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int iopl(int level);
level: [in] the new io level of the process, in the range [0,3].
Changes the io privilege level of the current task. The task must have superuser privileges to use the call. The task can get total io privileges this way.
On success zero is returned. On error -1 is returned and errno is
set to one of the following values:
EINVAL: level has an invalid value.
EPERM: the calling process is not superuser.
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