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libxkbcommon/tools/interactive-evdev.c

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/*
* 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 "config.h"
#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <getopt.h>
#include <limits.h>
#include <locale.h>
#include <poll.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/input.h>
#include "xkbcommon/xkbcommon.h"
#include "tools-common.h"
struct keyboard {
char *path;
int fd;
struct xkb_state *state;
struct xkb_compose_state *compose_state;
struct keyboard *next;
};
static bool terminate;
static int evdev_offset = 8;
static bool report_state_changes;
static bool with_compose;
static enum xkb_consumed_mode consumed_mode = XKB_CONSUMED_MODE_XKB;
#ifdef ENABLE_PRIVATE_APIS
#define DEFAULT_PRINT_FIELDS (PRINT_ALL_FIELDS & ~PRINT_MODMAPS)
#else
#define DEFAULT_PRINT_FIELDS PRINT_ALL_FIELDS
#endif
print_state_fields_mask_t print_fields = DEFAULT_PRINT_FIELDS;
#define DEFAULT_INCLUDE_PATH_PLACEHOLDER "__defaults__"
#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 *keymap,
struct xkb_compose_table *compose_table, struct keyboard **out)
{
int ret;
char *path;
int fd;
struct xkb_state *state;
struct xkb_compose_state *compose_state = NULL;
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(keymap);
if (!state) {
fprintf(stderr, "Couldn't create xkb state for %s\n", path);
ret = -EFAULT;
goto err_fd;
}
if (with_compose) {
compose_state = xkb_compose_state_new(compose_table,
XKB_COMPOSE_STATE_NO_FLAGS);
if (!compose_state) {
fprintf(stderr, "Couldn't create compose state for %s\n", path);
ret = -EFAULT;
goto err_state;
}
}
kbd = calloc(1, sizeof(*kbd));
if (!kbd) {
ret = -ENOMEM;
goto err_compose_state;
}
kbd->path = path;
kbd->fd = fd;
kbd->state = state;
kbd->compose_state = compose_state;
*out = kbd;
return 0;
err_compose_state:
xkb_compose_state_unref(compose_state);
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);
xkb_compose_state_unref(kbd->compose_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 *keymap,
struct xkb_compose_table *compose_table)
{
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], keymap, compose_table, &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;
}
assert(kbd != NULL);
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;
}
}
/* The meaning of the input_event 'value' field. */
enum {
KEY_STATE_RELEASE = 0,
KEY_STATE_PRESS = 1,
KEY_STATE_REPEAT = 2,
};
static void
process_event(struct keyboard *kbd, uint16_t type, uint16_t code, int32_t value)
{
xkb_keycode_t keycode;
struct xkb_keymap *keymap;
enum xkb_state_component changed;
enum xkb_compose_status status;
if (type != EV_KEY)
return;
keycode = evdev_offset + code;
keymap = xkb_state_get_keymap(kbd->state);
if (value == KEY_STATE_REPEAT && !xkb_keymap_key_repeats(keymap, keycode))
return;
if (with_compose && value != KEY_STATE_RELEASE) {
xkb_keysym_t keysym = xkb_state_key_get_one_sym(kbd->state, keycode);
xkb_compose_state_feed(kbd->compose_state, keysym);
}
if (value != KEY_STATE_RELEASE) {
tools_print_keycode_state(
kbd->state, kbd->compose_state, keycode,
consumed_mode, print_fields
);
}
if (with_compose) {
status = xkb_compose_state_get_status(kbd->compose_state);
if (status == XKB_COMPOSE_CANCELLED || status == XKB_COMPOSE_COMPOSED)
xkb_compose_state_reset(kbd->compose_state);
}
if (value == KEY_STATE_RELEASE)
changed = xkb_state_update_key(kbd->state, keycode, XKB_KEY_UP);
else
changed = xkb_state_update_key(kbd->state, keycode, XKB_KEY_DOWN);
if (report_state_changes)
tools_print_state_changes(changed);
}
static int
