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Blocking read on pipes

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I have a problem when reading from stdin (using it as pipe) in a Python program (the sender
is written in C):

C (sender)
write(1, buffer, 4)

Python ( or

sender |

Python's read blocks the program because the written buffer length (4) is lower than the indicated
in read function (256), but when I do the same with C (read(0, buffer, 256)) it is not blocking,
returns the four bytes. That is what I need.

I've tried to flush the stdout in the sending program, but it does the same.

any ideas?


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