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01-05-2008, 08:27 AM
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 Non Blocking Connect/Select AIX 4.2+ I am having a problem with non blocking socket I/O on AIX. When Performing a connect on a socket that is marked as non blocking the call returns immediately with errno set to 55 EINPROGRESS. This is as per the manual, for connect which goes on to say the you can determine when connect completes by calling select on the socket to check for errors and write ability. The snag I have is that when I compile the code on AIX the select blocks as expected until the connection process completes or the timer expires. However if it comes back before the timer expires it is always with the flag for write set and no error flag even if the server you are trying to connect to rejects the connection, or if the SYN/ACK exchange times out. The linux manual page for connect (Fedora 3) says to select on write and to call getsockopt on SO_ERROR to find out if the connect succeeded. I tried that but I am getting no error even when the connect fails. Has anyone else seen this problem? -- J. David Rye http://www.roadrunner.uk.com http://www.rha.org.uk mailto://hostman@netman.road-runner.net      |
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01-05-2008, 08:27 AM
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| Re: Non Blocking Connect/Select AIX 4.2+ David Rye wrote: > > I am having a problem with non blocking socket I/O on AIX. > > When Performing a connect on a socket that is marked as non blocking the > call > returns immediately with errno set to 55 EINPROGRESS. > > This is as per the manual, for connect which goes on to say the you can > determine > when connect completes by calling select on the socket to check for > errors and > write ability. > > The snag I have is that when I compile the code on AIX the select blocks > as expected until the connection process completes or the timer expires. > > However if it comes back before the timer expires it is always with the > flag for > write set and no error flag even if the server you are trying to connect > to rejects the connection, or if the SYN/ACK exchange times out. > > The linux manual page for connect (Fedora 3) says to select on write and > to > call getsockopt on SO_ERROR to find out if the connect succeeded. > I tried that but I am getting no error even when the connect fails. > > Has anyone else seen this problem? > Scratch that. My typing. AIX apears to follow the LINUX manual page. Call connect, Call select just on write. Call getsockopt to find out the outcome. > -- > J. David Rye > http://www.roadrunner.uk.com > http://www.rha.org.uk > mailto://hostman@netman.road-runner.net -- J. David Rye http://www.roadrunner.uk.com http://www.rha.org.uk mailto://hostman@netman.road-runner.net |
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