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Non-blocking connect()?

Started by peter_b Sep 15, 2006 at 3:39 AM 2 replies 1.7k views

Original Post

Sep 15, 2006 at 3:39 AM

Hello. Is there anything i can do to know when a non-blocking connect finishes? I need to know when the connection is accepted or if it times out. Im using berkely socket functions only, not winsock asyncronus functions. So i guess there must be a way to poll the socket with select() or something. But how do i know if the connection was accepted, timedout, or rejected? Thanks in advance.

TUna

Sep 15, 2006 at 3:57 AM

Use "select" to determine if the socket is write ready or in an error state.

taby

Sep 17, 2006 at 5:09 PM

This source code has a tcp_client::Connect class that performs non-blocking connect() through ioctlsocket() by manually breaking down the connect timeout period into 250ms slices:

http://cwiki.org/index.php/Winsock_TCP_Client-Server_Library

zppz

Sep 21, 2006 at 11:51 PM

It's also possible to use non-blocking sockets. Just keep calling connect() and handle the errors appropriately:
The first call will probably return WOULDBLOCK or INPROGRESS which is fine, after that you will get INVAL or ALREADY which can be ignored. When the connection succeeds you will get ISCONN, then you can stop calling connect() and start using the socket.

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