read_keyboard(struct keyboard *kbd)
{
ssize_t len;
struct input_event evs[16];
/* No fancy error checking here. */
while ((len = read(kbd->fd, &evs, sizeof(evs))) > 0) {
const size_t nevs = len / sizeof(struct input_event);
for (size_t 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 1;
}
return 0;
}
static int
loop(struct keyboard *kbds)
{
int ret = -1;
struct keyboard *kbd;
nfds_t nfds, i;
struct pollfd *fds = NULL;
for (kbd = kbds, nfds = 0; kbd; kbd = kbd->next, nfds++) {}
fds = calloc(nfds, sizeof(*fds));
if (fds == NULL) {
fprintf(stderr, "Out of memory");
goto out;
}
for (i = 0, kbd = kbds; kbd; kbd = kbd->next, i++) {
fds[i].fd = kbd->fd;
fds[i].events = POLLIN;
}
while (!terminate) {
ret = poll(fds, nfds, -1);
if (ret < 0) {
if (errno == EINTR)
continue;
fprintf(stderr, "Couldn't poll for events: %s\n",
strerror(errno));
goto out;
}
for (i = 0, kbd = kbds; kbd; kbd = kbd->next, i++) {
if (fds[i].revents != 0) {
ret = read_keyboard(kbd);
if (ret) {
goto out;
}
}
}
}
ret = 0;
out:
free(fds);
return ret;
}
static void
sigintr_handler(int signum)
{
terminate = true;
}
static void
usage(FILE *fp, char *progname)
{
fprintf(fp, "Usage: %s [--include=<path>] [--include-defaults] "
"[--rules=<rules>] [--model=<model>] [--layout=<layout>] "
"[--variant=<variant>] [--options=<options>]\n",
progname);
fprintf(fp, " or: %s --keymap <path to keymap file>\n",
progname);
fprintf(fp, "For both:\n"
#ifdef ENABLE_PRIVATE_APIS
" --print-modmaps (print real & virtual key modmaps)\n"
#endif
" --short (do not print layout nor Unicode keysym translation)\n"
" --report-state-changes (report changes to the state)\n"
" --enable-compose (enable Compose)\n"
" --consumed-mode={xkb|gtk} (select the consumed modifiers mode, default: xkb)\n"
" --without-x11-offset (don't add X11 keycode offset)\n"
"Other:\n"
" --help (display this help and exit)\n"
);
}
int
main(int argc, char *argv[])
{
int ret = EXIT_FAILURE;
struct keyboard *kbds;
struct xkb_context *ctx = NULL;
struct xkb_keymap *keymap = NULL;
struct xkb_compose_table *compose_table = NULL;
const char *includes[64];
size_t num_includes = 0;
const char *rules = NULL;
const char *model = NULL;
const char *layout = NULL;
const char *variant = NULL;
const char *options = NULL;
const char *keymap_path = NULL;
const char *locale;
struct sigaction act;
enum options {
OPT_INCLUDE,
OPT_INCLUDE_DEFAULTS,
OPT_RULES,
OPT_MODEL,
OPT_LAYOUT,
OPT_VARIANT,
OPT_OPTION,
OPT_KEYMAP,
OPT_WITHOUT_X11_OFFSET,
OPT_CONSUMED_MODE,
OPT_COMPOSE,
OPT_SHORT,
OPT_REPORT_STATE,
#ifdef ENABLE_PRIVATE_APIS
OPT_PRINT_MODMAPS,
#endif
};
static struct option opts[] = {
{"help", no_argument, 0, 'h'},
{"include", required_argument, 0, OPT_INCLUDE},
{"include-defaults", no_argument, 0, OPT_INCLUDE_DEFAULTS},
{"rules", required_argument, 0, OPT_RULES},
{"model", required_argument, 0, OPT_MODEL},
{"layout", required_argument, 0, OPT_LAYOUT},
{"variant", required_argument, 0, OPT_VARIANT},
{"options", required_argument, 0, OPT_OPTION},
{"keymap", required_argument, 0, OPT_KEYMAP},
{"consumed-mode", required_argument, 0, OPT_CONSUMED_MODE},
{"enable-compose", no_argument, 0, OPT_COMPOSE},
{"short", no_argument, 0, OPT_SHORT},
{"report-state-changes", no_argument, 0, OPT_REPORT_STATE},
{"without-x11-offset", no_argument, 0, OPT_WITHOUT_X11_OFFSET},
#ifdef ENABLE_PRIVATE_APIS
{"print-modmaps", no_argument, 0, OPT_PRINT_MODMAPS},
#endif
{0, 0, 0, 0},
};
setlocale(LC_ALL, "");
while (1) {
int opt;
int option_index = 0;
opt = getopt_long(argc, argv, "h", opts, &option_index);
if (opt == -1)
break;
switch (opt) {
case OPT_INCLUDE:
if (num_includes >= ARRAY_SIZE(includes)) {
