Charles-Francois Natali <neolo...@free.fr> added the comment:
Could you try with the attached patch ?
The problem is that subprocess silently replaces bufsize=0, so child.stdout is
actually buffered, and when you read just one byte, everything that's available
for reading is read into the python's object buffer. Then, select/poll doesn't
see the pipe as ready for reading since everything as already been read.
Mixing buffered I/O and select leads to trouble, you're right to pass
bufsize=0, but I don't know why subprocess goes out of its way and buffers it
anyway:
if bufsize == 0:
bufsize = 1 # Nearly unbuffered (XXX for now)
----------
keywords: +patch
nosy: +neologix
Added file: http://bugs.python.org/file21068/subprocess_buffer.diff
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