2 * Copyright © 2012 Ran Benita <ran234@gmail.com>
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
35 #include <sys/epoll.h>
36 #include <linux/input.h>
43 struct xkb_state *state;
44 struct keyboard *next;
47 static bool terminate;
48 static int evdev_offset = 8;
49 static bool report_state_changes;
51 #define NLONGS(n) (((n) + LONG_BIT - 1) / LONG_BIT)
54 evdev_bit_is_set(const unsigned long *array, int bit)
56 return !!(array[bit / LONG_BIT] & (1LL << (bit % LONG_BIT)));
59 /* Some heuristics to see if the device is a keyboard. */
64 unsigned long evbits[NLONGS(EV_CNT)] = { 0 };
65 unsigned long keybits[NLONGS(KEY_CNT)] = { 0 };
68 ioctl(fd, EVIOCGBIT(0, sizeof(evbits)), evbits);
72 if (!evdev_bit_is_set(evbits, EV_KEY))
76 ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybits)), keybits);
80 for (i = KEY_RESERVED; i <= KEY_MIN_INTERESTING; i++)
81 if (evdev_bit_is_set(keybits, i))
88 keyboard_new(struct dirent *ent, struct xkb_keymap *xkb, struct keyboard **out)
93 struct xkb_state *state;
96 ret = asprintf(&path, "/dev/input/%s", ent->d_name);
100 fd = open(path, O_NONBLOCK | O_CLOEXEC | O_RDONLY);
106 if (!is_keyboard(fd)) {
107 /* Dummy "skip this device" value. */
112 state = xkb_state_new(xkb);
114 fprintf(stderr, "Couldn't create xkb state for %s\n", path);
119 kbd = calloc(1, sizeof(*kbd));
132 xkb_state_unref(state);
141 keyboard_free(struct keyboard *kbd)
148 xkb_state_unref(kbd->state);
153 filter_device_name(const struct dirent *ent)
155 return !fnmatch("event*", ent->d_name, 0);
158 static struct keyboard *
159 get_keyboards(struct xkb_keymap *keymap)
162 struct dirent **ents;
163 struct keyboard *kbds = NULL, *kbd = NULL;
165 nents = scandir("/dev/input", &ents, filter_device_name, alphasort);
167 fprintf(stderr, "Couldn't scan /dev/input: %s\n", strerror(errno));
171 for (i = 0; i < nents; i++) {
172 ret = keyboard_new(ents[i], keymap, &kbd);
174 if (ret == -EACCES) {
175 fprintf(stderr, "Couldn't open /dev/input/%s: %s. "
176 "You probably need root to run this.\n",
177 ents[i]->d_name, strerror(-ret));
180 if (ret != -ENOTSUP) {
181 fprintf(stderr, "Couldn't open /dev/input/%s: %s. Skipping.\n",
182 ents[i]->d_name, strerror(-ret));
192 fprintf(stderr, "Couldn't find any keyboards I can use! Quitting.\n");
197 for (i = 0; i < nents; i++)
204 free_keyboards(struct keyboard *kbds)
206 struct keyboard *next;
216 print_keycode(struct keyboard *kbd, xkb_keycode_t keycode)
219 struct xkb_keymap *keymap;
220 struct xkb_state *state;
222 const xkb_keysym_t *syms;
226 xkb_layout_index_t layout;
231 keymap = xkb_state_get_keymap(state);
233 nsyms = xkb_state_key_get_syms(state, keycode, &syms);
238 printf("keysyms [ ");
239 for (i = 0; i < nsyms; i++) {
240 xkb_keysym_get_name(syms[i], s, sizeof(s));
241 printf("%-*s ", (int)sizeof(s), s);
246 * Only do this if wchar_t is UCS-4, so we can be lazy and print
249 #ifdef __STDC_ISO_10646__
250 printf("unicode [ ");
251 for (i = 0; i < nsyms; i++) {
252 unicode = xkb_keysym_to_utf32(syms[i]);
253 printf("%lc ", (int)(unicode ? unicode : L' '));
258 layout = xkb_state_key_get_layout(state, keycode);
259 printf("layout [ %s (%d) ] ",
260 xkb_keymap_layout_get_name(keymap, layout), layout);
262 printf("level [ %d ] ",
263 xkb_state_key_get_level(state, keycode, layout));
266 for (mod = 0; mod < xkb_keymap_num_mods(keymap); mod++) {
267 if (xkb_state_mod_index_is_active(state, mod,
268 XKB_STATE_MODS_EFFECTIVE) <= 0)
270 if (xkb_state_mod_index_is_consumed(state, keycode, mod))
271 printf("-%s ", xkb_keymap_mod_get_name(keymap, mod));
273 printf("%s ", xkb_keymap_mod_get_name(keymap, mod));
278 for (led = 0; led < xkb_keymap_num_leds(keymap); led++) {
279 if (xkb_state_led_index_is_active(state, led) <= 0)
281 printf("%s ", xkb_keymap_led_get_name(keymap, led));
289 print_state_changes(enum xkb_state_component changed)
294 printf("changed [ ");
295 if (changed & XKB_STATE_LAYOUT_EFFECTIVE)
296 printf("effective-layout ");
297 if (changed & XKB_STATE_LAYOUT_DEPRESSED)
