Add an interactive evdev test
The program reads key events from evdev input devices, puts them through the library and prints some information about them. It's nice for experimenting, quick testing and trying to break it with random stuff (already found some!). It is called "interactive" for lack of a better name. It's a bit hackish, but can easily be extended, made more portable etc, in the future. Signed-off-by: Ran Benita <ran234@gmail.com> Conflicts: Makefile.am test/.gitignoremaster
Ran Benita
Daniel Stone
parent
41d9afc556
commit
4c21275301
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@ -131,8 +131,11 @@ test_dump_LDADD = $(TESTS_LDADD)
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test_stringcomp_LDADD = $(TESTS_LDADD)
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test_keyseq_LDADD = $(TESTS_LDADD)
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test_log_LDADD = $(TESTS_LDADD)
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test_interactive_LDADD = $(TESTS_LDADD)
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check_PROGRAMS = $(TESTS)
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check_PROGRAMS = \
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$(TESTS) \
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test/interactive
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EXTRA_DIST = \
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test/data \
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@ -12,3 +12,4 @@ stringcomp
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dump
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keyseq
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log
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interactive
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@ -0,0 +1,493 @@
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/*
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* Copyright © 2012 Ran Benita <ran234@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fnmatch.h>
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#include <limits.h>
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#include <locale.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <sys/epoll.h>
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#include <linux/input.h>
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#include "xkbcommon/xkbcommon.h"
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struct keyboard {
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char *path;
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int fd;
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struct xkb_state *state;
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struct keyboard *next;
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};
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bool terminate;
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#define NLONGS(n) (((n) + LONG_BIT - 1) / LONG_BIT)
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static bool
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evdev_bit_is_set(const unsigned long *array, int bit)
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{
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return !!(array[bit / LONG_BIT] & (1LL << (bit % LONG_BIT)));
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}
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/* Some heuristics to see if the device is a keyboard. */
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static bool
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is_keyboard(int fd)
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{
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int i;
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unsigned long evbits[NLONGS(EV_CNT)] = { 0 };
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unsigned long keybits[NLONGS(KEY_CNT)] = { 0 };
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errno = 0;
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ioctl(fd, EVIOCGBIT(0, sizeof(evbits)), evbits);
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if (errno)
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return false;
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if (!evdev_bit_is_set(evbits, EV_KEY))
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return false;
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errno = 0;
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ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybits)), keybits);
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if (errno)
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return false;
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for (i = KEY_RESERVED; i <= KEY_MIN_INTERESTING; i++)
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if (evdev_bit_is_set(keybits, i))
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return true;
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return false;
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}
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static int
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keyboard_new(struct dirent *ent, struct xkb_keymap *xkb, struct keyboard **out)
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{
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int ret;
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char *path;
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int fd;
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struct xkb_state *state;
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struct keyboard *kbd;
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ret = asprintf(&path, "/dev/input/%s", ent->d_name);
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if (ret < 0)
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return -ENOMEM;
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fd = open(path, O_NONBLOCK | O_CLOEXEC | O_RDONLY);
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if (fd < 0) {
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ret = -errno;
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goto err_path;
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}
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if (!is_keyboard(fd)) {
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/* Dummy "skip this device" value. */
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ret = -ENOTSUP;
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goto err_fd;
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}
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state = xkb_state_new(xkb);
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if (!state) {
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fprintf(stderr, "Couldn't create xkb state for %s\n", path);
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ret = -EFAULT;
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goto err_fd;
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}
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kbd = calloc(1, sizeof(*kbd));
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if (!kbd) {
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ret = -ENOMEM;
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goto err_state;
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}
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kbd->path = path;
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kbd->fd = fd;
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kbd->state = state;
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*out = kbd;
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return 0;
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err_state:
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xkb_state_unref(state);
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err_fd:
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close(fd);
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err_path:
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free(path);
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return ret;
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}
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static void
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keyboard_free(struct keyboard *kbd)
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{
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if (!kbd)
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return;
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if (kbd->fd >= 0)
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close(kbd->fd);
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free(kbd->path);
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xkb_state_unref(kbd->state);
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free(kbd);
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}
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static int
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filter_device_name(const struct dirent *ent)
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{
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return !fnmatch("event*", ent->d_name, 0);
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}
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static struct keyboard *
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get_keyboards(struct xkb_keymap *xkb)
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{
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int ret, i, nents;
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struct dirent **ents;
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struct keyboard *kbds = NULL, *kbd = NULL;
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nents = scandir("/dev/input", &ents, filter_device_name, alphasort);
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if (nents < 0) {
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fprintf(stderr, "Couldn't scan /dev/input: %s\n", strerror(errno));
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return NULL;
