Path: utzoo!attcan!uunet!mcvax!hp4nl!eutrc3!wzv!wietse
From: wietse@wzv.UUCP (Wietse Z. Venema)
Newsgroups: comp.unix.microport
Subject: Re: Compile errors on V/386 3.0E
Summary: signal is not void
Message-ID: <170@wzv.UUCP>
Date: 12 Dec 88 23:21:47 GMT
References: <680@wa3wbu.UUCP> <417@zinn.MV.COM> <273@uport.UUCP>
Reply-To: wietse@wzv.UUCP (Wietse Z. Venema)
Organization: Eindhoven University of Technology, The Netherlands
Lines: 25

In article <273@uport.UUCP> plocher@uport.UUCP (John Plocher) writes:
# (from <signal.h>)
# 
# 		extern	void(*signal())();
# 		extern  void(*sigset())();
# 
# The news code assumes signal() is of type int; signal.h declares it as type
# void, and the compiler says "oops", just like it should.  The >>warning<<
# >>seems<< to be ignorable.
# [...]
# I thought type void meant "nothing returned", yet signal is clearly type void
# and it returns something!  What don't I understand here? :-)
# 
#    John Plocher

Actually, signal is not of type void:

    cdecl> explain void(*signal())()
    declare signal as function returning pointer to function returning void

So it really is declared as returning something...
-- 
work:	wswietse@eutrc3.uucp	| Eindhoven University of Technology
work:	wswietse@heitue5.bitnet	| Mathematics and Computing Science
home:	wietse@wzv.uucp		| 5600 MB Eindhoven, The Netherlands