_userproc()
application-level function, or
hook. The CSA library routines tell
_userproc()
whether it is being called as an Input Hook or an
Output Hook by passing it the flag
_O_REQUEST
and
_O_RESPONSE
respectively, so that the function knows what to do. Refer to the
$CSA_INSTALL/lib/csa-rpciolib.awk
file for an example of a dummy input/output hook.