Print usec timestamps correctly

[keystroke-timestamps] / keystroke-timestamps.c

diff --git a/keystroke-timestamps.c b/keystroke-timestamps.c
index 2ab4c42938a2cb3177bd1f00c1a2f413d8ba712c..693560025031b7a521cde6a196b145e90be07ce3 100644 (file)
--- a/keystroke-timestamps.c
+++ b/keystroke-timestamps.c
@@ -11,25 +11,33 @@
 int main (int argc, char **argv)
 {
   int print_usec = 0;
+  char* device = strdup("/dev/input/by-path/platform-i8042-serio-0-event-kbd");
   struct option long_options[] = {
+    {"device", required_argument, 0,            'd' },
     {"usec",   no_argument,       &print_usec,  1   },
     {0,        0,                 0,            0   },
   };
   while (1) {
     int c = getopt_long(argc, argv, "", long_options, NULL);
     if (c == -1) break;
+    if (c == 'd') {
+      free(device);
+      device = strdup(optarg);
+      continue;
+    }
     if (c != 0) exit(EX_USAGE);
   }
 
-  int fd = open("/dev/input/by-path/platform-i8042-serio-0-event-kbd", O_RDONLY);
+  int fd = open(device, O_RDONLY);
   if (fd < 0) {
     err(EX_NOINPUT, "Could not open keyboard event file");
   }
+  free(device);
   struct input_event i;
   while (read(fd, &i, sizeof(i)) == sizeof(i)) {
     if (i.type == 1 && i.value == 1) {
       if (print_usec) {
-        printf("%ld.%ld\n", i.time.tv_sec, i.time.tv_usec);
+        printf("%ld.%06ld\n", i.time.tv_sec, i.time.tv_usec);
       } else {
         printf("%ld\n", i.time.tv_sec);
       }