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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