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From: dave@uwvax.UUCP (Dave Cohrs)
Newsgroups: net.unix,net.unix-wizards
Subject: Re: Shared Memory
Message-ID: <165@uwvax.UUCP>
Date: Thu, 4-Apr-85 09:17:44 EST
Article-I.D.: uwvax.165
Posted: Thu Apr  4 09:17:44 1985
Date-Received: Sun, 7-Apr-85 03:12:32 EST
References: <563@ahuta.UUCP>
Organization: U of Wisconsin CS Dept
Lines: 20
Xref: watmath net.unix:4130 net.unix-wizards:12721

> 	How do you pass a key from one process to
> another process so that both processes have acess to the
> same "shmid"?
> 	In other words how do you insure that each 
> process has the same shared memory id?

I have implemented the SysV shared memory (well, not very well, but it
works like the man pages describe) under 4.2BSD.  In one application,
we open up a server socket and the process with wants the same shmid
connects to this and gets it.  If you don't have these neat 4.2 functions,
I'd suggest sending the shmid through a pipe to the other process or,
if they aren't parent and child, make a famous file and put it there.

dave
-- 
dave cohrs
...!{allegra,harvard,ihnp4,seismo}!uwvax!dave
dave@wisc-limburger.arpa

    (bug?  what bug?  that's a feature!)