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pid1: add ability to kill processes in a subgroup of a unit

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This is useful for things like machined, where the system machined wants
to manage a machine owned by the user somewhere down the tree.
This commit is contained in:
Lennart Poettering
2025-07-08 03:14:53 +02:00
parent 9afe65d974
commit 0f23564ad4
11 changed files with 183 additions and 50 deletions
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man/systemctl.xml
+9 -8
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@@ -2481,14 +2481,15 @@ Jan 12 10:46:45 example.com bluetoothd[8900]: gatt-time-server: Input/output err
<listitem>
<para>When used with <command>kill</command>, choose which processes to send a UNIX process signal
to. Must be one of <option>main</option>, <option>control</option> or <option>all</option> to
select whether to kill only the main process, the control process or all processes of the unit. The
main process of the unit is the one that defines the life-time of it. A control process of a unit
is one that is invoked by the manager to induce state changes of it. For example, all processes
started due to the <varname>ExecStartPre=</varname>, <varname>ExecStop=</varname> or
<varname>ExecReload=</varname> settings of service units are control processes. Note that there is
only one control process per unit at a time, as only one state change is executed at a time. For
services of type <varname>Type=forking</varname>, the initial process started by the manager for
to. Must be one of <option>main</option>, <option>control</option>, <option>cgroup</option> or
<option>all</option> to select whether to kill only the main process, the control process, all
processes in the unit's control group or all processes of the unit. The main process of the unit is
the one that defines the life-time of it. A control process of a unit is one that is invoked by the
manager to induce state changes of it. For example, all processes started due to the
<varname>ExecStartPre=</varname>, <varname>ExecStop=</varname> or <varname>ExecReload=</varname>
settings of service units are control processes. Note that there is only one control process per
unit at a time, as only one state change is executed at a time. For services of type
<varname>Type=forking</varname>, the initial process started by the manager for
<varname>ExecStart=</varname> is a control process, while the process ultimately forked off by that
one is then considered the main process of the unit (if it can be determined). This is different
for service units of other types, where the process forked off by the manager for