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From: mouse@mcgill-vision.UUCP
Newsgroups: comp.unix.questions
Subject: Re: Wanted: info about signal handling routines
Message-ID: <722@mcgill-vision.UUCP>
Date: Wed, 1-Apr-87 19:15:13 EST
Article-I.D.: mcgill-v.722
Posted: Wed Apr  1 19:15:13 1987
Date-Received: Thu, 9-Apr-87 00:11:06 EST
References: <276@pluto.UUCP>
Organization: McGill University, Montreal
Lines: 32
Keywords: sighold, sigrelse, sigset

In article <276@pluto.UUCP>, warren@pluto.UUCP (Warren Burstein) writes:
> I found undefined refs in a program that does job control to sighold,
> sigrelse, and sigset.  Are they part of BSD4.2,

I believe those are 4.1c -ljobs routines.  Under 4.2 they migrated into
libc and got renamed: sighold to sigblock, sigrelse disappeared, sigset
to sigvec.  The arguments also changed somewhat.

> what do they do,

Been a while since I used 4.1.  But as I recall, sighold blocks
delivery of a signal but does not throw away instances the way
sigignore does.  Under 4.2, use sigblock instead.

Sigrelse is necessary when longjmp()ing out of a signal handler.  Under
4.2 this is handled correctly by longjmp, so sigrelse vanished.

Sigset was the primitive for installing a handler.  Under 4.2, use
signal() or sigvec().

> and can I replace them with something?

You don't say what operating system you want the replacements to run
under, so I can't help you.  Above are rough equivalents for 4.2 and
4.3, though I think the arguments have changed.

					der Mouse

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