Xref: utzoo comp.unix.wizards:11831 comp.bugs.sys5:631
Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!agate!bionet!apple!bloom-beacon!tut.cis.ohio-state.edu!osu-cis!att!ihlpb!gregg
From: gregg@ihlpb.ATT.COM (Wonderly)
Newsgroups: comp.unix.wizards,comp.bugs.sys5
Subject: Re: System V messages problem
Message-ID: <8957@ihlpb.ATT.COM>
Date: 19 Oct 88 14:16:45 GMT
References: <1794@runx.ips.oz>
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 27

From article <1794@runx.ips.oz>, by rosko@runx.ips.oz (Ross McKay):
> 
> Hello,
> 	I have been trying to get message passing to work on my Microport
> System.
> .....
>
> ------CUT HERE FOR EXAMPLE CODE---8<-----------------------------------------
> 
> 	for(i = 0; i < 20; ++i)
                      ^^^
PLEASE, PLEASE, PLEASE use NSIG here or something a little more portable.
Signal numbers start at 1 besides...

> 		signal(i, cleanup);
> 
> 	if((msgid = msgget(MSGKEY, -1)) == -1)
                                  ^^^
Try using the actual flag here.  MAKE IT OBVIOUS WHAT THE HECK YOU ARE
DOING.

You are also setting IPC_EXCL, IPC_NOWAIT besides IPC_CREATE.  If the key
already exists, then this will fail with EEXIST.

-- 
Gregg Wonderly
AT&T Bell Laboratories                   DOMAIN: gregg@ihlpb.att.com
IH2D217 - (312) 979-2794                 UUCP:   att!ihlpb!gregg