WIP: Try move all GUI interaction to the first binaryonegui

This is broken, incomplete code

12 files changed, 379 insertions, 251 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0745441..c120736 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,6 +21,11 @@ SET(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake)
 FIND_PACKAGE(Qt4 REQUIRED)
 FIND_PACKAGE(Cups REQUIRED)
 
+# include Qt modules
+#SET(QT_USE_QTDBUS TRUE)
+SET(QT_USE_QTNETWORK TRUE)
+#SET(QT_USE_QTWEBKIT TRUE)
+
 # some includes
 INCLUDE_DIRECTORIES(
 	${CMAKE_SOURCE_DIR}
@@ -34,11 +39,13 @@ INCLUDE_DIRECTORIES(
 # printergui (maingui)
 FILE(GLOB MAINGUI_SRCS
 	src/maingui/*.cpp
+	src/*.c
 )
 
 # password gui (printpwgui
 FILE(GLOB PWGUI_SRCS
 	src/pwgui/*.cpp
+	src/*.c
 )
 
 ################################################################################
@@ -50,59 +57,23 @@ FILE(GLOB MAINGUI_UIS
 	src/maingui/*.ui
 )
 
-FILE(GLOB PWGUI_UIS
-	src/pwgui/*.ui
-)
-
-# .qrc files
-#SET(MAINGUI_RCS pvsmgr.qrc)
-#SET(PWGUI_RCS pvsclient.qrc)
-
 # includes all header files that should be treated with moc
 SET(MAINGUI_MOC_HDRS
 	src/maingui/printergui.h
 	src/maingui/backdrop.h
+	src/maingui/pwgui.h
 )
 
-SET(PWGUI_MOC_HDRS
-	src/pwgui/pwgui.h
-)
-
-# i18n
-#FILE(GLOB MAINGUI_TSS
-#	i18n/server/*.ts
-#)
-
-#FILE(GLOB PWGUI_TSS
-#	i18n/client/*.ts
-#)
-
-
-# include Qt modules
-#SET(QT_USE_QTDBUS TRUE)
-#SET(QT_USE_QTNETWORK TRUE)
-#SET(QT_USE_QTWEBKIT TRUE)
-
 # add some useful macros and variables
 # (QT_USE_FILE is a variable defined by FIND_PACKAGE( Qt4 ) that contains
 # a path to CMake script)
 INCLUDE(${QT_USE_FILE})
 
-# this will run rcc on .qrc files
-#QT4_ADD_RESOURCES(MAINGUI_RC_SRCS ${MAINGUI_RCS})
-#QT4_ADD_RESOURCES(PWGUI_RC_SRCS ${PWGUI_RCS})
-
 # this will run uic on .ui files
 QT4_WRAP_UI(MAINGUI_UI_HDRS ${MAINGUI_UIS})
-QT4_WRAP_UI(PWGUI_UI_HDRS ${PWGUI_UIS})
 
 # this will run moc
 QT4_WRAP_CPP(MAINGUI_MOC_SRCS ${MAINGUI_MOC_HDRS})
-QT4_WRAP_CPP(PWGUI_MOC_SRCS ${PWGUI_MOC_HDRS})
-
-# i18n, run lupdate and lrelease)
-#QT4_CREATE_TRANSLATION(MAINGUI_QMS ${MAINGUI_SRCS} ${MAINGUI_UI_HDRS} ${MAINGUI_TSS})
-#QT4_CREATE_TRANSLATION(PWGUI_QMS ${PWGUI_SRCS} ${PWGUI_UI_HDRS} ${PWGUI_TSS})
 
 ################################################################################
 # Build
@@ -113,15 +84,10 @@ ADD_EXECUTABLE(printergui
     ${MAINGUI_MOC_SRCS}
     ${MAINGUI_UI_HDRS}
     ${MAINGUI_RC_SRCS}
-    ${MAINGUI_QMS}
 )
 
 ADD_EXECUTABLE(printpwgui
     ${PWGUI_SRCS}
-    ${PWGUI_MOC_SRCS}
-    ${PWGUI_UI_HDRS}
-    ${PWGUI_RC_SRCS}
-    ${PWGUI_QMS}
 )
 
