[lwip-members] [patch #5049] Add primitive MSG_PEEK support

[Christopher Pow]

Follow-up Comment #7, patch #5049 (project lwip):

I have a user report that suggests the implementation of MSG_PEEK is not quite
correct. The data is being returned [as outlined in the second note in comment
#4]. But subsequent calls to recv without MSG_PEEK do not return the same
data. 

The problem has a software work-around, but ideally the MSG_PEEK flag would
behave differently than non-MSG_PEEK flag.

The software work-around is to call recv() with flags=MSG_PEEK and length=0.
This forces LWIP to return the number of bytes available but *not* advance
beyond them. Then subsequent calls to recv() with flags=0 actually return the
data as expected.

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