Function rpmsgdev_open

drivers/misc/rpmsgdev.c:200–243

 ****************************************************************************/

static int rpmsgdev_open(FAR struct file *filep)
{
  FAR struct rpmsgdev_s *dev;
  FAR struct rpmsgdev_priv_s *priv;
  struct rpmsgdev_open_s msg;
  int ret;

  /* Get the mountpoint inode reference from the file structure and the
   * mountpoint private data from the inode structure
   */

  dev = filep->f_inode->i_private;
  DEBUGASSERT(dev != NULL);

  priv = kmm_zalloc(sizeof(*priv));
  if (priv == NULL)
    {
      return -ENOMEM;
    }

  /* Try to open the device in the remote cpu, open with O_NONBLOCK
   * by default to avoid the server rptun thread blocked in read/write
   * operations.
   */

  msg.flags = filep->f_oflags | O_NONBLOCK;
  ret = rpmsgdev_send_recv(dev, RPMSGDEV_OPEN, true, &msg.header,
                           sizeof(msg), NULL);
  if (ret < 0)
    {
      rpmsgdeverr("open failed, ret=%d\n", ret);
      kmm_free(priv);
      return ret;
    }

  priv->filep    = msg.filep;
  priv->nonblock = (filep->f_oflags & O_NONBLOCK) != 0;

  /* Attach the private date to the struct file instance */

  filep->f_priv = priv;

  return ret;
}

/****************************************************************************
 * Name: rpmsgdev_close