LogDog Butler: Catch SIGTERM on Linux.

client/cmd/logdog_butler/main_windows.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package main
 
 import (
         "errors"
         "fmt"
+        "os"
 
         "github.com/luci/luci-go/client/internal/logdog/butler/streamserver"
         "golang.org/x/net/context"
 )
 
 const (
         // An example stream server URI.
         //
         // This expands to: //localhost/pipe/<name>
         exampleStreamServerURI = streamServerURI("net.pipe:logdog-butler")
 )
 
+// interruptSignals is the set of signals to handle gracefully (e.g., flush,
+// shutdown).
+var interruptSignals = []os.Signal{
+        os.Interrupt,
+}
+
 type streamServerURI string
 
 func (u streamServerURI) Parse() (string, error) {
         typ, value := parseStreamServer(string(u))
         if typ != "net.pipe" {
                 return "", errors.New("Unsupported URI scheme.")
         }
 
         if value == "" {
                 return "", errors.New("cannot have empty pipe name")
         }
         return value, nil
 }
 
 // Validates that the URI is correct for Windows.
 func (u streamServerURI) Validate() error {
         _, err := u.Parse()
         return err
 }
 
 // Create a Windows stream server.
 func createStreamServer(ctx context.Context, uri streamServerURI) streamserver.StreamServer {
         name, err := uri.Parse()
         if err != nil {
                 panic("Failed to parse stream server URI.")
         }
         return streamserver.NewNamedPipeServer(ctx, fmt.Sprintf(`\\.\pipe\%s`, name))
 }