Hirokazu Yamamoto <ocean-c...@m2.ccsnet.ne.jp> added the comment:
This OSError(5) happens when we tries to read from pty after data runs out.
So simple_test_2.py fails with same error even if we don't use io module.
Modules/posixmodule.c (posix_read) simply calls read(2) once, but io module
while avail < n:
chunk = self.raw.read(wanted)
if chunk in empty_values:
nodata_val = chunk
break
avail += len(chunk)
chunks.append(chunk)
chunk is shorter than wanted (data runs out), but not empty, so io
module's read tries to read again => error happens.
I said this is io module's bug, but now I'm not sure.
Added file: http://bugs.python.org/file13203/simple_test_2.py
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<http://bugs.python.org/issue5380>
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