From mboxrd@z Thu Jan  1 00:00:00 1970
From: telent997@gmail.com (Pei Lin)
Date: Wed, 6 Apr 2011 11:30:32 +0800
Subject: Cannot get I/O permissions
In-Reply-To: <BANLkTikL-Tyeanmu2ehCqh+n-p9QJbaVaA@mail.gmail.com>
References: <BANLkTimVusN58K-aUpkYmshHKh3Hy8Bb6g@mail.gmail.com>
	<BANLkTikL-Tyeanmu2ehCqh+n-p9QJbaVaA@mail.gmail.com>
Message-ID: <BANLkTins5L7BNcULtsJfAdnijR7Npc+3Vw@mail.gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

2011/4/2 Sengottuvelan S <sengottuvelan.s@gmail.com>:
>
> 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
Check the kernel config CONFIG_STRICT_DEVMEM
>> 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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>



-- 
Best Regards
Lin