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#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <libevdev/libevdev.h>
void print_usage(FILE *stream, const char *program) {
fprintf(stream,
"intercept - redirect device input events to stdout\n"
"\n"
"usage: %s [-h | [-g] devnode]\n"
"\n"
"options:\n"
" -h show this message and exit\n"
" -g grab device\n"
" devnode path of device to capture events from\n",
program);
}
int main(int argc, char *argv[]) {
int grab = 0;
for (int opt; (opt = getopt(argc, argv, "hg")) != -1;) {
switch (opt) {
case 'h':
return print_usage(stdout, argv[0]), EXIT_SUCCESS;
case 'g':
if (grab)
break;
grab = 1;
continue;
}
return print_usage(stderr, argv[0]), EXIT_FAILURE;
}
if (optind != argc - 1)
return print_usage(stderr, argv[0]), EXIT_FAILURE;
int fd = open(argv[optind], O_RDONLY);
if (fd < 0)
return perror("open failed"), EXIT_FAILURE;
int result = EXIT_FAILURE;
struct libevdev *dev;
if (libevdev_new_from_fd(fd, &dev) < 0)
goto teardown_fd;
if (grab && libevdev_grab(dev, LIBEVDEV_GRAB) < 0)
goto teardown_dev;
setbuf(stdout, NULL);
for (;;) {
struct input_event input;
int rc = libevdev_next_event(
dev, LIBEVDEV_READ_FLAG_NORMAL | LIBEVDEV_READ_FLAG_BLOCKING,
&input);
while (rc == LIBEVDEV_READ_STATUS_SYNC)
rc = libevdev_next_event(dev, LIBEVDEV_READ_FLAG_SYNC, &input);
if (rc == -EAGAIN)
continue;
if (rc != LIBEVDEV_READ_STATUS_SUCCESS)
break;
if (fwrite(&input, sizeof input, 1, stdout) != 1)
goto teardown_grab;
}
result = EXIT_SUCCESS;
teardown_grab:
if (grab)
libevdev_grab(dev, LIBEVDEV_UNGRAB);
teardown_dev:
libevdev_free(dev);
teardown_fd:
close(fd);
return result;
}
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