[Bug 191931] isatty(-1)/ttyname_r(-1, ...) sets EBADF instead of ENOTTY; does not conform to manpage/POSIX

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191931

Jilles Tjoelker <jilles at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|Needs Triage                |Issue Resolved
                 CC|                            |jilles at FreeBSD.org
         Resolution|---                         |Works As Intended

--- Comment #1 from Jilles Tjoelker <jilles at FreeBSD.org> ---
This looks like a bug in the standard that was fixed for POSIX.1-2008/SUSv4,
which has the expected [EBADF] (invalid file descriptor) and [ENOTTY] (not a
terminal) error conditions. According to the change history, the erratum is
SD5-XSH-ERN-100.

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