Second Life Physics Scripting #28 - disconnecting users

I arrived at the game to find that it would not let me start because it thought someone else was still playing.

This is the code that wasn't allowing me to join.

    touch_start(integer total_number)
    {
        if (avatar_attached)
            {
                llSay(0, "Currently allows only one player at a time. Sorry.");
                return;
            }

But the real problem was in the avatar_attached flag not being reset. The user must have logged out without hitting the release keys button so I never go the disconnect event. There doesn't seem to be anyway to drop those connections so I need to at least pay attention to their distance from the table.

This is the new timer code.

   timer()
    {
    ....

        // see if we still have control
        if (avatar_attached)
        {
            if( !(llGetPermissions() & PERMISSION_TAKE_CONTROLS) )
            {
                auto_tick_count = 0;
                avatar_attached = FALSE;
            }
            else
            {
                // check the distance to the avatar...
                key curkey = llGetPermissionsKey();
                
                list    temp;
                vector  pos;
                vector  pos2;

                temp = llGetObjectDetails(curkey,[OBJECT_POS]);
                pos  = llList2Vector(temp,0);
                
                pos2 = llGetRootPosition();
                
                float dist = llVecDist(pos,pos2);
                llOwnerSay("dist = "+(string)dist);
                if (dist>15)
                {
                    llSay(0,"Player too far away - resetting");
                    auto_tick_count = 0;
                    avatar_attached = FALSE;
                    llRequestPermissions(avatar_key, 0);
                    avatar_key = NULL_KEY;
                }
            }
        }
    }

I get the key of the avatar that is currently attached. Then I check that avatar's distance. If they are too far away, I reset the avatar attached key. There was still one more problem if they walked back into the area then they could still send control events so I added some extra code to runtime permissions to save the last player that attached.

    run_time_permissions(integer perm) 
    { 
        // permissions dialog answered
        if (perm & PERMISSION_TAKE_CONTROLS)
        { 
            // we got a yes
            // take up and down controls
            llTakeControls(CONTROL_ROT_LEFT | CONTROL_ROT_RIGHT | CONTROL_UP | CONTROL_DOWN, TRUE, FALSE); 
            // remove any balls on the table
            llSay(1296,"byebye");
            in_play = FALSE;
            
            avatar_attached = TRUE;   
            avatar_key = llGetPermissionsKey();
            RestartGame();
        }            
    }

And then to the control code to double check the current key with the key sending the control event.

   control(key id, integer held, integer change)
    {
        if (id!=avatar_key)
        {
            list temp = llGetObjectDetails(id,[OBJECT_NAME]);
            string nm  = llList2String(temp,0);

            llSay(0,nm+", you have been disconected, press the Release Keys button and touch the pinball machine again.");
            return;
        }

I wanted to send them the message directly and probably can with an IM, but for now it was just easier to send it with their name attached to identify that the message was to them.