Message-ID: <009d01dc9f25$25dae0e0$7190a2a0$@gmx.de>
Date: 2026-02-16T09:18:00Z
From: m@tthi@s-go@d@@ m@iii@g oii gmx@de
Subject: [R-pkg-devel] Forward SIGUSR1/2 to package (cont'd)
Interesting! Can you point me to one of these packages, so that I see how
they solved the problem? Much appreciated.
The package ("rswipl") is a bridge to SWI-Prolog, and that uses signals for
communication (e.g., between threads). Whenever SIGUSR2 is sent, R stops. I
don't really need this for my own purposes, but the signals are part of the
unit tests of SWI-Prolog, and I wanted to invoke these unit tests on R CMD
check.
? Sun, 15 Feb 2026 13:08:32 +0100
Matthias Gondan <https://stat.ethz.ch/mailman/listinfo/r-package-devel>
?????:
> I understand that SIGUSR1 and 2 terminate an R session, and I cannot
> handle them in a package, or can I?
Quite a few packages on CRAN use sigaction() to temporarily set up a
different handler for a signal (SIGINT, SIGALRM, SIGCHLD, sometimes
even SIGSEGV), retain the original handler (presumably set up by R),
then restore it when done.
How are you planning to use the signals?
--
Best regards,
Ivan