X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=man%2Fsystemd.timer.xml;h=58eaab09f84625cbb20d109067a5b5aa625bcb5b;hb=bd8f585b9996667db89764ece1cacf37672e3223;hp=9b6b486bf43f353dac6f52af7a0ec111a55f7c57;hpb=ad678a066b4ba5d8914dd7d5a4093572841205cf;p=elogind.git
diff --git a/man/systemd.timer.xml b/man/systemd.timer.xml
index 9b6b486bf..58eaab09f 100644
--- a/man/systemd.timer.xml
+++ b/man/systemd.timer.xml
@@ -9,16 +9,16 @@
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see .
-->
@@ -44,18 +44,18 @@
systemd.timer
- systemd timer configuration files
+ Timer unit configuration
- systemd.timer
+ timer.timer
Description
A unit configuration file whose name ends in
- .timer encodes information about
+ .timer encodes information about
a timer controlled and supervised by systemd, for
timer-based activation.
@@ -97,7 +97,7 @@
defines. The options specific to the [Timer] section
of timer units are the following:
-
+
OnActiveSec=
OnBootSec=
@@ -105,7 +105,7 @@
OnUnitActiveSec=
OnUnitInactiveSec=
- Defines timers
+ Defines monotonic timers
relative to different starting points:
OnActiveSec= defines a
timer relative to the moment the timer
@@ -115,7 +115,7 @@
machine was booted
up. OnStartupSec=
defines a timer relative to when
- systemd was
+ systemd was first
started. OnUnitActiveSec=
defines a timer relative to when the
unit the timer is activating was last
@@ -128,7 +128,7 @@
combined of the same and of different
types. For example, by combining
OnBootSec= and
- OnUnitActiveSec= it is
+ OnUnitActiveSec=, it is
possible to define a timer that
elapses in regular intervals and
activates a specific service each
@@ -139,9 +139,9 @@
seconds. Example: "OnBootSec=50" means
50s after boot-up. The argument may
also include time units. Example:
- "OnBootSec=5h 30min" means 5 hours and 30
- minutes after boot-up. For details
- about the syntax of time spans see
+ "OnBootSec=5h 30min" means 5 hours and
+ 30 minutes after boot-up. For details
+ about the syntax of time spans, see
systemd.unit5.
If a timer configured with
@@ -152,13 +152,86 @@
elapse and the configured unit is
started. This is not the case for
timers defined in the other
- directives.
+ directives.
These are monotonic timers,
independent of wall-clock time and timezones. If the
computer is temporarily suspended, the
monotonic clock stops too.
+ If the empty string is assigned
+ to any of these options, the list of
+ timers is reset, and all prior
+ assignments will have no
+ effect.
+
+ Note that timers do not
+ necessarily expire at the precise
+ time configured with these settings,
+ as they are subject to the
+ AccuracySec=
+ setting below.
+
+
+
+
+ OnCalendar=
+
+ Defines realtime
+ (i.e. wallclock) timers with calendar
+ event expressions. See
+ systemd.time7
+ for more information on the syntax of
+ calendar event expressions. Otherwise,
+ the semantics are similar to
+ OnActiveSec= and
+ related settings.
+
+ Note that timers do not
+ necessarily expire at the precise
+ time configured with this setting,
+ as it is subject to the
+ AccuracySec=
+ setting below.
+
+
+
+ AccuracySec=
+
+ Specify the accuracy
+ the timer shall elapse with. Defaults
+ to 1min. The timer is scheduled to
+ elapse within a time window starting
+ with the time specified in
+ OnCalendar=,
+ OnActiveSec=,
+ OnBootSec=,
+ OnStartupSec=,
+ OnUnitActiveSec= or
+ OnUnitInactiveSec=
+ and ending the time configured with
+ AccuracySec=
+ later. Within this time window, the
+ expiry time will be placed at a
+ host-specific, randomized but stable
+ position that is synchronized between
+ all local timer units. This is done in
+ order to distribute the wake-up time
+ in networked installations, as well as
+ optimizing power consumption to
+ suppress unnecessary CPU wake-ups. To
+ get best accuracy, set this option to
+ 1us. Note that the timer is still
+ subject to the timer slack configured
+ via
+ systemd-system.conf5's
+ TimerSlackNSec=
+ setting. See
+ prctl2
+ for details. To optimize power
+ consumption, make sure to set this
+ value as high as possible and as low
+ as necessary.
Unit=
@@ -166,7 +239,7 @@
The unit to activate
when this timer elapses. The argument is a
unit name, whose suffix is not
- .timer. If not
+ .timer. If not
specified, this value defaults to a
service that has the same name as the
timer unit, except for the
@@ -176,6 +249,45 @@
are named identically, except for the
suffix.
+
+
+
+ Persistent=
+
+ Takes a boolean
+ argument. If true the service unit is
+ immediately triggered when the timer
+ unit is activated and the timer
+ elapsed at least once since the last
+ time the service unit has been
+ triggered by the timer unit. The time
+ when the service unit was last
+ triggered is stored on disk. This is
+ useful to catch up for missed timers
+ when a machine is shutdown temporarily
+ and then is powered up again. Note
+ that this setting only has an effect
+ on timers configured with
+ OnCalendar=.
+
+
+
+
+ WakeSystem=
+
+ Takes a boolean
+ argument. If true an elapsing timer
+ will cause the system to resume from
+ suspend, should it be suspended and if
+ the system supports this. Note that
+ this option will only make sure the
+ system resumes on the appropriate
+ times, it will not take care of
+ suspending it again after any work
+ that is to be done is
+ finished. Defaults to
+ false.
+
@@ -185,7 +297,11 @@
systemd1,
systemctl8,
systemd.unit5,
- systemd.service5
+ systemd.service5,
+ systemd.time7,
+ systemd.directives7,
+ systemd-system.conf5,
+ prctl2