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}
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for (i = 0; i < nents; i++) {
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ret = keyboard_new(ents[i], xkb, &kbd);
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if (ret) {
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if (ret == -EACCES) {
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fprintf(stderr, "Couldn't open /dev/input/%s: %s. "
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"You probably need root to run this.\n",
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ents[i]->d_name, strerror(-ret));
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break;
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}
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if (ret != -ENOTSUP) {
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fprintf(stderr, "Couldn't open /dev/input/%s: %s. Skipping.\n",
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ents[i]->d_name, strerror(-ret));
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}
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continue;
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}
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kbd->next = kbds;
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kbds = kbd;
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}
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if (!kbds) {
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fprintf(stderr, "Couldn't find any keyboards I can use! Quitting.\n");
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goto err;
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}
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err:
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for (i = 0; i < nents; i++)
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free(ents[i]);
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free(ents);
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return kbds;
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}
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static void
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free_keyboards(struct keyboard *kbds)
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{
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struct keyboard *next;
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while (kbds) {
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next = kbds->next;
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keyboard_free(kbds);
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kbds = next;
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}
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}
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static void
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print_keycode(struct keyboard *kbd, xkb_keycode_t keycode)
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{
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unsigned int i;
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struct xkb_keymap *xkb;
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struct xkb_state *state;
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const xkb_keysym_t *syms;
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unsigned int nsyms;
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char s[16];
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uint32_t unicode;
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xkb_group_index_t group;
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xkb_mod_index_t mod;
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xkb_led_index_t led;
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state = kbd->state;
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xkb = xkb_state_get_map(state);
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nsyms = xkb_key_get_syms(state, keycode, &syms);
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if (nsyms <= 0)
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return;
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printf("keysyms [ ");
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for (i = 0; i < nsyms; i++) {
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xkb_keysym_get_name(syms[i], s, sizeof(s));
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printf("%-*s ", (int)sizeof(s), s);
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}
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printf("] ");
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/*
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* Only do this if wchar_t is UCS-4, so we can be lazy and print
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* with %lc.
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*/
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#ifdef __STDC_ISO_10646__
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printf("unicode [ ");
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for (i = 0; i < nsyms; i++) {
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unicode = xkb_keysym_to_utf32(syms[i]);
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printf("%lc ", (int)(unicode ? unicode : L' '));
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}
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printf("] ");
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#endif
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printf("groups [ ");
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for (group = 0; group < xkb_map_num_groups(xkb); group++) {
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if (!xkb_state_group_index_is_active(state, group, XKB_STATE_EFFECTIVE))
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continue;
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printf("%s (%d) ", xkb_map_group_get_name(xkb, group), group);
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}
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printf("] ");
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printf("mods [ ");
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for (mod = 0; mod < xkb_map_num_mods(xkb); mod++) {
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if (!xkb_state_mod_index_is_active(state, mod, XKB_STATE_EFFECTIVE))
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continue;
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printf("%s ", xkb_map_mod_get_name(xkb, mod));
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}
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printf("] ");
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printf("leds [ ");
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for (led = 0; led < xkb_map_num_leds(xkb); led++) {
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if (!xkb_state_led_index_is_active(state, led))
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continue;
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printf("%s ", xkb_map_led_get_name(xkb, led));
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}
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printf("] ");
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printf("\n");
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}
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/* The meaning of the input_event 'value' field. */
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enum {
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KEY_STATE_RELEASE = 0,
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KEY_STATE_PRESS = 1,
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KEY_STATE_REPEAT = 2,
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};
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#define EVDEV_OFFSET 8
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static void
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process_event(struct keyboard *kbd, uint16_t type, uint16_t code, int32_t value)
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{
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xkb_keycode_t keycode;
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struct xkb_keymap *keymap;
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if (type != EV_KEY)
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return;
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keycode = EVDEV_OFFSET + code;
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keymap = xkb_state_get_map(kbd->state);
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if (value == KEY_STATE_REPEAT && !xkb_key_repeats(keymap, keycode))
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return;
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if (value != KEY_STATE_RELEASE)
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print_keycode(kbd, keycode);
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if (value == KEY_STATE_RELEASE)
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xkb_state_update_key(kbd->state, keycode, XKB_KEY_UP);
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else
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xkb_state_update_key(kbd->state, keycode, XKB_KEY_DOWN);
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}
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static int
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read_keyboard(struct keyboard *kbd)
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{
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size_t i;
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ssize_t len;
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struct input_event evs[16];
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size_t nevs;
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/* No fancy error checking here. */
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while ((len = read(kbd->fd, &evs, sizeof(evs))) > 0) {
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nevs = len / sizeof(struct input_event);
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for (i = 0; i < nevs; i++)
