From mboxrd@z Thu Jan  1 00:00:00 1970
From: sengottuvelan.s@gmail.com (Sengottuvelan S)
Date: Fri, 1 Apr 2011 15:32:59 -0700
Subject: Cannot get I/O permissions
In-Reply-To: <BANLkTimVusN58K-aUpkYmshHKh3Hy8Bb6g@mail.gmail.com>
References: <BANLkTimVusN58K-aUpkYmshHKh3Hy8Bb6g@mail.gmail.com>
Message-ID: <BANLkTikL-Tyeanmu2ehCqh+n-p9QJbaVaA@mail.gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

On Fri, Apr 1, 2011 at 3:32 PM, Sengottuvelan S
<sengottuvelan.s@gmail.com>wrote:

> Hi All,
>
> I am trying to access /dev/mem in my user process. I could not access
> because not a privileged access. I tried to use iopl(3) call in linux 2.6,
> but i am getting unresolved symbol for this.  Is any other way to get access
> in user process. I am not sure how to solve this. Can you someone throw some
> light on this.
>
>    if(iopl(3)){
>         fprintf(stderr, "Cannot get I/O permissions (being root helps)");
>         return -1;
>     }
>
>   if ((fd = open("/dev/mem", O_RDWR | O_SYNC)) < 0) {
>         fprintf(stderr, "Failed to open /dev/mem");
>         return -1;
>     }
>
> --
> Regards,
> S. Sengottuvelan.
>



-- 
Regards,
S. Sengottuvelan.
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