From 1c6c4273c9ab1a4a7444f5832f23784addd559df Mon Sep 17 00:00:00 2001
From: Manuel de Brito Fontes <aledbf@gmail.com>
Date: Sun, 9 Apr 2017 13:58:03 -0300
Subject: [PATCH] Avoid child processes

---
 controllers/nginx/pkg/cmd/controller/main.go | 23 ++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/controllers/nginx/pkg/cmd/controller/main.go b/controllers/nginx/pkg/cmd/controller/main.go
index c35d808a7..6e51880fd 100644
--- a/controllers/nginx/pkg/cmd/controller/main.go
+++ b/controllers/nginx/pkg/cmd/controller/main.go
@@ -28,6 +28,14 @@ import (
 )
 
 func main() {
+	callback := func(pid int, wstatus syscall.WaitStatus) {
+		glog.V(2).Infof("removing child process pid %d, wstatus: %+v\n", pid, wstatus)
+	}
+
+	sig := make(chan os.Signal, 1024)
+	signal.Notify(sig, syscall.SIGCHLD)
+	go reapChildren(sig, callback)
+
 	// start a new nginx controller
 	ngx := newNGINXController()
 	// create a custom Ingress controller using NGINX as backend
@@ -58,3 +66,18 @@ func handleSigterm(ic *controller.GenericController) {
 	glog.Infof("Exiting with %v", exitCode)
 	os.Exit(exitCode)
 }
+
+func reapChildren(signal chan os.Signal, callback func(int, syscall.WaitStatus)) {
+	for {
+		<-signal
+		for {
+			var status syscall.WaitStatus
+			pid, _ := syscall.Wait4(-1, &status, 0, nil)
+			if pid <= 0 {
+				break
+			}
+			callback(pid, status)
+			break
+		}
+	}
+}