From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52012) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eEYNh-000088-VU for qemu-devel@nongnu.org; Tue, 14 Nov 2017 05:23:53 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eEYNe-0003In-Q9 for qemu-devel@nongnu.org; Tue, 14 Nov 2017 05:23:49 -0500 Received: from mx1.redhat.com ([209.132.183.28]:45064) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eEYNe-0003I9-Jv for qemu-devel@nongnu.org; Tue, 14 Nov 2017 05:23:46 -0500 From: Amador Pahim Date: Tue, 14 Nov 2017 11:22:43 +0100 Message-Id: <20171114102246.22221-6-apahim@redhat.com> In-Reply-To: <20171114102246.22221-1-apahim@redhat.com> References: <20171114102246.22221-1-apahim@redhat.com> Subject: [Qemu-devel] [PATCH v11 5/8] 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, muriloo@linux.vnet.ibm.com, armbru@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 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 7bd10b1a1d..d3824a7a0b 100644 --- a/scripts/qemu.py +++ b/scripts/qemu.py @@ -149,12 +149,12 @@ 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(): -- 2.13.6