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process_event(kbd, evs[i].type, evs[i].code, evs[i].value);
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}
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if (len < 0 && errno != EWOULDBLOCK) {
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fprintf(stderr, "Couldn't read %s: %s\n", kbd->path,
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strerror(errno));
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return -errno;
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}
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return 0;
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}
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static int
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loop(struct keyboard *kbds)
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{
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int i, ret;
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int epfd;
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struct keyboard *kbd;
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struct epoll_event ev;
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struct epoll_event evs[16];
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epfd = epoll_create1(0);
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if (epfd < 0) {
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fprintf(stderr, "Couldn't create epoll instance: %s\n",
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strerror(errno));
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return -errno;
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}
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for (kbd = kbds; kbd; kbd = kbd->next) {
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memset(&ev, 0, sizeof(ev));
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ev.events = EPOLLIN;
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ev.data.ptr = kbd;
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ret = epoll_ctl(epfd, EPOLL_CTL_ADD, kbd->fd, &ev);
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if (ret) {
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ret = -errno;
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fprintf(stderr, "Couldn't add %s to epoll: %s\n",
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kbd->path, strerror(errno));
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goto err_epoll;
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}
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}
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while (!terminate) {
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ret = epoll_wait(epfd, evs, 16, -1);
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if (ret < 0) {
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if (errno == EINTR)
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continue;
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ret = -errno;
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fprintf(stderr, "Couldn't poll for events: %s\n",
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strerror(errno));
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goto err_epoll;
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}
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for (i = 0; i < ret; i++) {
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kbd = evs[i].data.ptr;
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ret = read_keyboard(kbd);
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if (ret) {
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goto err_epoll;
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}
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}
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}
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close(epfd);
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return 0;
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err_epoll:
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close(epfd);
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return ret;
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}
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static void
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sigintr_handler(int signum)
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{
|
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terminate = true;
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}
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int
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main(int argc, char *argv[])
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{
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int ret;
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int opt;
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struct keyboard *kbds;
|
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struct xkb_context *context;
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struct xkb_keymap *xkb;
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struct xkb_rule_names names = {
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.rules = "evdev",
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.model = "evdev",
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.layout = "us",
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.variant = "",
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.options = "",
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};
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struct sigaction act;
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setlocale(LC_ALL, "");
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while ((opt = getopt(argc, argv, "r:m:l:v:o:")) != -1) {
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switch (opt) {
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case 'r':
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names.rules = optarg;
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break;
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case 'm':
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names.model = optarg;
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break;
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case 'l':
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names.layout = optarg;
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break;
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case 'v':
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names.variant = optarg;
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break;
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case 'o':
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names.options = optarg;
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break;
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case '?':
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fprintf(stderr, "Usage: %s [-r <rules>] [-m <model>] "
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"[-l <layout>] [-v <variant>] [-o <options>]\n",
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argv[0]);
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exit(EX_USAGE);
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}
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}
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context = xkb_context_new(0);
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if (!context) {
|
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ret = -1;
|
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fprintf(stderr, "Couldn't create xkb context\n");
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goto err_out;
|
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}
|
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|
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xkb = xkb_map_new_from_names(context, &names, 0);
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if (!xkb) {
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ret = -1;
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fprintf(stderr, "Couldn't create xkb keymap\n");
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goto err_ctx;
|
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}
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kbds = get_keyboards(xkb);
|
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if (!kbds) {
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ret = -1;
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goto err_xkb;
|
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}
|
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act.sa_handler = sigintr_handler;
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sigemptyset(&act.sa_mask);
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act.sa_flags = 0;
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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|
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/* Instead of fiddling with termios.. */
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system("stty -echo");
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ret = loop(kbds);
|
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if (ret) {
|
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goto err_stty;
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}
|
||||
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err_stty:
|
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system("stty echo");
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free_keyboards(kbds);
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err_xkb:
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xkb_map_unref(xkb);
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err_ctx:
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xkb_context_unref(context);
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err_out:
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exit(ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
|
||||
}
|
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Reference in New Issue