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The GNU Hurd uses a similar concept to [[UNIX processes|unix/process]].

As a [[Mach task|microkernel/mach/task]] only implements a part of a UNIX
process, there is additional work to be done, for example for [[signal]]s,
[[environment_variable]]s, [[file_descriptor]]s.


# Controlling TTY

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.