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[lwip-devel] [bug #49725] send-timeout: netwonn_write() can return ERR_O


From: Simon Goldschmidt
Subject: [lwip-devel] [bug #49725] send-timeout: netwonn_write() can return ERR_OK without all bytes being written
Date: Mon, 28 Nov 2016 11:43:19 +0000 (UTC)
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36

URL:
  <http://savannah.nongnu.org/bugs/?49725>

                 Summary: send-timeout: netwonn_write() can return ERR_OK
without all bytes being written
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: goldsimon
            Submitted on: Mon 28 Nov 2016 11:43:17 AM GMT
                Category: sockets/netconn
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: In Progress
                 Privacy: Public
             Assigned to: goldsimon
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head

    _______________________________________________________

Details:

As nonblocking netconns, write-timeout can write partly (e.g. write(10) can
return with 5 bytes written on timeout).

However, netconn_write() (or netconn_write_partly() without a 'bytes_written'
pointer set) has to return ERR_OK here (as ERR_WOULDBLOCK means nothing has
been sent).

As a consequence, netconn_write() cannot be used with send-timeout and a check
for this has to be added to netconn_write_partly() (just as for nonblocking
netconns).




    _______________________________________________________

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