https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241559

--- Comment #1 from Conrad Meyer <[email protected]> ---
Unfortunately write() => 0 has no special semantics in POSIX or FreeBSD.  It
just means partial progress / no error.  (So I don't think the proposed change
to cat is correct.)  This interacts poorly with block devices in FreeBSD, which
may truncate IO silently at end of device so long as the offset is in-bounds.

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