i386_iopl man page on MirBSD

i386_iopl man page on MirBSD

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I386_IOPL(2)		BSD Programmer's Manual (i386)		  I386_IOPL(2)

NAME
     i386_iopl - change the i386 I/O privilege level

SYNOPSIS
     #include <sys/types.h>
     #include <machine/sysarch.h>

     int
     i386_iopl(int iopl);

DESCRIPTION
     i386_iopl() sets the i386 I/O privilege level to the value specified by
     iopl. This call is restricted to the superuser.

     Note: Code using the i386_iopl() function must be compiled using -li386.

RETURN VALUES
     Upon successful completion, i386_iopl() returns 0. Otherwise, a value of
     -1 is returned and the global variable errno is set to indicate the er-
     ror.

ERRORS
     i386_iopl() will fail if:

     [EPERM]   The caller was not the superuser.

SEE ALSO
     i386_get_ioperm(2), i386_set_ioperm(2)

REFERENCES
     Intel, i386 Microprocessor Programmer's Reference Manual.

WARNING
     You can really hose your machine if you enable user-level I/O and write
     to hardware ports without care.

MirOS BSD #10-current	       October 14, 1995				     1

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