Messages in this thread |  | | Date | Wed, 5 Feb 1997 10:28:18 +0100 (MET) | From | Michael Eyrich <> | Subject | Re: Async IO |
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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 > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > Richard B. Johnson > Project Engineer > Analogic Corporation > Voice : (508) 977-3000 ext. 3754 > Fax : (508) 532-6097 > Modem : (508) 977-6870 > Ftp : ftp@boneserver.analogic.com > Email : rjohnson@analogic.com, johnson@analogic.com > Penguin : Linux version 2.1.23 on an i586 machine (66.15 BogoMips). > Warning : It's hard to remain at the trailing edge of technology. > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- >
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