git.scottworley.com Git - keystroke-timestamps/blob - keystroke-timestamps.c

   1 #include <err.h>
   2 #include <fcntl.h>
   3 #include <linux/input.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <sysexits.h>
   7 #include <unistd.h>
   8
   9 int main (int argc, char **argv)
  10 {
  11   int print_usec = argc > 1 && strcmp(argv[1], "--usec") == 0;
  12   int fd = open("/dev/input/by-path/platform-i8042-serio-0-event-kbd", O_RDONLY);
  13   if (fd < 0) {
  14     err(EX_NOINPUT, "Could not open keyboard event file");
  15   }
  16   struct input_event i;
  17   while (read(fd, &i, sizeof(i)) == sizeof(i)) {
  18     if (i.type == 1 && i.value == 1) {
  19       if (print_usec) {
  20         printf("%ld.%ld\n", i.time.tv_sec, i.time.tv_usec);
  21       } else {
  22         printf("%ld\n", i.time.tv_sec);
  23       }
  24       fflush(stdout);
  25     }
  26   }
  27   return 0;
  28 }