Re: use cases for mmap

[Kyle Nusbaum <kylejnusbaum@gmail.com>]

You might take a look at the MAP_SHARED and MAP_ANONYMOUS flags in the 
mmap(2) man page.

--Kyle

On 05/15/2014 09:14 PM, Kun Huang wrote:
> 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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