From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36317) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1edj3W-0004fX-Ck for qemu-devel@nongnu.org; Mon, 22 Jan 2018 15:51:03 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1edj3V-0000bK-KA for qemu-devel@nongnu.org; Mon, 22 Jan 2018 15:51:02 -0500 Received: from mx1.redhat.com ([209.132.183.28]:45702) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1edj3V-0000ap-Du for qemu-devel@nongnu.org; Mon, 22 Jan 2018 15:51:01 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 8297B4DD7C for ; Mon, 22 Jan 2018 20:51:00 +0000 (UTC) From: Amador Pahim Date: Mon, 22 Jan 2018 21:50:31 +0100 Message-Id: <20180122205033.24893-5-apahim@redhat.com> In-Reply-To: <20180122205033.24893-1-apahim@redhat.com> References: <20180122205033.24893-1-apahim@redhat.com> Subject: [Qemu-devel] [PATCH v12 4/6] qemu.py: use poll() instead of 'returncode' List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: famz@redhat.com, crosa@redhat.com, ehabkost@redhat.com, Amador Pahim The 'returncode' Popen attribute is not guaranteed to be updated. It actually depends on a call to either poll(), wait() or communicate(). On the other hand, poll() will: "Check if child process has terminated. Set and return returncode attribute." Let's use the poll() to check whether the process is running and to get the updated process exit code, when the process is finished. Reviewed-by: Fam Zheng eviewed-by: Eduardo Habkost Signed-off-by: Amador Pahim --- scripts/qemu.py | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/scripts/qemu.py b/scripts/qemu.py index d6661870ab..874ac2e424 100644 --- a/scripts/qemu.py +++ b/scripts/qemu.py @@ -151,12 +151,12 @@ class QEMUMachine(object): raise def is_running(self): - return self._popen is not None and self._popen.returncode is None + return self._popen is not None and self._popen.poll() is None def exitcode(self): if self._popen is None: return None - return self._popen.returncode + return self._popen.poll() def get_pid(self): if not self.is_running(): -- 2.14.3