I386_IOPL(2)            NetBSD/i386 System Calls Manual           I386_IOPL(2)

NAME
     i386_iopl -- change the i386 I/O privilege level

LIBRARY
     i386 Architecture Library (libi386, -li386)

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 super-user.

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
     error.

ERRORS
     i386_iopl() will fail if:

     [EPERM]   The caller was not the super-user, or the operation was not
               permitted at the current security level.

REFERENCES
     i386 Microprocessor Programmer's Reference Manual, Intel

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

NetBSD 7.0                      April 12, 2004                      NetBSD 7.0

You can also request any man page by name and (optionally) by section:

Command: 
Section: 
Architecture: 
Collection: 
 

Use the DEFAULT collection to view manual pages for third-party software.


©1994 Man-cgi 1.15, Panagiotis Christias <christia@softlab.ntua.gr>
©1996-2014 Modified for NetBSD by Kimmo Suominen