NetBSD/common/lib/libprop/prop_copyin_ioctl.9

.\"	$NetBSD: prop_copyin_ioctl.9,v 1.4 2008/04/30 13:10:46 martin Exp $
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.\" 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 receiving 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.
.Sh RETURN VALUES
If successful, functions return zero. Otherwise, an error number will be returned to indicate the error.
.Sh ERRORS
.Fn prop_array_copyin_ioctl
and
.Fn prop_dictionary_copyin_ioctl
will fail if:
.Bl -tag -width Er
.It Bq Er EFAULT
Bad address
.It Bq Er EIO
Input/output error
.It Bq Er ENOMEM
Cannot allocate memory
.It Bq Er ENOTSUP
Not supported
.El
.Pp
.Fn prop_array_copyout_ioctl
and
.Fn prop_dictionary_copyout_ioctl
will fail if:
.Bl -tag -width Er
.It Bq Er EFAULT
Bad address
.It Bq Er ENOMEM
Cannot allocate memory
.It Bq Er ENOTSUP
Not supported
.El
.Sh EXAMPLES
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 .