Cannot get I/O permissions

2011/4/2 Sengottuvelan S [off-list ref]:

On Fri, Apr 1, 2011 at 3:32 PM, Sengottuvelan S [off-list ref]
wrote:

quoted

Hi All,

I am trying to access /dev/mem in my user process. I could not access

Check the kernel config CONFIG_STRICT_DEVMEM

quoted

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