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atHTTP hangs connections on select() errors


athttp often locks up resources and never frees them if select() returns an error.

A robust implementation of athttp will want to change the main cyg_httpd_daemon listen() loop so that cyg_httpd_close_unused_sockets(listener); is called regardless of the return value from the listen() call. Otherwise, errors from listen() will prevent all connections (possibly causing the errors) from ever timing out and being shut down. The system will quickly run out of sockets, as all will be left in the ESTABLISHED state. Not theoretical, fairly easy to get listen() to return errors.

Also see my post about athttp hanging in accept() when out of sockets if attempting a robust port.


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