Re: [Qemu-devel] [PATCH v2 2/1] libqtest: add more exit status checks

[Michael S. Tsirkin]

On Thu, May 24, 2018 at 11:00:19AM -0500, Eric Blake wrote:
> On 05/24/2018 10:52 AM, Eric Blake wrote:
> 
> > Also, since waitpid() can only return either s->qemu_pid or -1 as we
> > aren't using WNOHANG, it may also be worth asserting that if pid == -1,
> > we either have EAGAIN (but why aren't we looping in that case?) or
> > ECHILD.
> 
> I meant EINTR, not EAGAIN.  But in general, using waitpid() to collect
> process status without doing it in a loop is risky.

Interesting. Risky how?

> -- 
> Eric Blake, Principal Software Engineer
> Red Hat, Inc.           +1-919-301-3266
> Virtualization:  qemu.org | libvirt.org