07-30-2013
I don't think it was ever "open" despite the name. You'd have to check with HP to see if it's possible to gain access to it.
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curses.h,v $ $Revision: 4.2.7.3 $ (DEC) $Date: 1994/05/12 18:03:48 $
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IO(4) BSD Kernel Interfaces Manual IO(4)
NAME
io -- I/O privilege file
SYNOPSIS
device io
#include <sys/types.h>
#include <sys/ioctl.h>
#include <dev/io/iodev.h>
#include <machine/iodev.h>
struct iodev_pio_req {
u_int access;
u_int port;
u_int width;
u_int val;
};
DESCRIPTION
The special file /dev/io is a controlled security hole that allows a process to gain I/O privileges (which are normally reserved for kernel-
internal code). This can be useful in order to write userland programs that handle some hardware directly.
The usual operations on the device are to open it via the open(2) interface and to send I/O requests to the file descriptor using the
ioctl(2) syscall.
The ioctl(2) requests available for /dev/io are mostly platform dependent, but there are also some in common between all of them. The
IODEV_PIO is used by all the architectures in order to request that an I/O operation be performed. It takes a 'struct iodev_pio_req' argu-
ment that must be previously setup.
The access member specifies the type of operation requested. It may be:
IODEV_PIO_READ The operation is an "in" type. A value will be read from the specified port (retrieved from the port member) and the result
will be stored in the val member.
IODEV_PIO_WRITE The operation is a "out" type. The value will be fetched from the val member and will be written out to the specified port
(defined as the port member).
Finally, the width member specifies the size of the operand to be read/written, expressed in bytes.
In addition to any file access permissions on /dev/io, the kernel enforces that only the super-user may open this device.
LEGACY
The /dev/io interface used to be very i386 specific and worked differently. The initial implementation simply raised the IOPL of the current
thread when open(2) was called on the device. This behaviour is retained in the current implementation as legacy support for both i386 and
amd64 architectures.
SEE ALSO
close(2), i386_get_ioperm(2), i386_set_ioperm(2), ioctl(2), open(2), mem(4)
HISTORY
The io file appeared in FreeBSD 1.0.
BSD
June 1, 2010 BSD