Attachment 128764 Details for Bug 99280 – test program to reproduce the issue

test program to reproduce the issue

grabtest.c (text/x-csrc), 2.08 KB, created by Jordan Torbiak on 2017-01-05 05:34:02 UTC

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Creator: Jordan Torbiak

Created: 2017-01-05 05:34:02 UTC

Size: 2.08 KB

patch

obsolete

>// grabtest tries to reproduce an X11 bug where, when two keys grabbed using
>// XGrabKey are held down and then quickly released, the second KeyRelease
>// event never makes it to the event queue.
>//
>// make CFLAGS=-std=c99 LDFLAGS=-lX11\ -lXtst grabtest
>
>#include <unistd.h>
>#include <stdio.h>
>#include <assert.h>
>#include <X11/Xlib.h>
>#include <X11/keysym.h>
>#include <X11/extensions/XTest.h>
>
>#define LEN(X) (sizeof(X) / sizeof(X[0]))
>#define PRESS 1
>#define RELEASE 0
>
>Display *dpy;
>Window root;
>int screen;
>
>void
>read_n_key_events(int n)
>{
>	for (int i = 0; i < n; i++) {
>		XEvent ev;
>		XMaskEvent(dpy, KeyPressMask|KeyReleaseMask, &ev);
>		KeySym keysym = XLookupKeysym(&ev.xkey, 0);
>		int ispress = ev.type == KeyPress;
>		printf("%s %s\n",  ispress ? "press" : "release", XKeysymToString(keysym));
>	}
>}
>
>int
>main()
>{
>	dpy = XOpenDisplay(NULL);
>	assert(dpy);
>	root = DefaultRootWindow(dpy);
>	screen = DefaultScreen(dpy);
>
>	XSelectInput(dpy, root, KeyPressMask|KeyReleaseMask);
>
>	KeySym keysyms[] = {XK_d, XK_f};
>
>	// Grab keys.
>	unsigned modifiers = 0;
>	for (int i = 0; i < LEN(keysyms); i++) {
>		KeyCode keycode = XKeysymToKeycode(dpy, keysyms[i]);
>		int ok = XGrabKey(dpy, keycode, modifiers, root, True, GrabModeAsync, GrabModeAsync);
>		assert(ok);
>		XKeyboardControl ctrl = {.key=keycode, .auto_repeat_mode=AutoRepeatModeOff};
>		XChangeKeyboardControl(dpy, KBKey|KBAutoRepeatMode, &ctrl);
>	}
>
>	// Hold keys d and f, then quickly release them.
>	KeyCode d = XKeysymToKeycode(dpy, XK_d);
>	KeyCode f = XKeysymToKeycode(dpy, XK_f);
>	XTestFakeKeyEvent(dpy, d, PRESS, CurrentTime);
>	XTestFakeKeyEvent(dpy, f, PRESS, CurrentTime);
>	XTestFakeKeyEvent(dpy, d, RELEASE, CurrentTime);
>	XFlush(dpy);
>	read_n_key_events(3);
>	XTestFakeKeyEvent(dpy, f, RELEASE, CurrentTime);
>	XFlush(dpy);
>	read_n_key_events(1);
>
>	// Clean up.
>	for (int i = 0; i < LEN(keysyms); i++) {
>		KeyCode keycode = XKeysymToKeycode(dpy, keysyms[i]);
>		XKeyboardControl ctrl = {.key=keycode, .auto_repeat_mode=AutoRepeatModeDefault};
>		XChangeKeyboardControl(dpy, KBKey|KBAutoRepeatMode, &ctrl);
>		XUngrabKey(dpy, keycode, modifiers, root);
>	}
>	XFlush(dpy);
>}

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