Re: [OT] 'volatile' in userspace

[Philippe Troin]

Jeff Dike <jdike@xxxxxxxxxxx> 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.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/