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

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Message-ID: <2c0942db0612262113v5b504aecmdd922193415b60de@mail.gmail.com>
Date:	Tue, 26 Dec 2006 21:13:39 -0800
From:	"Ray Lee" <madrabbit@...il.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 12/26/06, Rob Landley <rob@...dley.net> 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.

How about openning an fd to yourself at the beginning of execution, then calling
fexecve later?
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