On 28/03/2023 22:58, Lennart Poettering wrote:
On Di, 28.03.23 08:13, Stephan Bergmann (sbergman@xxxxxxxxxx) wrote:
* Is it guaranteed for system-run --scope that the wrapped command will run
in the surrounding process group? (Because LibreOffice' Jenkins relies on a
single process group for a whole `make check` to reliably kill stuck builds.
And it looks like systemd-run --scope is just a lightweight wrapper that
then exec's the command in the same process, which looks promising.)
Yes. Process groups and control groups are orthogonal. Moving a
process into a cgroup via systemd's "scope" concept won't affect
process group membership.
In fact, Linux doesn't have any API to change process group membership
from the "outside" anyway. Processes can only do this from "inside"
the process. Hence even if we wanted, we couln't affect that.
(My concern was that the implementation of `systemd-run --scope` might
call something like `setpgid(getpid(), getpid())` to establish a new
process group, which would then be inherited by the fork'ed or exec'ed
command.)
