- Actually fix the SIGPIPE (Broken Pipe) Error. It was caused by the QTcpSocket::flush().

- Revert previous SIGPIPE fixes.
- Rename method in RemoteClient to match its function.

src/main.cpp

@@ -104,10 +104,6 @@ using boost::scoped_ptr;
 # include "devices/wmdmthread.h"
 #endif
 
-#ifndef Q_OS_WIN32
-#include <signal.h>
-#endif
-
 // Load sqlite plugin on windows and mac.
 #ifdef HAVE_STATIC_SQLITE
 # include <QtPlugin>
@@ -410,12 +406,6 @@ int main(int argc, char *argv[]) {
   qtsparkle::LoadTranslations(language);
 #endif
 
-#ifndef Q_OS_WIN32
-  // This is needed to prevent SIGPIPE Errors, which occur under some
-  // circumstances in RemoteClient. They cause a program termination.
-  signal(SIGPIPE, SIG_IGN);
-#endif
-
   // Icons
   IconLoader::Init();
 

src/networkremote/remoteclient.cpp

@@ -35,12 +35,6 @@ RemoteClient::RemoteClient(Application* app, QTcpSocket* client)
   // Connect to the slot IncomingData when receiving data
   connect(client, SIGNAL(readyRead()), this, SLOT(IncomingData()));
 
-  // Connect the signals to see if an error occured or the client
-  // was disconnected.
-  connect(client, SIGNAL(disconnected()), this, SLOT(Disconnected()));
-  connect(client, SIGNAL(error(QAbstractSocket::SocketError)),
-          this, SLOT(Error(QAbstractSocket::SocketError)));
-
   // Check if we use auth code
   QSettings s;
 
@@ -91,7 +85,7 @@ void RemoteClient::ParseMessage(const QByteArray &data) {
 
   if (msg.type() == pb::remote::CONNECT && use_auth_code_) {
     if (msg.request_connect().auth_code() != auth_code_) {
-      DisconnectClient();
+      DisconnectClientWrongAuthCode();
       return;
     }
   }
@@ -100,7 +94,7 @@ void RemoteClient::ParseMessage(const QByteArray &data) {
   emit Parse(msg);
 }
 
-void RemoteClient::DisconnectClient() {
+void RemoteClient::DisconnectClientWrongAuthCode() {
   pb::remote::Message msg;
   msg.set_type(pb::remote::DISCONNECT);
   msg.mutable_response_disconnect()->set_reason_disconnect(pb::remote::Wrong_Auth_Code);
@@ -115,14 +109,15 @@ void RemoteClient::SendData(pb::remote::Message *msg) {
   // Serialize the message
   std::string data = msg->SerializeAsString();
 
-  // write the length of the data first
+  // Check if we are still connected
-  if (client_->isWritable()) {
+  if (client_->state() == QTcpSocket::ConnectedState) {
+    // write the length of the data first
     QDataStream s(client_);
     s << qint32(data.length());
     s.writeRawData(data.data(), data.length());
 
-    // Flush data
+    // Do NOT flush data here! If the client is already disconnected, it
-    client_->flush();
+    // causes a SIGPIPE termination!!!
   } else {
     client_->close();
   }
@@ -131,12 +126,3 @@ void RemoteClient::SendData(pb::remote::Message *msg) {
 QAbstractSocket::SocketState RemoteClient::State() {
   return client_->state();
 }
-
-void RemoteClient::Disconnected() {
-  qLog(Info) << "Client Disconnected";
-}
-
-void RemoteClient::Error(QAbstractSocket::SocketError socket_error) {
-  qLog(Info) << "Client Error:" << socket_error;
-  client_->close();
-}

src/networkremote/remoteclient.h

@@ -25,9 +25,7 @@ signals:
 
 private:
   void ParseMessage(const QByteArray& data);
-  void DisconnectClient();
+  void DisconnectClientWrongAuthCode();
-  void Disconnected();
-  void Error(QAbstractSocket::SocketError);
 
   Application* app_;