.\"	$NetBSD: prop_copyin_ioctl.9,v 1.2 2007/04/22 11:23:29 yamt Exp $
.\"
.\" Copyright (c) 2006 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Jason R. Thorpe.
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.Dd October 25, 2006
.Dt PROP_COPYIN_IOCTL 9
.Os
.Sh NAME
.Nm prop_array_copyin_ioctl ,
.Nm prop_array_copyout_ioctl ,
.Nm prop_dictionary_copyin_ioctl ,
.Nm prop_dictionary_copyout_ioctl
.Nd Copy property lists to and from kernel space
.Sh SYNOPSIS
.In prop/proplib.h
.Ft int
.Fn prop_array_copyin_ioctl "const struct plistref *pref" \
    "const u_long cmd" "prop_array_t *arrayp"
.Ft int
.Fn prop_array_copyout_ioctl "struct plistref *pref" \
    "const u_long cmd" "prop_array_t array"
.Ft int
.Fn prop_dictionary_copyin_ioctl "const struct plistref *pref" \
    "const u_long cmd" "prop_dictionary_t *dictp"
.Ft int
.Fn prop_dictionary_copyout_ioctl "struct plistref *pref" \
    "const u_long cmd" "prop_dictionary_t dict"
.Sh DESCRIPTION
The
.Nm prop_array_copyin_ioctl ,
.Nm prop_array_copyout_ioctl ,
.Nm prop_dictionary_copyin_ioctl ,
and
.Nm prop_dictionary_copyout_ioctl
functions implement the kernel side of a protocol for sending property lists
to and from the kernel using
.Xr ioctl 2 .
.Pp
A kernel ioctl routine receivig or returning a property list will be passed a
pointer to a
.Vt struct plistref .
This structure encapsulates the reference to the property list in externalized
form.
.Pp
The following
.Pq simplified
example demonstrates using
.Fn prop_dictionary_copyin_ioctl
and
.Fn prop_dictionary_copyout_ioctl
in an ioctl routine:
.Bd -literal
extern prop_dictionary_t fooprops;

int
fooioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l)
{
    prop_dictionary_t dict, odict;
    int error;

    switch (cmd) {
    case FOOSETPROPS: {
	const struct plistref *pref = (const struct plistref *) data;
	error = prop_dictionary_copyin_ioctl(pref, cmd, \*[Am]dict);
	if (error)
		return (error);
	odict = fooprops;
	fooprops = dict;
	prop_object_release(odict);
	break;
      }

    case FOOGETPROPS: {
	struct plistref *pref = (struct plistref *) data;
	error = prop_dictionary_copyout_ioctl(pref, cmd, fooprops);
	break;
      }

    default:
	return (EPASSTHROUGH);
    }
    return (error);
}
.Ed
.Sh SEE ALSO
.Xr prop_array 3 ,
.Xr prop_dictionary 3 ,
.Xr prop_send_ioctl 3 ,
.Xr proplib 3
.Sh HISTORY
The
.Nm proplib
property container object library first appeared in
.Nx 4.0 .