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Some bits about this, some bits about that.
---
Hurd controlling tty behavior is generally consistent with BSD's, including
`TIOCSCTTY`. Linux also has `TIOCSCTTY` and it is harmless to use it there.
But BSD and Hurd never do an implicit `TIOCSCTTY` (hence our `O_NOCTTY` is
zero).
C.f. <http://lists.gnu.org/archive/html/bug-hurd/2009-10/msg00030.html> and the
following messages.
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