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// xkbcat: Logs X11 keypresses, globally.
#include <X11/XKBlib.h>
#include <X11/extensions/XInput2.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
const char * DEFAULT_DISPLAY = ":0";
const bool DEFAULT_PRINT_UP = false;
char * get_key() {
const char * hostname = DEFAULT_DISPLAY;
bool printKeyUps = DEFAULT_PRINT_UP;
// Set up X
Display * disp = XOpenDisplay(hostname);
if (NULL == disp) {
fprintf(stderr, "Cannot open X display: %s\n", hostname);
exit(1);
}
// Test for XInput 2 extension
int xi_opcode;
int queryEvent, queryError;
if (! XQueryExtension(disp, "XInputExtension", &xi_opcode,
&queryEvent, &queryError)) {
// XXX Test version >=2
fprintf(stderr, "X Input extension not available\n"); return "";
}
// Register events
Window root = DefaultRootWindow(disp);
XIEventMask m;
m.deviceid = XIAllMasterDevices;
m.mask_len = XIMaskLen(XI_LASTEVENT);
m.mask = calloc(m.mask_len, sizeof(char));
XISetMask(m.mask, XI_RawKeyPress);
XISetMask(m.mask, XI_RawKeyRelease);
XISelectEvents(disp, root, &m, 1);
XSync(disp, false);
free(m.mask);
while (1) { // Forever
XEvent event;
XGenericEventCookie *cookie = (XGenericEventCookie*)&event.xcookie;
XNextEvent(disp, &event);
if (XGetEventData(disp, cookie) &&
cookie->type == GenericEvent &&
cookie->extension == xi_opcode)
{
switch (cookie->evtype)
{
case XI_RawKeyRelease: if (!printKeyUps) continue;
case XI_RawKeyPress: {
XIRawEvent *ev = cookie->data;
// Ask X what it calls that key
KeySym s = XkbKeycodeToKeysym(disp, ev->detail, 0, 0);
if (NoSymbol == s) continue;
char *str = XKeysymToString(s);
if (NULL == str) continue;
if (printKeyUps) printf("%s", cookie->evtype == XI_RawKeyPress ? "+" : "-");
char *ret = malloc(1000);
sprintf(ret, "%s", str);
XCloseDisplay(disp);
return ret;
break;
}
}
}
fflush(stdout);
}
}
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