Groups > comp.os.linux.development.apps > #588

Re: mmap for IPC

From	Lusotec <nomail@nomail.not>
Newsgroups	comp.os.linux.development.apps
Subject	Re: mmap for IPC
Followup-To	comp.os.linux.development.apps
Date	2013-05-01 21:12 +0100
Organization	A noiseless patient Spider
Message-ID	<klrsop$k80$1@dont-email.me> (permalink)
References	<5b2c726f-7805-401e-8c42-9407adf6ce9f@googlegroups.com>

Followups directed to: comp.os.linux.development.apps

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Jay Braun wrote:
> Just want to make sure:  If I use mmap for inter-process communication,
> the processes that share the memory need not be forked from some parent
> process.  They can be invoked independently, correct?

Yes, if the mapping is not anonymous. If the mapping is anonymous only the 
process and its children can access the anonymous mapping (see MAP_ANONYMOUS 
in man mmap).

On a side note, you may want to use shm_open instead of mmap directly if you 
want to use shared memory for IPC between unrelated processes.

Regards.
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mmap for IPC Jay Braun <lyngwyst@gmail.com> - 2013-05-01 11:27 -0700
  Re: mmap for IPC Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-05-01 20:08 +0100
  Re: mmap for IPC Lusotec <nomail@nomail.not> - 2013-05-01 21:12 +0100
    Re: mmap for IPC Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-05-02 14:42 +0100
  Re: mmap for IPC Jasen Betts <jasen@xnet.co.nz> - 2013-05-04 09:27 +0000

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