From 8e36812e27f70bd6e4b3b85c9e9e858b0ac0df5e Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Tue, 10 Feb 2015 14:49:32 +0100
Subject: asyncio: BaseSubprocessTransport.close() doesn't try to kill the
 process if it already finished

---
 Lib/asyncio/base_subprocess.py           |  7 +++-
 Lib/test/test_asyncio/test_subprocess.py | 55 ++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+), 1 deletion(-)

diff --git a/Lib/asyncio/base_subprocess.py b/Lib/asyncio/base_subprocess.py
index 02b9e89..5458ab1 100644
--- a/Lib/asyncio/base_subprocess.py
+++ b/Lib/asyncio/base_subprocess.py
@@ -93,7 +93,12 @@ class BaseSubprocessTransport(transports.SubprocessTransport):
                 continue
             proto.pipe.close()
 
-        if self._proc is not None and self._returncode is None:
+        if (self._proc is not None
+        # the child process finished?
+        and self._returncode is None
+        # the child process finished but the transport was not notified yet?
+        and self._proc.poll() is None
+        ):
             if self._loop.get_debug():
                 logger.warning('Close running child process: kill %r', self)
 
diff --git a/Lib/test/test_asyncio/test_subprocess.py b/Lib/test/test_asyncio/test_subprocess.py
index b467b04..de0b08a 100644
--- a/Lib/test/test_asyncio/test_subprocess.py
+++ b/Lib/test/test_asyncio/test_subprocess.py
@@ -349,6 +349,61 @@ class SubprocessMixin:
             self.loop.run_until_complete(cancel_make_transport())
             test_utils.run_briefly(self.loop)
 
+    def test_close_kill_running(self):
+        @asyncio.coroutine
+        def kill_running():
+            create = self.loop.subprocess_exec(asyncio.SubprocessProtocol,
+                                               *PROGRAM_BLOCKED)
+            transport, protocol = yield from create
+            proc = transport.get_extra_info('subprocess')
+            proc.kill = mock.Mock()
+            returncode = transport.get_returncode()
+            transport.close()
+            return (returncode, proc.kill.called)
+
+        # Ignore "Close running child process: kill ..." log
+        with test_utils.disable_logger():
+            returncode, killed = self.loop.run_until_complete(kill_running())
+        self.assertIsNone(returncode)
+
+        # transport.close() must kill the process if it is still running
+        self.assertTrue(killed)
+        test_utils.run_briefly(self.loop)
+
+    def test_close_dont_kill_finished(self):
+        @asyncio.coroutine
+        def kill_running():
+            create = self.loop.subprocess_exec(asyncio.SubprocessProtocol,
+                                               *PROGRAM_BLOCKED)
+            transport, protocol = yield from create
+            proc = transport.get_extra_info('subprocess')
+
+            # kill the process (but asyncio is not notified immediatly)
+            proc.kill()
+            proc.wait()
+
+            proc.kill = mock.Mock()
+            proc_returncode = proc.poll()
+            transport_returncode = transport.get_returncode()
+            transport.close()
+            return (proc_returncode, transport_returncode, proc.kill.called)
+
+        # Ignore "Unknown child process pid ..." log of SafeChildWatcher,
+        # emitted because the test already consumes the exit status:
+        # proc.wait()
+        with test_utils.disable_logger():
+            result = self.loop.run_until_complete(kill_running())
+            test_utils.run_briefly(self.loop)
+
+        proc_returncode, transport_return_code, killed = result
+
+        self.assertIsNotNone(proc_returncode)
+        self.assertIsNone(transport_return_code)
+
+        # transport.close() must not kill the process if it finished, even if
+        # the transport was not notified yet
+        self.assertFalse(killed)
+
 
 if sys.platform != 'win32':
     # Unix
-- 
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