#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <sys/socket.h>
#include <netinet/in.h>


extern char *optarg;

#define HOST "192.168.0.1"
#define PORT 0

void handler(int);

int main(int argc, char **argv)
{
	struct sockaddr_in saddr;
	int ret;
	int fd;
	char buf[BUFSIZ];
	int val;
	int c;
	unsigned short port = PORT;
	size_t len;
	char *host = HOST;

	val = 0;
	len = sizeof(val);

	while ((c = getopt(argc, argv, "h:p:")) != -1) {
		switch (c) {
			case 'h':
				host = (char *)strdup(optarg);
				break;
			case 'p':
				port = atoi(optarg);
				break;
			default:
				break;
		}
	}
	
	memset(&saddr, 0, sizeof(struct sockaddr_in));

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

	fd = socket(AF_INET, SOCK_STREAM, 0);

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

	val = fcntl(fd, F_GETFL);

	if (val < 0) {
		printf("fcntl get\n");
		exit(1);
	}

	ret = fcntl(fd, F_SETFL, val | O_NONBLOCK);

	if (ret < 0) {
		printf("fcntl set\n");	
		exit(1);
	}



	ret = connect(fd, (struct sockaddr *)&saddr, 
			sizeof(struct sockaddr_in));

	if (ret < 0) {
		if (errno == EINPROGRESS) {
			printf("connect: EINPROGRESS (expected)\n");
		} else {
			printf("unexpected errno from connect, errno = %d"
			    " msg = %s\n", errno, strerror(errno));
		}
	}

	/* make sure errno is 0 */
	errno = 0;

	val = read(fd, buf, 0);
		printf("read() returns %d, errno = %d, msg = %s\n", 
			val, errno, (val < 0) ? strerror(errno) : "");

	errno = 0;
	ret = connect(fd, (struct sockaddr *)&saddr,
		sizeof(struct sockaddr_in));

	printf("connect returns %d, err = %s\n", ret, strerror(errno));

	close(fd);

	exit(0);
}