ea51e9b287
Clients that use plugin systems may require multiple calls to
XIQueryVersion from different plugins. The current error handling requires
client-side synchronisation of version numbers.
The first call to XIQueryVersion defines the server behaviour. Once cached,
always return that version number to any clients. Unless a client requests a
version lower than the first defined one, then a BadValue must be returned
to be protocol-compatible.
Introduced in 2c23ef83b0
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Jeremy Huddleston <jeremyhu@apple.com>
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/*
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* Copyright © 2009 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors: Peter Hutterer
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*
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*/
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/**
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* @file xiqueryversion.c
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* Protocol handling for the XIQueryVersion request/reply.
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include "inputstr.h"
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#include <X11/Xmd.h>
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#include <X11/X.h>
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#include <X11/extensions/XI2proto.h>
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#include "exglobals.h"
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#include "exevents.h"
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#include "xiqueryversion.h"
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#include "misc.h"
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extern XExtensionVersion XIVersion; /* defined in getvers.c */
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/**
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* Return the supported XI version.
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*
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* Saves the version the client claims to support as well, for future
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* reference.
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*/
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int
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ProcXIQueryVersion(ClientPtr client)
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{
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xXIQueryVersionReply rep;
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XIClientPtr pXIClient;
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int major, minor;
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REQUEST(xXIQueryVersionReq);
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REQUEST_SIZE_MATCH(xXIQueryVersionReq);
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/* This request only exists after XI2 */
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if (stuff->major_version < 2) {
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client->errorValue = stuff->major_version;
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return BadValue;
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}
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pXIClient = dixLookupPrivate(&client->devPrivates, XIClientPrivateKey);
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if (pXIClient->major_version) {
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if (version_compare(stuff->major_version, stuff->minor_version,
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pXIClient->major_version, pXIClient->minor_version) < 0) {
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client->errorValue = stuff->major_version;
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return BadValue;
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}
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major = pXIClient->major_version;
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minor = pXIClient->minor_version;
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} else {
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if (version_compare(XIVersion.major_version, XIVersion.minor_version,
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stuff->major_version, stuff->minor_version) > 0) {
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major = stuff->major_version;
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minor = stuff->minor_version;
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}
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else {
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major = XIVersion.major_version;
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minor = XIVersion.minor_version;
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}
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pXIClient->major_version = major;
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pXIClient->minor_version = minor;
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}
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memset(&rep, 0, sizeof(xXIQueryVersionReply));
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rep.repType = X_Reply;
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rep.RepType = X_XIQueryVersion;
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rep.length = 0;
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rep.sequenceNumber = client->sequence;
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rep.major_version = major;
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rep.minor_version = minor;
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WriteReplyToClient(client, sizeof(xXIQueryVersionReply), &rep);
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return Success;
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}
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/* Swapping routines */
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int
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SProcXIQueryVersion(ClientPtr client)
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{
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REQUEST(xXIQueryVersionReq);
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swaps(&stuff->length);
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REQUEST_AT_LEAST_SIZE(xXIQueryVersionReq);
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swaps(&stuff->major_version);
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swaps(&stuff->minor_version);
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return (ProcXIQueryVersion(client));
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}
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void
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SRepXIQueryVersion(ClientPtr client, int size, xXIQueryVersionReply * rep)
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{
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swaps(&rep->sequenceNumber);
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swapl(&rep->length);
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swaps(&rep->major_version);
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swaps(&rep->minor_version);
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WriteToClient(client, size, (char *) rep);
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}
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