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    SubjectRe: [RFC] mapping parts of shared memory


    On Thu, 2 Dec 1999, Bruno Haible wrote:

    > 5) Use the proc filesystem. Implement a file /proc/ipc/shm/42 as being
    > equivalent to the shared memory segment with id 42.
    > File type: regular file
    > File size: the shm segment's size
    > File contents (for use by read, write, mmap): the shm segment's data
    > File owner/group: the shm segment's owner and group
    > truncate(): return -EINVAL
    >
    > Not only would this solve your "mmap of shared memory" problem, it would
    > become possible to view and edit shared memory using "cat", "hexdump" and
    > "vi". Benefits of the "everything is a file" philosophy.

    Don't do it in procfs. Make a separate filesystem and mount it on the
    empty directory in /proc, if you really need it (I'ld rather use some
    other location - even /dev/shm would be better). This filesystem will have
    _nothing_ with proc in terms of code. There is enough mess in procfs
    already. Keep this one separate.


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