From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1N13Wh-0005cN-DK
	for qemu-devel@nongnu.org; Thu, 22 Oct 2009 15:40:47 -0400
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1N13Wc-0005PA-8v
	for qemu-devel@nongnu.org; Thu, 22 Oct 2009 15:40:46 -0400
Received: from [199.232.76.173] (port=53619 helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1N13Wc-0005Oq-3c
	for qemu-devel@nongnu.org; Thu, 22 Oct 2009 15:40:42 -0400
Received: from mx1.redhat.com ([209.132.183.28]:41990)
	by monty-python.gnu.org with esmtp (Exim 4.60)
	(envelope-from <mtosatti@redhat.com>) id 1N13Wb-0006IW-Bf
	for qemu-devel@nongnu.org; Thu, 22 Oct 2009 15:40:41 -0400
Message-Id: <20091022193912.063620036@redhat.com>
Date: Thu, 22 Oct 2009 17:38:17 -0200
From: Marcelo Tosatti <mtosatti@redhat.com>
References: <20091022193816.147000901@redhat.com>
Content-Disposition: inline; filename=block-sigchld
Subject: [Qemu-devel] [patch 1/2] qemu: block SIGCHLD in vcpu thread(s)
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: qemu-devel@nongnu.org
Cc: glommer@redhat.com, Marcelo Tosatti <mtosatti@redhat.com>, aliguori@us.ibm.com

Otherwise a vcpu thread can run the sigchild handler causing
waitpid() from iothread to fail.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: qemu/vl.c
===================================================================
--- qemu.orig/vl.c
+++ qemu/vl.c
@@ -3722,6 +3722,7 @@ static void block_io_signals(void)
     sigaddset(&set, SIGUSR2);
     sigaddset(&set, SIGIO);
     sigaddset(&set, SIGALRM);
+    sigaddset(&set, SIGCHLD);
     pthread_sigmask(SIG_BLOCK, &set, NULL);
 
     sigemptyset(&set);