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.
Bruno
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