[ECOS] atHTTP hangs connections on select() errors

Tad Artis tad_artis@alum.mit.edu
Mon Jun 11 21:56:00 GMT 2007

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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