1/* Copyright (C) 1991-2020 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/* Return the current time and put it in *TIMER if TIMER is not NULL. */ 
75extern time_t time (time_t *__timer) __THROW; 
76 
77/* Return the difference between TIME1 and TIME0. */ 
78extern double difftime (time_t __time1, time_t __time0) 
79 __THROW __attribute__ ((__const__)); 
80 
81/* Return the `time_t' representation of TP and normalize TP. */ 
82extern time_t mktime (struct tm *__tp) __THROW; 
83 
84 
85/* Format TP into S according to FORMAT. 
86 Write no more than MAXSIZE characters and return the number 
87 of characters written, or 0 if it would exceed MAXSIZE. */ 
88extern size_t strftime (char *__restrict __s, size_t __maxsize, 
89 const char *__restrict __format, 
90 const struct tm *__restrict __tp) __THROW; 
91 
92#ifdef __USE_XOPEN 
93/* Parse S according to FORMAT and store binary time information in TP. 
94 The return value is a pointer to the first unparsed character in S. */ 
95extern char *strptime (const char *__restrict __s, 
96 const char *__restrict __fmt, struct tm *__tp) 
97 __THROW; 
98#endif 
99 
100#ifdef __USE_XOPEN2K8 
101/* Similar to the two functions above but take the information from 
102 the provided locale and not the global locale. */ 
103 
104extern size_t strftime_l (char *__restrict __s, size_t __maxsize, 
105 const char *__restrict __format, 
106 const struct tm *__restrict __tp, 
107 locale_t __loc) __THROW; 
108#endif 
109 
110#ifdef __USE_GNU 
111extern char *strptime_l (const char *__restrict __s, 
112 const char *__restrict __fmt, struct tm *__tp, 
113 locale_t __loc) __THROW; 
114#endif 
115 
116 
117/* Return the `struct tm' representation of *TIMER 
118 in Universal Coordinated Time (aka Greenwich Mean Time). */ 
119extern struct tm *gmtime (const time_t *__timer) __THROW; 
120 
121/* Return the `struct tm' representation 
122 of *TIMER in the local timezone. */ 
123extern struct tm *localtime (const time_t *__timer) __THROW; 
124 
125#if defined __USE_POSIX || __GLIBC_USE (ISOC2X) 
126/* Return the `struct tm' representation of *TIMER in UTC, 
127 using *TP to store the result. */ 
128extern struct tm *gmtime_r (const time_t *__restrict __timer, 
129 struct tm *__restrict __tp) __THROW; 
130 
131/* Return the `struct tm' representation of *TIMER in local time, 
132 using *TP to store the result. */ 
133extern struct tm *localtime_r (const time_t *__restrict __timer, 
134 struct tm *__restrict __tp) __THROW; 
135#endif /* POSIX || C2X */ 
136 
137/* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n" 
138 that is the representation of TP in this format. */ 
139extern char *asctime (const struct tm *__tp) __THROW; 
140 
141/* Equivalent to `asctime (localtime (timer))'. */ 
142extern char *ctime (const time_t *__timer) __THROW; 
143 
144#if defined __USE_POSIX || __GLIBC_USE (ISOC2X) 
145/* Reentrant versions of the above functions. */ 
146 
147/* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n" 
148 that is the representation of TP in this format. */ 
149extern char *asctime_r (const struct tm *__restrict __tp, 
150 char *__restrict __buf) __THROW; 
151 
152/* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'. */ 
153extern char *ctime_r (const time_t *__restrict __timer, 
154 char *__restrict __buf) __THROW; 
155#endif /* POSIX || C2X */ 
156 
157 
158/* Defined in localtime.c. */ 
159extern char *__tzname[2]; /* Current timezone names. */ 
160extern int __daylight; /* If daylight-saving time is ever in use. */ 
161extern long int __timezone; /* Seconds west of UTC. */ 
162 
163 
164#ifdef __USE_POSIX 
165/* Same as above. */ 
166extern char *tzname[2]; 
167 
168/* Set time conversion information from the TZ environment variable. 
