使用select在客户端套接字上等待数据

我使用c在套接字之间进行通信.我的客户端连接到我的服务器很好.

socket_desc=socket(AF_INET,SOCK_STREAM,0);//create the socket descriptor
client->address.sin_addr.s_addr = inet_addr(ipAddress);
client->address.sin_family = AF_INET;
client->address.sin_port = htons(port);

bind(socket_desc,&address,sizeof(address));
connect(socket_desc,sizeof(address));

当我使用recv来阻止和监听数据时,一切正常：

int bytesRead = 1;
while(bytesRead){
    int bufsize=1024;        
    char *buffer=malloc(bufsize);
    bytesRead = recv(socket_desc,buffer,bufsize,0);
    printf("CLIENT RECV: %s",buffer);
}

如果我尝试使用select,它似乎不会读取任何数据.如果我将STDIN添加到fd_set,我可以强制它从套接字读取,但是select似乎没有从socket_desc中读取数据…？

int running = 1;
while(running){
    /* wait for something to happen on the socket */
    struct timeval selTimeout;
    selTimeout.tv_sec = 2;       /* timeout (secs.) */
    selTimeout.tv_usec = 0;            /* 0 microseconds */
    fd_set readSet;
    FD_ZERO(&readSet);
    FD_SET(STDIN_FILENO,&readSet);//stdin manually trigger reading
    FD_SET(socket_desc,&readSet);//tcp socket

    int numReady = select(3,&readSet,NULL,&selTimeout);
            //IT ONLY GETS PAST SELECT ON RETURN FROM THE KEYBOARD
    if(numReady > 0){
        char buffer[100] = {''};
        int bytesRead = read(socket_desc,&buffer,sizeof(buffer));
        printf("bytesRead %i : %s",bytesRead,buffer);
        if(bytesRead == 0){
            running = FALSE;
            printf("Shutdowning client.n");

        }
    }