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Date: Tue, 17 May 2005 10:27:56 +0100
From: Tim Stephens <mail@tjstephens.com>
To: Gowtham <ic.gowtham@gmail.com>
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Subject: Re: Daemon Process
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On Tue, May 17, 2005 at 01:57:28PM +0530, Gowtham wrote:
> Hi All,
> Thank you very much for the feedback. Now, suppose I want to write a daemon 
> for Unix in C whose job is to monitor other daemons and restart dead 
> daemons. The daemon may take the list of such daemons to monitor from a 
> file. I want to know how can this be programmatically achieved.

Might this be the thing that you're looking for? 

http://developer.apple.com/documentation/Darwin/Reference/ManPages/man8/launchd.8.html

Slashdot discussion here:
http://apple.slashdot.org/article.pl?sid=05/05/01/1858238&from=rss

My understanding is that it will allow starting and watching of other daemons and processes, in addition to a few other things.  I expect that it won't be too hard to port (assuming that no-one else has already), and Apple have released the source.
Tim