#include <sys/types.h>
#include <sys/poll.h>
#include <stdio.h>
#include <stdlib.h>

main(int ac, char **av)
{
	struct pollfd *pfd;
	int i, n;
	int fd;

	fd = atoi(av[1]);
	pfd = malloc(5000 * sizeof(*pfd));
	memset(pfd, 0, 5000 * sizeof(*pfd));
	for (i = 0; i < 5000; i++)
		pfd[i].fd = -1;
	pfd[fd].fd = 0;	/* stdin */
	pfd[fd].events = POLLIN;
	n = poll(pfd, fd + 1, INFTIM);
	printf("n = %d\n", n);
}