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1 /* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
20 * ANSI Standard: 4.12 DATE and TIME <time.h>
25 #if !defined(__need_time_t) && !defined(__need_clock_t)
34 /* Get size_t and NULL from <stddef.h>. */
38 #endif /* <time.h> included. */
43 /* Processor clock ticks per second. */
44 #define CLOCKS_PER_SEC 1 /* ??? */
47 #define CLK_TCK 60 /* ??? */
50 #endif /* <time.h> included. */
53 #if !defined(__clock_t_defined) && \
54 (defined(_TIME_H) || defined(__need_clock_t))
55 #define __clock_t_defined 1
57 /* Returned by `clock'. */
58 typedef long int clock_t;
60 #endif /* clock_t not defined and <time.h> or need clock_t. */
63 #if !defined(__time_t_defined) && \
64 (defined(_TIME_H) || defined(__need_time_t))
65 #define __time_t_defined 1
67 #include <gnu/types.h>
69 /* Returned by `time'. */
70 typedef __time_t
time_t;
72 #endif /* time_t not defined and <time.h> or need time_t. */
77 /* Used by other time functions. */
80 int tm_sec
; /* Seconds. [0-61] (2 leap seconds) */
81 int tm_min
; /* Minutes. [0-59] */
82 int tm_hour
; /* Hours. [0-23] */
83 int tm_mday
; /* Day. [1-31] */
84 int tm_mon
; /* Month. [0-11] */
85 int tm_year
; /* Year - 1900. */
86 int tm_wday
; /* Day of week. [0-6] */
87 int tm_yday
; /* Days in year.[0-365] */
88 int tm_isdst
; /* DST. [-1/0/1]*/
89 long int tm_gmtoff
; /* Seconds west of UTC. */
90 __const
char *tm_zone
; /* Timezone abbreviation. */
93 #endif /* <time.h> included. */
97 /* Time used by the program so far (user time + system time).
98 The result / CLOCKS_PER_SECOND is program time in seconds. */
99 extern clock_t clock
__P ((void));
101 /* Return the current time and put it in *TIMER if TIMER is not NULL. */
102 extern time_t time
__P ((time_t *__timer
));
104 /* Return the difference between TIME1 and TIME0. */
105 extern double difftime
__P ((time_t __time1
, time_t __time0
))
106 __attribute__ ((__const__
));
108 /* Return the `time_t' representation of TP and normalize TP. */
109 extern time_t mktime
__P ((struct tm
*__tp
));
111 /* Subroutine of `mktime'. Return the `time_t' representation of TP and
112 normalize TP, given that a `struct tm *' maps to a `time_t' as performed
114 extern time_t __mktime_internal
__P ((struct tm
*__tp
,
115 struct tm
*(*__func
) (const time_t *,
119 /* Format TP into S according to FORMAT.
120 Write no more than MAXSIZE characters and return the number
121 of characters written, or 0 if it would exceed MAXSIZE. */
122 extern size_t strftime
__P ((char *__s
, size_t __maxsize
,
123 __const
char *__format
, __const
struct tm
*__tp
));
126 /* Return the `struct tm' representation of *TIMER
127 in Universal Coordinated Time (aka Greenwich Mean Time). */
128 extern struct tm
*gmtime
__P ((__const
time_t *__timer
));
130 /* Return the `struct tm' representation
131 of *TIMER in the local timezone. */
132 extern struct tm
*localtime
__P ((__const
time_t *__timer
));
134 #ifdef __USE_REENTRANT
135 /* Return the `struct tm' representation of *TIMER in UTC,
136 using *TP to store the result. */
137 extern struct tm
*__gmtime_r
__P ((__const
time_t *__timer
,
139 extern struct tm
*gmtime_r
__P ((__const
time_t *__timer
,
142 /* Return the `struct tm' representation of *TIMER in local time,
143 using *TP to store the result. */
144 extern struct tm
*__localtime_r
__P ((__const
time_t *__timer
,
146 extern struct tm
*localtime_r
__P ((__const
time_t *__timer
,
150 /* Compute the `struct tm' representation of *T,
151 offset OFFSET seconds east of UTC,
152 and store year, yday, mon, mday, wday, hour, min, sec into *TP. */
153 extern void __offtime
__P ((__const
time_t *__timer
,
157 /* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n"
158 that is the representation of TP in this format. */
159 extern char *asctime
__P ((__const
struct tm
*__tp
));
161 /* Equivalent to `asctime(localtime(timer))'. */
162 extern char *ctime
__P ((__const
time_t *__timer
));
165 /* Defined in localtime.c. */
166 extern char *__tzname
[2]; /* Current timezone names. */
167 extern int __daylight
; /* If it is daylight savings time. */
168 extern long int __timezone
; /* Seconds west of UTC. */
170 /* Set time conversion information from the TZ environment variable.
171 If TZ is not defined, a locale-dependent default is used. */
172 extern void __tzset
__P ((void));
176 extern char *tzname
[2];
178 /* Return the maximum length of a timezone name.
179 This is what `sysconf (_SC_TZNAME_MAX)' does. */
180 extern long int __tzname_max
__P ((void));
182 extern void tzset
__P ((void));
184 #define tzset() __tzset()
185 #endif /* Optimizing. */
190 extern long int timezone
;
192 /* Set the system time to *WHEN.
193 This call is restricted to the superuser. */
194 extern int stime
__P ((__const
time_t *__when
));
198 /* Nonzero if YEAR is a leap year (every 4 years,
199 except every 100th isn't, and every 400th is). */
200 #define __isleap(year) \
201 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
205 /* Miscellaneous functions many Unices inherited from the public domain
206 localtime package. These are included only for compatibility. */
208 /* Like `mktime', but for TP represents Universal Time, not local time. */
209 extern time_t timegm
__P ((struct tm
*__tp
));
211 /* Another name for `mktime'. */
212 extern time_t timelocal
__P ((struct tm
*__tp
));
214 /* Return the number of days in YEAR. */
215 extern int dysize
__P ((int __year
));
221 #endif /* <time.h> included. */
223 #endif /* <time.h> not already included. */
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