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From: gwyn@BRL-VLD.ARPA@sri-unix.UUCP
Newsgroups: net.lang.c
Subject: Re:  Shouldn't this work?
Message-ID: <12753@sri-arpa.UUCP>
Date: Thu, 23-Aug-84 19:14:59 EDT
Article-I.D.: sri-arpa.12753
Posted: Thu Aug 23 19:14:59 1984
Date-Received: Thu, 30-Aug-84 01:11:11 EDT
Lines: 19

From:      Doug Gwyn (VLD/VMB) <gwyn@BRL-VLD.ARPA>

There is nothing wrong with your example.  I suspect you are using
an old (pre-UNIX System V) portable C compiler (e.g. UNIX System III
or 4.[12]BSD); these do not correctly handle pointers to void-
valued functions.  Lint is built from PCC sources and has the same
problem.  Starting with Release 1.0 of UNIX System V, the portable
C compiler and lint handled this correctly.  I tried the Gould UTX
C compiler on this very thing and it is better than usual, but not
yet perfect.

I believe that the reason that the signal() function has been
misdefined for so long is that the compilers could not handle
the correct type declaration.  I urge the UNIX developers to FIX
THIS now that their compilers are working:

extern void	(*signal())();
#define	SIG_DFL	(void (*)())0
#define	SIG_IGN	(void (*)())1