//#define _POSIX_SOURCE
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <netdb.h>

int main(int argc, char * argv[])
{
	int sockfd, rv;
	// struct sockaddr_in addr;
	char buf[100];
	struct addrinfo hints, *res, *ressave;

	if (argc < 3) {
		printf("Usage: a.out hostname_or_ip_addr port.\n");
		exit(0);
	}

	memset(&hints, 0, sizeof(hints));
	hints.ai_family = AF_INET;
	hints.ai_socktype = SOCK_STREAM;

	if ((rv = getaddrinfo(argv[1], argv[2], &hints, &res)) != 0) {
		fprintf(stderr, "%s\n", gai_strerror(rv));
		exit(1);
	}

	ressave = res;
	do {
		if ((sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) < 0) {
			continue;
		}
		if (!connect(sockfd, res->ai_addr, res->ai_addrlen)) {
			break;
		}
		close(sockfd);
	} while ((res = res->ai_next) != NULL);
	freeaddrinfo(ressave);

	/*
	   if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
	   perror(": Can't get socket");
	   exit(1);
	   }

	   memset(&addr, 0, sizeof(struct sockaddr_in));
	   addr.sin_family = AF_INET;
	   addr.sin_port = htons((short)atoi(argv[2]));
	   addr.sin_addr.s_addr = inet_addr(argv[1]);

	   if (connect(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
	   perror(": connect");
	   exit(1);
	   }
	   */

	// A connection has been established
	printf("out of connect.\n"); fflush(0);

	// send an integer value
	// convert it to network-byte order before sending
	{ int ii;
		ii = 100;
		printf("ii= %d %x\n", ii, ii);
		//write(sockfd, &ii , sizeof(int));
		int i2 = htonl(ii);
		write(sockfd, &i2 , sizeof(int));
	}

	while (fgets(buf, 100, stdin)) {
		write(sockfd, buf, strlen(buf)+1);
		if (read(sockfd, buf, 100)==0) {
			printf("server closed the connection.\n");
			exit(0);
		};
		printf("Server response : %s\n", buf);
	}
}