Hi all, In LDDv3, chapter 6, on ioctl, macros IOCTQUANTIUM is defined with _IO(SCULL_MAGIC, 3). IOCT_* tells that a value (given directly as value through the argument) is set to the device. However, no type is given to this macro. It is not a big deal since this macro is just a helper to generate identifiers, but, I wonder if there is any convention telling that we should precise an argument only if it's a pointer ? Thanks - Colin