Add two network utility methods to ServerPool

Will be used by Airplay and RAOP

mythtv/libs/libmythbase/serverpool.cpp

@@ -534,6 +534,72 @@ void ServerPool::newUdpDatagram(void)
     }
 }
 
+/**
+ * tryListeningPort
+ *
+ * Description:
+ * Tells the server to listen for incoming connections on port port.
+ * The server will attempt to listen on all local interfaces.
+ *
+ * Usage:
+ * baseport: port to listen on.
+ * range:    range of ports to try (default 1)
+ *
+ * Returns port used on success; otherwise returns -1.
+ */
+int ServerPool::tryListeningPort(int baseport, int range)
+{
+    // try a few ports in case the first is in use
+    int port = baseport;
+    while (port < baseport + range)
+    {
+        if (listen(port))
+        {
+            break;
+        }
+        port++;
+    }
+
+    if (port >= baseport + range)
+    {
+        return -1;
+    }
+    return port;
+}
+
+/**
+ * tryBindingPort
+ *
+ * Description:
+ * Binds this socket for incoming connections on port port.
+ * The socket will attempt to bind on all local interfaces.
+ *
+ * Usage:
+ * baseport: port to bind to.
+ * range:    range of ports to try (default 1)
+ *
+ * Returns port used on success; otherwise returns -1.
+ */
+int ServerPool::tryBindingPort(int baseport, int range)
+{
+    // try a few ports in case the first is in use
+    int port = baseport;
+    while (port < baseport + range)
+    {
+        if (bind(port))
+        {
+            break;
+        }
+        port++;
+    }
+
+    if (port >= baseport + range)
+    {
+        return -1;
+    }
+    return port;
+}
+
 /**
  * tryListeningPort
  *

mythtv/libs/libmythbase/serverpool.h

@@ -78,6 +78,8 @@ class MBASE_PUBLIC ServerPool : public QObject
 
     void close(void);
 
+    int tryListeningPort(int baseport, int range = 1);
+    int tryBindingPort(int baseport, int range = 1);
     // Utility functions
     static int tryListeningPort(QTcpServer *server, int baseport,
                                 int range = 1, bool *isipv6 = NULL);