[systemd-devel] How to get all PIDs in a service

[Sébastien Luttringer]

Hello,

In order to restart updated daemons on filesystems, I created a
script[1] which lists all PID by service and look for updated files in
/proc/$pid/maps.

To get all PIDs of a service, I use "systemctl show -p ControlGroup" to
craft a path to the "tasks" file.

But something wrong happen with escaping with some units (e.g serial
-getty)

This works:
#cat /sys/fs/cgroup/systemd/$(systemctl show systemd-logind.service -p
ControlGroup|cut -f2 -d=)/tasks
286

This not:
#cat /sys/fs/cgroup/systemd/$(systemctl show serial-getty at ttyS0.service 
-p ControlGroup|cut -f2 -d=)/tasks
/sys/fs/cgroup/systemd/$(systemctl show  -p ControlGroup|cut -f2 -d=)
cat: /sys/fs/cgroup/systemd//system.slice/system-serial\
x5cx2dgetty.slice/serial-getty at ttyS0.service/tasks: No such file or
directory

What's the right way to get all pid belonging to a service? How can I
unescape strings from systemctl?

This is happening since a long time. I made these tests on systemd v220
et v219.

Cheers,

[1] https://github.com/seblu/archutils/blob/master/checkservices

-- 
Sébastien "Seblu" Luttringer
https://seblu.net | Twitter: @seblu42
GPG: 0x2072D77A
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