tcp_server

#include <iostream>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

int main(){
	int sock0;
	struct sockaddr_in addr;
	struct sockaddr_in client;
	unsigned int len;
	int sock;

	sock0 = socket(AF_INET, SOCK_STREAM, 0);

	addr.sin_family = AF_INET;
	addr.sin_port = htons(12345);
	addr.sin_addr.s_addr = INADDR_ANY;
	bind(sock0, (struct sockaddr *)&addr, sizeof(addr));

	listen(sock0, 5);
	std::cout<<"listen\r\n"<<std::endl;

	len = sizeof(client);
	sock = accept(sock0, (struct sockaddr *)&client, &len);
	std::cout<<"accepted\r\n"<<std::endl;

	int i=0;
	while(1){
		if(i==6){
			write(sock, "9", 5);
			i=0;
		}
		else if(i%2==0) write(sock, "0", 5);
		else if(i%2==1) write(sock, "1", 5);
		std::cout<<"write\r\n"<<std::endl;
		sleep(1);
		i++;
	}

	close(sock);

	close(sock0);
	std::cout<<"closed\r\n"<<std::endl;

	return 0;
}