298 printf("depressed-layout ");
299 if (changed & XKB_STATE_LAYOUT_LATCHED)
300 printf("latched-layout ");
301 if (changed & XKB_STATE_LAYOUT_LOCKED)
302 printf("locked-layout ");
303 if (changed & XKB_STATE_MODS_EFFECTIVE)
304 printf("effective-mods ");
305 if (changed & XKB_STATE_MODS_DEPRESSED)
306 printf("depressed-mods ");
307 if (changed & XKB_STATE_MODS_LATCHED)
308 printf("latched-mods ");
309 if (changed & XKB_STATE_MODS_LOCKED)
310 printf("locked-mods ");
311 if (changed & XKB_STATE_LEDS)
316 /* The meaning of the input_event 'value' field. */
318 KEY_STATE_RELEASE = 0,
320 KEY_STATE_REPEAT = 2,
324 process_event(struct keyboard *kbd, uint16_t type, uint16_t code, int32_t value)
326 xkb_keycode_t keycode;
327 struct xkb_keymap *keymap;
328 enum xkb_state_component changed;
333 keycode = evdev_offset + code;
334 keymap = xkb_state_get_keymap(kbd->state);
336 if (value == KEY_STATE_REPEAT && !xkb_keymap_key_repeats(keymap, keycode))
339 if (value != KEY_STATE_RELEASE)
340 print_keycode(kbd, keycode);
342 if (value == KEY_STATE_RELEASE)
343 changed = xkb_state_update_key(kbd->state, keycode, XKB_KEY_UP);
345 changed = xkb_state_update_key(kbd->state, keycode, XKB_KEY_DOWN);
347 if (report_state_changes)
348 print_state_changes(changed);
352 read_keyboard(struct keyboard *kbd)
356 struct input_event evs[16];
359 /* No fancy error checking here. */
360 while ((len = read(kbd->fd, &evs, sizeof(evs))) > 0) {
361 nevs = len / sizeof(struct input_event);
362 for (i = 0; i < nevs; i++)
363 process_event(kbd, evs[i].type, evs[i].code, evs[i].value);
366 if (len < 0 && errno != EWOULDBLOCK) {
367 fprintf(stderr, "Couldn't read %s: %s\n", kbd->path,
376 loop(struct keyboard *kbds)
380 struct keyboard *kbd;
381 struct epoll_event ev;
382 struct epoll_event evs[16];
384 epfd = epoll_create1(0);
386 fprintf(stderr, "Couldn't create epoll instance: %s\n",
391 for (kbd = kbds; kbd; kbd = kbd->next) {
392 memset(&ev, 0, sizeof(ev));
395 ret = epoll_ctl(epfd, EPOLL_CTL_ADD, kbd->fd, &ev);
398 fprintf(stderr, "Couldn't add %s to epoll: %s\n",
399 kbd->path, strerror(errno));
405 ret = epoll_wait(epfd, evs, 16, -1);
410 fprintf(stderr, "Couldn't poll for events: %s\n",
415 for (i = 0; i < ret; i++) {
416 kbd = evs[i].data.ptr;
417 ret = read_keyboard(kbd);
433 sigintr_handler(int signum)
439 main(int argc, char *argv[])
443 struct keyboard *kbds;
444 struct xkb_context *ctx;
445 struct xkb_keymap *keymap;
446 const char *rules = NULL;
447 const char *model = NULL;
448 const char *layout = NULL;
449 const char *variant = NULL;
450 const char *options = NULL;
451 const char *keymap_path = NULL;
452 struct sigaction act;
454 setlocale(LC_ALL, "");
456 while ((opt = getopt(argc, argv, "r:m:l:v:o:k:n:c")) != -1) {
474 keymap_path = optarg;
478 evdev_offset = strtol(optarg, NULL, 10);
480 fprintf(stderr, "error: -n option expects a number\n");
485 report_state_changes = true;
488 fprintf(stderr, " Usage: %s [-r <rules>] [-m <model>] "
489 "[-l <layout>] [-v <variant>] [-o <options>]\n",
491 fprintf(stderr, " or: %s -k <path to keymap file>\n",
493 fprintf(stderr, "For both: -n <evdev keycode offset>\n"
494 " -c (to report changes to the state)\n");
499 ctx = test_get_context();
502 fprintf(stderr, "Couldn't create xkb context\n");
507 FILE *file = fopen(keymap_path, "r");
510 fprintf(stderr, "Couldn't open '%s': %s\n",
511 keymap_path, strerror(errno));
514 keymap = xkb_keymap_new_from_file(ctx, file,
515 XKB_KEYMAP_FORMAT_TEXT_V1, 0);
519 keymap = test_compile_rules(ctx, rules, model, layout, variant,
525 fprintf(stderr, "Couldn't create xkb keymap\n");
529 kbds = get_keyboards(keymap);
535 act.sa_handler = sigintr_handler;
536 sigemptyset(&act.sa_mask);
538 sigaction(SIGINT, &act, NULL);
539 sigaction(SIGTERM, &act, NULL);
541 /* Instead of fiddling with termios.. */
542 system("stty -echo");
550 free_keyboards(kbds);
552 xkb_keymap_unref(keymap);
554 xkb_context_unref(ctx);
556 exit(ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE);