X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=man%2Fsystemctl.xml;h=94f238041a8a71253201c8eeab84a52d2e8d1d41;hp=b4727d973064ceaffc5ec7296573037474a1c0f7;hb=3b5b000fbc2ed6d953df2de528a50a8348afc618;hpb=0088d63151e088d62104d88f866e9eb049091c22
diff --git a/man/systemctl.xml b/man/systemctl.xml
index b4727d973..94f238041 100644
--- a/man/systemctl.xml
+++ b/man/systemctl.xml
@@ -371,11 +371,36 @@ along with systemd; If not, see .
When used with kill, choose which
- processes to kill. Must be one of ,
- or to select
- whether to kill only the main process of the unit, the
- control process or all processes of the unit. If omitted,
- defaults to .
+ processes to send a signal to. Must be one of
+ , or
+ 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
+ ExecStartPre=,
+ ExecStop= or
+ ExecReload= 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
+ Type=forking the initial process started
+ by the manager for ExecStart= 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 ExecStart= is always the main process
+ itself. A service unit consists of no or one main process,
+ no or one control process plus any number of additional
+ processes. Not all unit types manage processes of these
+ types however. For example for mount units control processes
+ are defined (which are the invocations of
+ /usr/bin/mount and
+ /usr/bin/umount), but no main process
+ is defined. If omitted, defaults to
+ .