Ejemplo n.º 1
0
    bool MessagingPort::connect(SockAddr& _far)
    {
        farEnd = _far;

        sock = socket(AF_INET, SOCK_STREAM, 0);
        if ( sock == INVALID_SOCKET ) {
            log() << "ERROR: connect(): invalid socket? " << OUTPUT_ERRNO << endl;
            return false;
        }

#if 0
        long fl = fcntl(sock, F_GETFL, 0);
        assert( fl >= 0 );
        fl |= O_NONBLOCK;
        fcntl(sock, F_SETFL, fl);

        int res = ::connect(sock, (sockaddr *) &farEnd.sa, farEnd.addressSize);
        if ( res ) {
            if ( errno == EINPROGRESS )
                closesocket(sock);
            sock = -1;
            return false;
        }

#endif

        ConnectBG bg;
        bg.sock = sock;
        bg.farEnd = farEnd;
        bg.go();

        // int res = ::connect(sock, (sockaddr *) &farEnd.sa, farEnd.addressSize);
        if ( bg.wait(5000) ) {
            if ( bg.res ) {
                closesocket(sock);
                sock = -1;
                return false;
            }
        }
        else {
            // time out the connect
            closesocket(sock);
            sock = -1;
            bg.wait(); // so bg stays in scope until bg thread terminates
            return false;
        }

        disableNagle(sock);

#ifdef SO_NOSIGPIPE
        // osx
        const int one = 1;
        setsockopt(sock, SOL_SOCKET, SO_NOSIGPIPE, &one, sizeof(int));
#endif

        return true;
    }
Ejemplo n.º 2
0
    bool Socket::connect(SockAddr& remote) {
        _remote = remote;

        _fd = socket(remote.getType(), SOCK_STREAM, 0);
        if ( _fd == INVALID_SOCKET ) {
            LOG(_logLevel) << "ERROR: connect invalid socket " << errnoWithDescription() << endl;
            return false;
        }

        if ( _timeout > 0 ) {
            setTimeout( _timeout );
        }

        static const unsigned int connectTimeoutMillis = 5000;
        ConnectBG bg(_fd, remote);
        bg.go();
        if ( bg.wait(connectTimeoutMillis) ) {
            if ( bg.inError() ) {
                warning() << "Failed to connect to "
                          << _remote.getAddr() << ":" << _remote.getPort()
                          << ", reason: " << bg.getErrnoWithDescription() << endl;
                close();
                return false;
            }
        }
        else {
            // time out the connect
            close();
            bg.wait(); // so bg stays in scope until bg thread terminates
            warning() << "Failed to connect to "
                      << _remote.getAddr() << ":" << _remote.getPort()
                      << " after " << connectTimeoutMillis << " milliseconds, giving up." << endl;
            return false;
        }

        if (remote.getType() != AF_UNIX)
            disableNagle(_fd);

#ifdef SO_NOSIGPIPE
        // ignore SIGPIPE signals on osx, to avoid process exit
        const int one = 1;
        setsockopt( _fd , SOL_SOCKET, SO_NOSIGPIPE, &one, sizeof(int));
#endif

        _local = getLocalAddrForBoundSocketFd(_fd);

        _fdCreationMicroSec = curTimeMicros64();

        _awaitingHandshake = false;

