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

The function returns the value 0 if successful; 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.

BSD July 27, 1998

BSD