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From: gt0178a@prism.gatech.EDU (BURNS,JIM)
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: Re: Are pointers in a shared memory segment valid for a different process?
Message-ID: <13003@hydra.gatech.EDU>
Date: 25 Aug 90 00:45:55 GMT
References: <1990Aug24.115009.24808@virtech.uucp>
Followup-To: comp.unix.questions
Organization: Georgia Institute of Technology
Lines: 17

in article <1990Aug24.115009.24808@virtech.uucp>, cpcahil@virtech.uucp (Conor P. Cahill) says:
> For other processes:
> 	get segment id
> 	attach segment at default address
> 	get correct attachment address (from the shared memory segment itself)
> 	detach & re-attach at the correct address.

To summarize some points made in a recent similar thread in
comp.unix.wizards, this only works if your OS allows specifying the attach
address, and, if the OS is virtual, the attach address means the same
thing in different process address spaces. Specifying offsets may be more
work, but its more portable.
-- 
BURNS,JIM
Georgia Institute of Technology, Box 30178, Atlanta Georgia, 30332
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