        return true;
    }
Ejemplo n.º 3
0
 void Listener::listen() {
     SockAddr from;
     while ( 1 ) {
         int s = accept(sock, (sockaddr *) &from.sa, &from.addressSize);
         if ( s < 0 ) {
             if ( errno == ECONNABORTED || errno == EBADF ) {
                 log() << "Listener on port " << port << " aborted" << endl;
                 return;
             }
             log() << "Listener: accept() returns " << s << " errno:" << errno << ", strerror: " << strerror( errno ) << endl;
             continue;
         }
         disableNagle(s);
         log() << "connection accepted from " << from.toString() << endl;
         accepted( new MessagingPort(s, from) );
     }
 }
Ejemplo n.º 4
0
 void Listener::listen() {
     static long connNumber = 0;
     SockAddr from;
     while ( ! inShutdown() ) {
         int s = accept(sock, (sockaddr *) &from.sa, &from.addressSize);
         if ( s < 0 ) {
             if ( errno == ECONNABORTED || errno == EBADF ) {
                 log() << "Listener on port " << port << " aborted" << endl;
                 return;
             }
             log() << "Listener: accept() returns " << s << " " << OUTPUT_ERRNO << endl;
             continue;
         }
         disableNagle(s);
         if ( ! cmdLine.quiet ) log() << "connection accepted from " << from.toString() << " #" << ++connNumber << endl;
         accepted( new MessagingPort(s, from) );
     }
 }
Ejemplo n.º 5
0
 void MiniWebServer::run() {
     SockAddr from;
     while ( 1 ) {
         int s = accept(sock, from.getSockAddr(), &from.addressSize);
         if ( s < 0 ) {
             if ( errno == ECONNABORTED ) {
                 log() << "Listener on port " << port << " aborted." << endl;
                 return;
             }
             log() << "MiniWebServer: accept() returns " << s << " errno:" << errno << endl;
             sleepmillis(200);
             continue;
         }
         disableNagle(s);
         RARELY log() << "MiniWebServer: connection accepted from " << from.toString() << endl;
         accepted( s, from );
         closesocket(s);
     }
 }
Ejemplo n.º 6
0
bool Socket::connect(SockAddr& remote) {
    _remote = remote;

    _fd = socket(remote.getType(), SOCK_STREAM, 0);
    if ( _fd == INVALID_SOCKET ) {
        LOG(_logLevel) << "ERROR: connect invalid socket " << errnoWithDescription() << endl;
        return false;
    }

    if ( _timeout > 0 ) {
        setTimeout( _timeout );
    }

    ConnectBG bg(_fd, remote);
    bg.go();
    if ( bg.wait(5000) ) {
        if ( bg.inError() ) {
            close();
            return false;
        }
    }
    else {
        // time out the connect
        close();
        bg.wait(); // so bg stays in scope until bg thread terminates
        return false;
    }

    if (remote.getType() != AF_UNIX)
        disableNagle(_fd);

#ifdef SO_NOSIGPIPE
    // ignore SIGPIPE signals on osx, to avoid process exit
    const int one = 1;
    setsockopt( _fd , SOL_SOCKET, SO_NOSIGPIPE, &one, sizeof(int));
#endif

    _local = getLocalAddrForBoundSocketFd(_fd);

    _fdCreationMicroSec = curTimeMicros64();
    return true;
}
Ejemplo n.º 7
0
    bool Socket::connect(SockAddr& remote) {
        _remote = remote;

        _fd = socket(remote.getType(), SOCK_STREAM, 0);
        if ( _fd == INVALID_SOCKET ) {
            log(_logLevel) << "ERROR: connect invalid socket " << errnoWithDescription() << endl;
            return false;
        }

        if ( _timeout > 0 ) {
            setSockTimeouts( _fd, _timeout );
        }

        ConnectBG bg(_fd, remote);
        bg.go();
        if ( bg.wait(5000) ) {
            if ( bg.inError() ) {
                close();
                return false;
            }
        }
        else {
            // time out the connect
            close();
            bg.wait(); // so bg stays in scope until bg thread terminates
            return false;
        }

        if (remote.getType() != AF_UNIX)
            disableNagle(_fd);

#ifdef SO_NOSIGPIPE
        // osx
        const int one = 1;
        setsockopt( _fd , SOL_SOCKET, SO_NOSIGPIPE, &one, sizeof(int));
#endif

        return true;
    }
Ejemplo n.º 8
0
    void Listener::initAndListen() {
        vector<SockAddr> mine = ipToAddrs(_ip.c_str(), _port);
        vector<int> socks;
        SOCKET maxfd = 0; // needed for select()

        for (vector<SockAddr>::iterator it=mine.begin(), end=mine.end(); it != end; ++it){
            SockAddr& me = *it;