fprintf(stderr, "error: too many includes\n");
exit(EXIT_INVALID_USAGE);
}
includes[num_includes++] = optarg;
break;
case OPT_INCLUDE_DEFAULTS:
if (num_includes >= ARRAY_SIZE(includes)) {
fprintf(stderr, "error: too many includes\n");
exit(EXIT_INVALID_USAGE);
}
includes[num_includes++] = DEFAULT_INCLUDE_PATH_PLACEHOLDER;
break;
case OPT_RULES:
rules = optarg;
break;
case OPT_MODEL:
model = optarg;
break;
case OPT_LAYOUT:
layout = optarg;
break;
case OPT_VARIANT:
variant = optarg;
break;
case OPT_OPTION:
options = optarg;
break;
case OPT_KEYMAP:
keymap_path = optarg;
break;
case OPT_WITHOUT_X11_OFFSET:
evdev_offset = 0;
break;
case OPT_REPORT_STATE:
report_state_changes = true;
break;
case OPT_COMPOSE:
with_compose = true;
break;
case OPT_SHORT:
print_fields &= ~PRINT_VERBOSE_FIELDS;
break;
case OPT_CONSUMED_MODE:
if (strcmp(optarg, "gtk") == 0) {
consumed_mode = XKB_CONSUMED_MODE_GTK;
} else if (strcmp(optarg, "xkb") == 0) {
consumed_mode = XKB_CONSUMED_MODE_XKB;
} else {
fprintf(stderr, "error: invalid --consumed-mode \"%s\"\n", optarg);
usage(stderr, argv[0]);
return EXIT_INVALID_USAGE;
}
break;
#ifdef ENABLE_PRIVATE_APIS
case OPT_PRINT_MODMAPS:
print_fields |= PRINT_MODMAPS;
break;
#endif
case 'h':
usage(stdout, argv[0]);
return EXIT_SUCCESS;
case '?':
usage(stderr, argv[0]);
return EXIT_INVALID_USAGE;
}
}
ctx = xkb_context_new(XKB_CONTEXT_NO_DEFAULT_INCLUDES);
if (!ctx) {
fprintf(stderr, "Couldn't create xkb context\n");
goto out;
}
if (num_includes == 0)
includes[num_includes++] = DEFAULT_INCLUDE_PATH_PLACEHOLDER;
for (size_t i = 0; i < num_includes; i++) {
const char *include = includes[i];
if (strcmp(include, DEFAULT_INCLUDE_PATH_PLACEHOLDER) == 0)
xkb_context_include_path_append_default(ctx);
else
xkb_context_include_path_append(ctx, include);
}
if (keymap_path) {
FILE *file = fopen(keymap_path, "rb");
if (!file) {
fprintf(stderr, "Couldn't open '%s': %s\n",
keymap_path, strerror(errno));
goto out;
}
keymap = xkb_keymap_new_from_file(ctx, file,
XKB_KEYMAP_FORMAT_TEXT_V1,
XKB_KEYMAP_COMPILE_NO_FLAGS);
fclose(file);
}
else {
struct xkb_rule_names rmlvo = {
.rules = (rules == NULL || rules[0] == '\0') ? NULL : rules,
.model = (model == NULL || model[0] == '\0') ? NULL : model,
.layout = (layout == NULL || layout[0] == '\0') ? NULL : layout,
.variant = (variant == NULL || variant[0] == '\0') ? NULL : variant,
.options = (options == NULL || options[0] == '\0') ? NULL : options
};
if (!rules && !model && !layout && !variant && !options)
keymap = xkb_keymap_new_from_names(ctx, NULL, 0);
else
keymap = xkb_keymap_new_from_names(ctx, &rmlvo, 0);
if (!keymap) {
fprintf(stderr,
"Failed to compile RMLVO: '%s', '%s', '%s', '%s', '%s'\n",
rules, model, layout, variant, options);
goto out;
}
}
if (!keymap) {
fprintf(stderr, "Couldn't create xkb keymap\n");
goto out;
}
if (with_compose) {
locale = setlocale(LC_CTYPE, NULL);
compose_table =
xkb_compose_table_new_from_locale(ctx, locale,
XKB_COMPOSE_COMPILE_NO_FLAGS);
if (!compose_table) {
fprintf(stderr, "Couldn't create compose from locale\n");
goto out;
}
}
kbds = get_keyboards(keymap, compose_table);
if (!kbds) {
goto out;
}
#ifdef ENABLE_PRIVATE_APIS
if (print_fields & PRINT_MODMAPS) {
print_keys_modmaps(keymap);
putchar('\n');
print_keymap_modmaps(keymap);
putchar('\n');
}
#endif
act.sa_handler = sigintr_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
tools_disable_stdin_echo();
ret = loop(kbds);
tools_enable_stdin_echo();
free_keyboards(kbds);
out:
xkb_compose_table_unref(compose_table);
xkb_keymap_unref(keymap);
xkb_context_unref(ctx);
return ret;
}
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