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Patch: Implement 'gentle SIGHUP handling' (ITS#1679)

Full_Name: Hallvard B. Furuseth
Version: 2.1.0alpha
OS: Linux
URL: http://folk.uio.no/hbf/OpenLDAP/gentlehup.txt
Submission from: (NULL) (

Description from slapd.conf:

gentlehup { on | off }
    A SIGHUP signal will only cause a 'gentle' shutdown-attempt:  Slapd
    will stop listening for new connections, but will not close the
    connections to the current clients.  It terminates when all clients
    have closed their connections (if they ever do), or - as before -
    if it receives a SIGTERM signal.  This can be useful if you wish to
    terminate the server and start a new slapd server *with another
    database*, without disrupting the currently active clients.  The
    default is off.  You may wish to use idletimeout along with this

Implementation note:

slap_daemon.sd_nactives, which was unused, is now used to count the
number of connections and listeners to the slapd daemon.