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330 lines
10 KiB
C
330 lines
10 KiB
C
/* Copyright (C) 1991,92,93,94,95,96,97,98,99 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/*
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* ISO C Standard: 4.12 DATE and TIME <time.h>
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*/
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#ifndef _TIME_H
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#if (! defined __need_time_t && !defined __need_clock_t && \
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! defined __need_timespec)
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# define _TIME_H 1
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# include <features.h>
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__BEGIN_DECLS
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#endif
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#ifdef _TIME_H
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/* Get size_t and NULL from <stddef.h>. */
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# define __need_size_t
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# define __need_NULL
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# include <stddef.h>
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/* This defines CLOCKS_PER_SEC, which is the number of processor clock
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ticks per second. */
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# include <bits/time.h>
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/* This is the obsolete POSIX.1-1988 name for the same constant. */
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# ifdef __USE_POSIX
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# ifndef CLK_TCK
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# define CLK_TCK CLOCKS_PER_SEC
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# endif
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# endif
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#endif /* <time.h> included. */
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#if !defined __clock_t_defined && (defined _TIME_H || defined __need_clock_t)
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# define __clock_t_defined 1
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# include <bits/types.h>
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/* Returned by `clock'. */
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typedef __clock_t clock_t;
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#endif /* clock_t not defined and <time.h> or need clock_t. */
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#undef __need_clock_t
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#if !defined __time_t_defined && (defined _TIME_H || defined __need_time_t)
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# define __time_t_defined 1
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# include <bits/types.h>
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/* Returned by `time'. */
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typedef __time_t time_t;
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#endif /* time_t not defined and <time.h> or need time_t. */
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#undef __need_time_t
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#if !defined __timespec_defined && \
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((defined _TIME_H && defined __USE_POSIX199309) || defined __need_timespec)
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# define __timespec_defined 1
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/* POSIX.1b structure for a time value. This is like a `struct timeval' but
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has nanoseconds instead of microseconds. */
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struct timespec
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{
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long int tv_sec; /* Seconds. */
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long int tv_nsec; /* Nanoseconds. */
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};
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#endif /* timespec not defined and <time.h> or need timespec. */
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#undef __need_timespec
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#ifdef _TIME_H
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/* Used by other time functions. */
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struct tm
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{
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int tm_sec; /* Seconds. [0-60] (1 leap second) */
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int tm_min; /* Minutes. [0-59] */
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int tm_hour; /* Hours. [0-23] */
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int tm_mday; /* Day. [1-31] */
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int tm_mon; /* Month. [0-11] */
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int tm_year; /* Year - 1900. */
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int tm_wday; /* Day of week. [0-6] */
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int tm_yday; /* Days in year.[0-365] */
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int tm_isdst; /* DST. [-1/0/1]*/
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# ifdef __USE_BSD
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long int tm_gmtoff; /* Seconds east of UTC. */
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__const char *tm_zone; /* Timezone abbreviation. */
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# else
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long int __tm_gmtoff; /* Seconds east of UTC. */
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__const char *__tm_zone; /* Timezone abbreviation. */
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# endif
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};
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#ifdef __USE_POSIX199309
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/* Clock ID used in clock and timer functions. */
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typedef __clockid_t clockid_t;
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/* Timer ID returned by `timer_create'. */
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typedef __timer_t timer_t;
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/* POSIX.1b structure for timer start values and intervals. */
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struct itimerspec
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{
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struct timespec it_interval;
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struct timespec it_value;
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};
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/* We can use a simple forward declaration. */
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struct sigevent;
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#endif /* POSIX.1b */
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/* Time used by the program so far (user time + system time).
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The result / CLOCKS_PER_SECOND is program time in seconds. */
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extern clock_t clock __P ((void));
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/* Return the current time and put it in *TIMER if TIMER is not NULL. */
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extern time_t time __P ((time_t *__timer));
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/* Return the difference between TIME1 and TIME0. */
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extern double difftime __P ((time_t __time1, time_t __time0))
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__attribute__ ((__const__));
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/* Return the `time_t' representation of TP and normalize TP. */
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extern time_t mktime __P ((struct tm *__tp));
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/* Format TP into S according to FORMAT.
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Write no more than MAXSIZE characters and return the number
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of characters written, or 0 if it would exceed MAXSIZE. */
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extern size_t strftime __P ((char *__restrict __s, size_t __maxsize,
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__const char *__restrict __format,
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__const struct tm *__restrict __tp));
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# ifdef __USE_XOPEN
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/* Parse S according to FORMAT and store binary time information in TP.
