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

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Date:	Tue, 26 Dec 2006 15:55:27 -0800 (PST)
From:	David Lang <david.lang@...italinsight.com>
To:	Rob Landley <rob@...dley.net>
cc:	linux-kernel@...r.kernel.org,
	David McCullough <david_mccullough@...securecomputing.com>
Subject: Re: Feature request: exec self for NOMMU.

On Tue, 26 Dec 2006, Rob Landley wrote:

> 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.

does this even make sense (as a general purpose function)? if the executable 
isn't available in your path it's likly that any config files it needs are not 
available either.

> 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?

for something like busybox/toolbox where you have different functions based on 
the name used to execute the program, which name would you use?

David Lang

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