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select doesn't work on stdout/stderr in Windows. We'll need to move to asyncio, I believe.

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Originally posted by @axiezai in https://github.com/nipy/nipype/issues/2509#issuecomment-733974431

I just pointed the dcm2niix example to an empty directory, with the updated installation you suggested:

{'commit_hash': '0dbcedda8',
 'commit_source': 'installation',
 'networkx_version': '2.5',
 'nibabel_version': '3.2.0',
 'nipype_version': '1.6.0-dev',
 'numpy_version': '1.19.4',
 'pkg_path': 'C:\\Users\\Xihe\\anaconda3\\envs\\nipype_test\\lib\\site-packages\\nipype',
 'scipy_version': '1.5.4',
 'sys_executable': 'C:\\Users\\Xihe\\anaconda3\\envs\\nipype_test\\python.exe',
 'sys_platform': 'win32',
 'sys_version': '3.8.5 (default, Sep  3 2020, 21:29:08) [MSC v.1916 64 bit '
                '(AMD64)]',
 'traits_version': '6.1.1'}

Here's the code I used:

from nipype.interfaces.dcm2nii import Dcm2niix

converter = Dcm2niix()
converter.inputs.source_dir = 'C:/Users/Xihe/Documents/nipype_testing/'
converter.inputs.compression = 5
converter.inputs.output_dir = 'C:/Users/Xihe/Documents/nipype_testing/'
converter.run()

The directory has no dicom images so I expect the following msg:

Error: Unable to find any DICOM images in /mnt/c/Users/Xihe/Downloads (or subfolders 5 deep) 
Return code: 2 

Which is what happens on my ubuntu subsystem on the same windows machine I'm testing on.

But in Windows Anaconda installation I am now getting:

---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
<ipython-input-8-e1d471e9c2ab> in <module>
----> 1 converter.run()

~\anaconda3\envs\nipype_test\lib\site-packages\nipype\interfaces\base\core.py in run(self, cwd, ignore_exception, **inputs)
    432         try:
    433             runtime = self._pre_run_hook(runtime)
--> 434             runtime = self._run_interface(runtime)
    435             runtime = self._post_run_hook(runtime)
    436             outputs = self.aggregate_outputs(runtime)

~\anaconda3\envs\nipype_test\lib\site-packages\nipype\interfaces\dcm2nii.py in _run_interface(self, runtime)
    442     def _run_interface(self, runtime):
    443         # may use return code 1 despite conversion
--> 444         runtime = super(Dcm2niix, self)._run_interface(
    445             runtime, correct_return_codes=(0, 1,)
    446         )

~\anaconda3\envs\nipype_test\lib\site-packages\nipype\interfaces\base\core.py in _run_interface(self, runtime, correct_return_codes)
    825             else "<skipped>"
    826         )
--> 827         runtime = run_command(runtime, output=self.terminal_output)
    828         if runtime.returncode is None or runtime.returncode not in correct_return_codes:
    829             self.raise_exception(runtime)

~\anaconda3\envs\nipype_test\lib\site-packages\nipype\utils\subprocess.py in run_command(runtime, output, timeout)
    135         while proc.returncode is None:
    136             proc.poll()
--> 137             _process()
    138 
    139         _process(drain=1)

~\anaconda3\envs\nipype_test\lib\site-packages\nipype\utils\subprocess.py in _process(drain)
    122         def _process(drain=0):
    123             try:
--> 124                 res = select.select(streams, [], [], timeout)
    125             except select.error as e:
    126                 iflogger.info(e)

OSError: [WinError 10038] An operation was attempted on something that is not a socket

Not sure if this is a separate issue or something weird going on with my old laptop