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hurd: Make _exit work during early boot-up

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If any of the early boot-up tasks calls exit () or returns from main (),
terminate it properly instead of crashing on trying to dereference
_hurd_ports and getting forcibly terminated by the kernel.

We sadly cannot make the __USEPORT macro do the check for _hurd_ports
being unset, because it evaluates to the value of the expression
provided as the second argument, and that can be of any type; so there
is no single suitable fallback value for the macro to evaluate to in
case _hurd_ports is unset. Instead, each use site that wants to care for
this case will have to do its own checking.

Checked on x86_64-gnu.

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230429131354.2507443-4-bugaevc@gmail.com>
This commit is contained in:
Sergey Bugaev 2023-04-29 16:13:51 +03:00 committed by Samuel Thibault
parent a9fb57105e
commit 41aac87234
1 changed files with 3 additions and 2 deletions
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5
sysdeps/mach/hurd/_exit.c
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@ -24,8 +24,9 @@
void
_hurd_exit (int status)
{
/* Give the proc server our exit status. */
__USEPORT (PROC, __proc_mark_exit (port, status, 0));
if (_hurd_ports != NULL)
/* Give the proc server our exit status. */
__USEPORT (PROC, __proc_mark_exit (port, status, 0));
/* Commit suicide. */
__task_terminate (__mach_task_self ());