From 6fb1e740c67d8940fe27883d77f0dc46431aa9b4 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Fri, 31 Jul 2015 17:49:43 +0200
Subject: Fix ResourceWarning in asyncio.BaseSubprocessTransport

Issue #24763: Fix resource warnings when asyncio.BaseSubprocessTransport
constructor fails, if subprocess.Popen raises an exception for example.

Patch written by Martin Richard, test written by me.
---
 Lib/asyncio/base_subprocess.py           |  9 +++++++--
 Lib/test/test_asyncio/test_subprocess.py | 15 +++++++++++++++
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/Lib/asyncio/base_subprocess.py b/Lib/asyncio/base_subprocess.py
index c1477b8..a6971b1 100644
--- a/Lib/asyncio/base_subprocess.py
+++ b/Lib/asyncio/base_subprocess.py
@@ -35,8 +35,13 @@ class BaseSubprocessTransport(transports.SubprocessTransport):
             self._pipes[2] = None
 
         # Create the child process: set the _proc attribute
-        self._start(args=args, shell=shell, stdin=stdin, stdout=stdout,
-                    stderr=stderr, bufsize=bufsize, **kwargs)
+        try:
+            self._start(args=args, shell=shell, stdin=stdin, stdout=stdout,
+                        stderr=stderr, bufsize=bufsize, **kwargs)
+        except:
+            self.close()
+            raise
+
         self._pid = self._proc.pid
         self._extra['subprocess'] = self._proc
 
diff --git a/Lib/test/test_asyncio/test_subprocess.py b/Lib/test/test_asyncio/test_subprocess.py
index ea85e19..d138c26 100644
--- a/Lib/test/test_asyncio/test_subprocess.py
+++ b/Lib/test/test_asyncio/test_subprocess.py
@@ -1,6 +1,7 @@
 import signal
 import sys
 import unittest
+import warnings
 from unittest import mock
 
 import asyncio
@@ -413,6 +414,20 @@ class SubprocessMixin:
         # the transport was not notified yet
         self.assertFalse(killed)
 
+    def test_popen_error(self):
+        # Issue #24763: check that the subprocess transport is closed
+        # when BaseSubprocessTransport fails
+        with mock.patch('subprocess.Popen') as popen:
+            exc = ZeroDivisionError
+            popen.side_effect = exc
+
+            create = asyncio.create_subprocess_exec(sys.executable, '-c',
+                                                    'pass', loop=self.loop)
+            with warnings.catch_warnings(record=True) as warns:
+                with self.assertRaises(exc):
+                    self.loop.run_until_complete(create)
+                self.assertEqual(warns, [])
+
 
 if sys.platform != 'win32':
     # Unix
-- 
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