#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <sys/un.h>
#include <sys/time.h>
#include <signal.h>
#include <errno.h>
#include <arpa/inet.h>

int main(int argc, char *argv[])
{
	int c_fd,s_fd=socket(AF_INET,SOCK_STREAM,0);
	struct sockaddr_in s_addr,c_addr;
	int c_len,result,sec=20;
	string ch="hello";
	
	s_addr.sin_port = htons(4321);
	s_addr.sin_addr.s_addr = INADDR_ANY;
	s_addr.sin_family = AF_INET;
	bind(s_fd,(struct sockaddr *)&s_addr,sizeof(s_addr));
	listen(s_fd,5);
	
	result=0;
	printf("Server Waiting...\n");

	c_len=sizeof(c_addr);
	c_fd=accept(s_fd,(struct sockaddr *)&c_addr,&c_len);
	if (c_fd==-1){
		perror("accept error");
		exit(1);
	}

	recv(c_fd,&ch,1,0);
	printf("recieve a char:%c\n",ch);
	if (send(c_fd,&ch,1,0)!=1){
		perror("send failed");
		exit(1);
	}
	printf("send a char:%c\n",ch);
	close(c_fd);
	close(s_fd);
}