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From: David Lang <>
To: Rob Landley <>
	David McCullough <>
Subject: Re: Feature request: exec self for NOMMU.
Date: Tue, 26 Dec 2006 15:55:27 -0800 (PST)
Message-ID: <Pine.LNX.4.63.0612261549050.24795@qynat.qvtvafvgr.pbz> (raw)
In-Reply-To: <>

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

  reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-26 23:23 Rob Landley
2006-12-26 23:55 ` David Lang [this message]
2006-12-27  0:39   ` Rob Landley
2006-12-27  4:24   ` Denis Vlasenko
2006-12-27  5:44     ` Rob Landley
2006-12-27  5:13 ` Ray Lee
2006-12-27  5:51   ` Rob Landley
2006-12-27  6:08     ` Vadim Lobanov
2006-12-27  8:29       ` Rob Landley
2006-12-27 18:49         ` Ray Lee
2006-12-27 21:13           ` Rob Landley
2006-12-27 18:35   ` Denis Vlasenko
2006-12-27 21:03     ` Rob Landley
2006-12-28  2:48       ` Denis Vlasenko
2006-12-28  5:32         ` Rob Landley

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