added 'suspend' button

mainwindow.cpp

@@ -7,12 +7,8 @@
 #include "tools.h"
 #include "password.h"
 #include <kcombobox.h>
-
-/*
-#include <klineedit.h>
-#include <khistorycombobox.h>
-#include <kcompletion.h>
-*/
+#include <signal.h>
+#include <QTextStream>
 
 using namespace std;
 
@@ -1622,12 +1618,61 @@ void MainWindow::on_actionHiddenService_triggered()
 
 void MainWindow::on_treeWidget_itemDoubleClicked(QTreeWidgetItem *item, int column)
 {
-	void();
+	(void) item;
+	(void) column;
 }
 
 
 void MainWindow::on_treeWidget_doubleClicked(const QModelIndex &index)
 {
-	void();
+	(void) index;
 }
 
+
+void MainWindow::on_actionPause_downloads_triggered()
+{
+	quint64 processID = this->downloading.process->processId();
+	QString fileStr = "/proc/" + QString::number(processID) + "/task/" + QString::number(processID) + "/children";
+	static QMessageBox *msgBox;
+
+	info (DEBUGMACRO, "downloading state : " + QString::fromUtf8((this->downloading.paused==0)?"running":"paused"));
+	info (DEBUGMACRO, "Downloading process ID : " + QString::number(processID));
+	info (DEBUGMACRO, fileStr);
+
+	QFile file(fileStr);
+	if(!file.open(QIODevice::ReadOnly))
+	{
+		QMessageBox::information(0, "error", file.errorString());
+	}
+
+	QTextStream in(&file);
+	QString children = in.readLine();
+	info (DEBUGMACRO, "Child process is : " + children);
+	if (this->downloading.paused)
+	{
+		info(DEBUGMACRO, "resuming Download");
+		if (kill(children.toLongLong(), SIGCONT))
+		{
+			info(DEBUGMACRO, "resuming failed : " + QString::number(errno));
+		}
+
+		msgBox->close();
+		this->downloading.paused = false;
+	}else
+	{
+		info(DEBUGMACRO, "pausing Download");
+		if (kill(children.toLongLong(), SIGTSTP))
+		{
+			info(DEBUGMACRO, "resuming failed : " + QString::number(errno));
+		}
+		msgBox = new QMessageBox(this);
+		msgBox->setIcon( QMessageBox::Warning );
+		msgBox->setText("Download suspended");
+		//QPushButton *btnCancel =  msgBox->addButton( "Cancel", QMessageBox::RejectRole );
+		msgBox->setAttribute(Qt::WA_DeleteOnClose); // delete pointer after close
+		msgBox->setModal(false);
+		msgBox->show();
+
+		this->downloading.paused = true;
+	}
+}

mainwindow.h

@@ -56,16 +56,17 @@ class Connexion
 	int bandwidthLimitUnit;
 	int contimeout = 20;
 	QString server;
-		QString service;
-		QString path;
-		QString savePath;
-		QString user;
-		QString password;
-		QProcess * process = nullptr;
-		int ipversion = 4;
-		uint port = 873;
-		bool quit = false;
-		void clear();
+	QString service;
+	QString path;
+	QString savePath;
+	QString user;
+	QString password;
+	QProcess * process = nullptr;
+	int ipversion = 4;
+	uint port = 873;
+	bool quit = false;
+	void clear();
+	bool paused = false;
 };
 
 class Downloading
@@ -75,13 +76,15 @@ class Downloading
 	QString service;
 	QString path;
 	QString savePath;
-		QString user;
-		QString password;
-		int ipversion = 4;
-		int port = 873;
-		QProcess * process = nullptr;
-		bool quit = false;
-		void clear();
+	QString user;
+	QString password;
+	int ipversion = 4;
+	int port = 873;
+	QProcess * process = nullptr;
+	bool quit = false;
+	bool paused = false;
+
+	void clear();
 };
 
 class About
@@ -223,6 +226,8 @@ class MainWindow : public QMainWindow
 
 		void on_treeWidget_doubleClicked(const QModelIndex &index);
 
+		void on_actionPause_downloads_triggered();
+
 	signals:
 		void stopDownloading(QProcess *);
 		void progressSignal(int);

mainwindow.ui

@@ -407,6 +407,7 @@
    <addaction name="actionAbout"/>
    <addaction name="actionAbout_Qt"/>
    <addaction name="actionExit"/>
+   <addaction name="actionPause_downloads"/>
   </widget>
   <action name="DefaultSaveFolder">
    <property name="icon">
@@ -479,6 +480,20 @@
     <string>hidden service</string>
    </property>
   </action>
+  <action name="actionPause_downloads">
+   <property name="icon">
+    <iconset theme="media-playback-pause"/>
+   </property>
+   <property name="text">
+    <string>Stop/resume downloads</string>
+   </property>
+   <property name="toolTip">
+    <string>Stop/resume downloading </string>
+   </property>
+   <property name="shortcut">
+    <string>P</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>