[issue25789] py launcher stderr is not piped to subprocess.Popen.stderr

[Eryk Sun]

Eryk Sun added the comment:

Patch 2 additionally modifies run_child to call exit() instead of ExitProcess. 
For example:

    >>> import os, subprocess
    >>> os.environ['PYLAUNCH_DEBUG'] = '1'
    >>> p = subprocess.Popen(r'py -3 -c ""', stderr=subprocess.PIPE, 
stdout=subprocess.PIPE)
    >>> p.stderr.read()
    b''

Patched:

    >>> p = subprocess.Popen(r'amd64\py_d -3 -c ""', stderr=subprocess.PIPE, 
stdout=subprocess.PIPE)
    >>> p.stderr.readlines()[-1]
    b'child process exit code: 0\r\n'

For good measure I also added a call to setvbuf to disable buffering stderr.

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Added file: http://bugs.python.org/file41239/issue25789_2.patch

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