Update twin with initial framework for application suspend/resume

This needs some additional work before it can be enabled

twin/KWinInterface.h

@@ -13,6 +13,8 @@ class KWinInterface : virtual public DCOPObject
     virtual ASYNC unclutterDesktop() = 0;
     virtual ASYNC reconfigure() = 0;
     virtual ASYNC killWindow() = 0;
+    virtual ASYNC suspendWindow() = 0;
+    virtual ASYNC resumeWindow() = 0;
     virtual void refresh() = 0;
     virtual void doNotManage(TQString)= 0;
     virtual void showWindowMenuAt(unsigned long winId, int x, int y)= 0;

twin/client.cpp

@@ -1834,6 +1834,124 @@ void Client::killProcess( bool ask, Time timestamp )
         }
     }
 
+bool Client::isSuspendable() const
+    {
+    TQCString machine = wmClientMachine( true );
+    pid_t pid = info->pid();
+    if( pid <= 0 || machine.isEmpty()) // needed properties missing
+        return false;
+    kdDebug( 1212 ) << "Suspend process:" << pid << "(" << machine << ")" << endl;
+    if( machine != "localhost" )
+        {
+        return false;
+        }
+    else
+        {
+        FILE *procfile;
+        if(chdir(TQString("/proc/%1").arg(pid).ascii()) == 0)
+            {
+            procfile = fopen("stat", "r");
+            }
+        if(!procfile)
+            {
+            return false;
+            }
+        else
+            {
+            long long int procpid;
+            char tcomm[PATH_MAX];
+            char state;
+            fscanf(procfile, "%lld ", &procpid);
+            fscanf(procfile, "%s ", tcomm);
+            fscanf(procfile, "%c ", &state);
+            if( state != 'T' )
+                {
+                fclose(procfile);
+                return true;
+                }
+            else
+                {
+                fclose(procfile);
+                return false;
+                }
+            }
+        }
+    }
+
+bool Client::isResumeable() const
+    {
+    TQCString machine = wmClientMachine( true );
+    pid_t pid = info->pid();
+    if( pid <= 0 || machine.isEmpty()) // needed properties missing
+        return false;
+    kdDebug( 1212 ) << "Suspend process:" << pid << "(" << machine << ")" << endl;
+    if( machine != "localhost" )
+        {
+        return false;
+        }
+    else
+        {
+        FILE *procfile;
+        if(chdir(TQString("/proc/%1").arg(pid).ascii()) == 0)
+            {
+            procfile = fopen("stat", "r");
+            }
+        if(!procfile)
+            {
+            return false;
+            }
+        else
+            {
+            long long int procpid;
+            char tcomm[PATH_MAX];
+            char state;
+            fscanf(procfile, "%lld ", &procpid);
+            fscanf(procfile, "%s ", tcomm);
+            fscanf(procfile, "%c ", &state);
+            if( state == 'T' )
+                {
+                fclose(procfile);
+                return true;
+                }
+            else
+                {
+                fclose(procfile);
+                return false;
+                }
+            }
+        }
+    }
+
+void Client::suspendWindow()
+    {
+    TQCString machine = wmClientMachine( true );
+    pid_t pid = info->pid();
+    if( pid <= 0 || machine.isEmpty()) // needed properties missing
+        return;
+    kdDebug( 1212 ) << "Suspend process:" << pid << "(" << machine << ")" << endl;
+    if( machine != "localhost" )
+        {
+        return;
+        }
+    else
+        ::kill( pid, SIGSTOP );
+    }
+
+void Client::resumeWindow()
+    {
+    TQCString machine = wmClientMachine( true );
+    pid_t pid = info->pid();
+    if( pid <= 0 || machine.isEmpty()) // needed properties missing
+        return;
+    kdDebug( 1212 ) << "Resume process:" << pid << "(" << machine << ")" << endl;
+    if( machine != "localhost" )
+        {
+        return;
+        }
+    else
+        ::kill( pid, SIGCONT );
+    }
+
 void Client::processKillerExited()
     {
     kdDebug( 1212 ) << "Killer exited" << endl;

twin/client.h

@@ -113,6 +113,9 @@ class Client : public TQObject, public KDecorationDefines
         bool isActive() const;
         void setActive( bool, bool updateOpacity = true );
 
+        bool isSuspendable() const;
+        bool isResumeable() const;
+
         int desktop() const;
         void setDesktop( int );
         bool isOnDesktop( int d ) const;
@@ -297,6 +300,8 @@ class Client : public TQObject, public KDecorationDefines
         void unminimize( bool avoid_animation = false );
         void closeWindow();
         void killWindow();
+        void suspendWindow();
+        void resumeWindow();
         void maximize( MaximizeMode );
         void toggleShade();
         void showContextHelp();

twin/lib/kdecoration.h

@@ -100,7 +100,9 @@ public:
         NoOp,
         SetupWindowShortcutOp,
         ApplicationRulesOp,    ///< @since 3.5
-        ShadowOp               ///< @since 3.5.12
+        ShadowOp,              ///< @since 3.5.12
+        SuspendWindowOp,       ///< @since R14.0
+        ResumeWindowOp         ///< @since R14.0
         };
     /**
      * Basic color types that should be recognized by all decoration styles.

