test_client fails on cygwin

[zooko]

This happens on our cygwin buildslave as well as on my cygwin on Parallels v2 on my Macbook Pro:

===============================================================================
[FAIL]: allmydata.test.test_runner.RunNode.test_client

Traceback (most recent call last):
  File "/cygdrive/c/playground/allmydata/tahoe/src/allmydata/test/test_runner.py", line 167, in _started
    self.failUnlessEqual(rc, 0, errstr)
twisted.trial.unittest.FailTest: rc=1, OUT: '', ERR: 'never saw process go away
not restarting
'

[zooko]

Okay, SIGINT doesn't cause the Python interpreter to quit under cygwin, but it does print "Keyboard Interrupt" to stdout when it receives that signal. (Could have something to do with #136 ?)

How about if do_stop() uses SIGTERM?

[zooko]

No, this can't have anything to do with #136 (i.e. with ​Twisted ticket #733) because I did this with a plain cygwin python interpreter that hadn't imported Twisted or anything else.

[zooko]

​http://twistedmatrix.com/pipermail/twisted-python/2006-May/013115.html

excerpt from that page:

Just to add more informations:
when killing a normal Python process with TERM, the Interpreter
terminates without calling the functions registered with atexit.

Now this is strange because the MSDN says that, by default, SIGTERM is
ignored and the Python documentation says that only an handler for
SIGINT is installed.

[zooko]

fixed by 93efd2902ee4626b