1 files changed, 106 insertions, 0 deletions
diff --git a/src/relabsd_device.c b/src/relabsd_device.c
index b093203..4af52c8 100644
--- a/src/relabsd_device.c
+++ b/src/relabsd_device.c
@@ -205,6 +205,8 @@ int relabsd_device_create
 
    close(fd);
 
+   dev->fd = fd;
+
    return 0;
 }
 
@@ -246,3 +248,107 @@ int relabsd_device_write_evdev_event
 
    return -1;
 }
+
+
+void relabsd_device_set_axes_to_zero
+(
+   const struct relabsd_device * const dev,
+   const struct relabsd_config * const config
+)
+{
+   int i;
+
+   for (i = 0; i < RELABSD_VALID_AXES_COUNT; ++i)
+   {
+      if (config->axis[i].enabled)
+      {
+         relabsd_device_write_evdev_event
+         (
+            dev,
+            relabsd_axis_to_abs((enum relabsd_axis) i),
+            EV_ABS,
+            0
+         );
+      }
+   }
+
+   /*
+    * Also send a SYN event when the axes have been modified.
+    */
+   libevdev_uinput_write_event(dev->uidev, EV_SYN, SYN_REPORT, 0);
+}
+
+int relabsd_device_wait_next_event
+(
+   const struct relabsd_device * const dev,
+   const struct relabsd_config * const config
+)
+{
+   int ready_fds;
+   const int old_errno = errno;
+   fd_set ready_to_read;
+   struct timeval curr_timeout;
+
+   FD_ZERO(&ready_to_read);
+   FD_SET(dev->fd, &ready_to_read);
+
+   /* call to select may alter timeout */
+   memcpy
+   (
+      (void *) &(curr_timeout),
+      (const void *) &(config->timeout),
+      sizeof(struct timeval)
+   );
+
+   errno = 0;
+
+   ready_fds = select
+   (
+      (dev->fd + 1),
+      &ready_to_read,
+      (fd_set *) NULL,
+      (fd_set *) NULL,
+      &(curr_timeout)
+   );
+
+   if (errno != 0)
+   {
+      RELABSD_ERROR
+      (
+         "Unable to wait for timeout: %s (errno: %d).",
+         strerror(errno),
+         errno
+      );
+
+      if (errno == EINTR)
+      {
+         /* Signal interruption? */
+      }
+      else
+      {
+         /* TODO: error message */
+      }
+
+      errno = old_errno;
+
+      return -1;
+   }
+
+   if (ready_fds == -1)
+   {
+      /* TODO: error message */
+
+      RELABSD_S_ERROR
+      (
+         "Unable to wait for timeout, yet errno was not set to anything."
+      );
+
+      errno = old_errno;
+
+      return -1;
+   }
+
+   errno = old_errno;
+
+   return ready_fds;
+}