Re: Re: about pppd termination?

[Paul Mackerras <paulus@samba.org>]

James Cameron writes:

> That reminds me.  In the pptpconfig GUI we must define a handler for
> SIGINT before starting pppd, because if we don't the SIGINT we send to
> pppd comes back to us because of "kill(0,sig)".  Why is this?  popen is
> used to activate pppd, so that output from pppd is redirected to GUI.

Because pppd does kill_my_pg when it gets a SIGTERM, SIGINT or SIGHUP
even if it hasn't detached, and it probably shouldn't.  Calling
kill_my_pg is the right thing to do if pppd has detached, because then
it has done a setsid.  But if it hasn't detached, then any signal sent
to the process group will get to any connector/disconnector processes
that are running anyway.  There does still remain the question of how
pppd gets any connector/disconnector processes to stop if pppd has to
terminate for other reasons, such as getting a SIGSEGV, though.

Paul.