running out of descriptors

["Kurt D. Zeilenga" <Kurt@OpenLDAP.org>]

A number of folks have complained about slapd current session
close policy causes the server to run out of file descriptors.
Currently, we only close a session upon unbind request or
error  An inactive stream is not closed.

There are a number of reasonable approaches to resolving
this issue.

One approach is to implement an inactivity time and close
connections if and when the timer expires.  A patch (ITS#169)
a long these lines has already submitted.

Another approach would be enable TCP "keep-alives".

Multiple approaches could be developed (and committed).

Comments on these and other approaches.

Kurt