            SOCKET sock = ::socket(me.getType(), SOCK_STREAM, 0);
            if ( sock == INVALID_SOCKET ) {
                log() << "ERROR: listen(): invalid socket? " << errnoWithDescription() << endl;
            }

            if (me.getType() == AF_UNIX){
#if !defined(_WIN32)
                if (unlink(me.getAddr().c_str()) == -1){
                    int x = errno;
                    if (x != ENOENT){
                        log() << "couldn't unlink socket file " << me << errnoWithDescription(x) << " skipping" << endl;
                        continue;
                    }
                }
#endif
            } else if (me.getType() == AF_INET6) {
                // IPv6 can also accept IPv4 connections as mapped addresses (::ffff:127.0.0.1)
                // That causes a conflict if we don't do set it to IPV6_ONLY
                const int one = 1;
                setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (const char*) &one, sizeof(one));
            }

            prebindOptions( sock );
            
            if ( ::bind(sock, me.raw(), me.addressSize) != 0 ) {
                int x = errno;
                log() << "listen(): bind() failed " << errnoWithDescription(x) << " for socket: " << me.toString() << endl;
                if ( x == EADDRINUSE )
                    log() << "  addr already in use" << endl;
                closesocket(sock);
                return;
            }

            if ( ::listen(sock, 128) != 0 ) {
                log() << "listen(): listen() failed " << errnoWithDescription() << endl;
                closesocket(sock);
                return;
            }

            ListeningSockets::get()->add( sock );

            socks.push_back(sock);
            if (sock > maxfd)
                maxfd = sock;
        }

        static long connNumber = 0;
        struct timeval maxSelectTime;
        while ( ! inShutdown() ) {
            fd_set fds[1];
            FD_ZERO(fds);

            for (vector<int>::iterator it=socks.begin(), end=socks.end(); it != end; ++it){
                FD_SET(*it, fds);
            }

            maxSelectTime.tv_sec = 0;
            maxSelectTime.tv_usec = 10000;
            const int ret = select(maxfd+1, fds, NULL, NULL, &maxSelectTime);
            
            if (ret == 0){
                _elapsedTime += maxSelectTime.tv_usec / 1000;
                continue;
            }
            _elapsedTime += ret; // assume 1ms to grab connection. very rough
            
            if (ret < 0){
                int x = errno;
#ifdef EINTR
                if ( x == EINTR ){
                    log() << "select() signal caught, continuing" << endl;
                    continue;
                }
#endif
                if ( ! inShutdown() )
                    log() << "select() failure: ret=" << ret << " " << errnoWithDescription(x) << endl;
                return;
            }

            for (vector<int>::iterator it=socks.begin(), end=socks.end(); it != end; ++it){
                if (! (FD_ISSET(*it, fds)))
                    continue;

                SockAddr from;
                int s = accept(*it, from.raw(), &from.addressSize);
                if ( s < 0 ) {
                    int x = errno; // so no global issues
                    if ( x == ECONNABORTED || x == EBADF ) {
                        log() << "Listener on port " << _port << " aborted" << endl;
                        return;
                    } if ( x == 0 && inShutdown() ){
                        return;   // socket closed
                    }
                    log() << "Listener: accept() returns " << s << " " << errnoWithDescription(x) << endl;
                    continue;
                } 
                if (from.getType() != AF_UNIX)
                    disableNagle(s);
                if ( _logConnect && ! cmdLine.quiet ) 
                    log() << "connection accepted from " << from.toString() << " #" << ++connNumber << endl;
                accepted(s, from);
            }
        }
    }
Ejemplo n.º 9
0
    void Listener::initAndListen() {
        checkTicketNumbers();
        vector<SOCKET> socks;
        set<int> sslSocks;
        
        { // normal sockets
            vector<SockAddr> mine = ipToAddrs(_ip.c_str(), _port, (!cmdLine.noUnixSocket && useUnixSockets()));
            if ( ! _setupSockets( mine , socks ) )
                return;
        }
        
#ifdef MONGO_SSL
        if ( _ssl && _sslPort > 0 ) {
            unsigned prev = socks.size();
            
            vector<SockAddr> mine = ipToAddrs(_ip.c_str(), _sslPort, false );
            if ( ! _setupSockets( mine , socks ) )
                return;
            
            for ( unsigned i=prev; i<socks.size(); i++ ) {
                sslSocks.insert( socks[i] );
            }

