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I386_GET_IOPERM(2)	  FreeBSD System Calls Manual	    I386_GET_IOPERM(2)

NAME
     i386_get_ioperm, i386_set_ioperm -- manage	per-process access to the i386
     I/O port space

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <machine/sysarch.h>

     int
     i386_get_ioperm(unsigned int start, unsigned int *length, int *enable);

     int
     i386_set_ioperm(unsigned int start, unsigned int length, int enable);

DESCRIPTION
     The i386_get_ioperm() system call will return the permission for the
     process' I/O port space in	the *enable argument.  The port	range starts
     at	start and the number of	contiguous entries will	be returned in
     *length.

     The i386_set_ioperm() system call will set	access to a range of I/O ports
     described by the start and	length arguments to the	state specified	by the
     enable argument.

RETURN VALUES
     Upon successful completion, the value 0 is	returned; otherwise the
     value -1 is returned and the global variable errno	is set to indicate the
     error.

ERRORS
     The i386_get_ioperm() and i386_set_ioperm() system	calls will fail	if:

     [EINVAL]		An invalid range was specified by the start or length
			arguments.

     [EPERM]		The caller of i386_set_ioperm was not the superuser.

SEE ALSO
     io(4)

AUTHORS
     This man page was written by Jonathan Lemon.

FreeBSD	9.3			 July 27, 1998			   FreeBSD 9.3

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | AUTHORS

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