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Groups > comp.os.linux.development.apps > #589

Re: mmap for IPC

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Lusotec <nomail@nomail.not> writes:
> 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.

Quoting shm_open(3):

	A POSIX shared memory object is in effect a handle which can
	be used by unrelated processes to mmap(2) the same region of
	shared memory.
      

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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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