#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <unistd.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <errno.h>

int main(int argc, const char * argv[]) {
    char quit='q';
    int server_sockfd;
    int client_sockfd;
    int len;
    struct sockaddr_in my_add;
    struct sockaddr_in remote_addr;
    socklen_t sin_size;
    char buf[BUFSIZ];
    memset(&my_add,0,sizeof(my_add));
    my_add.sin_family = AF_INET;
    my_add.sin_addr.s_addr = INADDR_ANY;
    my_add.sin_port = htons(8000);
    
    server_sockfd=socket(PF_INET, SOCK_STREAM, 0);
    
    bind(server_sockfd, (struct sockaddr *)&my_add, sizeof(struct sockaddr));
    
    listen(server_sockfd, 5);
    sin_size = sizeof(struct sockaddr_in);
    
    client_sockfd=accept(server_sockfd, (struct sockaddr *)&remote_addr, &sin_size);
    
    printf("accept client %s\n",inet_ntoa(remote_addr.sin_addr));
    len = send(client_sockfd, "welcome to my server\n", 21, 0);
    
    while (1) {
	memset(buf,0,sizeof(buf));
	len = recv(client_sockfd, buf, BUFSIZ, 0);
	send(client_sockfd,buf, len, 0);
        buf[len]='\0';
        printf("receive:%s\n",buf);
	if(buf[0]=='q'){
		send(client_sockfd,&quit, 1, 0);
		break;
	}
    }
    close(client_sockfd);
    close(server_sockfd);
    return 0;
}