time.h

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#ifndef __TIME_H__
#define __TIME_H__
 
#include <signal.h>
#include <stdint.h>
#include <sys/types.h>
 
#define CLOCK_REALTIME 0
#define CLOCK_MONOTONIC 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);
 
#endif