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API description for shutdown
Almost all code related to shutdown is stored under
/usr/share/vdr/shutdown/
=================
= wakeup-modules:
=================
Wakeup-modules are named wakeup-${NAME}.sh
The used wakeup-module is selected by WAKEUP_METHOD in /etc/conf.d/vdr.shutdown.
Here rtc and nvram is tried by default if nothing has been set.
The module is sourced by the shell. The wakeup-module is executed as user root.
The Main part of the wakeup-module:
A wakeup-module should just set the time provided in the variable VDR_WAKEUP_TIME its main part.
It gets the time in Unix-Format (Seconds since 1970-01-01 UTC)
and should do whatever necessary
to let the system be up at that time.
Return values:
= 0 - success
!= 0 - failure
Usable functions:
void error_mesg(string message)
Sets an error message
void set_reboot_needed(void)
Call in wakeup_set when you need to reboot
for setting the time.
Example:
if [ ! -x needed_program ]; then
error_mesg "no wakeup-driver installed"
return 1
fi
pass_wakeup_time_to_hardware "${1}"
=====================
= pre-shutdown-hooks:
=====================
It is possible to insert code in the shutdown-procedure.
Most time this will be used to check for conditions which should
prevent a shutdown.
Usable functions:
bool is_auto_shutdown(void)
Returns true if this shutdown is triggered by minuserinactivity or after a timer-recording
bool is_user_shutdown(void)
Returns true if this shutdown is triggered by the user pressing on power.
void shutdown_abort(string message)
Forces shutdown to abort and sets a message why it must be aborted.
void shutdown_abort_can_force(string message)
Same function as shutdown_abort. Shutdown is aborted.
But if user presses the power-button again inside a minute (configurable) then shutdown
is forced meaning this condition will not stop shutdown then.
void shutdown_abort_exit(string message)
For special cases!
Immediately exit shutdown-process with exitcode 1.
bool is_forced_shutdown(void)
Returns true if this shutdown has been forced in the sense of shutdown_abort_can_force.
void disable_auto_retry(void)
Disables the auto-retry of a failed shutdown. Most times only for internal usage.
void set_retry_time(int time_minutes)
Tells shutdown-script to retry not before time_minutes minutes.
===============================
= storage-format for tmp-files:
===============================
Tmp-files for shutdown are stored under /var/lib/vdr/shutdown-data
All stored times are unix-timestamps
$datadir/shutdown-need-reboot:
stores time a wakeup-method requested to reboot
Is then compared to the uptime of the system.
$datadir/shutdown-time-written
stores the time a wakeup-time was written to the
hardware.
$datadir/last-shutdown-abort
stores the time whenever a shutdown is aborted because
of some pre-shutdown hooks and the tests can be forced
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