[issue30404] Make stdout and stderr truly unbuffered when using -u option

[STINNER Victor]

STINNER Victor added the comment:

Hum. It has an huge impact on performances. Would it make sense to have two command line options to choose between unbuffered and line buffered?

The C setvbuf() function uses these constants:

              _IONBF unbuffered
              _IOLBF line buffered
              _IOFBF fully buffered

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30404>
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