linux-kernel - Feature request: exec self for NOMMU.

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Message-Id: <200612261823.07927.rob@landley.net>
Date:	Tue, 26 Dec 2006 18:23:07 -0500
From:	Rob Landley <rob@...dley.net>
To:	linux-kernel@...r.kernel.org
Cc:	David McCullough <david_mccullough@...securecomputing.com>
Subject: Feature request: exec self for NOMMU.

I'm trying to make some nommu-friendly busybox-like tools, which means using 
vfork() instead of fork().  This means that after I fork I have to exec in 
the child to unblock the parent, and if I want to exec my current executable 
I have to find out where it lives so I can feed the path to exec().  This is 
nontrivial.

Worse, it's not always possible.  If chroot() has happened since the program 
started, there may not _be_ a path to my current executable available from 
this process's current or root directories.

What would be really nice is if I could feed a NULL path to exec on NOMMU 
systems, and have that mean "re-exec the current executable".  I can't think 
of a way to do this without kernel support.  Any opinions on whether this is 
worthwhile?

A nommu-friendly daemonize() is another use for this, by the way...

Rob
-- 
"Perfection is reached, not when there is no longer anything to add, but
when there is no longer anything to take away." - Antoine de Saint-Exupery
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