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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <linux/input.h>
void usage(const char *progname) {
fprintf(stderr, "Usage: %s /dev/input/eventX\n", progname);
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[]) {
int fd;
struct input_event ev;
ssize_t n;
if (argc != 2) {
usage(argv[0]);
}
// Open the evdev device provided in the command line argument
fd = open(argv[1], O_RDONLY);
if (fd < 0) {
perror("Error opening device");
exit(EXIT_FAILURE);
}
printf("Listening for events on %s. Press Ctrl+C to exit.\n", argv[1]);
// Event reading loop
while (1) {
n = read(fd, &ev, sizeof(ev));
if (n == (ssize_t)-1) {
if (errno == EINTR) {printf("EINTR\n");
continue;}
perror("Error reading event");
break;
} else if (n != sizeof(ev)) {
fprintf(stderr, "Short read: %zd\n", n);
break;
}
// Print the event information
printf("Event: time %ld.%06ld, type %d, code %d, value %d\n",
ev.time.tv_sec, ev.time.tv_usec, ev.type, ev.code, ev.value);
}
close(fd);
return 0;
}
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