#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <arpa/inet.h>

#define MAXBUF  256

int main()
{
	int ssock;
	int clen;
	struct sockaddr_in client_addr, server_addr;
	char buf[MAXBUF];

	strcpy(buf, "I miss you already!");

	/* ¼ÒÄÏÀ» »ý¼ºÇÑ´Ù */
	if ((ssock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
		perror("socket error : ");
		exit(1);
	}

	/* ¼­¹ö¿¡ ¿¬°áÇϱâ À§ÇÑ ¼­¹ö ÁÖ¼Ò ¿É¼ÇÀ» °áÁ¤ */
	memset(&server_addr,0, sizeof(server_addr));
	server_addr.sin_family 	= AF_INET;
	server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
	server_addr.sin_port 	= htons(3317);

	/* UDP·Î µ¥ÀÌÅ͸¦ Àü¼ÛÇÑ´Ù */
	sendto(ssock, (void*)buf, MAXBUF, 0, (struct sockaddr*)&server_addr
                                                          , sizeof(server_addr));
	printf("Send message : %s\n", buf);

	/* UDP·Î µ¥ÀÌÅ͸¦ ¼ö½ÅÇÑ´Ù */
	recvfrom(ssock, (void *)buf, MAXBUF, 0, (struct sockaddr*)&client_addr
                                                                       , &clen);
	printf("Receive message : %s\n", buf);
	
	close(ssock);

	return 0;
}