From 07e2b4049be2f99ff3dca57b942769c017b12360 Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@golang.org>
Date: Fri, 28 Feb 2014 08:31:12 -0800
Subject: [PATCH] os: don't allow Process.Kill after Process.Release

This is a user error, but killing -1 kills everything, which
is a pretty bad failure mode.

Fixes #7434

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/70140043
---
 src/pkg/os/exec_unix.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/pkg/os/exec_unix.go b/src/pkg/os/exec_unix.go
index 848a5de8f9..1b1e3350b8 100644
--- a/src/pkg/os/exec_unix.go
+++ b/src/pkg/os/exec_unix.go
@@ -38,6 +38,9 @@ func (p *Process) signal(sig Signal) error {
 	if p.done() {
 		return errors.New("os: process already finished")
 	}
+	if p.Pid == -1 {
+		return errors.New("os: process already released")
+	}
 	s, ok := sig.(syscall.Signal)
 	if !ok {
 		return errors.New("os: unsupported signal type")
-- 
2.48.1