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/* Copyright (C) 1991-2022 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ /* * ISO C99 Standard: 7.23 Date and time <time.h> */ #ifndef _TIME_H #define _TIME_H 1 #include <features.h> #define __need_size_t #define __need_NULL #include <stddef.h> /* This defines CLOCKS_PER_SEC, which is the number of processor clock ticks per second, and possibly a number of other constants. */ #include <bits/time.h> /* Many of the typedefs and structs whose official home is this header may also need to be defined by other headers. */ #include <bits/types/clock_t.h> #include <bits/types/time_t.h> #include <bits/types/struct_tm.h> #if defined __USE_POSIX199309 || defined __USE_ISOC11 # include <bits/types/struct_timespec.h> #endif #ifdef __USE_POSIX199309 # include <bits/types/clockid_t.h> # include <bits/types/timer_t.h> # include <bits/types/struct_itimerspec.h> struct sigevent; #endif #ifdef __USE_XOPEN2K # ifndef __pid_t_defined typedef __pid_t pid_t; # define __pid_t_defined # endif #endif #ifdef __USE_XOPEN2K8 # include <bits/types/locale_t.h> #endif #ifdef __USE_ISOC11 /* Time base values for timespec_get. */ # define TIME_UTC 1 #endif __BEGIN_DECLS /* Time used by the program so far (user time + system time). The result / CLOCKS_PER_SEC is program time in seconds. */ extern clock_t clock (void) __THROW; #ifndef __USE_TIME_BITS64 /* Return the current time and put it in *TIMER if TIMER is not NULL. */ extern time_t time (time_t *__timer) __THROW; /* Return the difference between TIME1 and TIME0. */ extern double difftime (time_t __time1, time_t __time0) __THROW __attribute__ ((__const__)); /* Return the `time_t' representation of TP and normalize TP. */ extern time_t mktime (struct tm *__tp) __THROW; #else # ifdef __REDIRECT_NTH extern time_t __REDIRECT_NTH (time, (time_t *__timer), __time64); extern double __REDIRECT_NTH (difftime, (time_t __time1, time_t __time0), __difftime64) __attribute__ ((__const__)); extern time_t __REDIRECT_NTH (mktime, (struct tm *__tp), __mktime64); # else # define time __time64 # define difftime __difftime64 # define mktime __mktime64 # endif #endif /* Format TP into S according to FORMAT. Write no more than MAXSIZE characters and return the number of characters written, or 0 if it would exceed MAXSIZE. */ extern size_t strftime (char *__restrict __s, size_t __maxsize, const char *__restrict __format, const struct tm *__restrict __tp) __THROW; #ifdef __USE_XOPEN /* Parse S according to FORMAT and store binary time information in TP. The return value is a pointer to the first unparsed character in S. */ extern char *strptime (const char *__restrict __s, const char *__restrict __fmt, struct tm *__tp) __THROW; #endif #ifdef __USE_XOPEN2K8 /* Similar to the two functions above but take the information from the provided locale and not the global locale. */ extern size_t strftime_l (char *__restrict __s, size_t __maxsize, const char *__restrict __format, const struct tm *__restrict __tp, locale_t __loc) __THROW; #endif #ifdef __USE_GNU extern char *strptime_l (const char *__restrict __s, const char *__restrict __fmt, struct tm *__tp, locale_t __loc) __THROW; #endif #ifndef __USE_TIME_BITS64 /* Return the `struct tm' representation of *TIMER in Universal Coordinated Time (aka Greenwich Mean Time). */ extern struct tm *gmtime (const time_t *__timer) __THROW; /* Return the `struct tm' representation of *TIMER in the local timezone. */ extern struct tm *localtime (const time_t *__timer) __THROW; #else # ifdef __REDIRECT_NTH extern struct tm*__REDIRECT_NTH (gmtime, (const time_t *__timer), __gmtime64); extern struct tm *__REDIRECT_NTH (localtime, (const time_t *__timer), __localtime64); # else # define gmtime __gmtime64 # define localtime __localtime64 # endif #endif #if defined __USE_POSIX || __GLIBC_USE (ISOC2X) # ifndef __USE_TIME_BITS64 /* Return the `struct tm' representation of *TIMER in UTC, using *TP to store the result. */ extern struct tm *gmtime_r (const time_t *__restrict __timer, struct tm *__restrict __tp) __THROW; /* Return the `struct tm' representation of *TIMER in local time, using *TP to store the result. */ extern struct tm *localtime_r (const time_t *__restrict __timer, struct tm *__restrict __tp) __THROW; # else # ifdef __REDIRECT_NTH extern struct tm*__REDIRECT_NTH (gmtime_r, (const