GNU bug report logs - #14640
SA_RESTART prevents execution of signal handlers

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Package: guile;

Reported by: ludovic.courtes <at> inria.fr (Ludovic Courtès)

Date: Mon, 17 Jun 2013 14:07:02 UTC

Severity: normal

Done: Andy Wingo <wingo <at> pobox.com>

Bug is archived. No further changes may be made.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: ludovic.courtes <at> inria.fr (Ludovic Courtès)
To: bug-guile <at> gnu.org
Subject: SA_RESTART prevents execution of signal handlers
Date: Mon, 17 Jun 2013 15:54:45 +0200

When using SA_RESTART, signal handlers are never executed, as in this
example (checked on 2.0.9+):

--8<---------------cut here---------------start------------->8---
(sigaction SIGALRM
  (lambda (signum)
    (pk 'sig signum))
  SA_RESTART)
(alarm 3)
(pk 'char (read-char))
--8<---------------cut here---------------end--------------->8---

Presumably this is because the read(2) syscall is automatically
restarted, leaving no chance for the handler async to run.

Ludo’.
This bug report was last modified 8 years and 334 days ago.

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