runtime: fix exit status when killed by signal

Previously, when a program died because of a SIGHUP, SIGINT, or SIGTERM
signal it would exit with status 2.  This CL fixes the runtime to exit
with a status indicating that the program was killed by a signal.

Change-Id: Ic2982a2562857edfdccaf68856e0e4df532af136
Reviewed-on: https://go-review.googlesource.com/18156
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/src/runtime/testdata/testprog/signal.go b/src/runtime/testdata/testprog/signal.go
new file mode 100644
index 0000000000..ac2d3e8f6c
--- /dev/null
+++ b/src/runtime/testdata/testprog/signal.go
@@ -0,0 +1,17 @@
+// Copyright 2015 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.
+
+// +build !windows,!plan9,!nacl
+
+package main
+
+import "syscall"
+
+func init() {
+	register("SignalExitStatus", SignalExitStatus)
+}
+
+func SignalExitStatus() {
+	syscall.Kill(syscall.Getpid(), syscall.SIGTERM)
+}