[lwip-devel] [bug #51531] getsockopt/SO_ERROR not returning value stored in errno

[Joel Cunningham]

URL:
  <http://savannah.nongnu.org/bugs/?51531>

                 Summary: getsockopt/SO_ERROR not returning value stored in
errno
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: jcunningham
            Submitted on: Fri 21 Jul 2017 09:29:03 PM UTC
                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: git head

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Details:

I've found that getsocktop with SO_ERROR is not returning the value stored in
errno.

The particular application case I'm working with is non-blocking connect. 
connect() returns -1 and then I call getsockopt and get 0, leading my
application to think the connection has completed early.  I then call send()
which returns with an error

I did some debugging and can see that the ERR_INPROGRESS is being returned
from lwip_netconn_do_connect() and EINPROGRESS is set in errno.  But then
getsockopt with SO_ERROR calls netconn_err(), which checks conn->pending_err. 
pending_err doesn't appear to be set in the connect path, but only from the
TCP err callback





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