SIGPIPE set to SIG_IGN for whole process tree

From: Rasmus Villemoes via skaware <skaware_at_list.skarnet.org>
Date: Wed, 17 Mar 2021 14:37:26 +0100

It seems that s6-svscan and s6-supervise sets SIGPIPE to ignored, which
is fine if that's what they want. But that setting seems to then be
inherited to the entire process tree, which can cause all kinds of weird
problems (very few programs themselves set signal dispositions). Mostly
it's simple shell pipelines that end up printing an EPIPE error when it
should normally just die silently.

I don't even see an execline helper to set a/all signals to SIG_DFL,
which one could otherwise stick into the beginning of every run script -
but really, I'd much rather not have to do even that, and just have
s6-supervise provide a sane and predictable signal "environment" for
everything it spawns.

Have I missed some option or some piece of documentation?

Rasmus
Received on Wed Mar 17 2021 - 13:37:26 UTC