        }
#endif

        SOCKET maxfd = 0; // needed for select()
        for ( unsigned i=0; i<socks.size(); i++ ) {
            if ( socks[i] > maxfd )
                maxfd = socks[i];
        }
        
#ifdef MONGO_SSL
        if ( _ssl == 0 ) {
            _logListen( _port , false );
        }
        else if ( _sslPort == 0 ) {
            _logListen( _port , true );
        }
        else {
            // both
            _logListen( _port , false );
            _logListen( _sslPort , true );
        }
#else
        _logListen( _port , false );
#endif

        static long connNumber = 0;
        struct timeval maxSelectTime;
        while ( ! inShutdown() ) {
            fd_set fds[1];
            FD_ZERO(fds);
            
            for (vector<SOCKET>::iterator it=socks.begin(), end=socks.end(); it != end; ++it) {
                FD_SET(*it, fds);
            }

            maxSelectTime.tv_sec = 0;
            maxSelectTime.tv_usec = 10000;
            const int ret = select(maxfd+1, fds, NULL, NULL, &maxSelectTime);

            if (ret == 0) {
#if defined(__linux__)
                _elapsedTime += ( 10000 - maxSelectTime.tv_usec ) / 1000;
#else
                _elapsedTime += 10;
#endif
                continue;
            }

            if (ret < 0) {
                int x = errno;
#ifdef EINTR
                if ( x == EINTR ) {
                    log() << "select() signal caught, continuing" << endl;
                    continue;
                }
#endif
                if ( ! inShutdown() )
                    log() << "select() failure: ret=" << ret << " " << errnoWithDescription(x) << endl;
                return;
            }

#if defined(__linux__)
            _elapsedTime += max(ret, (int)(( 10000 - maxSelectTime.tv_usec ) / 1000));
#else
            _elapsedTime += ret; // assume 1ms to grab connection. very rough
#endif

            for (vector<SOCKET>::iterator it=socks.begin(), end=socks.end(); it != end; ++it) {
                if (! (FD_ISSET(*it, fds)))
                    continue;

                SockAddr from;
                int s = accept(*it, from.raw(), &from.addressSize);
                if ( s < 0 ) {
                    int x = errno; // so no global issues
                    if ( x == ECONNABORTED || x == EBADF ) {
                        log() << "Listener on port " << _port << " aborted" << endl;
                        return;
                    }
                    if ( x == 0 && inShutdown() ) {
                        return;   // socket closed
                    }
                    if( !inShutdown() ) {
                        log() << "Listener: accept() returns " << s << " " << errnoWithDescription(x) << endl;
                        if (x == EMFILE || x == ENFILE) {
                            // Connection still in listen queue but we can't accept it yet
                            error() << "Out of file descriptors. Waiting one second before trying to accept more connections." << warnings;
                            sleepsecs(1);
                        }
                    }
                    continue;
                }
                if (from.getType() != AF_UNIX)
                    disableNagle(s);

#ifdef SO_NOSIGPIPE
                // ignore SIGPIPE signals on osx, to avoid process exit
                const int one = 1;
                setsockopt( s , SOL_SOCKET, SO_NOSIGPIPE, &one, sizeof(int));
#endif

                if ( _logConnect && ! cmdLine.quiet ){
                    int conns = connTicketHolder.used()+1;
                    const char* word = (conns == 1 ? " connection" : " connections");
                    log() << "connection accepted from " << from.toString() << " #" << ++connNumber << " (" << conns << word << " now open)" << endl;
                }
                
                boost::shared_ptr<Socket> pnewSock( new Socket(s, from) );
#ifdef MONGO_SSL
                if ( _ssl && ( _sslPort == 0 || sslSocks.count(*it) ) ) {
                    pnewSock->secureAccepted( _ssl );
                }
#endif
                accepted( pnewSock );
            }
        }
    }
Ejemplo n.º 10
0
bool Socket::connect(SockAddr& remote) {
    _remote = remote;

