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@skx skx/ctrl-alt-t.c
Created Dec 7, 2014

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Run a terminal when ctrl-alt-t is pressed.
/**
* Launch a terminal when Ctrl-Alt-T is pressed.
*
* gcc -o ctrl-alt-t ctrl-alt-t.c -lX11
*
* Steve
* --
*
* PS. Use xbindkeys like a normal person ;)
*
*/
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdlib.h>
#include <stdio.h>
int main()
{
Display* dpy = XOpenDisplay(0);
Window root = DefaultRootWindow(dpy);
XEvent ev;
unsigned int modifiers = ControlMask | Mod1Mask;
int keycode = XKeysymToKeycode(dpy,XK_T);
Window grab_window = root;
Bool owner_events = False;
int pointer_mode = GrabModeAsync;
int keyboard_mode = GrabModeAsync;
/**
* OK this is unpleasant but we have to cope with XGrabKey.
*
* XGrabKey will let us listen for "keys" with "modifiers". But only
* exact matches will work.
*
* We want to be hit by Ctrl-Alt-t but what if the user has num-lock
* on? That will change the modifier.
*
* Similarly if capslock is on then our t becomes a T. Obviously.
*
*
* So we grab the key four times:
*
* Ctrl + Alt + t
*
* Ctrl + Alt + t + NumLock
*
* Ctrl + Alt + t + CapsLock
*
* Ctrl + Alt + t + NumLock + Capslock
*
* And that is the difference between reliable code and bogus code.
*
*/
XGrabKey(dpy, keycode, modifiers, grab_window, owner_events, pointer_mode,
keyboard_mode);
XGrabKey(dpy, keycode, modifiers | Mod2Mask, grab_window, owner_events, pointer_mode, keyboard_mode);
XGrabKey(dpy, keycode, modifiers | LockMask, grab_window, owner_events, pointer_mode, keyboard_mode);
XGrabKey(dpy, keycode, modifiers | LockMask | Mod2Mask, grab_window, owner_events, pointer_mode, keyboard_mode);
XSelectInput(dpy, root, KeyPressMask );
while(1)
{
XNextEvent(dpy, &ev);
switch(ev.type)
{
case KeyPress:
/**
* We don't need to test the kind of key here since we've only
* listened to one - albeit one with multiple modifier-masks
*/
fprintf(stderr, "Launching terminal!\n" );
system( "gnome-terminal" );
default:
break;
}
}
XCloseDisplay(dpy);
return 0;
}
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