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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build windows
package mgr
import (
"syscall"
"unsafe"
"golang.org/x/sys/windows"
"golang.org/x/sys/windows/svc"
)
// Service is used to access Windows service.
type Service struct {
Name string
Handle windows.Handle
}
// Delete marks service s for deletion from the service control manager database.
func (s *Service) Delete() error {
return windows.DeleteService(s.Handle)
}
// Close relinquish access to the service s.
func (s *Service) Close() error {
return windows.CloseServiceHandle(s.Handle)
}
// Start starts service s.
// args will be passed to svc.Handler.Execute.
func (s *Service) Start(args ...string) error {
var p **uint16
if len(args) > 0 {
vs := make([]*uint16, len(args))
for i := range vs {
vs[i] = syscall.StringToUTF16Ptr(args[i])
}
p = &vs[0]
}
return windows.StartService(s.Handle, uint32(len(args)), p)
}
// Control sends state change request c to the service s. It returns the most
// recent status the service reported to the service control manager, and an
// error if the state change request was not accepted.
// Note that the returned service status is only set if the status change
// request succeeded, or if it failed with error ERROR_INVALID_SERVICE_CONTROL,
// ERROR_SERVICE_CANNOT_ACCEPT_CTRL, or ERROR_SERVICE_NOT_ACTIVE.
func (s *Service) Control(c svc.Cmd) (svc.Status, error) {
var t windows.SERVICE_STATUS
err := windows.ControlService(s.Handle, uint32(c), &t)
if err != nil &&
err != windows.ERROR_INVALID_SERVICE_CONTROL &&
err != windows.ERROR_SERVICE_CANNOT_ACCEPT_CTRL &&
err != windows.ERROR_SERVICE_NOT_ACTIVE {
return svc.Status{}, err
}
return svc.Status{
State: svc.State(t.CurrentState),
Accepts: svc.Accepted(t.ControlsAccepted),
}, err
}
// Query returns current status of service s.
func (s *Service) Query() (svc.Status, error) {
var t windows.SERVICE_STATUS_PROCESS
var needed uint32
err := windows.QueryServiceStatusEx(s.Handle, windows.SC_STATUS_PROCESS_INFO, (*byte)(unsafe.Pointer(&t)), uint32(unsafe.Sizeof(t)), &needed)
if err != nil {
return svc.Status{}, err
}
return svc.Status{
State: svc.State(t.CurrentState),
Accepts: svc.Accepted(t.ControlsAccepted),
ProcessId: t.ProcessId,
Win32ExitCode: t.Win32ExitCode,
ServiceSpecificExitCode: t.ServiceSpecificExitCode,
}, nil
}
// ListDependentServices returns the names of the services dependent on service s, which match the given status.
func (s *Service) ListDependentServices(status svc.ActivityStatus) ([]string, error) {
var bytesNeeded, returnedServiceCount uint32
var services []windows.ENUM_SERVICE_STATUS
for {
var servicesPtr *windows.ENUM_SERVICE_STATUS
if len(services) > 0 {
servicesPtr = &services[0]
}
allocatedBytes := uint32(len(services)) * uint32(unsafe.Sizeof(windows.ENUM_SERVICE_STATUS{}))
err := windows.EnumDependentServices(s.Handle, uint32(status), servicesPtr, allocatedBytes, &bytesNeeded,
&returnedServiceCount)
if err == nil {
break
}
if err != syscall.ERROR_MORE_DATA {
return nil, err
}
if bytesNeeded <= allocatedBytes {
return nil, err
}
// ERROR_MORE_DATA indicates the provided buffer was too small, run the call again after resizing the buffer
requiredSliceLen := bytesNeeded / uint32(unsafe.Sizeof(windows.ENUM_SERVICE_STATUS{}))
if bytesNeeded%uint32(unsafe.Sizeof(windows.ENUM_SERVICE_STATUS{})) != 0 {
requiredSliceLen += 1
}
services = make([]windows.ENUM_SERVICE_STATUS, requiredSliceLen)
}
if returnedServiceCount == 0 {
return nil, nil
}
// The slice mutated by EnumDependentServices may have a length greater than returnedServiceCount, any elements
// past that should be ignored.
var dependents []string
for i := 0; i < int(returnedServiceCount); i++ {
dependents = append(dependents, windows.UTF16PtrToString(services[i].ServiceName))
}
return dependents, nil
}