rsockets: Support calling listen multiple times on same rsocket

Standard sockets allows an application to call listen() multiple
times on the same socket without error.  This allows a multi-threaded
app to call listen from all threads.

rsockets will fail the second listen call.  Modify the behavior to
match standard sockets.

Problem reported by: Sreedhar Kodali <srkodali@linux.vnet.ibm.com>

Signed-off-by: Sean Hefty <sean.hefty@intel.com>

diff --git a/src/rsocket.c b/src/rsocket.c
index 00d9a185bf01973b100e2c1ea2b41fc01a7882c2..4833810a8c91a254299d9a8e04a4a4ebb7105cb5 100644 (file)
--- a/src/rsocket.c
+++ b/src/rsocket.c
@@ -1174,9 +1174,14 @@ int rlisten(int socket, int backlog)
        rs = idm_lookup(&idm, socket);
        if (!rs)
                return ERR(EBADF);
-       ret = rdma_listen(rs->cm_id, backlog);
-       if (!ret)
-               rs->state = rs_listening;
+
+       if (rs->state != rs_listening) {
+               ret = rdma_listen(rs->cm_id, backlog);
+               if (!ret)
+                       rs->state = rs_listening;
+       } else {
+               ret = 0;
+       }
        return ret;
 }