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

#include <unistd.h>
#include <time.h>
unsigned sleep(unsigned seconds)
{
	struct timespec tv = { .tv_sec = seconds, .tv_nsec = 0 };
	if (nanosleep(&tv, &tv))
		return tv.tv_sec;
	return 0;
}