/* Copyright (C) 1991-2018 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

   <http://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;

/* 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;

/* 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

/* 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;

#ifdef __USE_POSIX

/* 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;

#endif	/* POSIX */

/* 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))'.  */

extern char *ctime (const time_t *__timer) __THROW;

#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)'.  */

extern char *ctime_r (const time_t *__restrict __timer,

		      char *__restrict __buf) __THROW;

#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

#ifdef __USE_MISC

/* Set the system time to *WHEN.

   This call is restricted to the superuser.  */

extern int stime (const time_t *__when) __THROW;

#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))

#ifdef __USE_MISC

/* Miscellaneous functions many Unices inherited from the public domain

   localtime package.  These are included only for compatibility.  */

/* Like `mktime', but for TP represents Universal Time, not local time.  */

extern time_t timegm (struct tm *__tp) __THROW;

/* Another name for `mktime'.  */

extern time_t timelocal (struct tm *__tp) __THROW;

/* Return the number of days in YEAR.  */

extern int dysize (int __year) __THROW  __attribute__ ((__const__));

#endif

#ifdef __USE_POSIX199309

/* 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;

/* Set clock CLOCK_ID to value TP.  */

extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp)

     __THROW;

# ifdef __USE_XOPEN2K

/* High-resolution sleep with the specified clock.

   This function is a cancellation point and therefore not marked with

   __THROW.  */

extern int clock_nanosleep (clockid_t __clock_id, int __flags,

			    const struct timespec *__req,

			    struct timespec *__rem);

/* 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.  */

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;

/* Get expiration overrun for timer TIMERID.  */

extern int timer_getoverrun (timer_t __timerid) __THROW;

#endif

#ifdef __USE_ISOC11

/* Set TS to calendar time based in time base BASE.  */

extern int timespec_get (struct timespec *__ts, int __base)

     __THROW __nonnull ((1));

#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.  */