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SubjectRe: Async IO

Negativ signal values are used to reach a process with all its childs
i.e. a process group. Positiv signal values are used to reach exactly
one process and the 0-signal is used to check if there is a process with
this number ..



----------------------------------------------------------------------
* Michael Eyrich, PRZ, TU-Berlin, FB Informatik +49-30-31426713 *
* michey@prz.tu-berlin.de ** http://www.prz.tu-berlin.de/~michey/ *
----------------------------------------------------------------------

On Mon, 3 Feb 1997, Richard B. Johnson wrote:

> On 3 Feb 1997, Jurgen Botz wrote:
>
> > In article <vyzraj29l7p.fsf@issan.informatik.uni-dortmund.de>,
> > Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de> wrote:
> > >|> signal number 0 is unused
> > >
> > >No, it's not. It has a defined meaning (see kill(2)).
> >
> > Hmm, my kill(2) manpage (readhat 4.0) doesn't mention anything
> > about signal number 0. Enlighten us?
> >
> > --
> > Jurgen Botz "Unix? What's that? Is that like Linux?"
> > jbotz@reference.com
> >
> I read somewhere that ALL negative signal codes are reserved for USER
> signals. This should mean that only the positive ones need to be defined.
> You should be able to use any negative signal code you want for user
> process signaling.
>
> "The signal code 0 is the "null" signal to be sent ONLY by kill()"
> (whatever that means). If sigsend() is used to send a signal, and the
> signal type is 0, error checking is performed, but no signal is sent.
> This can be used to check the validity of the id and id type .....
> This from SunSlosh man pages.
>
>
>
> Cheers,
> Dick Johnson
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> Richard B. Johnson
> Project Engineer
> Analogic Corporation
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