704f23576a
iskey tells you if any of a given list of keys are pressed on any input device in the system. e.g. $ iskey KEY_VOLUMEDOWN Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-3.0-or-later
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#include <dirent.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <libevdev/libevdev.h>
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#define MAX_KEYS 32
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static int codes[MAX_KEYS] = { 0 };
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static unsigned int types[MAX_KEYS] = { 0 };
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static int debug = 0;
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static int print_key = 0;
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#define log(fmt, ...) \
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do { \
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if (debug) \
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fprintf(stderr, fmt, ##__VA_ARGS__); \
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} while (0)
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#define INPUT_DIR "/dev/input/"
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int usage(const char *name)
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{
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fprintf(stderr, "Usage: %s [-d] [-s] key1...\n", name);
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fprintf(stderr, " -d: debug mode\n");
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fprintf(stderr, " -s: print the name of the key\n");
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fprintf(stderr, "\n");
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fprintf(stderr, " Check if any input device has the specified keys pressed\n"
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" and exit with code 0 if so, otherwise exit with code 1\n");
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return 1;
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}
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/* Check if any of the input devices have a non-zero value for any of the keys.
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* if so then return 0, otherwise return -1.
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*/
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int check_for_keys(struct libevdev *dev)
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{
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int i;
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for (i = 0; i < MAX_KEYS; i++) {
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if (codes[i] == 0)
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break;
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if (!libevdev_has_event_code(dev, types[i], codes[i]))
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continue;
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if (libevdev_get_event_value(dev, types[i], codes[i])) {
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if (print_key)
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printf("%s\n", libevdev_event_code_get_name(types[i], codes[i]));
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return 0;
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}
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}
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return -1;
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}
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int main(int argc, char *argv[])
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{
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struct libevdev *dev;
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struct dirent *dir;
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DIR *d;
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int i = 0, opt, fd;
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char path[64] = { 0 };
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/* getopt */
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while ((opt = getopt(argc, argv, "d")) != -1) {
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switch (opt) {
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case 'd':
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debug = 1;
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break;
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case 's':
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print_key = 1;
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break;
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default:
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return usage(argv[0]);
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}
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}
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for (; optind < argc && i < MAX_KEYS; optind++) {
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codes[i] = libevdev_event_code_from_code_name(argv[optind]);
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if (codes[i] == -1) {
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fprintf(stderr, "Unknown key %s\n", argv[optind]);
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return 1;
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}
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types[i++] = libevdev_event_type_from_code_name(argv[optind]);
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log("Checking for %s %s (%d)\n", libevdev_event_type_get_name(types[i-1]), argv[optind], codes[i-1]);
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}
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d = opendir(INPUT_DIR);
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if (!d) {
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perror("couldn't open /dev/input/");
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return 1;
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}
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/* Walk through the entries in /dev/input */
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while ((dir = readdir(d)) != NULL) {
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memset(path, 0, sizeof(path));
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i = snprintf(path, sizeof(path), "%s%s", INPUT_DIR, dir->d_name);
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if (i < 0 || i >= sizeof(path)) {
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printf("Path '%s' too long\n", dir->d_name);
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return 1;
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}
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if (dir->d_type != DT_CHR || strncmp("event", dir->d_name, 5) != 0)
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continue;
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fd = open(path, O_RDONLY|O_NONBLOCK);
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if (fd < 0) {
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log("couldn't open device %s\n", dir->d_name);
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continue;
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}
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fd = libevdev_new_from_fd(fd, &dev);
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if (fd < 0) {
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log("couldn't init libevdev for %s: %s\n", dir->d_name, strerror(-fd));
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continue;
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}
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log("Checking device %s\n", libevdev_get_name(dev));
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if (!check_for_keys(dev)) {
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close(fd);
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return 0;
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}
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close(fd);
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}
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closedir(d);
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return 1;
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}
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