From af636848622c8ad27cace63be5f9dd9aaa565502 Mon Sep 17 00:00:00 2001
From: Andrey Nering <andrey.nering@gmail.com>
Date: Mon, 23 Jan 2017 20:40:11 -0200
Subject: [PATCH] Squashed 'modules/minwinsvc/' content from commit cad6b2b

git-subtree-dir: modules/minwinsvc
git-subtree-split: cad6b2b879b0970e4245a20ebf1a81a756e2bb70
---
 LICENSE        | 20 +++++++++++++++
 README.md      | 18 +++++++++++++
 minwinsvc.go   | 18 +++++++++++++
 svc_other.go   | 11 ++++++++
 svc_windows.go | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 137 insertions(+)
 create mode 100644 LICENSE
 create mode 100644 README.md
 create mode 100644 minwinsvc.go
 create mode 100644 svc_other.go
 create mode 100644 svc_windows.go

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 00000000000..fce91b4e1ad
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,20 @@
+Copyright (c) 2015 Daniel Theophanes
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+   1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+
+   2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+
+   3. This notice may not be removed or altered from any source
+   distribution.
diff --git a/README.md b/README.md
new file mode 100644
index 00000000000..260dceeac32
--- /dev/null
+++ b/README.md
@@ -0,0 +1,18 @@
+### Minimal windows service stub
+
+Programs designed to run from most *nix style operating systems
+can import this package to enable running programs as services without modifying
+them.
+
+```
+import _ "github.com/kardianos/minwinsvc"
+```
+
+If you need more control over the exit behavior, set
+```
+minwinsvc.SetOnExit(func() {
+	// Do something.
+	// Within 10 seconds call:
+	os.Exit(0)
+})
+```
diff --git a/minwinsvc.go b/minwinsvc.go
new file mode 100644
index 00000000000..057ba7f9548
--- /dev/null
+++ b/minwinsvc.go
@@ -0,0 +1,18 @@
+// 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
+
+// Minimal non-invasive windows only service stub.
+//
+// Import to allow running as a windows service.
+//   import _ "github.com/kardianos/minwinsvc"
+// This will detect if running as a windows service
+// and install required callbacks for windows.
+package minwinsvc
+
+// SetOnExit sets the function to be called when the windows service
+// requests an exit. If this is not called, or if it is called where
+// f == nil, then it defaults to calling "os.Exit(0)".
+func SetOnExit(f func()) {
+	setOnExit(f)
+}
diff --git a/svc_other.go b/svc_other.go
new file mode 100644
index 00000000000..197d30021fa
--- /dev/null
+++ b/svc_other.go
@@ -0,0 +1,11 @@
+// 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
+
+func setOnExit(f func()) {
+	// Nothing.
+}
diff --git a/svc_windows.go b/svc_windows.go
new file mode 100644
index 00000000000..91e2b6a4dd5
--- /dev/null
+++ b/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
+}