Date: Sat, 25 Oct 1997 02:49:06 +0100 From: Brian Somers <brian@awfulhak.org> To: mike@NetworX.ie Cc: FreeBSD Support <questions@FreeBSD.ORG> Subject: Re: Executing a program after iijppp activates the link Message-ID: <199710250149.CAA27450@awfulhak.demon.co.uk> In-Reply-To: Your message of "Sat, 25 Oct 1997 01:39:01 -0000." <ECS9710250101A@NetworX.ie>
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> Hi all, > > I've just configured dial-on-demand user-mode ppp and it's excellent! > Works really well. > > I've got just one problem: the link will be going down and up > intermittently, as it's dial-on-demand and I've set an inactivity > timeout. > > Whenever the links becomes active again, I need to run an external > program. The "Pedantic PPP Primer" (http://www.freebsd.org/tutorials/ > ppp/ppp.html) and the manpage (ppp(1)) don't say how to do this. > > Looking at /etc/ppp/ppp.linkup.sample, the "pmdemand" entry has a > statement as follows: > ! sh -c "/some/program/or/other &" > This presumably executes the program in quotes (as the comments in the > file say it does). > > Now, what I'd really like to know is > (a) What are the exact syntax/symantics of this statement? if there are no args, $SHELL is run, otherwise ppp runs the given command. Either way, ppp wait(2)s for the program to finish (suspending its ability to transfer data). > (b) How does it differ from the "shell" command available from within > ppp's prompt? That is, could I also use > shell "/some/prog" > in my ppp.linkup entry? The latest ppp docs explain this stuff in greater detail (check out http://www.Awfulhak.org/ppp.html), but you're essentially right. In fact, ``!'' and ``shell'' are *exactly* the same thing :-) Be careful though, ppp wait(2)s for the command to finish. Newer versions of ppp have the "!bg" command for executing things in the background. > Thanks in advance for any help. > > > Bye, > Mike > <mike@NetworX.ie> > --- -- Brian <brian@Awfulhak.org>, <brian@FreeBSD.org>, <bri@OpenBSD.org> <http://www.Awfulhak.org>; Don't _EVER_ lose your sense of humour....
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