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The return value is a pointer to the first unparsed character in S. */
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extern char *strptime __P ((__const char *__s, __const char *__fmt,
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struct tm *__tp));
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# endif
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/* Return the `struct tm' representation of *TIMER
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in Universal Coordinated Time (aka Greenwich Mean Time). */
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extern struct tm *gmtime __P ((__const time_t *__timer));
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/* Return the `struct tm' representation
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of *TIMER in the local timezone. */
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extern struct tm *localtime __P ((__const time_t *__timer));
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# if defined __USE_POSIX || defined __USE_MISC
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/* Return the `struct tm' representation of *TIMER in UTC,
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using *TP to store the result. */
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extern struct tm *gmtime_r __P ((__const time_t *__restrict __timer,
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struct tm *__restrict __tp));
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/* Return the `struct tm' representation of *TIMER in local time,
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using *TP to store the result. */
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extern struct tm *localtime_r __P ((__const time_t *__restrict __timer,
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struct tm *__restrict __tp));
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# endif /* POSIX or misc */
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/* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n"
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that is the representation of TP in this format. */
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extern char *asctime __P ((__const struct tm *__tp));
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/* Equivalent to `asctime (localtime (timer))'. */
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extern char *ctime __P ((__const time_t *__timer));
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# if defined __USE_POSIX || defined __USE_MISC
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/* Reentrant versions of the above functions. */
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/* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n"
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that is the representation of TP in this format. */
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extern char *asctime_r __P ((__const struct tm *__restrict __tp,
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char *__restrict __buf));
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/* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'. */
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extern char *ctime_r __P ((__const time_t *__restrict __timer,
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char *__restrict __buf));
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# endif /* POSIX or misc */
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/* Defined in localtime.c. */
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extern char *__tzname[2]; /* Current timezone names. */
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extern int __daylight; /* If daylight-saving time is ever in use. */
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extern long int __timezone; /* Seconds west of UTC. */
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# ifdef __USE_POSIX
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/* Same as above. */
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extern char *tzname[2];
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/* Set time conversion information from the TZ environment variable.
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If TZ is not defined, a locale-dependent default is used. */
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extern void tzset __P ((void));
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# endif
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# if defined __USE_SVID || defined __USE_XOPEN
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extern int daylight;
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extern long int timezone;
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# endif
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# ifdef __USE_SVID
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/* Set the system time to *WHEN.
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This call is restricted to the superuser. */
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extern int stime __P ((__const time_t *__when));
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# endif
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/* Nonzero if YEAR is a leap year (every 4 years,
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except every 100th isn't, and every 400th is). */
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# define __isleap(year) \
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((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
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# ifdef __USE_MISC
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/* Miscellaneous functions many Unices inherited from the public domain
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localtime package. These are included only for compatibility. */
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/* Like `mktime', but for TP represents Universal Time, not local time. */
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extern time_t timegm __P ((struct tm *__tp));
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/* Another name for `mktime'. */
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extern time_t timelocal __P ((struct tm *__tp));
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/* Return the number of days in YEAR. */
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extern int dysize __P ((int __year));
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# endif
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# ifdef __USE_POSIX199309
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/* Pause execution for a number of nanoseconds. */
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extern int nanosleep __P ((__const struct timespec *__requested_time,
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struct timespec *__remaining));
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/* Get resolution of clock CLOCK_ID. */
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extern int clock_getres __P ((clockid_t __clock_id, struct timespec *__res));
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/* Get current value of clock CLOCK_ID and store it in TP. */
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extern int clock_gettime __P ((clockid_t __clock_id, struct timespec *__tp));
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/* Set clock CLOCK_ID to value TP. */
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extern int clock_settime __P ((clockid_t __clock_id,
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__const struct timespec *__tp));
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/* Create new per-process timer using CLOCK_ID. */
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extern int timer_create __P ((clockid_t __clock_id, struct sigevent *__evp,
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timer_t *__timerid));
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/* Delete timer TIMERID. */
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extern int timer_delete __P ((timer_t __timerid));
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/* Set timer TIMERID to VALUE, returning old value in OVLAUE. */
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extern int timer_settime __P ((timer_t __timerid, int __flags,
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__const struct itimerspec *__value,
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struct itimerspec *__ovalue));
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/* Get current value of timer TIMERID and store it in VLAUE. */
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extern int timer_gettime __P ((timer_t __timerid, struct itimerspec *__value));
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/* Get expiration overrun for timer TIMERID. */
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extern int timer_getoverrun __P ((timer_t __timerid));
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# endif
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# ifdef __USE_XOPEN_EXTENDED
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/* Set to one of the following values to indicate an error.
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1 the DATEMSK environment variable is null or undefined,
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2 the template file cannot be opened for reading,
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3 failed to get file status information,
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4 the template file is not a regular file,
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5 an error is encountered while reading the template file,
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6 memory allication failed (not enough memory available),
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7 there is no line in the template that matches the input,
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8 invalid input specification Example: February 31 or a time is
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specified that can not be represented in a time_t (representing
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the time in seconds since 00:00:00 UTC, January 1, 1970) */
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extern int getdate_err;
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/* Parse the given string as a date specification and return a value
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representing the value. The templates from the file identified by
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the environment variable DATEMSK are used. In case of an error
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`getdate_err' is set. */
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extern struct tm *getdate __P ((__const char *__string));
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# endif
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# ifdef __USE_GNU
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/* Since `getdate' is not reentrant because of the use of `getdate_err'
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and the static buffer to return the result in, we provide a thread-safe
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variant. The functionality is the same. The result is returned in
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the buffer pointed to by RESBUFP and in case of an error the return
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value is != 0 with the same values as given above for `getdate_err'. */
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extern int getdate_r __P ((__const char *__restrict __string,
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struct tm *__restrict __resbufp));
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# endif
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__END_DECLS
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#endif /* <time.h> included. */
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#endif /* <time.h> not already included. */
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