Various fixes for khotkeys. This resolves issue #326.

1. ensure there is a single khotkeys instance running per session
   instead of per screen (remote multihead related code)
2. allow khotkeys to be run as a kded module
3. make sure that khotkeys run either as a standalone application or as
   a kded module, but not both at the same time
4. do not register khotkeys as a main DCOP entry (like an app) anymore.
   When run as kded module, this was causing kded to be registered as
   khotkeys a second time.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 94368f4722fa8eae1f7e7cd4b02679a760b0d620)

8 files changed, 103 insertions, 111 deletions

diff --git a/khotkeys/CMakeL10n.txt b/khotkeys/CMakeL10n.txt
index 9efb3961d..5a4d15337 100644
--- a/khotkeys/CMakeL10n.txt
+++ b/khotkeys/CMakeL10n.txt
@@ -3,3 +3,9 @@
 tde_l10n_create_template( "khotkeys" )
 
 tde_l10n_auto_add_subdirectories()
+
+tde_l10n_create_template(
+    CATALOG "desktop_files/khotkeys.desktop/"
+    SOURCES app/khotkeys.desktop kcontrol/khotkeys.desktop
+    DESTINATION "${CMAKE_SOURCE_DIR}/translations"
+)
diff --git a/khotkeys/app/CMakeLists.txt b/khotkeys/app/CMakeLists.txt
index df2bd70db..470fdf1ce 100644
--- a/khotkeys/app/CMakeLists.txt
+++ b/khotkeys/app/CMakeLists.txt
@@ -22,6 +22,14 @@ link_directories(
 )
 
 
+##### other data ################################
+
+tde_create_translated_desktop(
+  SOURCE khotkeys.desktop
+  DESTINATION ${SERVICES_INSTALL_DIR}/kded
+)
+
+
 ##### kded_khotkeys (module) ####################
 
 tde_add_kpart( kded_khotkeys AUTOMOC
diff --git a/khotkeys/app/app.cpp b/khotkeys/app/app.cpp
index d05f3fd93..8da646ef6 100644
--- a/khotkeys/app/app.cpp
+++ b/khotkeys/app/app.cpp
@@ -16,6 +16,7 @@
 
 #include "app.h"
 
+#include <dcopclient.h>
 #include <tdecmdlineargs.h>
 #include <tdeconfig.h>
 #include <tdelocale.h>
@@ -42,18 +43,16 @@ KHotKeysApp::KHotKeysApp()
         delete_helper( new TQObject )
     {
     init_global_data( true, delete_helper ); // grab keys
-    // CHECKME triggery a dalsi vytvaret az tady za inicializaci
     actions_root = NULL;
     reread_configuration();
     }
 
 KHotKeysApp::~KHotKeysApp()
     {
-    // CHECKME triggery a dalsi rusit uz tady pred cleanupem
     delete actions_root;
-// Many global data should be destroyed while the TQApplication object still
-// exists, and therefore 'this' cannot be the parent, as ~Object
-// for 'this' would be called after ~TQApplication - use proxy object
+    // Many global data should be destroyed while the TQApplication object still
+    // exists, and therefore 'this' cannot be the parent, as ~Object()
+    // for 'this' would be called after ~TQApplication() - use proxy object
     delete delete_helper;
     }
 
@@ -93,66 +92,52 @@ static int khotkeys_screen_number = 0;
 
