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POpython os.mkfifo() for Windows
 

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  1. POpython os.mkfifo() for Windows
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    <p>Short version (if you can answer the short version it does the job for me, the rest is mainly for the benefit of other people with a similar task):</p> <p>In python in Windows, I want to create 2 file objects, attached to the same file (it doesn't have to be an actual file on the hard-drive), one for reading and one for writing, such that if the reading end tries to read it will never get EOF (it will just block until something is written). I think in linux os.mkfifo() would do the job, but in Windows it doesn't exist. What can be done? (I must use file-objects).</p> <p>Some extra details: I have a python module (not written by me) that plays a certain game through stdin and stdout (using raw_input() and print). I also have a Windows executable playing the same game, through stdin and stdout as well. I want to make them play one against the other, and log all their communication.</p> <p>Here's the code I can write (the <code>get_fifo()</code> function is not implemented, because that's what I don't know to do it Windows):</p> <pre><code>class Pusher(Thread): def __init__(self, source, dest, p1, name): Thread.__init__(self) self.source = source self.dest = dest self.name = name self.p1 = p1 def run(self): while (self.p1.poll()==None) and\ (not self.source.closed) and (not self.source.closed): line = self.source.readline() logging.info('%s: %s' % (self.name, line[:-1])) self.dest.write(line) self.dest.flush() exe_to_pythonmodule_reader, exe_to_pythonmodule_writer =\ get_fifo() pythonmodule_to_exe_reader, pythonmodule_to_exe_writer =\ get_fifo() p1 = subprocess.Popen(exe, shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE) old_stdin = sys.stdin old_stdout = sys.stdout sys.stdin = exe_to_pythonmodule_reader sys.stdout = pythonmodule_to_exe_writer push1 = Pusher(p1.stdout, exe_to_pythonmodule_writer, p1, '1') push2 = Pusher(pythonmodule_to_exe_reader, p1.stdin, p1, '2') push1.start() push2.start() ret = pythonmodule.play() sys.stdin = old_stdin sys.stdout = old_stdout </code></pre>
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    1. COhave you tried to drop `get_fifo()` and connect `pythonmodule` with the windows executable directly: `sys.stdin, sys.stdout = p1.stdout, p1.stdin`. Everything `print`ed by `pythonmodule` is written to `p1.stdin` and `raw_input()` reads from `p1.stdout` in this case. If it fails due to buffering issues on the Python side; try to run the script with unbuffered stdin/stdout: `python -u your_script.py` and add `bufsize=0` argument to `Popen`.
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