twin/useractions.cpp

@@ -68,6 +68,10 @@ TQPopupMenu* Workspace::clientPopup()
 	advanced_popup->insertItem( i18n("Shad&ow"), Options::ShadowOp );
         advanced_popup->insertItem( SmallIconSet("key_bindings"),
             i18n("Window &Shortcut...")+'\t'+keys->shortcut("Setup Window Shortcut").seq(0).toString(), Options::SetupWindowShortcutOp );
+// FIXME
+// Uncomment these actions when twin can handle suspended applications in a user friendly manner
+//        advanced_popup->insertItem( SmallIconSet( "suspend" ), i18n("&Suspend Application"), Options::SuspendWindowOp );
+//        advanced_popup->insertItem( SmallIconSet( "exec" ), i18n("&Resume Application"), Options::ResumeWindowOp );
         advanced_popup->insertItem( SmallIconSet( "wizard" ), i18n("&Special Window Settings..."), Options::WindowRulesOp );
         advanced_popup->insertItem( SmallIconSet( "wizard" ), i18n("&Special Application Settings..."), Options::ApplicationRulesOp );
 
@@ -171,6 +175,8 @@ void Workspace::clientPopupAboutToShow()
     advanced_popup->setItemChecked( Options::KeepBelowOp, active_popup_client->keepBelow() );
     advanced_popup->setItemChecked( Options::FullScreenOp, active_popup_client->isFullScreen() );
     advanced_popup->setItemEnabled( Options::FullScreenOp, active_popup_client->userCanSetFullScreen() );
+    advanced_popup->setItemEnabled( Options::SuspendWindowOp, active_popup_client->isSuspendable() );
+    advanced_popup->setItemEnabled( Options::ResumeWindowOp, active_popup_client->isResumeable() );
     advanced_popup->setItemChecked( Options::NoBorderOp, active_popup_client->noBorder() );
     advanced_popup->setItemEnabled( Options::NoBorderOp, active_popup_client->userCanSetNoBorder() );
     
@@ -436,6 +442,12 @@ void Workspace::performWindowOperation( Client* c, Options::WindowOperation op )
         case Options::OperationsOp:
             c->performMouseCommand( Options::MouseShade, TQCursor::pos());
             break;
+        case Options::SuspendWindowOp:
+            c->suspendWindow();
+            break;
+        case Options::ResumeWindowOp:
+            c->resumeWindow();
+            break;
         case Options::WindowRulesOp:
             editWindowRules( c, false );
             break;
@@ -991,6 +1003,22 @@ void Workspace::slotKillWindow()
     kill.start();
     }
 
+/*!
+  Suspend Window feature
+ */
+void Workspace::slotSuspendWindow()
+    {
+    active_popup_client->suspendWindow();
+    }
+
+/*!
+  Resume Window feature
+ */
+void Workspace::slotResumeWindow()
+    {
+    active_popup_client->resumeWindow();
+    }
+
 /*!
   Sends the popup client to desktop \a desk
 

twin/workspace.cpp

@@ -1909,6 +1909,60 @@ void Workspace::killWindowId( Window window_to_kill )
         XKillClient( qt_xdisplay(), window_to_kill );
     }
 
+void Workspace::suspendWindowId( Window window_to_suspend )
+    {
+    if( window_to_suspend == None )
+        return;
+    Window window = window_to_suspend;
+    Client* client = NULL;
+    for(;;)
+        {
+        client = findClient( FrameIdMatchPredicate( window ));
+        if( client != NULL ) // found the client
+            break;
+        Window parent, root;
+        Window* children;
+        unsigned int children_count;
+        XQueryTree( qt_xdisplay(), window, &root, &parent, &children, &children_count );
+        if( children != NULL )
+            XFree( children );
+        if( window == root ) // we didn't find the client, probably an override-redirect window
+            break;
+        window = parent; // go up
+        }
+    if( client != NULL )
+        client->suspendWindow();
+    else
+        return;
+    }
+
+void Workspace::resumeWindowId( Window window_to_resume )
+    {
+    if( window_to_resume == None )
+        return;
+    Window window = window_to_resume;
+    Client* client = NULL;
+    for(;;)
+        {
+        client = findClient( FrameIdMatchPredicate( window ));
+        if( client != NULL ) // found the client
+            break;
+        Window parent, root;
+        Window* children;
+        unsigned int children_count;
+        XQueryTree( qt_xdisplay(), window, &root, &parent, &children, &children_count );
+        if( children != NULL )
+            XFree( children );
+        if( window == root ) // we didn't find the client, probably an override-redirect window
+            break;
+        window = parent; // go up
+        }
+    if( client != NULL )
+        client->resumeWindow();
+    else
+        return;
+    }
+
 
 void Workspace::sendPingToWindow( Window window, Time timestamp )
     {

twin/workspace.h

@@ -97,8 +97,12 @@ class Workspace : public TQObject, public KWinInterface, public KDecorationDefin
          * @internal
          */
         void killWindowId( Window window);
+        void suspendWindowId( Window window);
+        void resumeWindowId( Window window);
 
         void killWindow() { slotKillWindow(); }
+        void suspendWindow() { slotSuspendWindow(); }
+        void resumeWindow() { slotResumeWindow(); }
 
         WId rootWin() const;
 
@@ -369,6 +373,8 @@ class Workspace : public TQObject, public KWinInterface, public KDecorationDefin
         void slotReconfigure();
 
         void slotKillWindow();
+        void slotSuspendWindow();
+        void slotResumeWindow();
 
         void slotGrabWindow();
         void slotGrabDesktop();