 # link
@@ -130,10 +96,6 @@ TARGET_LINK_LIBRARIES(printergui
     ${CUPS_LIBRARIES}
 )
 
-TARGET_LINK_LIBRARIES(printpwgui
-    ${QT_LIBRARIES}
-)
-
 # install
 INSTALL(TARGETS printergui printpwgui RUNTIME DESTINATION bin)
 
diff --git a/src/maingui/backdrop.cpp b/src/maingui/backdrop.cpp
index 4a907e8..db16b01 100644
--- a/src/maingui/backdrop.cpp
+++ b/src/maingui/backdrop.cpp
@@ -1,4 +1,6 @@
 #include "backdrop.h"
+#include "../util.h"
+#include "pwgui.h"
 
 #include <QApplication>
 #include <QDesktopWidget>
@@ -6,11 +8,18 @@
 #include <QPaintEvent>
 #include <QPixmap>
 #include <QRgb>
+#include <QLocalServer>
+#include <QLocalSocket>
+#include <sys/stat.h>
+
+static const QString strTest("test");
 
 Backdrop::Backdrop() :
 			QWidget(NULL),
 			screenshot(NULL),
-			mainWindow(NULL)
+			mainWindow(NULL),
+			server(NULL),
+			pwgui(NULL)
 {
 	QPixmap shot = QPixmap::grabWindow(QApplication::desktop()->winId());
 	if (!shot.isNull() && shot.height() > 0) {
@@ -34,6 +43,75 @@ Backdrop::Backdrop() :
 	screenshot = new QPixmap(shot);
 	this->resize(screenshot->width(), screenshot->height());
 	this->setWindowFlags(Qt::Tool | Qt::CustomizeWindowHint | Qt::FramelessWindowHint);
+
+	char sockPath[500];
+	if (NULL != util_sockPath(-1, -1, sockPath, sizeof sockPath)) {
+		QString path = QString::fromUtf8(sockPath);
+		QFile::remove(path);
+		server = new QLocalServer(this);
+		if (server->listen(sockPath)) {
+			chmod(sockPath, 0600);
+			QObject::connect(server, SIGNAL(newConnection()), this, SLOT(newConnection()));
+		}
+	}
+	QObject::connect(QApplication::instance(), SIGNAL(aboutToQuit()), this, SLOT(aboutToQuit()));
+}
+
+QLocalSocket* Backdrop::getClient()
+{
+	QObject *sender = QObject::sender();
+	if (sender == NULL || sender->property("test").toString() != strTest)
+		return NULL;
+	return (QLocalSocket*)sender;
+}
+
+void Backdrop::newConnection()
+{
+	QLocalSocket *client;
+	while ((client = server->nextPendingConnection())) {
+		client->setProperty("test", strTest);
+		QObject::connect(client, SIGNAL(readyRead()), this, SLOT(incomingData()));
+		QObject::connect(client, SIGNAL(error(QLocalSocket::LocalSocketError)), this, SLOT(closeConnection()));
+		QObject::connect(client, SIGNAL(disconnected()), this, SLOT(closeConnection()));
+	}
+}
+
+void Backdrop::closeConnection()
+{
+	QLocalSocket *client = getClient();
+	client->close();
+	client->waitForDisconnected(50);
+	client->deleteLater();
+}
+
+void Backdrop::incomingData()
+{
+	QLocalSocket *client = getClient();
+	char buffer[100];
+	while (client->canReadLine()) {
+		if (client->readLine(buffer, sizeof buffer) > 0) {
+			if (strcmp(buffer, "open") == 0) {
+				if (pwgui == NULL) {
+					pwgui = new PwGui(this);
+				}
+				if (pwgui->isVisible()) {
+					client->write("busy\n");
+				} else {
+					pwgui->exec();
+					if (pwgui->isCancelled()) {
+						server->blockSignals(true);
+						client->write("cancel\n");
+						client->waitForBytesWritten(1000);
+						client->close();
+						client->waitForDisconnected(50);
+						QApplication::exit(0);
+					}
+					// Got some credentials, send to back end
+					client->write(pwgui->getUser().toUtf8() += '\0' += pwgui->getPassword() += '\0');
+				}
+			}
+		}
+	}
 }
 
