Merge commit 'af636848622c8ad27cace63be5f9dd9aaa565502' as 'modules/minwinsvc'

modules/minwinsvc/svc_windows.go

@@ -0,0 +1,70 @@
+// Copyright 2015 Daniel Theophanes.
+// Use of this source code is governed by a zlib-style
+// license that can be found in the LICENSE file.package service
+
+//+build windows
+
+package minwinsvc
+
+import (
+	"os"
+	"sync"
+
+	"golang.org/x/sys/windows/svc"
+)
+
+var (
+	onExit func()
+	guard  sync.Mutex
+)
+
+func init() {
+	interactive, err := svc.IsAnInteractiveSession()
+	if err != nil {
+		panic(err)
+	}
+	if interactive {
+		return
+	}
+	go func() {
+		_ = svc.Run("", runner{})
+
+		guard.Lock()
+		f := onExit
+		guard.Unlock()
+
+		// Don't hold this lock in user code.
+		if f != nil {
+			f()
+		}
+		// Make sure we exit.
+		os.Exit(0)
+	}()
+}
+
+func setOnExit(f func()) {
+	guard.Lock()
+	onExit = f
+	guard.Unlock()
+}
+
+type runner struct{}
+
+func (runner) Execute(args []string, r <-chan svc.ChangeRequest, changes chan<- svc.Status) (bool, uint32) {
+	const cmdsAccepted = svc.AcceptStop | svc.AcceptShutdown
+	changes <- svc.Status{State: svc.StartPending}
+
+	changes <- svc.Status{State: svc.Running, Accepts: cmdsAccepted}
+	for {
+		c := <-r
+		switch c.Cmd {
+		case svc.Interrogate:
+			changes <- c.CurrentStatus
+		case svc.Stop, svc.Shutdown:
+			changes <- svc.Status{State: svc.StopPending}
+			return false, 0
+		}
+	}
+
+	return false, 0
+}