Re: Cannot get I/O permissions

April 1, 2011


      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.