#include <math.h>

#include <stdint.h>

#include <stdio.h>

#include <time.h>

#define NSEC_PER_SEC 1000000000

void

sleep_sec(double sec)

{

time_t s = (time_t)sec;

intmax_t n = (s - (intmax_t)sec) * NSEC_PER_SEC;

struct timespec ts = {

.tv_sec = s,

.tv_nsec = n,

};

if (nanosleep(&ts, NULL) != 0) {

perror("nanosleep");

}

}

uint64_t

unix_time_now(void)

{

time_t t = time(NULL);

if (t < 0) {

perror("time");

return 0;

}

return (uint64_t)t;

}