169 If TZ is not defined, a locale-dependent default is used. */ 
170extern void tzset (void) __THROW; 
171#endif 
172 
173#if defined __USE_MISC || defined __USE_XOPEN 
174extern int daylight; 
175extern long int timezone; 
176#endif 
177 
178 
179/* Nonzero if YEAR is a leap year (every 4 years, 
180 except every 100th isn't, and every 400th is). */ 
181#define __isleap(year) \ 
182 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) 
183 
184 
185#ifdef __USE_MISC 
186/* Miscellaneous functions many Unices inherited from the public domain 
187 localtime package. These are included only for compatibility. */ 
188 
189/* Like `mktime', but for TP represents Universal Time, not local time. */ 
190extern time_t timegm (struct tm *__tp) __THROW; 
191 
192/* Another name for `mktime'. */ 
193extern time_t timelocal (struct tm *__tp) __THROW; 
194 
195/* Return the number of days in YEAR. */ 
196extern int dysize (int __year) __THROW __attribute__ ((__const__)); 
197#endif 
198 
199 
200#ifdef __USE_POSIX199309 
201/* Pause execution for a number of nanoseconds. 
202 
203 This function is a cancellation point and therefore not marked with 
204 __THROW. */ 
205extern int nanosleep (const struct timespec *__requested_time, 
206 struct timespec *__remaining); 
207 
208 
209/* Get resolution of clock CLOCK_ID. */ 
210extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW; 
211 
212/* Get current value of clock CLOCK_ID and store it in TP. */ 
213extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW; 
214 
215/* Set clock CLOCK_ID to value TP. */ 
216extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp) 
217 __THROW; 
218 
219# ifdef __USE_XOPEN2K 
220/* High-resolution sleep with the specified clock. 
221 
222 This function is a cancellation point and therefore not marked with 
223 __THROW. */ 
224extern int clock_nanosleep (clockid_t __clock_id, int __flags, 
225 const struct timespec *__req, 
226 struct timespec *__rem); 
227 
228/* Return clock ID for CPU-time clock. */ 
229extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW; 
230# endif 
231 
232 
233/* Create new per-process timer using CLOCK_ID. */ 
234extern int timer_create (clockid_t __clock_id, 
235 struct sigevent *__restrict __evp, 
236 timer_t *__restrict __timerid) __THROW; 
237 
238/* Delete timer TIMERID. */ 
239extern int timer_delete (timer_t __timerid) __THROW; 
240 
241/* Set timer TIMERID to VALUE, returning old value in OVALUE. */ 
242extern int timer_settime (timer_t __timerid, int __flags, 
243 const struct itimerspec *__restrict __value, 
244 struct itimerspec *__restrict __ovalue) __THROW; 
245 
246/* Get current value of timer TIMERID and store it in VALUE. */ 
247extern int timer_gettime (timer_t __timerid, struct itimerspec *__value) 
248 __THROW; 
249 
250/* Get expiration overrun for timer TIMERID. */ 
251extern int timer_getoverrun (timer_t __timerid) __THROW; 
252#endif 
253 
254 
255#ifdef __USE_ISOC11 
256/* Set TS to calendar time based in time base BASE. */ 
257extern int timespec_get (struct timespec *__ts, int __base) 
258 __THROW __nonnull ((1)); 
259#endif 
260 
261 
262#ifdef __USE_XOPEN_EXTENDED 
263/* Set to one of the following values to indicate an error. 
264 1 the DATEMSK environment variable is null or undefined, 
265 2 the template file cannot be opened for reading, 
266 3 failed to get file status information, 
267 4 the template file is not a regular file, 
268 5 an error is encountered while reading the template file, 
269 6 memory allication failed (not enough memory available), 
270 7 there is no line in the template that matches the input, 
271 8 invalid input specification Example: February 31 or a time is 
272 specified that can not be represented in a time_t (representing 
273 the time in seconds since 00:00:00 UTC, January 1, 1970) */ 
274extern int getdate_err; 
275 
276/* Parse the given string as a date specification and return a value 
277 representing the value. The templates from the file identified by 
278 the environment variable DATEMSK are used. In case of an error 
279 `getdate_err' is set. 
280 
281 This function is a possible cancellation point and therefore not 
282 marked with __THROW. */ 
283extern struct tm *getdate (const char *__string); 
284#endif 
285 
286#ifdef __USE_GNU 
287/* Since `getdate' is not reentrant because of the use of `getdate_err' 
288 and the static buffer to return the result in, we provide a thread-safe 
289 variant. The functionality is the same. The result is returned in 
290 the buffer pointed to by RESBUFP and in case of an error the return 
291 value is != 0 with the same values as given above for `getdate_err'. 
292 
293 This function is not part of POSIX and therefore no official 
294 cancellation point. But due to similarity with an POSIX interface 
295 or due to the implementation it is a cancellation point and 
296 therefore not marked with __THROW. */ 
297extern int getdate_r (const char *__restrict __string, 
298 struct tm *__restrict __resbufp); 
299#endif 
300 
301__END_DECLS 
302 
303#endif /* time.h. */ 
304