Time.h

/* Copyright (C) 1991-1999,2000,2001,2002,2003,2006 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA. */ /* *	ISO C99 Standard: 7.23 Date and time	  */ ! defined __need_timespec) __BEGIN_DECLS /* Get size_t and NULL from . */ /* This defines CLOCKS_PER_SEC, which is the number of processor clock    ticks per second.  */ /* This is the obsolete POSIX.1-1988 name for the same constant.  */ __BEGIN_NAMESPACE_STD /* Returned by `clock'.  */ typedef __clock_t clock_t; __END_NAMESPACE_STD __USING_NAMESPACE_STD(clock_t) __BEGIN_NAMESPACE_STD /* Returned by `time'.  */ typedef __time_t time_t; __END_NAMESPACE_STD __USING_NAMESPACE_STD(time_t)    ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_clockid_t) /* Clock ID used in clock and timer functions.  */ typedef __clockid_t clockid_t;     ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_timer_t) /* Timer ID returned by `timer_create'.  */ typedef __timer_t timer_t;     ((defined _TIME_H &&					\       (defined __USE_POSIX199309 || defined __USE_MISC)) ||	\ defined __need_timespec) /* POSIX.1b structure for a time value. This is like a `struct timeval' but    has nanoseconds instead of microseconds.  */ struct timespec   {     __time_t tv_sec;		/* Seconds.  */     long int tv_nsec;		/* Nanoseconds.  */   }; __BEGIN_NAMESPACE_STD /* Used by other time functions.  */ struct tm {   int tm_sec;			/* Seconds.	[0-60] (1 leap second) */   int tm_min;			/* Minutes.	[0-59] */   int tm_hour;			/* Hours.	[0-23] */   int tm_mday;			/* Day.		[1-31] */   int tm_mon;			/* Month.	[0-11] */   int tm_year;			/* Year	- 1900.  */   int tm_wday;			/* Day of week.	[0-6] */   int tm_yday;			/* Days in year.[0-365]	*/   int tm_isdst;			/* DST.		[-1/0/1]*/   long int tm_gmtoff;		/* Seconds east of UTC.  */   __const char *tm_zone;	/* Timezone abbreviation.  */   long int __tm_gmtoff;		/* Seconds east of UTC.  */   __const char *__tm_zone;	/* Timezone abbreviation. */ }; __END_NAMESPACE_STD __USING_NAMESPACE_STD(tm) /* POSIX.1b structure for timer start values and intervals. */ struct itimerspec {    struct timespec it_interval; struct timespec it_value; }; /* We can use a simple forward declaration. */ struct sigevent; typedef __pid_t pid_t; __BEGIN_NAMESPACE_STD /* Time used by the program so far (user time + system time). The result / CLOCKS_PER_SECOND 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; __END_NAMESPACE_STD /* 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; /* 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; extern char *strptime_l (__const char *__restrict __s, 			 __const char *__restrict __fmt, struct tm *__tp, 			 __locale_t __loc) __THROW; __BEGIN_NAMESPACE_STD /* 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; __END_NAMESPACE_STD /* 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; __BEGIN_NAMESPACE_STD /* 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; __END_NAMESPACE_STD /* 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; /* 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. */ /* 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; extern int daylight; extern long int timezone; /* Set the system time to *WHEN. This call is restricted to the superuser. */ extern int stime (__const time_t *__when) __THROW; /* Nonzero if YEAR is a leap year (every 4 years,   except every 100th isn't, and every 400th is). */  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) /* 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__)); /* 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; /* 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; /* 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 OVLAUE. */ 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 VLAUE. */ 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; /* 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 points and therefore not marked with __THROW. */ extern struct tm *getdate (__const char *__string); /* 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); __END_DECLS
 * 1) ifndef	_TIME_H
 * 1) if (! defined __need_time_t && !defined __need_clock_t && \
 * 1) define _TIME_H	1
 * 2) include 
 * 1) endif
 * 1) ifdef	_TIME_H
 * 1) define __need_size_t
 * 2) define __need_NULL
 * 3) include 
 * 1) include 
 * 1) if !defined __STRICT_ANSI__ && !defined __USE_XOPEN2K
 * 2)  ifndef CLK_TCK
 * 3)   define CLK_TCK	CLOCKS_PER_SEC
 * 4)  endif
 * 5) endif
 * 1) endif /*  included. */
 * 1) if !defined __clock_t_defined && (defined _TIME_H || defined __need_clock_t)
 * 2) define __clock_t_defined	1
 * 1) include 
 * 1) if defined __USE_XOPEN || defined __USE_POSIX || defined __USE_MISC
 * 1) endif
 * 1) endif /* clock_t not defined and  or need clock_t. */
 * 2) undef	__need_clock_t
 * 1) if !defined __time_t_defined && (defined _TIME_H || defined __need_time_t)
 * 2) define __time_t_defined	1
 * 1) include 
 * 1) if defined __USE_POSIX || defined __USE_MISC || defined __USE_SVID
 * 1) endif
 * 1) endif /* time_t not defined and  or need time_t. */
 * 2) undef	__need_time_t
 * 1) if !defined __clockid_t_defined && \
 * 1) define __clockid_t_defined	1
 * 1) include 
 * 1) endif /* clockid_t not defined and  or need clockid_t. */
 * 2) undef	__clockid_time_t
 * 1) if !defined __timer_t_defined && \
 * 1) define __timer_t_defined	1
 * 1) include 
 * 1) endif /* timer_t not defined and  or need timer_t. */
 * 2) undef	__need_timer_t
 * 1) if !defined __timespec_defined &&				\
 * 1) define __timespec_defined	1
 * 1) include 	/* This defines __time_t for us.  */
 * 1) endif /* timespec not defined and  or need timespec. */
 * 2) undef	__need_timespec
 * 1) ifdef	_TIME_H
 * 1) ifdef	__USE_BSD
 * 1) else
 * 1) endif
 * 1) if defined __USE_XOPEN || defined __USE_POSIX || defined __USE_MISC
 * 1) endif
 * 1) ifdef __USE_POSIX199309
 * 1) endif	/* POSIX.1b */
 * 1) ifdef __USE_XOPEN2K
 * 2) ifndef __pid_t_defined
 * 1)  define __pid_t_defined
 * 2) endif
 * 3) endif
 * 1) ifdef __USE_XOPEN
 * 1) endif
 * 1) ifdef __USE_GNU
 * 1) include <xlocale.h>
 * 1) endif
 * 1) if defined __USE_POSIX || defined __USE_MISC
 * 1) endif	/* POSIX or misc */
 * 1) if defined __USE_POSIX || defined __USE_MISC
 * 1) endif	/* POSIX or misc */
 * 1) ifdef	__USE_POSIX
 * 1) endif
 * 1) if defined __USE_SVID || defined __USE_XOPEN
 * 1) endif
 * 1) ifdef __USE_SVID
 * 1) endif
 * 1) define __isleap(year)	\
 * 1) ifdef __USE_MISC
 * 1) endif
 * 1) ifdef __USE_POSIX199309
 * 1)  ifdef __USE_XOPEN2K
 * 1)  endif
 * 1) endif
 * 1) ifdef __USE_XOPEN_EXTENDED
 * 1) endif
 * 1) ifdef __USE_GNU
 * 1) endif
 * 1) endif /* <time.h> included. */
 * 1) endif /* <time.h> not already included. */