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   char* device = strdup("/dev/input/by-path/platform-i8042-serio-0-event-kbd");
  15   struct option long_options[] = {
  16     {"device", required_argument, 0,            'd' },
  17     {"usec",   no_argument,       &print_usec,  1   },
  18     {0,        0,                 0,            0   },
  19   };
  20   while (1) {
  21     int c = getopt_long(argc, argv, "", long_options, NULL);
  22     if (c == -1) break;
  23     if (c == 'd') {
  24       free(device);
  25       device = strdup(optarg);
  26       continue;
  27     }
  28     if (c != 0) exit(EX_USAGE);
  29   }
  30
  31   int fd = open(device, O_RDONLY);
  32   if (fd < 0) {
  33     err(EX_NOINPUT, "Could not open keyboard event file");
  34   }
  35   free(device);
  36   struct input_event i;
  37   while (read(fd, &i, sizeof(i)) == sizeof(i)) {
  38     if (i.type == 1 && i.value == 1) {
  39       if (print_usec) {
  40         printf("%ld.%06ld\n", i.time.tv_sec, i.time.tv_usec);
  41       } else {
  42         printf("%ld\n", i.time.tv_sec);
  43       }
  44       fflush(stdout);
  45     }
  46   }
  47   return 0;
  48 }