Select with nonblocking connects

Corinna Vinschen
Fri Jul 5 11:30:00 GMT 2002

On Fri, Jul 05, 2002 at 03:52:21PM +0200, Corinna Vinschen wrote:
> On Fri, Jul 05, 2002 at 03:20:19PM +0200, Thomas Pfaff wrote:
> > 
> > I guess the easiest way is to add a flag in fhandler_socket that is set
> > when a connect is in progress. If it is set then add the sock handle to
> > exceptfds as well. After select returns check the exceptfds, if the socket
> > is signaled set it in writefds too. In UNIX you have to check the SO_ERROR
> > sockopt to know if the connect has succeded or failed, but winsock sets is as
> > well. Now clear the in_progress flag.
> > 
> > For listening sockets i see no difference.
> Huh?  The problem is the same as long as neither connect() nor listen()
> have been called, nor a non-blocking connect() has succeeded.  In either
> case, the WinSock select() blocks if the SOCKET is given in write_fd,
> while the Linux select() returns with the fd set in write_fd.
> The difference is just the SO_ERROR value which is 0 as long as neither
> connect() nor listen() have been called, resp EINPROGRESS in case of a
> not finshed connect().
> I'm not talking about a listening socket.  I'm talking about a socket in
> neither listening nor connected state.

I've checked in a patch.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                      
Red Hat, Inc.

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