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.\" $NetBSD: prop_copyin_ioctl.9,v 1.16 2025/04/23 02:58:52 thorpej Exp $
.\"
.\" Copyright (c) 2006, 2009, 2025 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Jason R. Thorpe.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd April 20, 2025
.Dt PROP_COPYIN_IOCTL 9
.Os
.Sh NAME
.Nm prop_object_copyin ,
.Nm prop_object_copyin_size ,
.Nm prop_object_copyin_ioctl ,
.Nm prop_object_copyin_ioctl_size ,
.Nm prop_object_copyout ,
.Nm prop_object_copyout_ioctl
.Nd Copy property lists to and from kernel space
.Sh SYNOPSIS
.In prop/proplib.h
.Ft int
.Fn prop_object_copyin "const struct plistref *pref" \
"prop_object_t *arrayp"
.Ft int
.Fn prop_object_copyin_size "const struct plistref *pref" \
"prop_object_t *arrayp" "size_t lim"
.Ft int
.Fn prop_object_copyin_ioctl "const struct plistref *pref" \
"const u_long cmd" "prop_object_t *arrayp"
.Ft int
.Fn prop_object_copyin_ioctl_size "const struct plistref *pref" \
"const u_long cmd" "prop_object_t *arrayp" "size_t lim"
.Ft int
.Fn prop_object_copyout "struct plistref *pref" \
"prop_object_t array"
.Ft int
.Fn prop_object_copyout_ioctl "struct plistref *pref" \
"const u_long cmd" "prop_object_t array"
.Sh DESCRIPTION
The
.Nm prop_object_copyin_ioctl ,
.Nm prop_object_copyin_ioctl_size ,
and
.Nm prop_object_copyout_ioctl
functions implement the kernel side of a protocol for copying property lists
to and from the kernel using
.Xr ioctl 2 .
The functions
.Nm prop_object_copyin ,
.Nm prop_object_copyin_size ,
and
.Nm prop_object_copyout
implement the kernel side of a protocol for copying property lists to the
kernel as arguments of normal system calls.
.Pp
A kernel 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.
.Pp
The functions
.Nm prop_object_copyin_size
and
.Nm prop_object_copyin_ioctl_size
take an explicit size limit argument
.Ar lim
while
.Nm prop_object_copyin
and
.Nm prop_object_copyin_ioctl
have an implicit size limit of 128KB.
Attempts to transfer objects larger than the limit result in an
.Er E2BIG
return value.
.Pp
The functions
.Fn prop_array_copyin ,
.Fn prop_array_copyin_size ,
.Fn prop_array_copyin_ioctl ,
.Fn prop_array_copyin_ioctl_size ,
.Fn prop_dictionary_copyin ,
.Fn prop_dictionary_copyin_size ,
.Fn prop_dictionary_copyin_ioctl ,
and
.Fn prop_dictionary_copyin_ioctl_size
are provided as wrappers around the corresponding generic object
functions.
They are provided for backwards compatibility and will fail if the
object copied in is not of the specified type, preserving the previous
behavior.
.Pp
The functions
.Fn prop_array_copyout ,
.Fn prop_array_copyout_ioctl ,
.Fn prop_dictionary_copyout ,
and
.Fn prop_dictionary_copyout_ioctl
are also provided as backwards compatibility wrappers around the
corresponding generic object functions, but impose no object type
constraints.
.Sh RETURN VALUES
If successful, functions return zero.
Otherwise, an error number will be returned to indicate the error.
.Sh EXAMPLES
The following
.Pq simplified
example demonstrates using
.Fn prop_object_copyin_ioctl
and
.Fn prop_object_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_object_copyin_ioctl(pref, cmd,
(prop_object_t *)\*[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_object_copyout_ioctl(pref, cmd, fooprops);
break;
}
default:
return (EPASSTHROUGH);
}
return (error);
}
.Ed
.Pp
The following
.Pq simplified
example demonstrates using
.Fn prop_object_copyin
in a routine:
.Bd -literal
int
foocopyin(const struct plistref *pref))
{
prop_array_t array;
int error;
error = prop_object_copyin(pref, (prop_object_t *)\*[Am]array);
if (error)
return (error);
...
}
.Ed
.Sh ERRORS
.Fn prop_object_copyin_ioctl
will fail if:
.Bl -tag -width Er
.It Bq Er E2BIG
The object being copied is larger than an arbitrarily established limit
(currently set to 128Kbytes).
.It Bq Er EFAULT
Bad address
.It Bq Er EIO
Input/output error
.It Bq Er ENOMEM
Cannot allocate memory
.El
.Pp
.Fn prop_object_copyout_ioctl
will fail if:
.Bl -tag -width Er
.It Bq Er EFAULT
Bad address
.It Bq Er ENOMEM
Cannot allocate memory
.El
.Sh SEE ALSO
.Xr prop_array 3 ,
.Xr prop_dictionary 3 ,
.Xr prop_object 3 ,
.Xr prop_send_ioctl 3 ,
.Xr prop_send_syscall 3 ,
.Xr proplib 3
.Sh HISTORY
The
.Nm proplib
property container object library first appeared in
.Nx 4.0 .
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