From owner-freebsd-hackers@FreeBSD.ORG  Wed Jan  9 05:25:19 2013
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Subject: Re: Is it possible to block pending queued RealTime signals (AIO
 originating)?
From: Richard Sharpe <rsharpe@richardsharpe.com>
To: Daniel Eischen <deischen@freebsd.org>
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Date: Tue, 08 Jan 2013 21:25:13 -0800
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Cc: freebsd-hackers@freebsd.org, David Xu <davidxu@freebsd.org>
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On Tue, 2013-01-08 at 22:24 -0500, Daniel Eischen wrote:
> On Tue, 8 Jan 2013, Daniel Eischen wrote:
> 
> > On Tue, 8 Jan 2013, Richard Sharpe wrote:
> >
> >> [ ... ]
> >> 
> >> Well, it turns out that your suggestion was correct.
> >> 
> >> I did some more searching and found another similar suggestion, so I
> >> gave it a whirl, and it works.
> >> 
> >> Now, my problem is that Jeremy Allison thinks that it is a fugly hack.
> >> This means that I will probably have big problems getting a patch for
> >> this into Samba.
> >
> > I don't understand why JA thinks this is a hack.  Their current
> > method doesn't work, or at least isn't portable.  I've tried this
> > on Solaris 10, and it works just as it does in FreeBSD.  Test
> > program included after signature.
> >
> >  $ ./test_sigprocmask
> >  Sending signal 16
> >  Got signal 16, blocked: true
> >  Blocking signal 16 using method 0
> >  Handled signal 16, blocked: false
> >
> >  Sending signal 16
> >  Got signal 16, blocked: true
> >  Blocking signal 16 using method 1
> >  Handled signal 16, blocked: true
> 
> Weird - I just tested it on Linux (2.6.18-238.el5) and it works
> the same as FreeBSD and Solaris.  Am I misunderstanding something?
> Is it possible that Samba's code is broken on all platforms?

It is possible :-) 

AIO is off by default in configure. Then, when you switch it on in
configure you have to switch it on in the smb.conf.