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windows: support service PreShutdown service control signal

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This adds support for the PreShutdown signal indicating the system will
be shutting down. This allows services which need time to shutdown
gracefully to use SERVICE_ACCEPT_PRESHUTDOWN to register for
SERVICE_CONTROL_PRESHUTDOWN events.

https://docs.microsoft.com/en-us/windows/win32/api/winsvc/nc-winsvc-lphandler_function_ex?redirectedfrom=MSDN
This commit is contained in:
Lewis Waddicor
2020-09-07 20:07:23 +01:00
committed by lwaddicor
parent be1d3432aa
commit db8ea88b25
2 changed files with 7 additions and 0 deletions
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2
windows/service.go
View File

@@ -65,6 +65,7 @@ const (
SERVICE_ACCEPT_HARDWAREPROFILECHANGE = 32
SERVICE_ACCEPT_POWEREVENT = 64
SERVICE_ACCEPT_SESSIONCHANGE = 128
SERVICE_ACCEPT_PRESHUTDOWN = 256
SERVICE_CONTROL_STOP = 1
SERVICE_CONTROL_PAUSE = 2
@@ -80,6 +81,7 @@ const (
SERVICE_CONTROL_HARDWAREPROFILECHANGE = 12
SERVICE_CONTROL_POWEREVENT = 13
SERVICE_CONTROL_SESSIONCHANGE = 14
SERVICE_CONTROL_PRESHUTDOWN = 15
SERVICE_ACTIVE = 1
SERVICE_INACTIVE = 2

5
windows/svc/service.go
View File

@@ -50,6 +50,7 @@ const (
HardwareProfileChange = Cmd(windows.SERVICE_CONTROL_HARDWAREPROFILECHANGE)
PowerEvent = Cmd(windows.SERVICE_CONTROL_POWEREVENT)
SessionChange = Cmd(windows.SERVICE_CONTROL_SESSIONCHANGE)
PreShutdown = Cmd(windows.SERVICE_CONTROL_PRESHUTDOWN)
)
// Accepted is used to describe commands accepted by the service.
@@ -65,6 +66,7 @@ const (
AcceptHardwareProfileChange = Accepted(windows.SERVICE_ACCEPT_HARDWAREPROFILECHANGE)
AcceptPowerEvent = Accepted(windows.SERVICE_ACCEPT_POWEREVENT)
AcceptSessionChange = Accepted(windows.SERVICE_ACCEPT_SESSIONCHANGE)
AcceptPreShutdown = Accepted(windows.SERVICE_ACCEPT_PRESHUTDOWN)
)
// Status combines State and Accepted commands to fully describe running service.
@@ -202,6 +204,9 @@ func (s *service) updateStatus(status *Status, ec *exitCode) error {
if status.Accepts&AcceptSessionChange != 0 {
t.ControlsAccepted |= windows.SERVICE_ACCEPT_SESSIONCHANGE
}
if status.Accepts&AcceptPreShutdown != 0 {
t.ControlsAccepted |= windows.SERVICE_ACCEPT_PRESHUTDOWN
}
if ec.errno == 0 {
t.Win32ExitCode = windows.NO_ERROR
t.ServiceSpecificExitCode = windows.NO_ERROR