[lwip-devel] [bug #45109] recv() with flags=MSG_PEEK consumes data

[Christopher Pow]

URL:
  <http://savannah.nongnu.org/bugs/?45109>

                 Summary: recv() with flags=MSG_PEEK consumes data
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: cpow
            Submitted on: Fri 15 May 2015 01:16:54 PM GMT
                Category: sockets/netconn
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: 1.4.0

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Details:

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 of
https://savannah.nongnu.org/patch/?5049]. 

But subsequent calls to recv without MSG_PEEK do not return the same data.

It is as though recv() is consuming the receivable data even if
flags=MSG_PEEK.




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