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I386_IOPL(2) BSD/i386 System Calls Manual I386_IOPL(2)
i386_iopl -- change the i386 I/O privilege level
i386 Architecture Library (libi386, -li386)
i386_iopl() sets the i386 I/O privilege level to the value specified by iopl. This call is
restricted to the super-user.
Upon successful completion, i386_iopl() returns 0. Otherwise, a value of -1 is returned and
the global variable errno is set to indicate the error.
i386_iopl() will fail if:
[EPERM] The caller was not the super-user, or the operation was not permitted at the cur-
rent security level.
i386 Microprocessor Programmer's Reference Manual, Intel
You can really hose your machine if you enable user-level I/O and write to hardware ports
BSD April 12, 2004 BSD
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