 Backdrop::~Backdrop()
@@ -49,8 +127,19 @@ void Backdrop::paintEvent(QPaintEvent * event)
 
 void Backdrop::mouseReleaseEvent(QMouseEvent * event)
 {
-	if (mainWindow != NULL) {
+	if (pwgui != NULL && pwgui->isVisible()) {
+		pwgui->raise();
+		pwgui->activateWindow();
+	} else if (mainWindow != NULL && mainWindow->isVisible()) {
 		mainWindow->raise();
 		mainWindow->activateWindow();
 	}
 }
+
+void Backdrop::aboutToQuit()
+{
+	if (server != NULL) {
+		QFile::remove(server->serverName());
+		server->close();
+	}
+}
diff --git a/src/maingui/backdrop.h b/src/maingui/backdrop.h
index b798a89..7df6d40 100644
--- a/src/maingui/backdrop.h
+++ b/src/maingui/backdrop.h
@@ -4,6 +4,9 @@
 #include <QWidget>
 
 class QPixmap;
+class QLocalServer;
+class QLocalSocket;
+class PwGui;
 
 class Backdrop : public QWidget
 {
@@ -12,6 +15,16 @@ class Backdrop : public QWidget
 private:
 	const QPixmap * screenshot;
 	QWidget * mainWindow;
+	QLocalServer * server;
+	PwGui * pwgui;
+
+	QLocalSocket* getClient();
+
+private slots:
+	void newConnection();
+	void closeConnection();
+	void incomingData();
+	void aboutToQuit();
 
 protected:
 	virtual void paintEvent(QPaintEvent * event);
diff --git a/src/maingui/main.cpp b/src/maingui/main.cpp
index 25f81a0..be4099b 100644
--- a/src/maingui/main.cpp
+++ b/src/maingui/main.cpp
@@ -38,7 +38,6 @@ int main(int argc, char *argv[])
 	return a.exec();
 }
 
-
 static Backdrop* showGrayBackground()
 {
 	Backdrop *bg = new Backdrop;
diff --git a/src/maingui/printergui.cpp b/src/maingui/printergui.cpp
index 21e03f4..2506fd6 100644
--- a/src/maingui/printergui.cpp
+++ b/src/maingui/printergui.cpp
@@ -212,7 +212,7 @@ void PrinterGui::closeEvent(QCloseEvent * e)
 			cupsCancelJob(ui->printerList->currentItem()->text(0).toUtf8().constData(), jobId);
 			jobId = 0;
 		}
-		QCoreApplication::instance()->exit(0);
+		QApplication::exit(0);
 	}
 	QDialog::closeEvent(e);
 }
@@ -313,7 +313,6 @@ void PrinterGui::on_buttonPrint_clicked()
 		ui->lineEditCopies->setEnabled(false);
 		ui->printerList->setEnabled(false);
 	}
-
 }
 
 void PrinterGui::bgTimer_timeout()
@@ -324,7 +323,7 @@ void PrinterGui::bgTimer_timeout()
 	}
 	if (++this->bgTimeout > 120) {
 		// Job was sent, GUI is invisible, quit after a few seconds
-		QCoreApplication::instance()->exit(0);
+		QApplication::exit(0);
 	}
 }
 
diff --git a/src/pwgui/pwgui.cpp b/src/maingui/pwgui.cpp
index 193341b..635ca42 100644
--- a/src/pwgui/pwgui.cpp
+++ b/src/maingui/pwgui.cpp
@@ -2,16 +2,16 @@
 #include "ui_pwgui.h"
 #include <QMessageBox>
 #include <QTimer>
-#include <QDesktopWidget>
+#include <QDialog>
 #include <unistd.h>
 
 #define BUFLEN 400
 
 // ____________________________________________________________________________
-PwGui::PwGui(int pfd, char *user, QWidget *parent) :
-	QMainWindow(parent),
+PwGui::PwGui(QWidget *parent) :
+	QDialog(parent),
 	ui(new Ui::PwGui),
-	pipefd(pfd)
+	cancelled(true)
 {
 	// Initialize UI
 	initializeUI(user);
@@ -25,10 +25,23 @@ PwGui::~PwGui()
 	delete ui;
 }
 
