net/local: add local_nextconn() helper

Signed-off-by: chao.an <anchao@xiaomi.com>

net/local/local.h

@@ -255,6 +255,19 @@ FAR struct local_conn_s *local_alloc(void);
 
 void local_free(FAR struct local_conn_s *conn);
 
+/****************************************************************************
+ * Name: local_nextconn
+ *
+ * Description:
+ *   Traverse the list of allocated Local connections
+ *
+ * Assumptions:
+ *   Called from network stack logic with the network stack locked
+ *
+ ****************************************************************************/
+
+FAR struct local_conn_s *local_nextconn(FAR struct local_conn_s *conn);
+
 /****************************************************************************
  * Name: psock_local_bind
  *

net/local/local_conn.c

@@ -55,6 +55,33 @@ void local_initialize(void)
 #endif
 }
 
+/****************************************************************************
+ * Name: local_nextconn
+ *
+ * Description:
+ *   Traverse the list of listened local connections
+ *
+ * Assumptions:
+ *   This function must be called with the network locked.
+ *
+ ****************************************************************************/
+
+FAR struct local_conn_s *local_nextconn(FAR struct local_conn_s *conn)
+{
+#ifdef CONFIG_NET_LOCAL_STREAM
+  if (!conn)
+    {
+      return (FAR struct local_conn_s *)g_local_listeners.head;
+    }
+  else
+    {
+      return (FAR struct local_conn_s *)conn->lc_node.flink;
+    }
+#else
+  return NULL;
+#endif
+}
+
 /****************************************************************************
  * Name: local_alloc()
  *

net/local/local_connect.c

@@ -242,7 +242,7 @@ int psock_local_connect(FAR struct socket *psock,
 {
   FAR struct local_conn_s *client;
   FAR struct sockaddr_un *unaddr = (FAR struct sockaddr_un *)addr;
-  FAR struct local_conn_s *conn;
+  FAR struct local_conn_s *conn = NULL;
 
   DEBUGASSERT(psock && psock->s_conn);
   client = (FAR struct local_conn_s *)psock->s_conn;
@@ -256,9 +256,7 @@ int psock_local_connect(FAR struct socket *psock,
   /* Find the matching server connection */
 
   net_lock();
-  for (conn = (FAR struct local_conn_s *)g_local_listeners.head;
+  while ((conn = local_nextconn(conn)) != NULL)
-      conn;
-      conn = (FAR struct local_conn_s *)dq_next(&conn->lc_node))
     {
       /* Anything in the listener list should be a stream socket in the
        * listening state