--- Begin Message ---
Subject: |
Signal handlers not called after ‘primitive-fork’ |
Date: |
Thu, 28 Dec 2023 18:16:52 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) |
In 3.0.9 and current ‘main’, I get this:
--8<---------------cut here---------------start------------->8---
$ cat sigaction-fork.scm
(use-modules (ice-9 match))
;; This call spawns the signal delivery thread as a side effect.
(sigaction SIGALRM
(lambda (signal)
(pk 'got-signal! signal)))
(match (primitive-fork)
(0
(pk 'child (getpid))
(sigaction SIGALRM
(lambda (signal)
;; This handler is never called!
(pk 'got-signal-child! signal)))
(kill 0 SIGALRM)
(pk 'alarm-sent))
(_
(primitive-exit 0)))
$ guile sigaction-fork.scm
;;; (child 30308)
;;; (alarm-sent)
--8<---------------cut here---------------end--------------->8---
Everything works fine if we remove the pre-fork ‘sigaction’ call.
Ludo’.
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--- Begin Message ---
Subject: |
Re: bug#68087: Signal handlers not called after ‘primitive-fork’ |
Date: |
Wed, 24 Jan 2024 11:34:57 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) |
Ludovic Courtès <ludo@gnu.org> skribis:
> Fixes <https://bugs.gnu.org/68087>.
>
> * libguile/scmsigs.h (scm_i_signals_pre_fork, scm_i_signals_post_fork):
> New declarations.
> (scm_i_signal_delivery_thread): Change type to SCM..
> * libguile/threads.c (scm_all_threads): Adjust accordingly and exclude
> threads that have ‘t->exited’. Access ‘thread_count’ after grabbing
> ‘thread_admin_mutex’.
> * libguile/posix.c (scm_fork): Add calls to ‘scm_i_signals_pre_fork’ and
> ‘scm_i_signals_post_fork’.
> * libguile/scmsigs.c (signal_delivery_thread): Close signal_pipe[0] upon
> exit and set it to -1.
> (once): New file-global variable, moved from…
> (scm_i_ensure_signal_delivery_thread): … here.
> (stop_signal_delivery_thread, scm_i_signals_pre_fork)
> (scm_i_signals_post_fork): New functions.
> * test-suite/standalone/test-sigaction-fork: New file.
> * test-suite/standalone/Makefile.am (check_SCRIPTS, TESTS): Add it.
Pushed as 5a8502a4946e8a5b5c40a127aa240fc6ad960d03.
Ludo’.
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