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List:       linux-newbie
Subject:    use cases for mmap
From:       Kun Huang <gareth () openstacker ! org>
Date:       2014-05-16 2:14:30
Message-ID: CAMKaFC_OoDFjD-2a0GNYEPANVxXztCQL15U5u-zNFqR5Ud2J6g () mail ! gmail ! com
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Hi guys

I'm reading&learning kernel codes and have a question for mmap. Many
guys said mmap is good for sharing data between processes[0]. But how
does mmap do that?

In document, mmap is defined as:

mmap(void *addr, size_t len, int prot, int flags, int fd, off_t offset)

That addr is virtual address and different processes have different
address space. So after put a file into memory via addr$offsett, how
does another process read that data?

Btw, are there some common use cases for mmap, in application layer?

[0] http://stackoverflow.com/questions/258091/when-should-i-use-mmap-for-file-access


Thanks :)

Gareth
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