+const QString PwGui::getUser() const
+{
+	return ui->lineEditUser->text();
+}
+
+const QString PwGui::getPassword() const
+{
+	return ui->lineEditPass->text();
+}
+
 // ____________________________________________________________________________
 void PwGui::initializeUI(char *user)
 {
 	ui->setupUi(this);
+	this->setWindowModality(Qt::ApplicationModal);
+	// Put always on top
+	this->setWindowFlags(Qt::Dialog | Qt::WindowStaysOnTopHint);
 
 	// Prefill username
 	if (user != NULL) {
@@ -41,37 +54,44 @@ void PwGui::initializeUI(char *user)
 
 	/*  Main Window properties  */
 
-	// Disable close button
-	this->setWindowFlags((this->windowFlags() & ~Qt::WindowCloseButtonHint) | Qt::WindowStaysOnTopHint);
 	// center dialog on screen center
 	QRect desktopRect = QApplication::desktop()->screenGeometry(this);
 	this->move( desktopRect.width()/2-this->width()/2,
 	            desktopRect.height()/2-this->height()/2 );
-	this->show();
-	this->showNormal();
-	this->raise();
-	this->activateWindow();
 }
 
 // ____________________________________________________________________________
 void PwGui::on_accept()
 {
-	char buffer[BUFLEN + 1];
-	int len = snprintf(buffer, BUFLEN, "%s%c%s%c", ui->lineEditUser->text().toUtf8().constData(), 0, ui->lineEditPass->text().toUtf8().constData(), 0);
-	if (len > BUFLEN) {
-		len = BUFLEN;
-	}
-	buffer[len] = '\0';
-	::write(pipefd, buffer, len);
-	::close(pipefd);
-	// Quit with code 0
-	QCoreApplication::instance()->exit(0);
+	cancelled = false;
+	this->close();
 }
 
 // ____________________________________________________________________________
 void PwGui::on_reject()
 {
-	// Quit with code 1
-	QCoreApplication::instance()->exit(1);
+	this->close();
 }
 
