From mboxrd@z Thu Jan  1 00:00:00 1970
From: colin@cvidal.org (Colin Vidal)
Date: Sat, 02 Jul 2016 22:34:24 +0200
Subject: convension about type argument on _IO macro
Message-ID: <1467491664.2769691.655169025.43C3335D@webmail.messagingengine.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

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