[Bug 273962] copy_file_range does not work on shared memory objects

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273962

--- Comment #12 from Konstantin Belousov <k...@freebsd.org> ---
(In reply to David Chisnall from comment #11)
It is not required, it is quality of implementation.
POSIX does not require that read(2) works on shmfd at all.

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