Leonardo Francalanci added the comment:
I have a workaround, and I guess this means there's a bug in the current
implementation of stdout/stderr=subprocess.PIPE; if I open my own pipes instead
of using subprocess.PIPE everything seems to work (provided I close the pipe
before reading from it):
(errPipeR, errPipeW) = os.pipe();
(outPipeR, outPipeW) = os.pipe();
proc = subprocess.Popen(proc_str,
stdin=subprocess.PIPE,
stderr=errPipeW,
stdout=outPipeW,shell=False,
universal_newlines=True)
proc.communicate(timeout=20)
os.close(outPipeW)
os.close(errPipeW)
Now I can read from the "R" pipes with 0 problems (getting the error and output
streams), and proc.communicate exits as soon as the called process exits (4
seconds).
So, since I can use my own pipes without any problems, I don't see why the
regular "subprocess.PIPE" shouldn't be working...
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<https://bugs.python.org/issue31447>
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