67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
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/* The <time.h> header is used by the procedures that deal with time.
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* Handling time is surprisingly complicated, what with GMT, local time
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* and other factors. Although the Bishop of Ussher (1581-1656) once
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* calculated that based on the Bible, the world began on 12 Oct. 4004 BC
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* at 9 o'clock in the morning, in the UNIX world time begins at midnight,
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* 1 Jan. 1970 GMT. Before that, all was NULL and (void).
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*/
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#ifndef _TIME_H
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#define _TIME_H
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#define CLOCKS_PER_SEC 60 /* MINIX always uses 60 Hz, even in Europe */
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#ifdef _POSIX_SOURCE
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#define CLK_TCK CLOCKS_PER_SEC
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#endif
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#define NULL ((void *)0)
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#ifndef _SIZE_T
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#define _SIZE_T
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typedef unsigned int size_t; /* type returned by sizeof */
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#endif
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#ifndef _TIME_T
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#define _TIME_T
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typedef long time_t; /* time in sec since 1 Jan 1970 0000 GMT */
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#endif
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#ifndef _CLOCK_T
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#define _CLOCK_T
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typedef long clock_t; /* time in ticks since process started */
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#endif
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struct tm {
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int tm_sec; /* seconds after the minute [0, 59] */
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int tm_min; /* minutes after the hour [0, 59] */
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int tm_hour; /* hours since midnight [0, 23] */
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int tm_mday; /* day of the month [1, 31] */
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int tm_mon; /* months since January [0, 11] */
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int tm_year; /* years since 1900 */
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int tm_wday; /* days since Sunday [0, 6] */
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int tm_yday; /* days since January 1 [0, 365] */
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int tm_isdst; /* Daylight Saving Time flag */
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};
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/* Function Prototypes. */
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#ifndef _ANSI_H
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#include <ansi.h>
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#endif
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_PROTOTYPE( clock_t clock, (void) );
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_PROTOTYPE( double difftime, (time_t _time1, time_t _time0) );
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_PROTOTYPE( time_t mktime, (struct tm *_timeptr) );
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_PROTOTYPE( time_t time, (time_t *_timeptr) );
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_PROTOTYPE( char *asctime, (const struct tm *_timeptr) );
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_PROTOTYPE( char *ctime, (const time_t *_timer) );
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_PROTOTYPE( struct tm *gmtime, (const time_t *_timer) );
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_PROTOTYPE( struct tm *localtime, (const time_t *_timer) );
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_PROTOTYPE( size_t strftime, (char *_s, size_t _max, const char *_fmt,
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const struct tm *_timep) );
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#ifdef _POSIX_SOURCE
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_PROTOTYPE( void tzset, (void) );
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#endif
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#endif /* _TIME_H */
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