在C网络中,使用select我首先必须listen()和accept()？

我正在尝试允许多个客户端使用SELEct连接到主机.我是否必须连接每个,告诉他们移动到另一个端口,然后重新连接新端口？或者会选择允许我将多个客户端连接到同一个端口？

这是客户端代码：

int rv;
int sockfd,numbytes;

if ((rv = getaddrinfo(hostName,hostPort,&hints,&servinfo)) != 0) {
    cout << "Could not get server address.\n";
    exit(1);
}

// loop through all the results and connect to the first we can
for(p = servinfo; p != NULL; p = p->ai_next) {
    if ((sockfd = socket(p->ai_family,p->ai_socktype,p->ai_protocol)) == -1) {
        perror("Client: no socket");
        conTinue;
    }

    if (connect(sockfd,p->ai_addr,p->ai_addrlen) == -1) {
        close(sockfd);
        perror("Client: connect");
        conTinue;
    }

    break;
}

if (p == NULL) {
    fprintf(stderr,"Unable to connect to server.\n");
    exit(2);
}

FD_SET(sockfd,&masterSet);

这是服务器代码：

int rv = getaddrinfo(NULL,port,&res);
    int yes = 1;//Not sure what this is for,found it in Beej's
    if(rv != 0){
            cout<< "Error,nothing matches criteria for file descriptor.\n";
            exit(1);
    }
    int fdInit;
    for(temp = res; temp != NULL; temp = temp->ai_next){
            if((fdInit = socket(temp->ai_family,temp->ai_socktype,temp->ai_protocol)) == -1){
                    cout << "This is not the fd you're looking for.  Move along.\n";
                    conTinue; //This is not the fd you're looking for,move along.
            }

            if(setsockopt(fdInit,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1){
                    cout << "Doom has fALLEN upon this set socket.\n";
                    perror("setsockopt");
                    exit(1); //Unable to set socket,exit program with code 1
            }

            if(bind(fdInit,temp->ai_addr,temp->ai_addrlen) == -1){
                    cout << "Could not bind fd\n";
                    close(fdInit);
                    conTinue; //Could not bind fd,conTinue looking for valid fd
            }
            break; //If a valid fd has been found,stop checking the list
    }
    if(temp==NULL){
            cout<<"Server Failed to bind a socket\n";
            exit(2);
    }

    cout << fdInit << endl;
    //Setup the file descriptor for initial connections on specified port
    freeaddrinfo(res);
    FD_SET(fdInit,&masterSet);

任何帮助都会很棒！谢谢.

fd_set fds;
int max = 0,reuse = 1;
struct timeval tv;
int server;
std::vector<int> connected;

// create server listening socket
server = socket(PF_INET,SOCK_STREAM,getprotobyname("tcp")->p_proto);
setsockopt(server,&reuse,sizeof(int)); // optional,but recommended
if (bind(server,(struct sockaddr *)&addr,sizeof(struct sockaddr_in)) < 0) {
    // error,Could not bind server socket
}
if (listen(server,8) < 0) {
    // error,Could not listen on server port
}

// loop looking for connections / data to handle
while (running) {
    FD_ZERO(&fds);
    FD_SET(server,&fds);
    if (server >= maX) max = server + 1;

    for (std::vector<int>::iterator it = connected.begin(); it != connected.end(); ++it) {
        FD_SET(*it,&fds);
        if (*it >= maX) max = *it + 1;
    }

    tv.tv_sec = 2; tv.tv_usec = 0;
    if (SELEct(max,&fds,NULL,&tv) > 0) {
        // something is readable
        if (FD_ISSET(server,&fds)) {
            // it's the listener
            connected.push_BACk(accept(server,(struct sockaddr *)&addr));
        }
        for (std::vector<int>::iterator it = connected.begin(); it != connected.end(); ++it) {
            if (FD_ISSET(*it,&fds)) {
                // handle data on this connection
            }
        }
    }
}