http://www.nomorepasting.com/paste.php?pasteID=3846 select is allways returning SOCKET_ERROR, and then WSAGetLastError returns WSAENOTSOCK. What am I doing wrong?

90 nfds=ListeningSocket+1;
91 s = select(nfds, &conn, NULL, NULL, &timeout);

You had an errors at line 90.

nfds means that numbers of current selecting sockets + 1, so this value was set to 2.
ListeningSocket was socket descriptor value, no numbers of listeningsocket.

And notice follow.

One of the descriptor sets[&conn] contains an entry, that is not a socket.
For reason, select will returns SOCKET_ERROR, and WSAGetLastError returns WSAENOTSOCK.

As your codes, conn structures contains only listening socket information, then numbers of descriptor was 1 and nfds was must set to 2.
But nfds was ListenningSocket Descriptor value[maybe more over than 1, suppose this was 4] +1, so behind three descriptor information was gabage.

Forbidden my English, I am Korean.
[edited by - veruna2k on May 25, 2003 11:46:02 PM]

[edited by - veruna2k on May 26, 2003 1:56:39 AM]

[edited by - veruna2k on May 26, 2003 1:57:37 AM]

[edited by - veruna2k on May 26, 2003 1:59:08 AM]

[edited by - veruna2k on May 26, 2003 2:00:33 AM]

how should I solve it then?

already i posted up. look up

90 nfds=ListeningSocket+1;
91 s = select(nfds, &conn, NULL, NULL, &timeout);

ListeningSocket+1 is not,

nfds = numberOfListeningSocket // in your codes, this value was set to 1 // + 1;