.\"	$NetBSD: prop_send_syscall.3,v 1.5 2011/09/30 22:08:18 jym Exp $
.\"
.\" Copyright (c) 2006 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 January 17, 2011
.Dt PROP_SEND_SYCALL 3
.Os
.Sh NAME
.Nm prop_array_send_syscall ,
.Nm prop_array_recv_syscall ,
.Nm prop_dictionary_send_syscall ,
.Nm prop_dictionary_recv_syscall
.Nd send and receive property lists to and from the kernel using syscalls
.Sh LIBRARY
.Lb libprop
.Sh SYNOPSIS
.In libprop/proplib.h
.Ft int
.Fn prop_array_send_syscall "prop_array_t array" "struct plistref *prefp"
.Ft int
.Fn prop_array_recv_syscall "const struct plistref *prefp" \
    "prop_array_t *arrayp"
.Ft int
.Fn prop_dictionary_send_syscall "prop_dictionary_t dict" \
    "struct plistref *prefp"
.Ft int
.Fn prop_dictionary_recv_syscall "const struct plistref *prefp" \
    "prop_dictionary_t *dictp"
.Sh DESCRIPTION
The
.Nm prop_array_send_syscall ,
.Nm prop_array_recv_syscall ,
.Nm prop_dictionary_send_syscall ,
and
.Nm prop_dictionary_recv_syscall
functions implement the user space side of a protocol for sending property
lists to and from the kernel using
.Xr syscall 2 .
.Sh RETURN VALUES
If successful, functions return zero.
Otherwise, an error number is returned to indicate the error.
.Sh EXAMPLES
The following
.Pq simplified
example demonstrates using
.Fn prop_dictionary_send_syscall
and
.Fn prop_dictionary_recv_syscall
in an application:
.Bd -literal
void
foo_setprops(prop_dictionary_t dict)
{
    struct pref pref;

    (void) prop_dictionary_send_syscall(dict, \*[Am]pref);
    (void) my_syscall_set(\*[Am]pref);

}

prop_dictionary_t
foo_getprops(void)
{
    prop_dictionary_t dict;
    struct pref pref;

    (void) my_syscall_get(\*[Am]pref);
    if (prop_dictionary_recv_syscall(\*[Am]pref, \*[Am]dict) != 0)
        return (NULL);

    return (dict);
}
.Ed
.Sh ERRORS
.Fn prop_array_send_syscall
and
.Fn prop_dictionary_send_syscall
will fail if:
.Bl -tag -width Er
.It Bq Er ENOMEM
Cannot allocate memory
.It Bq Er ENOTSUP
Not supported
.El
.Pp
.Fn prop_array_recv_syscall
and
.Fn prop_dictionary_recv_syscall
will fail if:
.Bl -tag -width Er
.It Bq Er EIO
Input/output error
.It Bq Er ENOTSUP
Not supported
.El
.Sh SEE ALSO
.Xr prop_array 3 ,
.Xr prop_dictionary 3 ,
.Xr proplib 3 ,
.Xr prop_copyin_ioctl 9
.Sh HISTORY
The
.Nm proplib
property container object library first appeared in
.Nx 4.0 .