[issue16327] subprocess.Popen leaks file descriptors on os.fork() failure

[Charles-François Natali]

Charles-François Natali added the comment:

> The problem with using RLIMIT is that the testsuite could be executing several tests in parallel using independent threads, for instance. You don't want to influence unrelated tests.

That's why I suggested to run it in a subprocess: this is used
frequently, e.g. for signal or deadlock tests.

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<http://bugs.python.org/issue16327>
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