6cf1ffe998
plist-based messages and to eliminate looping previously required to receive a plist from the kernel: - prop_dictionary_copyin_ioctl() and prop_dictionary_copyout_ioctl() now take the cmd argument rather than the file open flag. The read-ness or write-ness of an ioctl command is checked by these routines to ensure that information is being passed to/from the userland component properly. - prop_dictionary_copyout_ioctl() now allocates the memory for the XML plist on behalf of the userland component by way of uvm_mmap(). The XML plist is copied out to the newly-mapped anonymous region, and the pointer returned via the plistref. - prop_dictionary_recv_ioctl() is responsible for munmap()'ing the region after parsing the XML plist into internal represenatation. - A new prop_dictionary_sendrecv_ioctl() is added, allowing user space code to send a dictionary to the kernel and receive one back as a reply. Update users of prop_kern for the API changes (Bluetooth). This constitutes an ABI / protocol change -- but this will also be put into NetBSD 4.0 so that the first proplib release will implement the new scheme.
116 lines
3.8 KiB
Groff
116 lines
3.8 KiB
Groff
.\" $NetBSD: prop_dictionary_copyin_ioctl.9,v 1.4 2006/09/22 04:20:23 thorpej 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 September 13, 2006
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.Dt PROP_DICTIONARY_COPYIN_IOCTL 9
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.Os
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.Sh NAME
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.Nm prop_dictionary_copyin_ioctl ,
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.Nm prop_dictionary_copyout_ioctl
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.Nd Copy property lists to and from kernel space
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.Sh SYNOPSIS
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.In prop/proplib.h
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.Ft int
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.Fn prop_dictionary_copyin_ioctl "const struct plistref *pref" \
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"const u_long cmd" "prop_dictionary_t *dictp"
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.Ft int
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.Fn prop_dictionary_copyout_ioctl "struct plistref *pref" \
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"const u_long cmd" "prop_dictionary_t dict"
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.Sh DESCRIPTION
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The
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.Nm prop_dictionary_copyin_ioctl
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and
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.Nm prop_dictionary_copyout_ioctl
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functions implement the kernel side of a protocol for sending property lists
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to and from the kernel using
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.Xr ioctl 2 .
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.Pp
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A kernel ioctl routine receivig or returning a property list will be passed a
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pointer to a
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.Vt struct plistref .
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This structure encapsulates the reference to the property list in externalized
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form.
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.Pp
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The following
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.Pq simplified
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example demonstrates using
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.Fn prop_dictionary_copyin_ioctl
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and
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.Fn prop_dictionary_copyout_ioctl
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in an ioctl routine:
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.Bd -literal
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extern prop_dictionary_t fooprops;
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int
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fooioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l)
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{
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prop_dictionary_t dict, odict;
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int error;
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switch (cmd) {
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case FOOSETPROPS: {
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const struct plistref *pref = (const struct plistref *) data;
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error = prop_dictionary_copyin_ioctl(pref, cmd, \*[Am]dict);
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if (error)
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return (error);
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odict = fooprops;
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fooprops = dict;
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prop_object_release(odict);
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break;
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}
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case FOOGETPROPS: {
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struct plistref *pref = (struct plistref *) data;
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error = prop_dictionary_copyout_ioctl(pref, cmd, fooprops);
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break;
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}
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default:
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return (EPASSTHROUGH);
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}
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return (error);
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}
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.Ed
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.Sh SEE ALSO
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.Xr prop_dictionary 3 ,
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.Xr prop_dictionary_send_ioctl 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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