thrd_sleep.c\thread\src - musl - musl - an implementation of the standard library for Linux-based systems

#include <threads.h>
#include <time.h>
#include <errno.h>
#include "syscall.h"
int thrd_sleep(const struct timespec *req, struct timespec *rem)
{
	int ret = -__clock_nanosleep(CLOCK_REALTIME, 0, req, rem);
	switch (ret) {
	case 0: return 0;
	case -EINTR: return -1; /* value specified by C11 */
	default: return -2;
	}
}