Date: Tue, 23 Mar 1999 21:54:52 +1000 From: Greg Black <gjb@comkey.com.au> To: cjclark@home.com Cc: freebsd-questions@FreeBSD.ORG (FreeBSD Questions) Subject: Re: Process Checking Message-ID: <19990323115452.12503.qmail@alpha.comkey.com.au> In-Reply-To: <199903230637.BAA10035@cc942873-a.ewndsr1.nj.home.com> of Tue, 23 Mar 1999 01:37:19 EST References: <199903230637.BAA10035@cc942873-a.ewndsr1.nj.home.com>
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> Is there a more reliable and graceful way to check if a process,
> identified by pid, is still alive?
The standard way to do this from a shell script is:
kill -0 $pid || restart_daemon
There's a small risk that the pid has been re-cycled and is in
use by some other process, but that's a race that you have to
manage in any other solution anyway. Obviously, there's also a
trivial C idiom for this, but I think you wanted something for a
script.
There are much better methods if you have source to the flaky
daemon, but I'll leave them as an exercise with the atexit(3) or
flock(2) man pages.
--
Greg Black <gjb@acm.org>
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