+void PwGui::keyPressEvent(QKeyEvent * e)
+{
+	if(e->key() != Qt::Key_Escape) {
+		QMainWindow::keyPressEvent(e);
+		return;
+	}
+	this->close();
+}
+
+void PwGui::hideEvent(QHideEvent * e)
+{
+	this->close();
+}
+
+int PwGui::exec() {
+	cancelled = true;
+	this->show();
+	this->showNormal();
+	this->raise();
+	this->activateWindow();
+	return QDialog::exec();
+}
diff --git a/src/maingui/pwgui.h b/src/maingui/pwgui.h
new file mode 100644
index 0000000..fa3f465
--- /dev/null
+++ b/src/maingui/pwgui.h
@@ -0,0 +1,40 @@
+#ifndef AUTHENTICATION_H
+#define AUTHENTICATION_H
+
+#include <QDialog>
+#include <QDebug>
+
+namespace Ui
+{
+class PwGui;
+}
+
+class QTimer;
+
+class PwGui : public QDialog
+{
+	Q_OBJECT
+
+public:
+	explicit PwGui(QWidget *parent = 0);
+	~PwGui();
+	const QString getUser() const;
+	const QString getPassword() const;
+	const bool isCancelled() const { return cancelled; };
+	int exec();
+
+protected:
+	void hideEvent(QHideEvent * e);
+	void keyPressEvent(QKeyEvent * e);
+
+private slots:
+	void on_accept();
+	void on_reject();
+
+private:
+	Ui::PwGui *ui;
+	void initializeUI(char *username);
+	bool cancelled;
+};
+
+#endif // AUTHENTICATION_H
diff --git a/src/maingui/pwgui.ui b/src/maingui/pwgui.ui
new file mode 100644
index 0000000..32678a8
--- /dev/null
+++ b/src/maingui/pwgui.ui
@@ -0,0 +1,135 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>PwGui</class>
+ <widget class="QDialog" name="PwGui">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>310</width>
+    <height>160</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <property name="windowTitle">
+   <string>Drucken - Authentifizierung</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout_2">
+   <item>
+      <layout class="QHBoxLayout" name="horizontalLayout">
+       <item>
+        <widget class="QLabel" name="label">
+         <property name="text">
+          <string>Benutzername</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <spacer name="horizontalSpacer">
+         <property name="orientation">
+          <enum>Qt::Horizontal</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>40</width>
+           <height>20</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item>
+        <widget class="QLineEdit" name="lineEditUser">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </item>
+     <item>
+      <layout class="QHBoxLayout" name="horizontalLayout_3">
+       <item>
+        <widget class="QLabel" name="label_2">
+         <property name="text">
+          <string>Passwort</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <spacer name="horizontalSpacer_2">
+         <property name="orientation">
+          <enum>Qt::Horizontal</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>40</width>
+           <height>20</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item>
+        <widget class="QLineEdit" name="lineEditPass">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </item>
+     <item>
+      <widget class="QLabel" name="labelStatus">
+       <property name="layoutDirection">
+        <enum>Qt::LeftToRight</enum>
+       </property>
+       <property name="frameShape">
+        <enum>QFrame::Panel</enum>
+       </property>
+       <property name="frameShadow">
+        <enum>QFrame::Sunken</enum>
+       </property>
+       <property name="text">
+        <string>Bitte Anmelden</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="verticalSpacer">
+       <property name="orientation">
+        <enum>Qt::Vertical</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>20</width>
+         <height>40</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <layout class="QHBoxLayout" name="horizontalLayout_2">
+       <item>
+        <widget class="QDialogButtonBox" name="buttonBox">
+         <property name="standardButtons">
+          <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+         </property>
+        </widget>
+       </item>
+      </layout>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/src/pwgui/pwgui.h b/src/pwgui/pwgui.h
deleted file mode 100644
index 348c5a1..0000000
--- a/src/pwgui/pwgui.h
+++ /dev/null
@@ -1,32 +0,0 @@
-#ifndef AUTHENTICATION_H
-#define AUTHENTICATION_H
-
-#include <QMainWindow>
-#include <QDebug>
-
-namespace Ui
-{
-class PwGui;
-}
-
-class QTimer;
-
-class PwGui : public QMainWindow
-{
-	Q_OBJECT
-
-public:
-	explicit PwGui(int pfd, char *user, QWidget *parent = 0);
-	~PwGui();
-
-private slots:
-	void on_accept();
-	void on_reject();
-
-private:
-	Ui::PwGui *ui;
-	void initializeUI(char *username);
-	int pipefd;
-};
-
-#endif // AUTHENTICATION_H
diff --git a/src/pwgui/pwgui.ui b/src/pwgui/pwgui.ui
deleted file mode 100644
index 236df30..0000000
--- a/src/pwgui/pwgui.ui
+++ /dev/null
@@ -1,145 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<ui version="4.0">
- <class>PwGui</class>
- <widget class="QMainWindow" name="PwGui">
-  <property name="geometry">
-   <rect>
-    <x>0</x>
-    <y>0</y>
-    <width>310</width>
-    <height>160</height>
-   </rect>
