Re: Signal handling possibly wrong

[Robert Wilkens <robw@optonline.net>]

Bodo,

SA_MASK is a flag... Which you use to tell it what to do with the data
you've given it and/or it gets.  You gave it sa_mask (lower-case).
SA_NOMASK means don't use the mask -- the pseudonym (new-word) for
SA_NOMASK is SA_NODEFER (renamed, perhaps, because it may defer some or
all signals rather than throwing them away, you probably can receive the
waiting signals by clearing the SA_NODEFER flag on a subsequent call).

If you want to take this off-list, I'm OK with that..

Please describe what you would expect SA_NODEFER to do in your own
language if you don't understand what I seem to understand.

-Rob
On Tue, 2005-08-09 at 20:32 +0200, Bodo Stroesser wrote:
> Robert Wilkens wrote:
> >>Kernel code blocks both "handled signal" _and_ sa_mask only if SA_NODEFER
> >>isn't set.
> >>
> >>Which is the right behavior?
> > 
> > 
> > Perhaps both?
> > 
> > I'm novice here, but if i'm reading the man page correctly, it says:
> > 
> > SA_NODEFER
> >    Do not prevent the signal from being received from within
> >    its  own  signal handler. 
> > 	(they also imply that SA_NOMASK is the old name for this,
> > 	which might make it clear what it's use is).
> > 
> > In which case blocking (masking) when it's not set is exactly what it's
> > supposed to do.
> > 
> > -Rob
> 
> Yes. That's true.
> 
> But what about sa_mask? Description of SA_NODEFER and sa_mask both do not
> say, that usage of sa_mask depends on SA_NODEFER.
> But kernel only uses sa_mask, if SA_NODEFER isn't set.
> 
> So, I think man page and kernel are not consistent.
> 
> 	Bodo
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