在Linux上监听套接字连接而不接受调用

我在Ubuntu Linux上运行代码，它应该使用Set和select来检查侦听套接字何时有活动(即有人试图连接)并让他们连接，问题是选择ALLWAYS返回0，当我尝试连接时，它只是直接连接。但在服务器上接受从来没有被称为选择总是返回0，所以我想知道什么会导致这一点?

namespace SocketLib
{
const int MAX = FD_SETSIZE;
class SocketSet
{
public:
    SocketSet();
    void AddSocket( const Socket& p_sock );
    void RemoveSocket( const Socket& p_sock );
    inline int Poll( long p_time = 0 )
    {
        // this is the time value structure. It will determine how long
        // the select function will wait.
        struct timeval t = { 0, p_time * 1000 };
        // copy the set over into the activity set.
        m_activityset = m_set;
        // now run select() on the sockets.
        #ifdef WIN32
            return select( 0, &m_activityset, 0, 0, &t );
        #else
            if( m_socketdescs.size() == 0 ) return 0;
            return select( *(m_socketdescs.rbegin()), &m_activityset, 0, 0, &t );
        #endif
    }
    inline bool HasActivity( const Socket& p_sock )
    {
        return FD_ISSET( p_sock.GetSock(), &m_activityset ) != 0;
    }

protected:
    // a set representing the socket descriptors.
    fd_set m_set;
    // this set will represent all the sockets that have activity on them.
    fd_set m_activityset;
    // this is only used for linux, since select() requires the largest
    // descriptor +1 passed into it. BLAH!
    #ifndef WIN32
        std::set<sock> m_socketdescs;
    #endif
};

是运行投票的代码，如果它有帮助的话

附加代码为:

#include <algorithm>
#include "SocketSet.h"

namespace SocketLib
{
SocketSet::SocketSet()
{
    FD_ZERO( &m_set );
    FD_ZERO( &m_activityset );
}
void SocketSet::AddSocket( const Socket& p_sock )
{
    // add the socket desc to the set
    FD_SET( p_sock.GetSock(), &m_set );
    // if linux, then record the descriptor into the vector,
    // and check if it's the largest descriptor.
    #ifndef WIN32
        m_socketdescs.insert( p_sock.GetSock() );
    #endif
}
void SocketSet::RemoveSocket( const Socket& p_sock )
{
    FD_CLR( p_sock.GetSock(), &m_set );
    #ifndef WIN32
        // remove the descriptor from the vector
        m_socketdescs.erase( p_sock.GetSock() );
    #endif
}
}   // end namespace SocketSet

也在这里使用{//定义一个数据套接字，接收来自监听的连接//套接字DataSocket datasock;

    // detect if any sockets have action on them
    int i=m_set.Poll();
    if( i > 0 )
    {
        // loop through every listening socket
        for( size_t s = 0; s < m_sockets.size(); s++ )
        {
            // check to see if the current socket has a connection waiting
            if( m_set.HasActivity( m_sockets[s] ) )
            {
                try
                {
                    // accept the connection
                    datasock = m_sockets[s].Accept();
                    // run the action function on the new data socket
                    m_manager->NewConnection( datasock );
                    }

，它不会做一个。accept直到它从选择中获得活动之后，但它从来没有到那一步绑定和监听呼叫在这里模板无效ListeningManager::AddPort(port p_port){if(m_sockets.size() == MAX){异常(ESocketLimitReached);Throw (e);}

    // create a new socket
    ListeningSocket lsock;
    // listen on the requested port
    lsock.Listen( p_port );
    // make the socket non-blocking, so that it won't block if a
    // connection exploit is used when accepting (see Chapter 4)
    lsock.SetBlocking( false );
    // add the socket to the socket vector
    m_sockets.push_back( lsock );
    // add the socket descriptor to the set
    m_set.AddSocket( lsock );
}