 extern "C"
 int TDE_EXPORT kdemain( int argc, char** argv )
+{
+  // Check if khotkeys is already running as a kded module.
+  // In such case just exit.
+  DCOPClient *dcopClient = new DCOPClient;
+  if (!dcopClient->isAttached())
+  {
+    if (!dcopClient->attach())
+    {
+      kdWarning(1217) << "khotkeys [application]: could not register with DCOP. Exiting." << endl;
+      delete dcopClient;
+      return 1;
+    }
+  }
+  TQCString replyType;
+  TQByteArray replyData;
+  if (dcopClient->call("kded", "kded", "loadedModules()",
+        TQByteArray(), replyType, replyData))
+  {
+    if (replyType == "QCStringList")
     {
-        {
-	// multiheaded hotkeys
-        TQCString multiHead = getenv("TDE_MULTIHEAD");
-        if (multiHead.lower() == "true") {
-	    Display *dpy = XOpenDisplay(NULL);
-	    if (! dpy) {
-		fprintf(stderr, "%s: FATAL ERROR while trying to open display %s\n",
-			argv[0], XDisplayName(NULL));
-		exit(1);
-	    }
-
-	    int number_of_screens = ScreenCount(dpy);
-	    khotkeys_screen_number = DefaultScreen(dpy);
-	    int pos;
-	    TQCString displayname = XDisplayString(dpy);
-	    XCloseDisplay(dpy);
-	    dpy = 0;
-
-	    if ((pos = displayname.findRev('.')) != -1)
-		displayname.remove(pos, 10);
-
-	    TQCString env;
-	    if (number_of_screens != 1) {
-		for (int i = 0; i < number_of_screens; i++) {
-		    if (i != khotkeys_screen_number && fork() == 0) {
-			khotkeys_screen_number = i;
-			// break here because we are the child process, we don't
-			// want to fork() anymore
-			break;
-		    }
-		}
-
-		env.sprintf("DISPLAY=%s.%d", displayname.data(), khotkeys_screen_number);
-		if (putenv(strdup(env.data()))) {
-		    fprintf(stderr,
-			    "%s: WARNING: unable to set DISPLAY environment variable\n",
-			    argv[0]);
-		    perror("putenv()");
-		}
-	    }
-	}
-        }
-
-    TQCString appname;
-    if (khotkeys_screen_number == 0)
-	appname = "khotkeys";
-    else
-	appname.sprintf("khotkeys-screen-%d", khotkeys_screen_number);
-
-                             // no need to i18n these, no GUI
-    TDECmdLineArgs::init( argc, argv, appname, I18N_NOOP( "KHotKeys" ),
-        I18N_NOOP( "KHotKeys daemon" ), KHOTKEYS_VERSION );
-    KUniqueApplication::addCmdLineOptions();
-    if( !KHotKeysApp::start()) // already running
-        return 0;
-    KHotKeysApp app;
-    app.disableSessionManagement();
-    return app.exec();
+      TQDataStream reply(replyData, IO_ReadOnly);
+      QCStringList modules;
+      reply >> modules;
+      if (modules.contains("khotkeys"))
+      {
+        // khotkeys is already running as a service, do nothing
+        kdWarning(1217) << "khotkeys is already running as a kded module. Exiting." << endl;
+        delete dcopClient;
+        return 2;
+      }
     }
+  }
+  delete dcopClient;
+
+  // no need to i18n these, no GUI
+  TDECmdLineArgs::init( argc, argv, "khotkeys", I18N_NOOP( "KHotKeys" ),
+      I18N_NOOP( "KHotKeys daemon" ), KHOTKEYS_VERSION );
+  KUniqueApplication::addCmdLineOptions();
+  if( !KHotKeysApp::start()) // already running
+  {
+    return 0;
+  }
+  KHotKeysApp app;
+  app.disableSessionManagement();
+  return app.exec();
+}
 
 
 #include "app.moc"
diff --git a/khotkeys/app/kded.cpp b/khotkeys/app/kded.cpp
index db4153e01..c78504919 100644
--- a/khotkeys/app/kded.cpp
+++ b/khotkeys/app/kded.cpp
@@ -16,6 +16,7 @@
 
 #include "kded.h"
 
+#include <dcopclient.h>
 #include <tdecmdlineargs.h>
 #include <tdeconfig.h>
 #include <tdelocale.h>
@@ -35,9 +36,17 @@
 
 extern "C" 
 TDE_EXPORT KDEDModule *create_khotkeys( const TQCString& obj )
-    {
-    return new KHotKeys::KHotKeysModule( obj );
-    }
+{
+  // Check if khotkeys is already running as a stand alone application.
+  // In such case just exit.
+  if (kapp->dcopClient()->isApplicationRegistered("khotkeys"))
+  {
+    kdWarning(1217) << "khotkeys [kded module] is already running as a standalone application. Exiting." << endl;
+    return nullptr;
+  }
+
+  return new KHotKeys::KHotKeysModule( obj );
+}
 
