added support for broadcasting to UDP sockets (patch 1740266)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47126 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/gsocket.cpp

@@ -533,6 +533,8 @@ GSocket::GSocket()
   m_gui_dependent       = NULL;
   m_non_blocking        = false;
   m_reusable            = false;
+  m_broadcast           = false;
+  m_dobind              = true;
   m_timeout             = 10*60*1000;
                                 /* 10 minutes * 60 sec * 1000 millisec */
   m_establishing        = false;
@@ -903,6 +905,26 @@ bool GSocket::SetReusable()
     return false;
 }
 
+bool GSocket::SetBroadcast()
+{
+    /* socket must not be in use/already bound */
+    if (m_fd == INVALID_SOCKET) {
+        m_broadcast = true;
+        return true;
+    }
+    return false;
+}
+
+bool GSocket::DontDoBind()
+{
+    /* socket must not be in use/already bound */
+    if (m_fd == INVALID_SOCKET) {
+        m_dobind = false;
+        return true;
+    }
+    return false;
+}
+
 /* Client specific parts */
 
 /* GSocket_Connect:
@@ -1119,19 +1141,25 @@ GSocketError GSocket::SetNonOriented()
 #endif
   }
 
-  /* Bind to the local address,
-   * and retrieve the actual address bound.
-   */
-  if ((bind(m_fd, m_local->m_addr, m_local->m_len) != 0) ||
-      (getsockname(m_fd,
-                   m_local->m_addr,
-                   (WX_SOCKLEN_T *) &m_local->m_len) != 0))
+  if (m_broadcast)
   {
-    Close();
-    m_error = GSOCK_IOERR;
-    return GSOCK_IOERR;
+    setsockopt(m_fd, SOL_SOCKET, SO_BROADCAST, (const char*)&arg, sizeof(arg));
+  }
+  if (m_dobind)
+  {
+      /* Bind to the local address,
+       * and retrieve the actual address bound.
+       */
+      if ((bind(m_fd, m_local->m_addr, m_local->m_len) != 0) ||
+          (getsockname(m_fd,
+                       m_local->m_addr,
+                       (WX_SOCKLEN_T *) &m_local->m_len) != 0))
+      {
+        Close();
+        m_error = GSOCK_IOERR;
+        return GSOCK_IOERR;
+      }
   }
-
   return GSOCK_NOERROR;
 }
 
@@ -2068,6 +2096,12 @@ GSocketError GAddress_INET_SetHostName(GAddress *address, const char *hostname)
   return GSOCK_NOERROR;
 }
 
+
+GSocketError GAddress_INET_SetBroadcastAddress(GAddress *address)
+{
+  return GAddress_INET_SetHostAddress(address, INADDR_BROADCAST);
+}
+
 GSocketError GAddress_INET_SetAnyAddress(GAddress *address)
 {
   return GAddress_INET_SetHostAddress(address, INADDR_ANY);