From 397bf3f4a6fdddf4eb667ea3576cbcb94841e170 Mon Sep 17 00:00:00 2001
From: Tomoki Shirasawa <sira@popeye.cc.u-tokyo.ac.jp>
Date: Thu, 21 Apr 2016 20:28:36 +0900
Subject: [PATCH] wait_zombie: don't wait attached process refs #726

---
 kernel/syscall.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/syscall.c b/kernel/syscall.c
index a0c8db47..748850dc 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -294,8 +294,8 @@ static int wait_zombie(struct thread *thread, struct process *child, int *status
     }
     
 	ppid = child->ppid_parent->pid;
-	if(ppid == 1 || child->nowait)
-		return 0;
+	if(child->ppid_parent->pid != thread->proc->pid || child->nowait)
+		return child->pid;
 	request.number = __NR_wait4;
 	request.args[0] = child->pid;
 	request.args[1] = 0;