New submission from Martin Richard:
An exception can be raised in SubprocessTransport.__init__() from
SubprocessTransport._start() - for instance because an exception is raised in
the preexec_fn callback.
In this case, the calling function never gets a reference to the transport
object, and cannot close the transport. Hence, when the object is deleted, an
"unclosed transport" ResourceWarning is always triggered.
Here is a test case showing this behavior:
import asyncio
loop = asyncio.get_event_loop()
try:
loop.run_until_complete(asyncio.create_subprocess_exec('/doesntexist'))
except FileNotFoundError:
pass
finally:
loop.close()
I propose the attached patch as a solution, which call
SubprocessTransport.close() when an exception is raised in
SubprocessTransport._start() in the constructor.
----------
components: asyncio
files: transport_close_when_exception_init.patch
keywords: patch
messages: 247746
nosy: gvanrossum, haypo, martius, yselivanov
priority: normal
severity: normal
status: open
title: asyncio.BaseSubprocessTransport triggers an unavoidable ResourceWarning
if process doesn't start
type: resource usage
versions: Python 3.4, Python 3.5
Added file:
http://bugs.python.org/file40082/transport_close_when_exception_init.patch
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<http://bugs.python.org/issue24763>
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