x11

I'm trying to create a small window manager (just for fun), but I'm having problems in handling windows created by Firefox (only with that application, other apps works fine) The problem is, after I launch Firefox, and add my decoration, it seems to work fine, but if for example I try to click on the menu button, the (sub)window doesn't appear. What seems to happen is that after the click, a ClientMessage event is fired with the following values: Data: (null) Data: _NET_WM_STATE_HIDDEN Data: (null) Data: (null) Data: (null) Now the problem is that I don't know how to show the window, which

Is there any way to find out if the current session user is running an Xserver (under Linux) ? I'v started off with things like: ps -e | grep X but this doesn't work always and one more thing I tried is checking the $DISPLAY variable Are there any other ways to check this? EDIT: Some people suggested using the $DISPLAY variables but what if the user fiddles with this variable ? what if he tries to do something and changes this variable and then when I check it, it no longer reflects an accurate state of the system. Is there no specific way to do this that will always return a correct answer ?

My question is similar to a question previously posted but never really answered here: Disable GUI, graphics devices in R I do not like the R tcltk popups for CRAN mirror selection. They also pop up to choose a package when searching for help on a function in two packages. Is there any way to disable these windows without disabling X11 completely? I still want plot() commands to work as normal, but disable the little select menus that take forever to load over a remote connection. For example, if you use ssh, but don't use -X, then the mirror select is just text within R, you type a number. It

I want to create a simple stacking window manager (in C ) for private use, mainly for the purpose of learning and challenging myself. I've looked through twm 's source code which has relatively few bells and whistles but it seems very low level since it's not based on a widget toolkit. 1 Would using a toolkit such as GTK+ be preferable? I'm afraid that some of the code and libraries in twm might be too antiquated ( edit: deprecated) and I want the window manager to use relatively modern libraries. For the sake of understanding I would also be interested in suggestions how to start a window