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From: connors@druco.ATT.COM (ConnorsPA)
Newsgroups: comp.unix.wizards
Subject: Re: Summary - lost of SIGIO signal in SunOS4.1/4.0.3
Summary: SVR4 capability
Message-ID: <8900@drutx.ATT.COM>
Date: 3 Jun 91 18:48:22 GMT
References: <27089@adm.brl.mil>
Sender: news@drutx.ATT.COM
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In article <27089@adm.brl.mil>, TAYBENGH%NUSDISCS.BITNET@cunyvm.cuny.edu (THE AGEIS) writes:
> 
>         The answer of my question is:
>         Although the Sun DOES provide reliable signal, it does NOT mean
> a signal counter is kept. If there are 2 instances of a same signal say SIGIO
> are asserted before the first one can be serviced, only one of them will be
> delivered.

I know nothing about the various Sun OSs. However, UNIX System V Release 4
does provide both reliable signals *and* the capability of queueing them.
As an example, it can be arranged that a parent process receive an
individual signal when *each* of its child processes exits. The
individual signals *are* queued. SIGIO can also be queued in this way.

For those with manuals, check out the SA_SIGINFO parameter
to sigaction(2); and siginfo(5).

-----------------------------
 Paul Connors
 Email:	att!druco!connors
-----------------------------