c++ - 如何找出套接字在C++中有数据

Question

我编写了以下函数并且运行良好:

bool NetworkSocket::isSocketReady()
{

    /// Got here because iSelectReturn > 0 thus data available on at least one descriptor
    // Is our socket in the return list of readable sockets
    bool             res;
    fd_set          sready;
    struct timeval  nowait;

    FD_ZERO(&sready);
    FD_SET((unsigned int)this->socketFD,&sready);
    //bzero((char *)&nowait,sizeof(nowait));
    memset((char *)&nowait,0,sizeof(nowait));

    res = select(this->socketFD+1,&sready,NULL,NULL,&nowait);
    if( FD_ISSET(this->socketFD,&sready) )
        res = true;
    else
        res = false;


    return res;

}

上面的函数当socket准备好工作时返回true，你知道我测试socket是否有数据我如何测试它吗？

Answer 1

when socket is ready for work return true

没有。当 read() 可以在没有 EWOULDBLOCK/EAGAIN 的情况下执行时返回 true，即如果有东西可以立即读取而不会阻塞。

Do you have any idea if i test socket has data

你已经找到了。