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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;
int printUsage() {
printf("\
USAGE: xkbcat [-display <display>] [-up]\n\
display target X display (default %s)\n\
up also print key-ups (default %s)\n",
DEFAULT_DISPLAY, (DEFAULT_PRINT_UP ? "yes" : "no") );
exit(0);
}
int main(int argc, char * argv[]) {
const char * hostname = DEFAULT_DISPLAY;
bool printKeyUps = DEFAULT_PRINT_UP;
// Get arguments
for (int i = 1; i < argc; i++) {
if (!strcmp(argv[i], "-help")) printUsage();
else if (!strcmp(argv[i], "-display")) hostname = argv[++i];
else if (!strcmp(argv[i], "-up")) printKeyUps = true;
else { printf("Unexpected argument `%s`\n", argv[i]); printUsage(); }
}
// 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 xiOpcode, queryEvent, queryError;
if (! XQueryExtension(disp, "XInputExtension", &xiOpcode,
&queryEvent, &queryError)) {
fprintf(stderr, "X Input extension not available\n");
exit(2);
}
{ // Request XInput 2.0, guarding against changes in future versions
int major = 2, minor = 0;
int queryResult = XIQueryVersion(disp, &major, &minor);
if (queryResult == BadRequest) {
fprintf(stderr, "Need XI 2.0 support (got %d.%d)\n", major, minor);
exit(3);
} else if (queryResult != Success) {
fprintf(stderr, "Internal error\n");
exit(4);
}
}
// 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 ("forever") {
XEvent event;
XGenericEventCookie *cookie = (XGenericEventCookie*)&event.xcookie;
XNextEvent(disp, &event);
if (XGetEventData(disp, cookie) &&
cookie->type == GenericEvent &&
cookie->extension == xiOpcode) {
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 ? "+" : "-");
printf("%s\n", str);
break;
}
}
}
fflush(stdout);
}
}
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