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Ken Brown a60a4501b7 Cygwin: ptsname_r: always return an error number on failure
Return EBADF on a bad file descriptor.  Previously 0 was returned, in
violation of the requirement in
https://man7.org/linux/man-pages/man3/ptsname_r.3.html that an error
number should be returned on failure.

We are intentionally deviating from Linux, on which ENOTTY is
returned.

Addresses: https://lists.gnu.org/archive/html/bug-gnulib/2021-01/msg00245.html
2021-01-22 10:36:43 -05:00
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