From mboxrd@z Thu Jan  1 00:00:00 1970
From: daniel.redway85@gmail.com (Daniel Redway)
Date: Sat, 18 Jun 2011 18:39:45 +0300
Subject: some defines I couldnt understand '_IOC_NONE 1U'
Message-ID: <BANLkTi=nqxai1W1sbwRsYDNHdLWv_0R7mg@mail.gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hello

I dont understand what means 'U' character. I found this defines in
asm/ioctl.h file.
Thanks

#define _IOC_NONE 1U
#define _IOC_READ 2U
#define _IOC_WRITE 4U
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