Nagios Support Forum

As of NSCA 2.6 up to NSCA CVS the nsca daemon is no longer running
successfully in single-process mode (--single option).
I discovered this during my recent upgrade to the Nagios 2.7.

The symptons have been described in earlier postings:
nsca responds to exactly one client request and stops responding
(while still running).
There is no solution execpt avoiding the --single mode and working
with --inetd or --daemon mode instead, or using NSCA 2.5.

I checked the source nsca.c and found a workaround:
Enable in the function "accept_connection" the following if statement
again:
/* REMOVED 04/03/2006 EG - already done in
wait_for_connections() */
/*
if(mode==SINGLE_PROCESS_DAEMON)
register_read_handler(sock,accept_connection,NULL);
*/
The real problem seems to lie in the way pfds.events is maintained.
handle_events() clears it ( pfds.events&=~POLLIN; ) and
register_poll() sets it again in NSCA 2.5 because
register_read_handler is called which in turn calls register_poll().
NSCA 2.7 does not call register_poll() and hence the fd is removed as
events=0 (done at the end of handle_events().

Could someone familiar with the code please have a look and check
the root cause of the problem.
I would be willing to work on a patch.

Thanks,

Rudolf VanderLeeden
Sysadmin
Logic United GmbH
Germany
[email protected]








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