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man: document that ExecStop= needs a synchronous tool 

As requested in #199.
This commit is contained in:
Lennart Poettering 2015-06-15 12:05:26 +02:00
parent e8c5393631
commit cceb20c75c
1 changed files with 15 additions and 4 deletions
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19
man/systemd.service.xml
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@ -383,10 +383,21 @@
run, all processes remaining for a service are terminated
according to the <varname>KillMode=</varname> setting (see
<citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
If this option is not specified, the process is terminated
immediately when service stop is requested. Specifier and
environment variable substitution is supported (including
<varname>$MAINPID</varname>, see above).</para></listitem>
If this option is not specified, the process is terminated by
sending the signal specified in <varname>KillSignal=</varname>
when service stop is requested. Specifier and environment
variable substitution is supported (including
<varname>$MAINPID</varname>, see above).</para>
<para>Note that it is usually not sufficient to specify a
command for this setting that only asks the service to
terminate (for example by queuing some form of termination
signal for it), but does not wait for it to do so. Since the
remaining processes of the services are killed using
<constant>SIGKILL</constant> immediately after the command
exited this would not result in a clean stop. The specified
command should hence be a synchronous operation, not an
asynchronous one.</para></listitem>
</varlistentry>
<varlistentry>