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.

Debian                                            July 27, 1998                               I386_GET_IOPERM(2)