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X86_64_IOPL(2) System Calls Manual (x86_64) X86_64_IOPL(2) NAME x86_64_iopl -- change the x86_64 I/O privilege level LIBRARY x86_64 Architecture Library (libx86_64, -lx86_64) SYNOPSIS #include <sys/types.h> #include <machine/sysarch.h> int x86_64_iopl(int iopl); DESCRIPTION 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. RETURN VALUES 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. ERRORS x86_64_iopl() will fail if: [EPERM] The caller was not the super-user, or the operation was not permitted at the current security level. WARNING You can really hose your machine if you enable user-level I/O and write to hardware ports without care. NetBSD 7.1.2 July 3, 2002 NetBSD 7.1.2