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int ioperm(unsigned long from, unsigned long num, int
turn_on);
from: [in] begining of the range of ports to modify.
num: [in] number of ports to modify.
turn_on: [in] new permission value of the new ports.
Modify the permission bits of a range of ports for the current task. The task must have superuser privileges to use the call. The range of ports that can be modified is limited to [0,3FFh].
On success zero is returned. On error -1 is returned and errno is
set to a value reflecting the kind of error.
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