/* Copyright (C) 1991, 92, 93, 94, 95, 96 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 Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* * ANSI Standard: 4.12 DATE and TIME */ #ifndef _TIME_H #if !defined(__need_time_t) && !defined(__need_clock_t) #define _TIME_H 1 #include __BEGIN_DECLS #endif #ifdef _TIME_H /* Get size_t and NULL from . */ #define __need_size_t #define __need_NULL #include #endif /* included. */ #ifdef _TIME_H /* This defines CLOCKS_PER_SEC, which is the number of processor clock ticks per second. */ #include /* This is the obsolete POSIX.1-1988 name for the same constant. */ #ifdef __USE_POSIX #define CLK_TCK CLOCKS_PER_SEC #endif #endif /* included. */ #if !defined(__clock_t_defined) && \ (defined(_TIME_H) || defined(__need_clock_t)) #define __clock_t_defined 1 #include /* Returned by `clock'. */ typedef __clock_t clock_t; #endif /* clock_t not defined and or need clock_t. */ #undef __need_clock_t #if !defined(__time_t_defined) && \ (defined(_TIME_H) || defined(__need_time_t)) #define __time_t_defined 1 #include /* Returned by `time'. */ typedef __time_t time_t; #endif /* time_t not defined and or need time_t. */ #undef __need_time_t #ifdef _TIME_H /* Used by other time functions. */ struct tm { int tm_sec; /* Seconds. [0-61] (2 leap seconds) */ 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 west of UTC. */ __const char *tm_zone; /* Timezone abbreviation. */ }; #endif /* included. */ #ifdef _TIME_H /* 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 __P ((void)); /* Return the current time and put it in *TIMER if TIMER is not NULL. */ extern time_t time __P ((time_t *__timer)); /* Return the difference between TIME1 and TIME0. */ extern double difftime __P ((time_t __time1, time_t __time0)) __attribute__ ((__const__)); /* Return the `time_t' representation of TP and normalize TP. */ extern time_t mktime __P ((struct tm *__tp)); /* Subroutine of `mktime'. Return the `time_t' representation of TP and normalize TP, given that a `struct tm *' maps to a `time_t' as performed by FUNC. Keep track of next guess for time_t offset in *OFFSET. */ extern time_t __mktime_internal __P ((struct tm *__tp, struct tm *(*__func) (const time_t *, struct tm *), time_t *__offset)); /* 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 __P ((char *__s, size_t __maxsize, __const char *__format, __const struct tm *__tp)); #ifdef __USE_MISC /* 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 __P ((__const char *__s, __const char *__fmt, struct tm *__tp)); #endif /* Return the `struct tm' representation of *TIMER in Universal Coordinated Time (aka Greenwich Mean Time). */ extern struct tm *gmtime __P ((__const time_t *__timer)); /* Return the `struct tm' representation of *TIMER in the local timezone. */ extern struct tm *localtime __P ((__const time_t *__timer)); #ifdef __USE_REENTRANT /* Return the `struct tm' representation of *TIMER in UTC, using *TP to store the result. */ extern struct tm *__gmtime_r __P ((__const time_t *__timer, struct tm *__tp)); extern struct tm *gmtime_r __P ((__const time_t *__timer, struct tm *__tp)); /* Return the `struct tm' representation of *TIMER in local time, using *TP to store the result. */ extern struct tm *__localtime_r __P ((__const time_t *__timer, struct tm *__tp)); extern struct tm *localtime_r __P ((__const time_t *__timer, struct tm *__tp)); #endif /* Compute the `struct tm' representation of *T, offset OFFSET seconds east of UTC, and store year, yday, mon, mday, wday, hour, min, sec into *TP. */ extern void __offtime __P ((__const time_t *__timer, long int __offset, struct tm *__TP)); /* 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 __P ((__const struct tm *__tp)); /* Equivalent to `asctime(localtime(timer))'. */ extern char *ctime __P ((__const time_t *__timer)); /* Defined in localtime.c. */ extern char *__tzname[2]; /* Current timezone names. */ extern int __daylight; /* If it is daylight savings time. */ extern long int __timezone; /* Seconds west of UTC. */ /* Set time conversion information from the TZ environment variable. If TZ is not defined, a locale-dependent default is used. */ extern void __tzset __P ((void)); #ifdef __USE_POSIX /* Same as above. */ extern char *tzname[2]; /* Return the maximum length of a timezone name. This is what `sysconf (_SC_TZNAME_MAX)' does. */ extern long int __tzname_max __P ((void)); extern void tzset __P ((void)); #ifdef __OPTIMIZE__ #define tzset() __tzset() #endif /* Optimizing. */ #endif #ifdef __USE_SVID extern int daylight; extern long int timezone; /* Set the system time to *WHEN. This call is restricted to the superuser. */ extern int stime __P ((__const time_t *__when)); #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 __P ((struct tm *__tp)); /* Another name for `mktime'. */ extern time_t timelocal __P ((struct tm *__tp)); /* Return the number of days in YEAR. */ extern int dysize __P ((int __year)); #endif /* POSIX.4 structure for a time value. This is like a `struct timeval' but has nanoseconds instead of microseconds. */ struct timespec { long int ts_sec; /* Seconds. */ long int ts_nsec; /* Nanoseconds. */ }; #ifdef __USE_POSIX /* Pause execution for a number of nanoseconds. */ extern int nanosleep __P ((__const struct timespec *__requested_time, struct timespec *__remaining)); #endif __END_DECLS #endif /* included. */ #endif /* not already included. */