cmd_run.py 文件源码

def __init__(self, cmd, **kwargs):
        start_new_session = kwargs.pop('start_new_session', True)
        options = {
            'stdout': subprocess.PIPE,
            'stderr': subprocess.STDOUT,
            'shell': True,
            'bufsize': 1,
            'close_fds': not ON_WINDOWS,
        }
        options.update(**kwargs)

        if ON_WINDOWS:
            # MSDN reference:
            #   http://msdn.microsoft.com/en-us/library/windows/desktop/ms684863%28v=vs.85%29.aspx
            create_new_process_group = 0x00000200
            detached_process = 0x00000008
            #options.update(creationflags=detached_process | create_new_process_group)
            os.environ["COMSPEC"]= "powershell.exe"
        elif start_new_session:
            if sys.version_info < (3, 2):
                options.update(preexec_fn=os.setsid)
            else:
                options.update(start_new_session=True)

        super(PopenPatched, self).__init__(cmd, **options)