pidfile_open incorrectly returns EAGAIN when pidfile is locked

[John Baldwin]

On Thursday, March 14, 2013 4:21:02 pm Pawel Jakub Dawidek wrote:
> On Thu, Mar 14, 2013 at 10:11:07AM -0700, Chuck Swiger wrote:
> > Hi--
> > 
> > On Mar 14, 2013, at 9:50 AM, John Baldwin wrote:
> > > On Thursday, March 14, 2013 12:29:58 pm Pawel Jakub Dawidek wrote:
> > 
> > [ ... ]
> > >> Heh, I did consider that as well, but here you check errno twice,
> > >> instead of once. Guys, is there anything wrong with the patch I
> > >> proposed?
> > > 
> > > I'm sure the compiler can work that out just fine and it should do whatever
> > > is most readable to the programmer.  I don't care either way.
> > 
> > Strong +1.  Having the code be correct and readable is much more important
> > then trying to hand-optimize a single-digit # of integer compares in
> > startup code that usually runs ~once per process.
> 
> Well, I think my version is more obvious, just the diff is larger.
> Anyway, I think enough has been said already about this crucial change:)

Yours is fine, commit it already.

-- 
John Baldwin