Re: detecting logout
Re: detecting logout
- Subject: Re: detecting logout
- From: Graham J Lee <email@hidden>
- Date: Tue, 1 Feb 2005 20:16:57 +0000
On 1 Feb 2005, at 19:57, Pete Gontier wrote:
I am developing a per-user bootstrap daemon. This program used to be a
startup item, but for obscure reasons not relevant to the problem at
hand,
it became necessary to morph it into a per-user bootstrap daemon (and
not,
it should be noted, a global bootstrap daemon). The key difference
between
the two forms of program for purposes of this discussion is that a
startup
item launches once at startup and a per-user bootstrap daemon launches
whenever a user logs in. This means that there may be many instances
of a
single per-user bootstrap daemon, which is fine. The trick is knowing
when
each instance should quit. When the user logs out, per-user bootstrap
daemons are not automagically killed, which I suppose may be a feature
to
someone somewhere. For me, it presents a problem, because there is no
reason
for an instance of my program to hang around after the user logs out.
The
trick is knowing when that is.
Does the user's .logout script (or whatever alternative bash has) get
run when they log out of the console environment? If so, you launch
your daemon from .login, and cause it to write its pid into
~/.mydaemonname.pid, and then .logout contains the line "kill -QUIT
`cat ~/.mydaemonname.pid`".
Of course, if it doesn't get run, then you probably need to use a
logouthook. But that would make you a customer of the WindowServer,
which you don't want (understandably, because then users who ssh in
don't get to kill their daemons).
Just thinking out loud...my IDE is Mail.app and all that.
Cheers,
Graham.
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