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

   1 #include <err.h>
   2 #include <fcntl.h>
   3 #include <getopt.h>
   4 #include <linux/input.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <sysexits.h>
   9 #include <unistd.h>
  10
  11 int main (int argc, char **argv)
  12 {
  13   int print_usec = 0;
  14   struct option long_options[] = {
  15     {"usec",   no_argument,       &print_usec,  1   },
  16     {0,        0,                 0,            0   },
  17   };
  18   while (1) {
  19     int c = getopt_long(argc, argv, "", long_options, NULL);
  20     if (c == -1) break;
  21     if (c != 0) exit(EX_USAGE);
  22   }
  23
  24   int fd = open("/dev/input/by-path/platform-i8042-serio-0-event-kbd", O_RDONLY);
  25   if (fd < 0) {
  26     err(EX_NOINPUT, "Could not open keyboard event file");
  27   }
  28   struct input_event i;
  29   while (read(fd, &i, sizeof(i)) == sizeof(i)) {
  30     if (i.type == 1 && i.value == 1) {
  31       if (print_usec) {
  32         printf("%ld.%ld\n", i.time.tv_sec, i.time.tv_usec);
  33       } else {
  34         printf("%ld\n", i.time.tv_sec);
  35       }
  36       fflush(stdout);
  37     }
  38   }
  39   return 0;
  40 }