логика состояния сна системы (System sleep state logic)
Имя (Name)
systemd-suspend.service, systemd-hibernate.service, systemd-
hybrid-sleep.service, systemd-suspend-then-hibernate.service,
systemd-sleep - System sleep state logic
Синопсис (Synopsis)
systemd-suspend.service
systemd-hibernate.service
systemd-hybrid-sleep.service
systemd-suspend-then-hibernate.service
/usr/lib/systemd/system-sleep
Описание (Description)
systemd-suspend.service is a system service that is pulled in by
suspend.target and is responsible for the actual system suspend.
Similarly, systemd-hibernate.service is pulled in by
hibernate.target to execute the actual hibernation. Finally,
systemd-hybrid-sleep.service is pulled in by hybrid-sleep.target
to execute hybrid hibernation with system suspend and pulled in
by suspend-then-hibernate.target to execute system suspend with a
timeout that will activate hibernate later.
Immediately before entering system suspend and/or hibernation
systemd-suspend.service (and the other mentioned units,
respectively) will run all executables in
/usr/lib/systemd/system-sleep/ and pass two arguments to them.
The first argument will be "pre", the second either "suspend",
"hibernate", "hybrid-sleep", or "suspend-then-hibernate"
depending on the chosen action. An environment variable called
"SYSTEMD_SLEEP_ACTION" will be set and contain the sleep action
that is processing. This is primarily helpful for
"suspend-then-hibernate" where the value of the variable will be
"suspend", "hibernate", or "suspend-after-failed-hibernate" in
cases where hibernation has failed. Immediately after leaving
system suspend and/or hibernation the same executables are run,
but the first argument is now "post". All executables in this
directory are executed in parallel, and execution of the action
is not continued until all executables have finished.
Note that scripts or binaries dropped in
/usr/lib/systemd/system-sleep/ are intended for local use only
and should be considered hacks. If applications want to react to
system suspend/hibernation and resume, they should rather use the
Inhibitor interface
Note that systemd-suspend.service, systemd-hibernate.service,
systemd-hybrid-sleep.service, and
systemd-suspend-then-hibernate.service should never be executed
directly. Instead, trigger system sleep with a command such as
systemctl suspend or systemctl hibernate.
Internally, this service will echo a string like "mem" into
/sys/power/state, to trigger the actual system suspend. What
exactly is written where can be configured in the [Sleep] section
of /etc/systemd/sleep.conf or a sleep.conf.d file. See
systemd-sleep.conf(5).
Параметры (Options)
systemd-sleep understands the following commands:
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
suspend, hibernate, suspend-then-hibernate, hybrid-sleep
Suspend, hibernate, suspend then hibernate, or put the system
to hybrid sleep.
Смотри также (See also)
systemd-sleep.conf(5), systemd(1), systemctl(1),
systemd.special(7), systemd-halt.service(8)
Примечание (Note)
1. Inhibitor interface
https://www.freedesktop.org/wiki/Software/systemd/inhibit
