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The Control Handler Function
Each service has a control handler, the Handler function, that is invoked by the control dispatcher when the service process
receives a control request from a service control program. Therefore, this
function executes in the context of the control dispatcher.
Whenever the Handler function is invoked, the service must call the SetServiceStatus function to report its status to the SCM. This must be done regardless of
whether the status changed.
The service control program send control requests using the ControlService function. All services must accept and process the
SERVICE_CONTROL_INTERROGATE control code. You can enable or disable acceptance of the other standard
control codes by calling SetServiceStatus. Services can also handle additional user-defined control codes.
The control handler must return within 30 seconds, or the SCM will return an
error. If a service needs to do lengthy processing when the service is executing
the control handler, it should create a secondary thread to perform the
lengthy processing, then return. This prevents the service from tying up the control
dispatcher. For example, when handling the stop request for a service that will
take a long time, create another thread to handle the stop process. The
control handler should simply call SetServiceStatus with the SERVICE_STOP_PENDING message and return.
When the user shuts down the system, all control handlers receive the
SERVICE_CONTROL_SHUTDOWN control code. They are notified in the order that they appear
in the database of installed services. By default, a service has approximately
20 seconds to perform cleanup tasks before the system shuts down. However, if
the system is left in the shutdown state (not restarted or powered down) the
service continues to run. You can change the time the system will wait for service
shutdown by modifying the WaitToKillServiceTimeout value in the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
For more information, see Writing a Control Handler Function.
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