import upstream maccel baseline

bench/evdriverlag.c

@@ -0,0 +1,54 @@
+#include <fcntl.h>
+#include <linux/input.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define MOUSE_DEVICE "/dev/input/event2"
+
+static __suseconds_t to_us(struct timeval time) {
+  return time.tv_sec * 1000000L + time.tv_usec;
+}
+
+#define EVENT_TIME_PAIR_CNT 1000 * 2
+
+int main(void) {
+  // Open the source device
+  int fd_source = open(MOUSE_DEVICE, O_RDONLY);
+  if (fd_source < 0) {
+    perror("Failed to open source device");
+    return 1;
+  }
+
+  __suseconds_t times[EVENT_TIME_PAIR_CNT] = {0};
+  int tidx = 0;
+
+  // Main loop to read, modify, and write events
+  struct input_event ev;
+  while (tidx < EVENT_TIME_PAIR_CNT && read(fd_source, &ev, sizeof(ev)) > 0) {
+    struct timeval now;
+    gettimeofday(&now, NULL);
+
+    times[tidx++] = to_us(ev.time);
+    times[tidx++] = to_us(now);
+  }
+
+  // Cleanup
+  close(fd_source);
+
+  tidx = 0;
+
+  printf("event_time,read_time,diff\n"); // eve'ry is in us
+  while (tidx < EVENT_TIME_PAIR_CNT) {
+    __suseconds_t event_time = times[tidx++];
+    __suseconds_t read_time = times[tidx++];
+    /* __suseconds_t diff =  ; */
+
+    /* printf("event time: %luus, read time: %luus\n", event_time, read_time);
+     */
+    /* printf("time diff: %luus\n", read_time - event_time); */
+    printf("%lu,%lu,%lu\n", event_time, read_time, read_time - event_time);
+  }
+
+  return 0;
+}