84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
#ifndef _TIME_H
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#define _TIME_H
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#include <stddef.h>
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#include <sys/time.h>
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#include <sys/types.h>
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// Structure representing broken-down time.
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struct tm
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{
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int tm_sec;
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int tm_min;
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int tm_hour;
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int tm_mday;
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int tm_mon;
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int tm_year;
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int tm_wday;
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int tm_yday;
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int tm_isdst;
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};
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// Captures elapsed time with nanosecond precision.
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struct timespec
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{
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time_t tv_sec;
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long tv_nsec;
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};
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#define CLOCKS_PER_SEC 10000000 // Number of clock_t per second.
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#define CLOCK_REALTIME 0
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#define CLOCK_MONOTONIC 1
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#define CLOCK_PROCTIME 2
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* Returns a number representing how much CPU time has been used by this process. Divide this by CLOCKS_PER_SEC to
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* get the value in seconds. */
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clock_t clock(void);
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/* Returns the current UNIX time in seconds, which is also stored in tloc if it is nonnull. */
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time_t time(time_t* tloc);
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/* Retrieves precise time from a specific system clock. */
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int clock_gettime(clockid_t clock_id, struct timespec* tp);
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/* Converts the UNIX timestamp time to broken-down time in UTC. */
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struct tm* gmtime(const time_t* time);
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/* Converts the UNIX timestamp time to broken-down time in UTC. Thread-safe. */
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struct tm* gmtime_r(const time_t* time, struct tm* result);
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/* Converts the UNIX timestamp time to broken-down time in local time. */
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struct tm* localtime(const time_t* time);
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/* Converts the UNIX timestamp time to broken-down time in local time. Thread-safe. */
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struct tm* localtime_r(const time_t* time, struct tm* result);
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/* Returns a string representation of the broken-down time in the time structure. */
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char* asctime(const struct tm* time);
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/* Fills buf with the string representation of the broken-down time in the time structure. Thread-safe. */
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char* asctime_r(const struct tm* time, char buf[26]);
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/* Returns a string representation of time. */
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char* ctime(const time_t* time);
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/* Fills buf with a string representation of time. Thread-safe. */
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char* ctime_r(const time_t* time, char buf[26]);
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/* Returns the UNIX timestamp representation of the broken-down time in the time structure. */
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time_t mktime(struct tm* time);
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/* Fills str with a formatted string representation of time according to the format string. */
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size_t strftime(char* str, size_t max, const char* format, const struct tm* time);
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#ifdef __cplusplus
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}
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#endif
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#endif |