    _fd = ::socket(remote.getType(), SOCK_STREAM, 0);
    if (_fd == INVALID_SOCKET) {
        networkWarnWithDescription(*this, "socket");
        return false;
    }

    if (!setBlock(_fd, false)) {
        networkWarnWithDescription(*this, "set socket to non-blocking mode");
        return false;
    }

    const Milliseconds connectTimeoutMillis(static_cast<int64_t>(
        _timeout > 0 ? std::min(kMaxConnectTimeoutMS, (_timeout * 1000)) : kMaxConnectTimeoutMS));
    const Date_t expiration = Date_t::now() + connectTimeoutMillis;

    bool connectSucceeded = ::connect(_fd, _remote.raw(), _remote.addressSize) == 0;

    if (!connectSucceeded) {
#ifdef _WIN32
        if (WSAGetLastError() != WSAEWOULDBLOCK) {
            networkWarnWithDescription(*this, "connect");
            return false;
        }
#else
        if (errno != EINTR && errno != EINPROGRESS) {
            networkWarnWithDescription(*this, "connect");
            return false;
        }
#endif

        pollfd pfd;
        pfd.fd = _fd;
        pfd.events = POLLOUT;

        while (true) {
            const auto timeout = std::max(Milliseconds(0), expiration - Date_t::now());

            int pollReturn = socketPoll(&pfd, 1, timeout.count());
#ifdef _WIN32
            if (pollReturn == SOCKET_ERROR) {
                networkWarnWithDescription(*this, "poll");
                return false;
            }
#else
            if (pollReturn == -1) {
                if (errno != EINTR) {
                    networkWarnWithDescription(*this, "poll");
                    return false;
                }

                // EINTR in poll, try again
                continue;
            }
#endif
            // No activity for the full duration of the timeout.
            if (pollReturn == 0) {
                warning() << "Failed to connect to " << _remote.getAddr() << ":"
                          << _remote.getPort() << " after " << connectTimeoutMillis
                          << " milliseconds, giving up.";
                return false;
            }

            // We had a result, see if there's an error on the socket.
            int optVal;
            socklen_t optLen = sizeof(optVal);
            if (::getsockopt(
                    _fd, SOL_SOCKET, SO_ERROR, reinterpret_cast<char*>(&optVal), &optLen) == -1) {
                networkWarnWithDescription(*this, "getsockopt");
                return false;
            }
            if (optVal != 0) {
                networkWarnWithDescription(*this, "checking socket for error after poll", optVal);
                return false;
            }

            // We had activity and we don't have errors on the socket, we're connected.
            break;
        }
    }

    if (!setBlock(_fd, true)) {
        networkWarnWithDescription(*this, "could not set socket to blocking mode");
        return false;
    }

    if (_timeout > 0) {
        setTimeout(_timeout);
    }

    if (remote.getType() != AF_UNIX)
        disableNagle(_fd);

#ifdef SO_NOSIGPIPE
    // ignore SIGPIPE signals on osx, to avoid process exit
    const int one = 1;
    setsockopt(_fd, SOL_SOCKET, SO_NOSIGPIPE, &one, sizeof(int));
#endif

    _local = getLocalAddrForBoundSocketFd(_fd);

    _fdCreationMicroSec = curTimeMicros64();

    _awaitingHandshake = false;

    return true;
}
Ejemplo n.º 11
0
    void Listener::initAndListen() {
        if (!_setupSocketsSuccessful) {
            return;
        }

#ifdef MONGO_SSL
        _logListen(_port, _ssl);
#else
        _logListen(_port, false);
#endif
                
        OwnedPointerVector<EventHolder> eventHolders;
        boost::scoped_array<WSAEVENT> events(new WSAEVENT[_socks.size()]);
        
        
        // Populate events array with an event for each socket we are watching
        for (size_t count = 0; count < _socks.size(); ++count) {
            EventHolder* ev(new EventHolder);
            eventHolders.mutableVector().push_back(ev);
            events[count] = ev->get();            
        }
            
        while ( ! inShutdown() ) {
            // Turn on listening for accept-ready sockets
            for (size_t count = 0; count < _socks.size(); ++count) {
                int status = WSAEventSelect(_socks[count], events[count], FD_ACCEPT | FD_CLOSE);
                if (status == SOCKET_ERROR) {
                    const int mongo_errno = WSAGetLastError();

