Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!mcnc!rti!bnrunix!rrs
From: rrs@bnrunix.UUCP (Randall Stewart)
Newsgroups: comp.sys.hp
Subject: HP-UX type declaration problem with signal(2)
Keywords: HP-UX signal
Message-ID: <218@bnrunix.UUCP>
Date: 23 Jun 89 14:58:50 GMT
Organization: BNR Inc., RTP, NC
Lines: 41

saves the old signal handler and then set's a signal handler and of
course at a later time restores the original signal handler...
********************************************************************
#include <signal.h>
        
int (*old)(),newhand();

old = signal(SIGINT,newhand);
..
...code of module
..
signal(SIGINT,old);

When compiling on a 6.2 machine I had no problems but when I compile on
a 6.5 machine. I get "line xxxx: warning: incorrect pointer combination"

upon looking at <signal.h> and comparing the 6.2 vs: the 6.5, I find this
difference...

6.2---
extern  (*signal())();


6.5---
extern  void (*signal())();
******************************************************
Should not 6.5 have a statement more like 6.2?????

Or to be real picky I would prefer:

extern int (*signal())();

---------
Being the paranoid type I even wrote a small test program to make sure
that the 6.5 signal call still returns the old function pointer.
It worked as expected and I did get a return of a function
pointer from signal.

What do y'all think?

Randall