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f8cac037ee
* FAQ: New file contributed by drepper. * time/Makefile (headers): Add timebits.h. * sysdeps/unix/sysv/linux/timebits.h: New file. * sysdeps/stub/timebits.h: New file. * time/time.h (CLK_TCK): Define to CLOCKS_PER_SEC. (CLOCKS_PER_SEC): Remove this macro. Instead #include <timebits.h>.
243 lines
7.2 KiB
C
243 lines
7.2 KiB
C
/* Copyright (C) 1991, 92, 93, 94, 95, 96 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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/*
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* ANSI 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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#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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#endif /* <time.h> included. */
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#ifdef _TIME_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 <timebits.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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#define CLK_TCK CLOCKS_PER_SEC
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#endif
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#endif /* <time.h> included. */
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#if !defined(__clock_t_defined) && \
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(defined(_TIME_H) || defined(__need_clock_t))
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#define __clock_t_defined 1
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/* Returned by `clock'. */
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typedef long int 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) && \
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(defined(_TIME_H) || defined(__need_time_t))
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#define __time_t_defined 1
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#include <gnu/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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#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. [0-61] (2 leap seconds) */
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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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long int tm_gmtoff; /* Seconds west of UTC. */
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__const char *tm_zone; /* Timezone abbreviation. */
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};
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#endif /* <time.h> included. */
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#ifdef _TIME_H
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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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/* Subroutine of `mktime'. Return the `time_t' representation of TP and
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normalize TP, given that a `struct tm *' maps to a `time_t' as performed
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by FUNC. Keep track of next guess for time_t offset in *OFFSET. */
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extern time_t __mktime_internal __P ((struct tm *__tp,
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struct tm *(*__func) (const time_t *,
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struct tm *),
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time_t *__offset));
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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 *__s, size_t __maxsize,
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__const char *__format, __const struct tm *__tp));
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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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#ifdef __USE_REENTRANT
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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 *__timer,
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struct tm *__tp));
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extern struct tm *gmtime_r __P ((__const time_t *__timer,
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struct tm *__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 *__timer,
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struct tm *__tp));
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extern struct tm *localtime_r __P ((__const time_t *__timer,
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struct tm *__tp));
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#endif
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/* Compute the `struct tm' representation of *T,
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offset OFFSET seconds east of UTC,
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and store year, yday, mon, mday, wday, hour, min, sec into *TP. */
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extern void __offtime __P ((__const time_t *__timer,
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long int __offset,
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struct tm *__TP));
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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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/* Defined in localtime.c. */
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extern char *__tzname[2]; /* Current timezone names. */
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extern int __daylight; /* If it is daylight savings time. */
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extern long int __timezone; /* Seconds west of UTC. */
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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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#ifdef __USE_POSIX
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/* Same as above. */
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extern char *tzname[2];
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/* Return the maximum length of a timezone name.
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This is what `sysconf (_SC_TZNAME_MAX)' does. */
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extern long int __tzname_max __P ((void));
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extern void tzset __P ((void));
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#ifdef __OPTIMIZE__
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#define tzset() __tzset()
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#endif /* Optimizing. */
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#endif
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#ifdef __USE_SVID
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extern int daylight;
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extern long int timezone;
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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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/* POSIX.4 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 ts_sec; /* Seconds. */
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long int ts_nsec; /* Nanoseconds. */
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};
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#ifdef __USE_POSIX
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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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#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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