                    // During shutdown, we may fail to listen on the socket if it has already
                    // been closed
                    if (inShutdown()) {
                        return;
                    }

                    error() << "Windows WSAEventSelect returned "
                        << errnoWithDescription(mongo_errno) << endl;
                    fassertFailed(16727);
                }
            }
        
            // Wait till one of them goes active, or we time out
            DWORD result = WSAWaitForMultipleEvents(_socks.size(),
                                                    events.get(), 
                                                    FALSE, // don't wait for all the events
                                                    10, // timeout, in ms 
                                                    FALSE); // do not allow I/O interruptions
            if (result == WSA_WAIT_FAILED) {
                const int mongo_errno = WSAGetLastError();
                error() << "Windows WSAWaitForMultipleEvents returned " 
                    << errnoWithDescription(mongo_errno) << endl;
                fassertFailed(16723);
            }
        
            if (result == WSA_WAIT_TIMEOUT) {
                _elapsedTime += 10;
                continue;
            }
            _elapsedTime += 1; // assume 1ms to grab connection. very rough
            
            // Determine which socket is ready
            DWORD eventIndex = result - WSA_WAIT_EVENT_0;
            WSANETWORKEVENTS networkEvents;            
            // Extract event details, and clear event for next pass
            int status = WSAEnumNetworkEvents(_socks[eventIndex],
                                              events[eventIndex], 
                                              &networkEvents);
            if (status == SOCKET_ERROR) {
                const int mongo_errno = WSAGetLastError();
                error() << "Windows WSAEnumNetworkEvents returned " 
                    << errnoWithDescription(mongo_errno) << endl;
                continue;
            }
            
            if (networkEvents.lNetworkEvents & FD_CLOSE) {              
                log() << "listen socket closed" << endl;
                break;
            }
            
            if (!(networkEvents.lNetworkEvents & FD_ACCEPT)) {
                error() << "Unexpected network event: " << networkEvents.lNetworkEvents << endl;
                continue;
            }
            
            int iec = networkEvents.iErrorCode[FD_ACCEPT_BIT];
            if (iec != 0) {                 
                error() << "Windows socket accept did not work:" << errnoWithDescription(iec) 
                        << endl;
                continue;
            }
            
            status = WSAEventSelect(_socks[eventIndex], NULL, 0);
            if (status == SOCKET_ERROR) {
                const int mongo_errno = WSAGetLastError();
                error() << "Windows WSAEventSelect returned " 
                    << errnoWithDescription(mongo_errno) << endl;
                continue;
            }
            
            disableNonblockingMode(_socks[eventIndex]);
            
            SockAddr from;
            int s = accept(_socks[eventIndex], from.raw(), &from.addressSize);
            if ( s < 0 ) {
                int x = errno; // so no global issues
                if (x == EBADF) {
                    log() << "Port " << _port << " is no longer valid" << endl;
                    continue;
                }
                else if (x == ECONNABORTED) {
                    log() << "Listener on port " << _port << " aborted" << endl;
                    continue;
                }
                if ( x == 0 && inShutdown() ) {
                    return;   // socket closed
                }
                if( !inShutdown() ) {
                    log() << "Listener: accept() returns " << s << " " 
                        << errnoWithDescription(x) << endl;
                    if (x == EMFILE || x == ENFILE) {
                        // Connection still in listen queue but we can't accept it yet
                        error() << "Out of file descriptors. Waiting one second before"
                            " trying to accept more connections." << warnings;
                        sleepsecs(1);
                    }
                }
                continue;
            }
            if (from.getType() != AF_UNIX)
                disableNagle(s);

            long long myConnectionNumber = globalConnectionNumber.addAndFetch(1);

            if (_logConnect && !serverGlobalParams.quiet) {
                int conns = globalTicketHolder.used()+1;
                const char* word = (conns == 1 ? " connection" : " connections");
                log() << "connection accepted from " << from.toString() << " #" << myConnectionNumber << " (" << conns << word << " now open)" << endl;
            }
            
            boost::shared_ptr<Socket> pnewSock( new Socket(s, from) );
#ifdef MONGO_SSL
            if (_ssl) {
                pnewSock->secureAccepted(_ssl);
            }
#endif
            accepted( pnewSock , myConnectionNumber );
        }
    }
Ejemplo n.º 12
0
    void Listener::initAndListen() {
        if (!_setupSocketsSuccessful) {
            return;
        }

