#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/poll.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <errno.h>

int main(int argc, char **argv)
{
	int delay, ret;
	struct pollfd pfd;
	int pipesfd[2];

	printf("sp <delay>\n");

	if (argc != 2)
		return 1;
	delay = atoi(argv[1]);
	printf("delay %d.\n", delay);
	if (delay < 0 || delay > 1000)
		return 2;

	if (pipe(pipesfd) != 0) {
		fprintf(stderr, "pipe failed with errno %d.\n", errno);
		return 3;
	}
	pfd.fd = pipesfd[0];
	pfd.events = POLLIN;

	if (!fork()) {
		sleep(delay);
		write(pipesfd[1], "", 1);;
		return 0;
	}
	sleep(1);
	ret = poll(&pfd, 1, -1);
	printf("poll returned %d.\n", ret);

	if (pfd.revents)
		printf("   events %8xh revents %8xh.\n", pfd.events, pfd.revents);

	return 0;
}