[pulseaudio-discuss] Remaining PA process after X logout

Tanu Kaskinen tanuk at iki.fi
Mon Feb 26 11:06:50 UTC 2018

On Mon, 2018-02-26 at 10:56 +0100, Takashi Iwai wrote:
> On Mon, 26 Feb 2018 10:47:09 +0100,
> Tanu Kaskinen wrote:
> > 
> > On Mon, 2018-02-26 at 10:20 +0100, Takashi Iwai wrote:
> > > On Mon, 26 Feb 2018 10:12:44 +0100,
> > > Tanu Kaskinen wrote:
> > > > What about fedora? I somehow would expect fedora to be eager to adopt
> > > > the socket activation feature in pulseaudio that has been available for
> > > > a long time already.
> > > > 
> > > > If you're using pulseaudio under systemd, it seems weird if all user
> > > > services don't get terminated on logout.
> > > 
> > > I guess they would hit the same issue.  But maybe there can be some
> > > workaround.
> > 
> > I don't think the same issue would affect pulseaudio if it was under
> > systemd control, unless the user instance of systemd keeps running for
> > longer than logind keeps the runtime dir around. I'd be very surprised
> > if that was the case. I had a look at systemd documentation, which
> > confirmed to me that when the user instance of systemd shuts down, it
> > will stop all services that haven't explicitly requested not to be
> > stopped.
> The man page of logind.conf seems wrong.  The default value of
> KillUserProcesses is "no" in the recent versions, judging from the
> configure.ac; i.e. systemd doesn't behave aggressively to kill user
> processes at logout.
> Maybe this setup can be the difference between distros?

The default value of KillUserProcesses can indeed cause differences
between distros, because it was changed to "yes" a couple of years ago.
I suppose you have an older version, since configure.ac doesn't exist
any more (systemd uses meson as the build system nowadays). Also, some
distros may have reverted the default back to "no" due to problems that
KillUserProcesses can cause.

However, I'm not talking about KillUserProcesses in the quoted
paragraph. I'm talking about the situation where there is a user
instance of systemd running and managing pulseaudio. Pulseaudio ships
.service and .socket files for systemd, which suse apparently doesn't
use. If suse were to use those, then the user instance of systemd would
manage the lifecycle of the pulseaudio daemon, and when the user
instance of systemd shuts down on logout, it should stop all services
it's managing (but not anything that it isn't managing). Logind's
KillUserProcesses is a different thing, and it should enter the picture
only if there's still something from the session running after systemd
has shut down.



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