From 1f56046fd529c0ef9e35d26d68995c497751c54f Mon Sep 17 00:00:00 2001
From: Wladimir J. van der Laan <laanwj@gmail.com>
Date: Thu, 5 Apr 2012 20:36:27 +0200
Subject: [PATCH] Show error message instead of exception crash when unable to bind RPC port

Fixes issue #875
---
 src/bitcoinrpc.cpp    |   22 ++++++++++++++++++++++
 src/qt/bitcoingui.cpp |    4 ++++
 2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index a4a1fd4..ac20ae8 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -2161,6 +2161,10 @@ void ThreadRPCServer(void* parg)
     printf("ThreadRPCServer exiting\n");
 }
 
+#ifdef QT_GUI
+extern bool HACK_SHUTDOWN;
+#endif
+
 void ThreadRPCServer2(void* parg)
 {
     printf("ThreadRPCServer started\n");
@@ -2196,9 +2200,27 @@ void ThreadRPCServer2(void* parg)
 
     asio::io_service io_service;
     ip::tcp::endpoint endpoint(bindAddress, GetArg("-rpcport", 8332));
+#ifndef QT_GUI
     ip::tcp::acceptor acceptor(io_service, endpoint);
 
     acceptor.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
+#else
+    ip::tcp::acceptor acceptor(io_service);
+    try
+    {
+        acceptor.open(endpoint.protocol());
+        acceptor.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
+        acceptor.bind(endpoint);
+        acceptor.listen(socket_base::max_connections);
+    }
+    catch(system::system_error &e)
+    {
+        HACK_SHUTDOWN = true;
+        ThreadSafeMessageBox(strprintf(_("An error occured while setting up the RPC port %i for listening: %s"), endpoint.port(), e.what()),
+                             _("Error"), wxOK | wxMODAL);
+        return;
+    }
+#endif
 
 #ifdef USE_SSL
     ssl::context context(io_service, ssl::context::sslv23);
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 0111ebb..3433c6a 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -516,12 +516,16 @@ void BitcoinGUI::refreshStatusBar()
     setNumBlocks(clientModel->getNumBlocks());
 }
 
+bool HACK_SHUTDOWN = false;
+
 void BitcoinGUI::error(const QString &title, const QString &message, bool modal)
 {
     // Report errors from network/worker thread
     if (modal)
     {
         QMessageBox::critical(this, title, message, QMessageBox::Ok, QMessageBox::Ok);
+        if (HACK_SHUTDOWN)
+            QMetaObject::invokeMethod(QCoreApplication::instance(), "quit", Qt::QueuedConnection);
     } else {
         notificator->notify(Notificator::Critical, title, message);
     }
-- 
1.7.1