 namespace KHotKeys
 {
@@ -47,22 +56,7 @@ namespace KHotKeys
 KHotKeysModule::KHotKeysModule( const TQCString& obj )
     : KDEDModule( obj )
     {
-    for( int i = 0;
-         i < 5;
-         ++i )
-        {
-        if( kapp->dcopClient()->isApplicationRegistered( "khotkeys" ))
-            {
-            TQByteArray data, replyData;
-            TQCString reply;
-            // wait for it to finish
-            kapp->dcopClient()->call( "khotkeys*", "khotkeys", "quit()", data, reply, replyData );
-            sleep( 1 );
-            }
-        }
-    client.registerAs( "khotkeys", false ); // extra dcop connection (like if it was an app)
     init_global_data( true, this ); // grab keys
-    // CHECKME triggery a dalsi vytvaret az tady za inicializaci
     actions_root = NULL;
     reread_configuration();
     }
diff --git a/khotkeys/app/kded.h b/khotkeys/app/kded.h
index b2740a3a1..026087abe 100644
--- a/khotkeys/app/kded.h
+++ b/khotkeys/app/kded.h
@@ -12,27 +12,27 @@
 #define _KHOTKEYS_KDED_H_
 
 #include <kdedmodule.h>
-#include <dcopclient.h>
 
 namespace KHotKeys
 {
 
 class Action_data_group;
 
-class KHotKeysModule
-    : public KDEDModule
+class KHotKeysModule : public KDEDModule
     {
     TQ_OBJECT
     K_DCOP
+
     k_dcop:
         ASYNC reread_configuration();
         ASYNC quit(); 
+
     public:
         KHotKeysModule( const TQCString& obj );
         virtual ~KHotKeysModule();
+
     private:
         Action_data_group* actions_root;
-        DCOPClient client;
     };
 
 //***************************************************************************
diff --git a/khotkeys/app/khotkeys.desktop b/khotkeys/app/khotkeys.desktop
new file mode 100644
index 000000000..b40b5a6e5
--- /dev/null
+++ b/khotkeys/app/khotkeys.desktop
@@ -0,0 +1,13 @@
+[Desktop Entry]
+Type=Service
+
+Name=KHotkeys Daemon
+
+Comment=Handles input actions for the current session
+
+X-TDE-ServiceTypes=KDEDModule
+X-TDE-ModuleType=Library
+X-TDE-Library=khotkeys
+X-TDE-FactoryName=khotkeys
+X-TDE-Kded-autoload=true
+X-TDE-Kded-load-on-demand=false
diff --git a/khotkeys/kcontrol/CMakeL10n.txt b/khotkeys/kcontrol/CMakeL10n.txt
deleted file mode 100644
index a51e4afa8..000000000
--- a/khotkeys/kcontrol/CMakeL10n.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-##### create translation templates ##############
-
-tde_l10n_create_template(
-    CATALOG "desktop_files/khotkeys.desktop/"
-    SOURCES khotkeys.desktop
-    DESTINATION "${CMAKE_SOURCE_DIR}/translations"
-)
diff --git a/khotkeys/kcontrol/init.cpp b/khotkeys/kcontrol/init.cpp
index 14a9c964b..62abad638 100644
--- a/khotkeys/kcontrol/init.cpp
+++ b/khotkeys/kcontrol/init.cpp
@@ -24,24 +24,17 @@ extern "C"
 {
     TDE_EXPORT void init_khotkeys()
     {
-    TDEConfig cfg( "khotkeysrc", true );
-    cfg.setGroup( "Main" );
-    if( !cfg.readBoolEntry( "Autostart", false ))
-        return;
-    // Non-xinerama multhead support in KDE is just a hack
-    // involving forking apps per-screen. Don't bother with
-    // kded modules in such case.
-    TQCString multiHead = getenv("TDE_MULTIHEAD");
-    if (multiHead.lower() == "true")
-        kapp->tdeinitExec( "khotkeys" );
-    else
-        {
-        DCOPRef ref( "kded", "kded" );
-        if( !ref.call( "loadModule", TQCString( "khotkeys" )))
-            {
-            kdWarning( 1217 ) << "Loading of khotkeys module failed." << endl;
-            kapp->tdeinitExec( "khotkeys" );
-            }
-        }
+	TDEConfig cfg( "khotkeysrc", true );
+	cfg.setGroup( "Main" );
+	if( !cfg.readBoolEntry( "Autostart", false ))
+	{
+	  return;
+	}
+	DCOPRef ref( "kded", "kded" );
+	if( !ref.call( "loadModule", TQCString( "khotkeys" )))
+	{
+	    kdWarning( 1217 ) << "Loading of khotkeys module failed." << endl;
+	    kapp->tdeinitExec( "khotkeys" );
+	}
     }
 }