make recyle zombie more simple

sigchld_unix.go

@@ -3,44 +3,26 @@
 package main
 
 import (
-	"log"
 	"os"
 	"os/signal"
 	"syscall"
 )
 
 func init() {
-	go reapChildren()
+	go watchChildSignal()
 }
 
-func childSignal(notify chan bool) {
+func watchChildSignal() {
 	var sigs = make(chan os.Signal, 3)
 	signal.Notify(sigs, syscall.SIGCHLD)
 
 	for {
 		<-sigs
-		select {
-		case notify <- true:
-		default:
-			// Channel full, does not matter as we wait for all children.
-		}
+		reapChildren()
 	}
 }
 
 func reapChildren() {
 	var wstatus syscall.WaitStatus
-	notify := make(chan bool, 1)
-
-	go childSignal(notify)
-
-	for {
-		pid, err := syscall.Wait4(-1, &wstatus, 0, nil)
-		for err == syscall.EINTR {
-			pid, err = syscall.Wait4(-1, &wstatus, 0, nil)
-		}
-		if err == syscall.ECHILD {
-			break
-		}
-		log.Printf("pid %d, finished, wstatus: %+v", pid, wstatus)
-	}
+	syscall.Wait4(-1, &wstatus, syscall.WNOHANG, nil)
 }