[ECOS] Only return EWOULDBLOCK if no data moved

[Roland Caßebohm]

Hello,

both TCP/IP stacks could return EWOULDBLOCK even if there are data moved
in some cases.
My first solution was the attached patch, but maybe it is better to fix
the problem in the stacks it self?

I have seen there was a semilar problem in the serial driver:

2003-03-20  Gary Thomas  <gary@mlbassoc.com>

        * src/common/serial.c: Only return -EAGAIN if no data moved.

The attached patch would fix it for all possible places where something
like this could happen.

Any suggestions?

Roland
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