time_t *__restrict __timer, struct tm *__restrict __tp), __gmtime64_r); extern struct tm*__REDIRECT_NTH (localtime_r, (const time_t *__restrict __t, struct tm *__restrict __tp), __localtime64_r); # else # define gmtime_r __gmtime64_r # define localtime_r __localtime_r # endif # endif #endif /* POSIX || C2X */ /* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n" that is the representation of TP in this format. */ extern char *asctime (const struct tm *__tp) __THROW; /* Equivalent to `asctime (localtime (timer))'. */ #ifndef __USE_TIME_BITS64 extern char *ctime (const time_t *__timer) __THROW; #else # ifdef __REDIRECT_NTH extern char *__REDIRECT_NTH (ctime, (const time_t *__timer), __ctime64); # else # define ctime __ctime64 # endif #endif #ifdef __USE_POSIX /* Reentrant versions of the above functions. */ /* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n" that is the representation of TP in this format. */ extern char *asctime_r (const struct tm *__restrict __tp, char *__restrict __buf) __THROW; /* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'. */ #ifndef __USE_TIME_BITS64 extern char *ctime_r (const time_t *__restrict __timer, char *__restrict __buf) __THROW; #else # ifdef __REDIRECT_NTH extern char *__REDIRECT_NTH (ctime_r, (const time_t *__restrict __timer, char *__restrict __buf), __ctime64_r); # else # define ctime_r __ctime64_r # endif #endif #endif /* POSIX */ /* Defined in localtime.c. */ extern char *__tzname[2]; /* Current timezone names. */ extern int __daylight; /* If daylight-saving time is ever in use. */ extern long int __timezone; /* Seconds west of UTC. */ #ifdef __USE_POSIX /* Same as above. */ extern char *tzname[2]; /* Set time conversion information from the TZ environment variable. If TZ is not defined, a locale-dependent default is used. */ extern void tzset (void) __THROW; #endif #if defined __USE_MISC || defined __USE_XOPEN extern int daylight; extern long int timezone; #endif /* Nonzero if YEAR is a leap year (every 4 years, except every 100th isn't, and every 400th is). */ #define __isleap(year) \ ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) #if defined __USE_MISC || __GLIBC_USE (ISOC2X) # ifndef __USE_TIME_BITS64 /* Like `mktime', but for TP represents Universal Time, not local time. */ extern time_t timegm (struct tm *__tp) __THROW; # else # ifdef __REDIRECT_NTH extern time_t __REDIRECT_NTH (timegm, (struct tm *__tp), __timegm64); # else # define timegm __timegm64 # endif # endif #endif #ifdef __USE_MISC /* Miscellaneous functions many Unices inherited from the public domain localtime package. These are included only for compatibility. */ #ifndef __USE_TIME_BITS64 /* Another name for `mktime'. */ extern time_t timelocal (struct tm *__tp) __THROW; #else # ifdef __REDIRECT_NTH extern time_t __REDIRECT_NTH (timelocal, (struct tm *__tp), __mktime64); # endif #endif /* Return the number of days in YEAR. */ extern int dysize (int __year) __THROW __attribute__ ((__const__)); #endif #ifdef __USE_POSIX199309 # ifndef __USE_TIME_BITS64 /* Pause execution for a number of nanoseconds. This function is a cancellation point and therefore not marked with __THROW. */ extern int nanosleep (const struct timespec *__requested_time, struct timespec *__remaining); /* Get resolution of clock CLOCK_ID. */ extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW; /* Get current value of clock CLOCK_ID and store it in TP. */ extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW __nonnull((2)); /* Set clock CLOCK_ID to value TP. */ extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp) __THROW __nonnull((2)); # else # ifdef __REDIRECT extern int __REDIRECT (nanosleep, (const struct timespec *__requested_time, struct timespec *__remaining), __nanosleep64); extern int __REDIRECT_NTH (clock_getres, (clockid_t __clock_id, struct timespec *__res), __clock_getres64); extern int __REDIRECT_NTH (clock_gettime, (clockid_t __clock_id, struct timespec *__tp), __clock_gettime64) __nonnull((2)); extern int __REDIRECT_NTH (clock_settime, (clockid_t __clock_id, const struct timespec *__tp), __clock_settime64) __nonnull((2)); # else # define nanosleep __nanosleep64 # define clock_getres __clock_getres64 # define clock_gettime __clock_gettime64 # define clock_settime __clock_settime64 # endif # endif # ifdef __USE_XOPEN2K /* High-resolution sleep with the specified clock. This function is a cancellation point and therefore not marked with __THROW. */ # ifndef __USE_TIME_BITS64 extern int clock_nanosleep (clockid_t __clock_id, int __flags, const struct timespec *__req, struct timespec *__rem); # else # ifdef __REDIRECT extern int __REDIRECT (clock_nanosleep, (clockid_t __clock_id, int __flags, const struct timespec *__req, struct timespec *__rem), __clock_nanosleep_time64); # else # define clock_nanosleep __clock_nanosleep_time64 # endif # endif /* Return clock ID for CPU-time clock. */ extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW; # endif /* Create new per-process timer using CLOCK_ID. */ extern int timer_create (clockid_t __clock_id, struct sigevent *__restrict __evp, timer_t *__restrict __timerid) __THROW; /* Delete timer TIMERID. */ extern int timer_delete (timer_t __timerid) __THROW; /* Set timer TIMERID to VALUE, returning old value in OVALUE. */ # ifndef __USE_TIME_BITS64 extern int timer_settime (timer_t __timerid, int __flags, const struct itimerspec *__restrict __value, struct itimerspec *__restrict __ovalue) __THROW; /* Get current value of timer TIMERID and store it in VALUE. */ extern int timer_gettime (timer_t __timerid, struct itimerspec *__value) __THROW; # else # ifdef __REDIRECT_NTH extern int __REDIRECT_NTH (timer_settime, (timer_t __timerid, int __flags, const struct itimerspec *__restrict __value, struct itimerspec *__restrict __ovalue), __timer_settime64); extern int __REDIRECT_NTH (timer_gettime, (timer_t __timerid, struct itimerspec *__value), __timer_gettime64); # else # define timer_settime __timer_settime64 # define timer_gettime __timer_gettime64 # endif # endif /* Get expiration overrun for timer TIMERID. */ extern int timer_getoverrun (timer_t __timerid) __THROW; #endif #ifdef __USE_ISOC11 # ifndef __USE_TIME_BITS64 /* Set TS to calendar time based in time base BASE. */ extern int timespec_get (struct timespec *__ts, int __base) __THROW __nonnull ((1)); # else # ifdef __REDIRECT_NTH extern int __REDIRECT_NTH (timespec_get, (struct timespec *__ts, int __base), __timespec_get64) __nonnull ((1)); # else # define timespec_get __timespec_get64 # endif # endif #endif #if __GLIBC_USE (ISOC2X) # ifndef __USE_TIME_BITS64 /* Set TS to resolution of time base BASE. */ extern int timespec_getres (struct timespec *__ts, int __base) __THROW; # else # ifdef __REDIRECT_NTH extern int __REDIRECT_NTH (timespec_getres, (struct timespec *__ts, int __base), __timespec_getres64); # else # define timespec_getres __timespec_getres64 # endif # endif #endif #ifdef __USE_XOPEN_EXTENDED /* Set to one of the following values to indicate an error. 1 the DATEMSK environment variable is null or undefined, 2 the template file cannot be opened for reading, 3 failed to get file status information, 4 the template file is not a regular file, 5 an error is encountered while reading the template file, 6 memory allication failed (not enough memory available), 7 there is no line in the template that matches the input, 8 invalid input specification Example: February 31 or a time is specified that can not be represented in a time_t (representing the time in seconds since 00:00:00 UTC, January 1, 1970) */ extern int getdate_err; /* Parse the given string as a date specification and return a value representing the value. The templates from the file identified by the environment variable DATEMSK are used. In case of an error `getdate_err' is set. This function is a possible cancellation point and therefore not marked with __THROW. */ extern struct tm *getdate (const char *__string); #endif #ifdef __USE_GNU /* Since `getdate' is not reentrant because of the use of `getdate_err' and the static buffer to return the result in, we provide a thread-safe variant. The functionality is the same. The result is returned in the buffer pointed to by RESBUFP and in case of an error the return value is != 0 with the same values as given above for `getdate_err'. This function is not part of POSIX and therefore no official cancellation point. But due to similarity with an POSIX interface or due to the implementation it is a cancellation point and therefore not marked with __THROW. */ extern int getdate_r (const char *__restrict __string, struct tm *__restrict __resbufp); #endif __END_DECLS #endif /* time.h. */