LogDog Butler: Catch SIGTERM on Linux.

client/cmd/logdog_butler/main.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"
         "flag"
         "fmt"
@@ skipping 241 matching lines @@
                 if err != nil {
                         log.WithError(err).Errorf(a, "Failed to generate user prefix.")
                         return configErrorReturnCode
                 }
                 a.prefix = prefix
         }
 
         // Signal handler to catch 'Control-C'. This will gracefully shutdown the
         // butler the first time a signal is received. It will die abruptly if the
         // signal continues to be received.
+        //
+        // The specific signals used here are OS-specific.
         a.ncCtx = a.Context
         a.Context, a.cancelFunc = context.WithCancel(a.Context)
         signalC := make(chan os.Signal, 1)
-        signal.Notify(signalC, os.Interrupt)
+        signal.Notify(signalC, interruptSignals...)
         go func() {
                 signalled := false
                 for range signalC {
                         if !signalled {
                                 signalled = true
 
                                 // First '^C'; soft-terminate
                                 log.Infof(a, "Flushing in response to Control-C (keyboard interrupt). Interrupt again for immediate exit.")
                                 a.cancelFunc()
                         } else {
@@ skipping 34 matching lines @@
 
         paniccatcher.Do(func() {
                 rc = mainImpl(ctx, os.Args[1:])
         }, func(p *paniccatcher.Panic) {
                 log.Fields{
                         "panic.error": p.Reason,
                 }.Errorf(ctx, "Panic caught in main:\n%s", p.Stack)
                 rc = runtimeErrorReturnCode
         })
 }