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/.gitignore
master
Ran Benita 2012-04-08 02:20:39 +03:00 committed by Daniel Stone
parent 41d9afc556
commit 4c21275301
3 changed files with 498 additions and 1 deletions

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@ -131,8 +131,11 @@ test_dump_LDADD = $(TESTS_LDADD)
test_stringcomp_LDADD = $(TESTS_LDADD) test_stringcomp_LDADD = $(TESTS_LDADD)
test_keyseq_LDADD = $(TESTS_LDADD) test_keyseq_LDADD = $(TESTS_LDADD)
test_log_LDADD = $(TESTS_LDADD) test_log_LDADD = $(TESTS_LDADD)
test_interactive_LDADD = $(TESTS_LDADD)
check_PROGRAMS = $(TESTS) check_PROGRAMS = \
$(TESTS) \
test/interactive
EXTRA_DIST = \ EXTRA_DIST = \
test/data \ test/data \

1
test/.gitignore vendored
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@ -12,3 +12,4 @@ stringcomp
dump dump
keyseq keyseq
log log
interactive

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