        SOCKET maxfd = 0; // needed for select()
        for (unsigned i = 0; i < _socks.size(); i++) {
            if (_socks[i] > maxfd)
                maxfd = _socks[i];
        }

        if ( maxfd >= FD_SETSIZE ) {
            error() << "socket " << maxfd << " is higher than " << FD_SETSIZE-1 << 
                "; not supported" << warnings;
            return;
        }

#ifdef MONGO_SSL
        _logListen(_port, _ssl);
#else
        _logListen(_port, false);
#endif

        struct timeval maxSelectTime;
        while ( ! inShutdown() ) {
            fd_set fds[1];
            FD_ZERO(fds);
            
            for (vector<SOCKET>::iterator it=_socks.begin(), end=_socks.end(); it != end; ++it) {
                FD_SET(*it, fds);
            }

            maxSelectTime.tv_sec = 0;
            maxSelectTime.tv_usec = 10000;
            const int ret = select(maxfd+1, fds, NULL, NULL, &maxSelectTime);

            if (ret == 0) {
#if defined(__linux__)
                _elapsedTime += ( 10000 - maxSelectTime.tv_usec ) / 1000;
#else
                _elapsedTime += 10;
#endif
                continue;
            }

            if (ret < 0) {
                int x = errno;
#ifdef EINTR
                if ( x == EINTR ) {
                    log() << "select() signal caught, continuing" << endl;
                    continue;
                }
#endif
                if ( ! inShutdown() )
                    log() << "select() failure: ret=" << ret << " " << errnoWithDescription(x) << endl;
                return;
            }

#if defined(__linux__)
            _elapsedTime += max(ret, (int)(( 10000 - maxSelectTime.tv_usec ) / 1000));
#else
            _elapsedTime += ret; // assume 1ms to grab connection. very rough
#endif

            for (vector<SOCKET>::iterator it=_socks.begin(), end=_socks.end(); it != end; ++it) {
                if (! (FD_ISSET(*it, fds)))
                    continue;
                SockAddr from;
                int s = accept(*it, from.raw(), &from.addressSize);
                if ( s < 0 ) {
                    int x = errno; // so no global issues
                    if (x == EBADF) {
                        log() << "Port " << _port << " is no longer valid" << endl;
                        return;
                    }
                    else if (x == ECONNABORTED) {
                        log() << "Connection on port " << _port << " aborted" << endl;
                        continue;
                    }
                    if ( x == 0 && inShutdown() ) {
                        return;   // socket closed
                    }
                    if( !inShutdown() ) {
                        log() << "Listener: accept() returns " << s << " " << errnoWithDescription(x) << endl;
                        if (x == EMFILE || x == ENFILE) {
                            // Connection still in listen queue but we can't accept it yet
                            error() << "Out of file descriptors. Waiting one second before trying to accept more connections." << warnings;
                            sleepsecs(1);
                        }
                    }
                    continue;
                }
                if (from.getType() != AF_UNIX)
                    disableNagle(s);

#ifdef SO_NOSIGPIPE
                // ignore SIGPIPE signals on osx, to avoid process exit
                const int one = 1;
                setsockopt( s , SOL_SOCKET, SO_NOSIGPIPE, &one, sizeof(int));
#endif

                long long myConnectionNumber = globalConnectionNumber.addAndFetch(1);

                if (_logConnect && !serverGlobalParams.quiet) {
                    int conns = globalTicketHolder.used()+1;
                    const char* word = (conns == 1 ? " connection" : " connections");
                    log() << "connection accepted from " << from.toString() << " #" << myConnectionNumber << " (" << conns << word << " now open)" << endl;
                }
                
                boost::shared_ptr<Socket> pnewSock( new Socket(s, from) );
#ifdef MONGO_SSL
                if (_ssl) {
                    pnewSock->secureAccepted(_ssl);
                }
#endif
                accepted( pnewSock , myConnectionNumber );
            }
        }
    }