time.h

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#ifndef __TIME_H__
#define __TIME_H__
 
#include <signal.h>
#include <stddef.h>
#include <stdint.h>
#include <sys/types.h>
 
#define CLOCK_REALTIME 0
#define CLOCK_MONOTONIC 1
#define TIMER_ABSTIME 1
 
struct timespec {
    time_t tv_sec; /* Seconds */
    long tv_nsec;  /* Nanoseconds */
};
 
struct itimerspec {
    struct timespec it_value;
    struct timespec it_interval;
};
 
int clock_getres(clockid_t clockid, struct timespec *res);
 
int clock_gettime(clockid_t clockid, struct timespec *tp);
 
int clock_settime(clockid_t clockid, const struct timespec *tp);
 
int timer_create(clockid_t clockid, struct sigevent *sevp, timer_t *timerid);
 
int timer_delete(timer_t timerid);
 
int timer_settime(timer_t timerid,
                  int flags,
                  const struct itimerspec *new_value,
                  struct itimerspec *old_value);
 
int timer_gettime(timer_t timerid, struct itimerspec *curr_value);
 
time_t time(time_t *tloc);
 
int nanosleep(const struct timespec *req, struct timespec *rem);
 
int clock_nanosleep(clockid_t clockid,
                    int flags,
                    const struct timespec *req,
                    struct timespec *rem);
 
/* Broken down time. The layout matches newlib, whose implementations of the
 * calendar helpers below are the ones that get linked
 */
struct tm {
    int tm_sec;
    int tm_min;
    int tm_hour;
    int tm_mday;
    int tm_mon;
    int tm_year;
    int tm_wday;
    int tm_yday;
    int tm_isdst;
};
 
struct tm *localtime(const time_t *timep);
struct tm *localtime_r(const time_t *timep, struct tm *result);
struct tm *gmtime(const time_t *timep);
struct tm *gmtime_r(const time_t *timep, struct tm *result);
time_t mktime(struct tm *tm);
size_t strftime(char *s, size_t max, const char *format, const struct tm *tm);
 
/* Reads back what strftime() writes. The C library brings this one: it reads
 * a string and writes a struct, and asks the system for nothing
 */
char *strptime(const char *s, const char *format, struct tm *tm);
char *ctime(const time_t *timep);
char *ctime_r(const time_t *timep, char *buf);
 
#endif