Path: utzoo!attcan!uunet!samsung!uakari.primate.wisc.edu!bin
From: bin@primate.wisc.edu (Brain in Neutral)
Newsgroups: comp.unix.ultrix
Subject: sigvec/signal handler return values?
Message-ID: <1569@uakari.primate.wisc.edu>
Date: 8 Feb 90 16:41:01 GMT
Organization: UW-Madison Primate Center
Lines: 45


The Ultrix 3.1 man page for the signal(3) system call says that the handler
function to signal() returns void, but the example function declaration
returns int.  Which is it?

SYNTAX
     #include <signal.h>

     (*signal(sig, func))()
     void (*func)();

NOTES  (VAX-11)
     The handler routine can be declared:

          handler(sig, code, scp)
----------------------------------------------------------------------------
I am also uncertain what to think about the sigvec(2) system call.  My 
Ultrix 3.1 on-line man page says:

SYNTAX
     #include <signal.h>

     struct sigvec {
        void        (*sv_handler)();
        sigset_t    sv_mask;
        int         sv_flags;
     };

NOTES
     The handler routine can be declared:

          void handler(sig, code, scp)
          int sig, code;
          struct sigcontext *scp;

But my 3.0 on-line and printed man pages say sv_handler returns int,
not void, and the example declaration is of a function that returns int,
not void.

Which is it?  int or void?  And why the discrepancy?

Paul DuBois
Internet:	dubois@primate.wisc.edu
UUCP:		rhesus!dubois
FAX:		608/263-4031