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X86_64_IOPL(2) BSD/x86_64 System Calls Manual X86_64_IOPL(2)
x86_64_iopl -- change the x86_64 I/O privilege level
x86_64 Architecture Library (libx86_64, -lx86_64)
x86_64_iopl() sets the x86_64 I/O privilege level to the value specified by iopl. This call
is restricted to the super-user.
Upon successful completion, x86_64_iopl() returns 0. Otherwise, a value of -1 is returned
and the global variable errno is set to indicate the error.
x86_64_iopl() will fail if:
[EPERM] The caller was not the super-user, or the operation was not permitted at the cur-
rent security level.
You can really hose your machine if you enable user-level I/O and write to hardware ports
BSD July 3, 2002 BSD
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