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From: Gregory Bond <gnb@itga.com.au>
To: stable@freebsd.org
Subject: Re: Who's HUPing my daemon? 
In-reply-to: Your message of Fri, 01 Jun 2001 22:20:52 +1000.
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Date: Mon, 04 Jun 2001 14:03:42 +1000
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Thanks to all, especially Phil Homewood who explained what is happening.

Basically, init does the following
	fork()
	open /dev/console as STDIN/STDOUT/STDERR
	setsid()
	exec /etc/rc

and when the rc scrip ends, noone has /dev/console open so it is closed and 
all processes with this as the controlling terminal get SIGHUP'd.

The fix is to use the daemon() call to background and disassociate from the 
controlling terminal.  I have patched the bpalogin client and this fixes the 
problem, and I have sent a patch to the program maintainer.

Other options would include running bpalogin under nohup in the rc.d script
(cute, and works for programs without source code!) and using fork()+setsid()
rather than daemon() (for better portability to Linux/Solaris etc). 




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