Re: [OT] 'volatile' in userspace

Philippe Troin
2006-07-10T20:10:00Z

Jeff Dike <jdike@addtoit.com> writes:

> On Mon, Jul 10, 2006 at 10:00:37AM -0700, Joshua Hudson wrote:
> > Yes, I use vfork. So far, the only way I have found for the parent to
> > know whether or not the child's exec() failed is this way:
>
> What I do in UML is make a pipe between the parent and child, set it
> CLOEXEC, and write a byte down it if the exec fails.
>
> The parent reads it - if it gets no bytes, the exec succeeded, if it
> gets one byte, it failed.

I usually do the same, except that I write the errno in case of
failure. This way the parent knows *why* exec failed ;-)

Phil.