
302# endif 
303 
304 
305# ifdef __USE_XOPEN2K 
306/* High-resolution sleep with the specified clock. 
307 
308 This function is a cancellation point and therefore not marked with 
309 __THROW. */ 
310# ifndef __USE_TIME_BITS64 
311extern int clock_nanosleep (clockid_t __clock_id, int __flags, 
312 const struct timespec *__req, 
313 struct timespec *__rem); 
314# else 
315# ifdef __REDIRECT 
316extern int __REDIRECT (clock_nanosleep, (clockid_t __clock_id, int __flags, 
317 const struct timespec *__req, 
318 struct timespec *__rem), 
319 __clock_nanosleep_time64); 
320# else 
321# define clock_nanosleep __clock_nanosleep_time64 
322# endif 
323# endif 
324 
325/* Return clock ID for CPU-time clock. */ 
326extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW; 
327# endif 
328 
329 
330/* Create new per-process timer using CLOCK_ID. */ 
331extern int timer_create (clockid_t __clock_id, 
332 struct sigevent *__restrict __evp, 
333 timer_t *__restrict __timerid) __THROW; 
334 
335/* Delete timer TIMERID. */ 
336extern int timer_delete (timer_t __timerid) __THROW; 
337 
338/* Set timer TIMERID to VALUE, returning old value in OVALUE. */ 
339# ifndef __USE_TIME_BITS64 
340extern int timer_settime (timer_t __timerid, int __flags, 
341 const struct itimerspec *__restrict __value, 
342 struct itimerspec *__restrict __ovalue) __THROW; 
343 
344/* Get current value of timer TIMERID and store it in VALUE. */ 
345extern int timer_gettime (timer_t __timerid, struct itimerspec *__value) 
346 __THROW; 
347# else 
348# ifdef __REDIRECT_NTH 
349extern int __REDIRECT_NTH (timer_settime, (timer_t __timerid, int __flags, 
350 const struct itimerspec *__restrict __value, 
351 struct itimerspec *__restrict __ovalue), 
352 __timer_settime64); 
353 
354extern int __REDIRECT_NTH (timer_gettime, (timer_t __timerid, 
355 struct itimerspec *__value), 
356 __timer_gettime64); 
357# else 
358# define timer_settime __timer_settime64 
359# define timer_gettime __timer_gettime64 
360# endif 
361# endif 
362 
363/* Get expiration overrun for timer TIMERID. */ 
364extern int timer_getoverrun (timer_t __timerid) __THROW; 
365#endif 
366 
367 
368#ifdef __USE_ISOC11 
369# ifndef __USE_TIME_BITS64 
370/* Set TS to calendar time based in time base BASE. */ 
371extern int timespec_get (struct timespec *__ts, int __base) 
372 __THROW __nonnull ((1)); 
373# else 
374# ifdef __REDIRECT_NTH 
375extern int __REDIRECT_NTH (timespec_get, (struct timespec *__ts, int __base), 
376 __timespec_get64) __nonnull ((1)); 
377# else 
378# define timespec_get __timespec_get64 
379# endif 
380# endif 
381#endif 
382 
383 
384#if __GLIBC_USE (ISOC2X) 
385# ifndef __USE_TIME_BITS64 
386/* Set TS to resolution of time base BASE. */ 
387extern int timespec_getres (struct timespec *__ts, int __base) 
388 __THROW; 
389# else 
390# ifdef __REDIRECT_NTH 
391extern int __REDIRECT_NTH (timespec_getres, (struct timespec *__ts, 
392 int __base), 
393 __timespec_getres64); 
394# else 
395# define timespec_getres __timespec_getres64 
396# endif 
397# endif 
398#endif 
399 
400 
401#ifdef __USE_XOPEN_EXTENDED 
402/* Set to one of the following values to indicate an error. 
403 1 the DATEMSK environment variable is null or undefined, 
404 2 the template file cannot be opened for reading, 
405 3 failed to get file status information, 
406 4 the template file is not a regular file, 
407 5 an error is encountered while reading the template file, 
408 6 memory allication failed (not enough memory available), 
409 7 there is no line in the template that matches the input, 
410 8 invalid input specification Example: February 31 or a time is 
411 specified that can not be represented in a time_t (representing 
412 the time in seconds since 00:00:00 UTC, January 1, 1970) */ 
413extern int getdate_err; 
414 
415/* Parse the given string as a date specification and return a value 
416 representing the value. The templates from the file identified by 
417 the environment variable DATEMSK are used. In case of an error 
418 `getdate_err' is set. 
419 
420 This function is a possible cancellation point and therefore not 
421 marked with __THROW. */ 
422extern struct tm *getdate (const char *__string); 
423#endif 
424 
425#ifdef __USE_GNU 
426/* Since `getdate' is not reentrant because of the use of `getdate_err' 
427 and the static buffer to return the result in, we provide a thread-safe 
428 variant. The functionality is the same. The result is returned in 
429 the buffer pointed to by RESBUFP and in case of an error the return 
430 value is != 0 with the same values as given above for `getdate_err'. 
431 
432 This function is not part of POSIX and therefore no official 
433 cancellation point. But due to similarity with an POSIX interface 
434 or due to the implementation it is a cancellation point and 
435 therefore not marked with __THROW. */ 
436extern int getdate_r (const char *__restrict __string, 
437 struct tm *__restrict __resbufp); 
438#endif 
439 
440__END_DECLS 
441 
442#endif /* time.h. */ 
443