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systemctl,loginctl,machinectl: add --signal=list

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This lists numerical signal values:
$ systemctl --signal list
SIGNAL NAME
1      SIGHUP
2      SIGINT
3      SIGQUIT
...
62     SIGRTMIN+28
63     SIGRTMIN+29
64     SIGRTMIN+30

This is useful when trying to kill e.g. systemd with a specific signal number
using kill. kill doesn't accept our fancy signal names like RTMIN+4, so one
would have to calculate that value somehow. Doing
  systemctl --signal list | grep -F RTMIN+4
is a nice way of doing that.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2021-02-15 08:50:40 +01:00
parent 86beb21302
commit 97ab9dfc0d
3 changed files with 35 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
man/loginctl.xml
+8 -7
View File
@@ -334,13 +334,14 @@
<term><option>-s</option></term>
<term><option>--signal=</option></term>
<listitem><para>When used with <command>kill-session</command>
or <command>kill-user</command>, choose which signal to send
to selected processes. Must be one of the well known signal
specifiers, such as <constant>SIGTERM</constant>,
<constant>SIGINT</constant> or <constant>SIGSTOP</constant>.
If omitted, defaults to
<constant>SIGTERM</constant>.</para></listitem>
<listitem><para>When used with <command>kill-session</command> or <command>kill-user</command>,
choose which signal to send to selected processes. Must be one of the well known signal specifiers,
such as <constant>SIGTERM</constant>, <constant>SIGINT</constant> or <constant>SIGSTOP</constant>.
If omitted, defaults to <constant>SIGTERM</constant>.</para>
<para>The special value <literal>help</literal> will list the known values and the program will exit
immediately, and the special value <literal>list</literal> will list known values along with the
numerical signal numbers and the program will exit immediately.</para></listitem>
</varlistentry>
<varlistentry>
man/standard-options.xml
+2 -1
View File
@@ -73,7 +73,8 @@
<option>SIGTERM</option>.</para>
<para>The special value <literal>help</literal> will list the known values and the program will exit
immediately.</para>
immediately, and the special value <literal>list</literal> will list known values along with the
numerical signal numbers and the program will exit immediately.</para>
</listitem>
</varlistentry>
</variablelist>