#include <poll.h>
#include <sys/socket.h>

#include <netinet/in.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* strdup */
#include <unistd.h> /* getopt */

#define PORT (22)

#define BACKLOG 20

#ifndef INFTIM
#define INFTIM (-1)
#endif


extern char *optarg;

int main(argc, argv)
	int argc;
	char *argv[];
{
	struct pollfd nfd;
	struct sockaddr_in saddr, caddr;
	int fd;
	int c;
	int clientfd;
	size_t len;
	unsigned short port = PORT;

	
	bzero(&saddr, sizeof(struct sockaddr_in));
	bzero(&caddr, sizeof(struct sockaddr_in));

	while ((c = getopt(argc, argv, "h:p:")) != -1) {
		switch (c) {
			case 'p':
				port = atoi(optarg);
				break;
			default:
				break;
		}
	}

	saddr.sin_family = AF_INET;
	saddr.sin_port   = htons(port);
	saddr.sin_addr.s_addr   = INADDR_ANY;

	fd = socket(AF_INET, SOCK_STREAM, 0);

	if (fd < 0) {
		printf("socket\n");
		exit(1);
	}

	if (bind(fd, (struct sockaddr *)&saddr, sizeof(struct sockaddr_in)) < 0) {
		printf("bind\n");
		exit(1);
	}

	if (listen(fd, BACKLOG) < 0) {
		printf("listen\n");
		exit(1);
	}

	len = sizeof(struct sockaddr_in);

	if ((clientfd = accept(fd, (struct sockaddr *)&caddr, &len)) < 0) {
		printf("accept: %s\n", strerror(errno)), exit(1);
	}

	printf("accept ok.\n");

	/* reset */	
	nfd.fd = clientfd;
	nfd.events = 0;
	nfd.revents = 0;

	if (poll(&nfd, 1, INFTIM) < 0) 
		printf("poll: %s\n", strerror(errno)), exit(1);

	if (nfd.revents & POLLERR) 
		printf("poll: POLLERR set\n");

	if (nfd.revents & POLLHUP)
		printf("poll: POLLHUP set\n");

	if (nfd.revents & POLLNVAL)
		printf("poll: POLLNVAL set\n"); /* should not happen */

	close(clientfd);
	printf("sever terminating\n");
	exit(0);
}