Question about using pid

[Joseph C. Lininger]

This works fine, but there is one problem. If something should happen to the
script that is running your process, the process may die two (this depends
on the system) and the process will definitely siece to be restarted
automatically. If it is absolutely critical that the process run, then you
need a solution that is run by init, and so will be restarted if it dies. An
alternative would be to simply put the process you want to run in to init,
but I recommend against this for two reasons. First, this pokes a security
hole in your system depending on what you are running. the other problem is
that processes can not be easily shut down while the system is running if
they are in the inittab file.
--
Joseph C. Lininger
jbahm at pcdesk.net
----- Original Message ----- 
From: "Luke Davis" <ldavis at shellworld.net>
To: <speakup at braille.uwo.ca>
Sent: Monday, October 20, 2003 3:16 PM
Subject: Re: Question about using pid


> The start-stop-daemon program, might help you with this.
>
> Any kind of do while, while, or similar loop, can do this, as the PID
> doesn't have to matter.  If you keep the process in the foreground, the
> shell's next command can not run until the command exits.  So, if you put
> it in a while loop, the shell's next command will be to restart the loop,
> thus rerunning the program, and achieving what you want.
>
> If you want to test for fail conditions, put an if test for $? after the
> command, with a break command to be executed if the program returns
> anything other than zero.
>
> Luke
>
>
>
>
> On Mon, 20 Oct 2003, Janina Sajka wrote:
>
> > I have a command that starts a process. Should that process die whilst
> > I'm not at my computer, I want a script to restart it.
> >
> > How do I do this? What doc might I read that would provide examples?
> >
> > I presume I should launch the process so that it's pid is written to a
> > file, and then I can just test for the running pid?
> >
> > But, I don't know how to go forward with this, so would appreciate all
> > advice and direction.
> >
> >
> >
>
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