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[[!meta copyright="Copyright © 2009, 2010, 2013 Free Software Foundation,
Inc."]]
[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
id="license" text="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
is included in the section entitled [[GNU Free Documentation
License|/fdl]]."]]"""]]
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.
# Startup
[[!taglink open_issue_glibc open_issue_hurd]]: Enumerate all the different
cases. Add tests to [[glibc]] to make sure all these work.
## `hurd/hurdstartup.h`:`hurd_startup_data`
Lives on the stack after arguments and environment.
The `phdr` and `phdrsz` members are only used in
`sysdeps/mach/hurd/dl-sysdep.c`:`_dl_sysdep_start` (for `[SHARED]`) and
`sysdeps/mach/hurd/i386/init-first.c`:`init1` (for `[!SHARED]`). See comments
in [[open_issues/glibc]] for commit 288f7d79fe2dcc8e62c539f57b25d7662a2cd5ff.
## `hurd/hurdstartup.c`:`_hurd_startup (void **argptr, void (*main) (intptr_t
*data))`
* Initialize `hurd_startup_data` based on
[[hurd/interface/exec_startup_get_info]] if we have a bootstrap port, or
else manually.
* Call `main`, which is either
`sysdeps/mach/hurd/dl-sysdep.c`:`_dl_sysdep_start`:`go` if called from
`sysdeps/mach/hurd/dl-sysdep.c`:`_dl_sysdep_start` (for `[SHARED]` only),
or `sysdeps/mach/hurd/i386/init-first.c`:`_hurd_stack_setup`:`doinit` if
called from `sysdeps/mach/hurd/i386/init-first.c`:`_hurd_stack_setup` (for
`[!SHARED]` only).
# 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.
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