[systemd-devel] systemd release agent

[Michal Schmidt]

On 04/16/2013 07:45 PM, Kevin Wilson wrote:
> No I moved /usr/lib/systemd/systemd-cgroups-agent to some backup.
> and made sure that:
>
> ls /usr/lib/systemd/systemd-cgroups-agent
> ls: cannot access /usr/lib/systemd/systemd-cgroups-agent: No such file
> or directory
>
> Now I tried killing two services that I know are under systemd cgroups:
> cat  /sys/fs/cgroup/systemd/system/bluetooth.service/tasks
> 671
>
> Apr 16 20:40:05 localhost systemd[1]: bluetooth.service: main process
> exited, code=killed, status=9/KILL
> Apr 16 20:40:05 localhost systemd[1]: Unit bluetooth.service entered
> failed state
>
> And with mcelog it was the same:
>
> ...
> Apr 16 20:33:46 localhost systemd[1]: mcelog.service: main process
> exited, code=killed, status=9/KILL
> Apr 16 20:33:46 localhost systemd[1]: Unit mcelog.service entered failed state
> ...
>
> both folders, bluetooth.service and mcelog.service (under
>   /sys/fs/cgroup/systemd/system/) were removed.
>
> How come ? could it be that the messages to the DBus are not sent
> by systemd-cgroups-agent?

In these two cases it was sufficient for systemd to receive the SIGCHLD 
signal to detect the death of the service. But this won't work for every 
service.

Michal