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77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
#ifndef __TIME_H__
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# define __TIME_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stddef.h>
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#include <stdint.h>
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/* Number of ticks per second in a clock_t value. This is not necessarily the
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full precision (eg. the RTC has only 128 units per second). */
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#define CLOCKS_PER_SEC 1000000
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/* Represent process CPU time; unit is CLOCKS_PER_SEC. */
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typedef uint64_t clock_t;
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/* Represent a number of seconds since 1970-01-01 00:00:00 +0000 (UTC). */
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typedef int64_t time_t;
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/* Broken-down time. */
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struct tm {
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int tm_sec; /* Seconds (0..60) */
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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 of month (1..31) */
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int tm_mon; /* Month (0..11) */
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int tm_year; /* Years since 1900 */
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int tm_wday; /* Day of week, starting Sunday (0..6) */
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int tm_yday; /* Day of year (0..365) */
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int tm_isdst; /* Daylight Saving Time flag */
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};
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/* Full time specification with second/nanosecond precision. */
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struct timespec {
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time_t tv_sec;
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long tv_nsec;
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};
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/* Returns CPU time used by the program (in number of CLOCKS_PER_SEC). */
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extern clock_t clock(void);
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/* Time elapsed between __start and __end, in seconds. */
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double difftime(time_t __end, time_t __start);
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/* Normalizes __time and returns associated timestamp.
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TODO: Currently ignores the [tm_isdst] field. */
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extern time_t mktime(struct tm *__time);
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/* Determine current timestamp; also set it in __timeptr if non-NULL. */
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extern time_t time(time_t *__timeptr);
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/* Text representation, like "Sun Sep 16 01:03:52 1973\n". The returned string
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is statically allocated and is overwritten by every call. */
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extern char *asctime(const struct tm *__time);
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/* Convert calendar time to asctime()'s text representation. */
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extern char *ctime(const time_t *__time);
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/* Convert calendar time to broken-down time as UTC. */
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extern struct tm *gmtime(const time_t *__time);
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/* Convert calendar time to broken-down local time.
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TODO: We don't have timezones so this always returns UTC. */
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extern struct tm *localtime(const time_t *time);
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/* Formats __time according to the specified format; similar to snprintf().
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TODO: %g, %G, %V (week-based year), and %U, %W (week number) are not
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supported and substituted by "??". %z and %Z output nothing. */
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size_t strftime(char * __restrict__ __s, size_t __maxsize,
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const char * __restrict__ __format, const struct tm * __restrict__ __time);
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#ifdef __cplusplus
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}
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#endif
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#endif /*__TIME_H__*/
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