Re: subprocess.Popen(): terminate() exception

While I was scanning through Charles Nutter's blog the other week I read
http://blog.headius.com/2013/06/the-pain-of-broken-subprocess.html which
documents the brokeness inherent in ProcessBuilder which is probably
relevant to jython in that it uses ProcessBuilder in Lib/subprocess.py.
I've had a quick look around and can't spot whether or not Charles or
anyone else followed through and added an alternative to ProcessBuilder
into jnr-posix or some other library. Possibly something to keep an eye on
for replacing jython's use of ProcessBuilder.

Cheers
Indra


On 16 May 2014 08:24, Jim Baker <[email protected]> wrote:

> Sounds like a great plan for beta 4!
>
> - Jim
>
>
> On Thu, May 15, 2014 at 4:48 PM, Pekka Klärck <[email protected]> wrote:
>
>> 2014-05-12 0:57 GMT+03:00 Michael Büsch <[email protected]>:
>> >
>> > I'm using latest jython hg sources (2.7).
>> > My code uses subprocess.Popen() and eventually calls terminate() on the
>> object.
>> > This fails with the following exception:
>> >
>> >> Traceback (most recent call last):
>> >>   File "/home/mb/develop/git/awlsim/./tests/../awlsimcli", line 424,
>> in <module>
>> >>     sys.exit(main())
>> >>   File "/home/mb/develop/git/awlsim/./tests/../awlsimcli", line 420,
>> in main
>> >>     return runWithServerBackend(inputFile)
>> >>   File "/home/mb/develop/git/awlsim/./tests/../awlsimcli", line 274,
>> in runWithServerBackend
>> >>     client.shutdown()
>> >>   File "/home/mb/develop/git/awlsim/awlsim/coreserver/client.py", line
>> 115, in shutdown
>> >>     self.serverProcess.terminate()
>> >>   File "/home/mb/develop/hg/jython/dist/Lib/subprocess.py", line 1399,
>> in terminate
>> >>     _subprocess.TerminateProcess(self._handle, 1)
>> >> NameError: global name '_subprocess' is not defined
>> >
>> > This looks like a bug in the subprocess module.
>>
>> Neither 'terminate' nor 'kill' nor 'send_signal' are currently
>> supported by Jython, and I would assume that possible Popen
>> configuration parameters added in Python 2.6 or 2.7 aren't supported
>> either. I have understood that supporting everything CPython does is
>> problematic due to JVM limitations (e.g. signals aren't officially
>> supported), but it ought to be possible to implement at least 'kill'
>> by just terminating the started process via the Java API. With CPython
>> 'terminate' sends SIGTERM signal on posix, so if signals aren't
>> supported implementing it that way is not possible. Implementing
>> 'terminate' as an alias for 'kill', like CPython does on Windows,
>> ought to be a good enough workaround.
>>
>> I would love to see at least 'kill' and 'terminate' included into
>> Jython 2.7. Anyone interested to work with me getting them
>> implemented?
>>
>> Cheers,
>>     .peke
>> --
>> Agile Tester/Developer/Consultant :: http://eliga.fi
>> Lead Developer of Robot Framework :: http://robotframework.org
>>
>>
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>
>
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-- 
Indra Talip

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