[Bug 241559] cat(1) endless loop when writing to special device file

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

--- Comment #1 from Conrad Meyer <cem at freebsd.org> ---
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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