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DragonFly kernel List (threaded) for 2003-07
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Re: just curious

From: Peter da Silva <peter-dragonfly@xxxxxxxxxxx>
Date: Mon, 21 Jul 2003 09:46:33 -0500

Matthew Dillon wrote:
    Since the in-kernel storage format is VM Objects, offsets, and ranges,
    now actual shadowing or copy-on-write is really needed.  The target
    process would have the option of using lseek/read/write on the descriptor,
    or mmapping() it.  mmap()ing it would result in the data being shared,
    but with mmap() one can also make things copy-on-write (MAP_PRIVATE), and
    so forth.  We already have the VM object layering model in place in the
    kernel to make it all possible so it would not require any special effort.

So you'll be able to use the normal UNIX system calls to access arbitrary VM objects? So if I have a VM object that represents a buffer in another user process, it'll just look like a file to me? What happens if I overrun the end of the buffer, ENOSPC?

That's got some amazingly cool possibilities.

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