-  </property>
-  <property name="sizePolicy">
-   <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
-    <horstretch>0</horstretch>
-    <verstretch>0</verstretch>
-   </sizepolicy>
-  </property>
-  <property name="windowTitle">
-   <string>Drucken - Authentifizierung</string>
-  </property>
-  <widget class="QWidget" name="verticalLayoutWidget">
-   <property name="geometry">
-    <rect>
-     <x>9</x>
-     <y>9</y>
-     <width>291</width>
-     <height>141</height>
-    </rect>
-   </property>
-   <layout class="QVBoxLayout" name="verticalLayout">
-    <item>
-     <layout class="QHBoxLayout" name="horizontalLayout">
-      <item>
-       <widget class="QLabel" name="label">
-        <property name="text">
-         <string>Benutzername</string>
-        </property>
-       </widget>
-      </item>
-      <item>
-       <spacer name="horizontalSpacer">
-        <property name="orientation">
-         <enum>Qt::Horizontal</enum>
-        </property>
-        <property name="sizeHint" stdset="0">
-         <size>
-          <width>40</width>
-          <height>20</height>
-         </size>
-        </property>
-       </spacer>
-      </item>
-      <item>
-       <widget class="QLineEdit" name="lineEditUser">
-        <property name="sizePolicy">
-         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
-          <horstretch>0</horstretch>
-          <verstretch>0</verstretch>
-         </sizepolicy>
-        </property>
-       </widget>
-      </item>
-     </layout>
-    </item>
-    <item>
-     <layout class="QHBoxLayout" name="horizontalLayout_3">
-      <item>
-       <widget class="QLabel" name="label_2">
-        <property name="text">
-         <string>Passwort</string>
-        </property>
-       </widget>
-      </item>
-      <item>
-       <spacer name="horizontalSpacer_2">
-        <property name="orientation">
-         <enum>Qt::Horizontal</enum>
-        </property>
-        <property name="sizeHint" stdset="0">
-         <size>
-          <width>40</width>
-          <height>20</height>
-         </size>
-        </property>
-       </spacer>
-      </item>
-      <item>
-       <widget class="QLineEdit" name="lineEditPass">
-        <property name="sizePolicy">
-         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
-          <horstretch>0</horstretch>
-          <verstretch>0</verstretch>
-         </sizepolicy>
-        </property>
-       </widget>
-      </item>
-     </layout>
-    </item>
-    <item>
-     <widget class="QLabel" name="labelStatus">
-      <property name="layoutDirection">
-       <enum>Qt::LeftToRight</enum>
-      </property>
-      <property name="frameShape">
-       <enum>QFrame::Panel</enum>
-      </property>
-      <property name="frameShadow">
-       <enum>QFrame::Sunken</enum>
-      </property>
-      <property name="text">
-       <string>Bitte Anmelden</string>
-      </property>
-     </widget>
-    </item>
-    <item>
-     <spacer name="verticalSpacer">
-      <property name="orientation">
-       <enum>Qt::Vertical</enum>
-      </property>
-      <property name="sizeHint" stdset="0">
-       <size>
-        <width>20</width>
-        <height>40</height>
-       </size>
-      </property>
-     </spacer>
-    </item>
-    <item>
-     <layout class="QHBoxLayout" name="horizontalLayout_2">
-      <item>
-       <widget class="QDialogButtonBox" name="buttonBox">
-        <property name="standardButtons">
-         <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
-        </property>
-       </widget>
-      </item>
-     </layout>
-    </item>
-   </layout>
-  </widget>
- </widget>
- <resources/>
- <connections/>
-</ui>
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..9e7c892
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,38 @@
+#include "util.h"
+#include <sys/types.h>
+#include <unistd.h>
+#include <string.h>
+#include <pwd.h>
+#include <stdio.h>
+
+char *util_userHome(int uid, char *buffer, size_t len)
+{
+	struct passwd pwd;
+	struct passwd *res;
+	char b[1000];
+	getpwuid_r(uid, &pwd, b, sizeof b, &res);
+	if (res == NULL || res->pw_dir == NULL)
+		return NULL;
+	int printret = snprintf(buffer, len, "%s", res->pw_dir);
+	if (printret < 0 || printret >= (int)len)
+		return NULL;
+	buffer[len-1] = '\0';
+	return buffer;
+}
+
+char *util_sockPath(int uid, int pid, char *buffer, size_t len)
+{
+	char home[120];
+	if (uid == -1) {
+		uid = (int)getuid();
+	}
+	if (pid == -1) {
+		pid = (int)getpid();
+	}
+	if (util_userHome(uid, home, sizeof home) == NULL)
+		return NULL;
+	int printret = snprintf(buffer, len, "%s/.printergui.%d", pid);
+	if (printret < 0 || printret >= (int)len)
+		return NULL;
+	return buffer;
+}
diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..cc7d4b7
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,10 @@
+#ifndef UTIL_H_
+#define UTIL_H_
+
+#include <stdlib.h>
+
+char *util_userHome(int uid, char *buffer, size_t len);
+
+char *util_sockPath(int uid, int pid, char *buffer, size_t len);
+
+#endif /* UTIL_H_ */