소켓프로그래밍 질문드려요

#define DEFALUT 1024
 
int main(int argc, char* argv[])
{
    int server, client;
    int client_len, n;
    char buf[DEFALUT];
    struct sockaddr_in serveraddr, clientaddr;
 
    client_len = sizeof(clientaddr);
 
    if((server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) == -1))
    {
        perror("socket error :");
        exit(0);
    }
 
    memset(&serveraddr, 0x00, sizeof(serveraddr));
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_port = htons(atoi(argv[1]));
    serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
 
    bind(server, (struct sockaddr*)&serveraddr, sizeof(serveraddr));
 
    listen(server, 5);
 
    client = accept(server, (struct sockaddr*)&clientaddr, &client_len);
    close(server);
 
    return 0;
}

#define MAXBUF 1024
 
int main(int argc, char* argv[])
{
    int server_sockfd, client_sockfd;
    int client_len, n;
    char buf[MAXBUF];
    struct sockaddr_in clientaddr, serveraddr;
 
    client_len = sizeof(clientaddr);
 
    if((server_sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
    {
        perror("socket error:");
        exit(0);
    }
 
    bzero(&serveraddr, sizeof(serveraddr));
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_port = htons(atoi(argv[1]));
    serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
 
    bind(server_sockfd, (struct sockaddr*)&serveraddr, sizeof(serveraddr));
 
    listen(server_sockfd, 5);
 
        client_sockfd = accept(server_sockfd, (struct sockaddr*)&clientaddr, &client_len);
 
 
 
    return 0;
}