[lwip-devel] [bug #49848] Non-blocking socket emit a sock error while read return EWOULDBLOCK

[Wen Xichang]

URL:
  <http://savannah.nongnu.org/bugs/?49848>

                 Summary: Non-blocking socket emit a sock error while read
return EWOULDBLOCK
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: wenxichang
            Submitted on: Thu Dec 15 10:00:27 2016
                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: None
            lwIP version: 2.0.0

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Details:

  if (netconn_is_nonblocking(sock->conn) && (sock->rcvevent <= 0)) {
    LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d): returning EWOULDBLOCK\n",
s));
    sock_set_errno(sock, EWOULDBLOCK);  <-------- shoud set errno only
    return -1;
  }

same in lwip_recvfrom function.

the behavior is diff from linux(2.6+)
(don't have other unix)






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