156 lines
4.9 KiB
Groff
156 lines
4.9 KiB
Groff
.\" $NetBSD: prop_data.3,v 1.5 2008/01/21 22:15:03 christos Exp $
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.\"
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.\" Copyright (c) 2006 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd April 22, 2006
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.Dt PROP_DATA 3
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.Os
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.Sh NAME
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.Nm prop_data ,
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.Nm prop_data_create_data ,
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.Nm prop_data_create_data_nocopy ,
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.Nm prop_data_copy ,
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.Nm prop_data_size ,
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.Nm prop_data_data ,
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.Nm prop_data_data_nocopy ,
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.Nm prop_data_equals ,
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.Nm prop_data_equals_data
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.Nd opaque data value property object
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.Sh LIBRARY
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.Lb libprop
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.Sh SYNOPSIS
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.In prop/proplib.h
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.\"
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.Ft prop_data_t
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.Fn prop_data_create_data "const void *blob" "size_t len"
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.Ft prop_data_t
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.Fn prop_data_create_data_nocopy "const void *blob" "size_t len"
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.\"
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.Ft prop_data_t
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.Fn prop_data_copy "prop_data_t data"
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.\"
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.Ft void *
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.Fn prop_data_data "prop_data_t data"
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.Ft size_t
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.Fn prop_data_size "prop_data_t data"
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.Ft const void *
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.Fn prop_data_data_nocopy "prop_data_t data"
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.\"
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.Ft bool
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.Fn prop_data_equals "prop_data_t dat1" "prop_data_t dat2"
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.Ft bool
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.Fn prop_data_equals_data "prop_data_t data" "const void *blob" "size_t len"
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.Sh DESCRIPTION
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The
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.Nm prop_data
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family of functions operate on an opaque data value property object type.
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.Bl -tag -width "xxxxx"
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.It Fn prop_data_create_data "const void *blob" "size_t len"
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Create a data object that contains a copy of
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.Fa blob
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with size
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.Fa len .
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Returns
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.Dv NULL
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on failure.
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.It Fn prop_data_create_data_nocopy "const void *blob" "size_t len"
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Create a data object that contains a reference to
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.Fa blob
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with size
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.Fa len .
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Returns
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.Dv NULL
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on failure.
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.It Fn prop_data_copy "prop_data_t data"
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Copy a data object.
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If the data object being copied is an external data reference,
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then the copy also references the same external data.
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Returns
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.Dv NULL
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on failure.
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.It Fn prop_data_size "prop_data_t data"
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Returns the size of the data object.
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If the supplied object isn't a data object, zero is returned.
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.It Fn prop_data_data "prop_data_t data"
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Returns a copy of the data object's contents.
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The caller is responsible for freeing the returned buffer.
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If the supplied object isn't a data object or
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if the data container is empty,
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.Dv NULL
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is returned.
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.Pp
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In user space, the buffer is allocated using
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.Xr malloc 3 .
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In the kernel, the buffer is allocated using
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.Xr malloc 9
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using the malloc type
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.Dv M_TEMP .
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.It Fn prop_data_data_nocopy "prop_data_t data"
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Returns an immutable reference to the contents of the data object.
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If the supplied object isn't a data object,
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.Dv NULL
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is returned.
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.It Fn prop_data_equals "prop_data_t dat1" "prop_data_t dat2"
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Returns
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.Dv true
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if the two data objects are equivalent.
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If at least one of the supplied objects isn't a data object,
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.Dv false
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is returned.
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.It Fn prop_data_equals_data "prop_data_t data" "const void *blob" "size_t len"
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Returns
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.Dv true
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if the data object's value is equivalent to
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.Fa blob
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with size
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.Fa len .
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If the supplied object isn't a data object,
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.Dv false
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is returned.
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.El
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.Sh SEE ALSO
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.Xr prop_array 3 ,
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.Xr prop_bool 3 ,
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.Xr prop_dictionary 3 ,
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.Xr prop_number 3 ,
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.Xr prop_object 3 ,
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.Xr prop_string 3 ,
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.Xr proplib 3
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.Sh HISTORY
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The
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.Nm proplib
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property container object library first appeared in
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.Nx 4.0 .
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