1/*
2 *Copyright (C) 2003-2004 Harold L Hunt II All Rights Reserved.
3 *Copyright (C) Colin Harrison 2005-2008
4 *
5 *Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 *"Software"), to deal in the Software without restriction, including
8 *without limitation the rights to use, copy, modify, merge, publish,
9 *distribute, sublicense, and/or sell copies of the Software, and to
10 *permit persons to whom the Software is furnished to do so, subject to
11 *the following conditions:
12 *
13 *The above copyright notice and this permission notice shall be
14 *included in all copies or substantial portions of the Software.
15 *
16 *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 *EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 *MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 *NONINFRINGEMENT. IN NO EVENT SHALL HAROLD L HUNT II BE LIABLE FOR
20 *ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
21 *CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 *WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 *
24 *Except as contained in this notice, the name of the copyright holder(s)
25 *and author(s) shall not be used in advertising or otherwise to promote
26 *the sale, use or other dealings in this Software without prior written
27 *authorization from the copyright holder(s) and author(s).
28 *
29 * Authors:	Harold L Hunt II
30 *              Colin Harrison
31 */
32
33#ifdef HAVE_XWIN_CONFIG_H
34#include <xwin-config.h>
35#endif
36
37#include "win.h"
38#include "dixstruct.h"
39
40/*
41 * Local function prototypes
42 */
43
44DISPATCH_PROC(winProcEstablishConnection);
45
46/*
47 * Wrapper for internal EstablishConnection function.
48 * Initializes internal clients that must not be started until
49 * an external client has connected.
50 */
51
52int
53winProcEstablishConnection(ClientPtr client)
54{
55    int iReturn;
56    static int s_iCallCount = 0;
57    static unsigned long s_ulServerGeneration = 0;
58
59    if (s_iCallCount == 0)
60        winDebug("winProcEstablishConnection - Hello\n");
61
62    /* Do nothing if clipboard is not enabled */
63    if (!g_fClipboard) {
64        ErrorF("winProcEstablishConnection - Clipboard is not enabled, "
65               "returning.\n");
66
67        /* Unwrap the original function, call it, and return */
68        InitialVector[2] = winProcEstablishConnectionOrig;
69        iReturn = (*winProcEstablishConnectionOrig) (client);
70        winProcEstablishConnectionOrig = NULL;
71        return iReturn;
72    }
73
74    /* Watch for server reset */
75    if (s_ulServerGeneration != serverGeneration) {
76        /* Save new generation number */
77        s_ulServerGeneration = serverGeneration;
78
79        /* Reset call count */
80        s_iCallCount = 0;
81    }
82
83    /* Increment call count */
84    ++s_iCallCount;
85
86    /*
87     * This procedure is only used for initialization.
88     * We can unwrap the original procedure at this point
89     * so that this function is no longer called until the
90     * server resets and the function is wrapped again.
91     */
92    InitialVector[2] = winProcEstablishConnectionOrig;
93
94    /*
95     * Call original function and bail if it fails.
96     * NOTE: We must do this first, since we need XdmcpOpenDisplay
97     * to be called before we initialize our clipboard client.
98     */
99    iReturn = (*winProcEstablishConnectionOrig) (client);
100    if (iReturn != 0) {
101        ErrorF("winProcEstablishConnection - ProcEstablishConnection "
102               "failed, bailing.\n");
103        return iReturn;
104    }
105
106    /* Clear original function pointer */
107    winProcEstablishConnectionOrig = NULL;
108
109    /* Startup the clipboard client if clipboard mode is being used */
110    if (g_fClipboard) {
111        /*
112         * NOTE: The clipboard client is started here for a reason:
113         * 1) Assume you are using XDMCP (e.g. XWin -query %hostname%)
114         * 2) If the clipboard client attaches during X Server startup,
115         *    then it becomes the "magic client" that causes the X Server
116         *    to reset if it exits.
117         * 3) XDMCP calls KillAllClients when it starts up.
118         * 4) The clipboard client is a client, so it is killed.
119         * 5) The clipboard client is the "magic client", so the X Server
120         *    resets itself.
121         * 6) This repeats ad infinitum.
122         * 7) We avoid this by waiting until at least one client (could
123         *    be XDM, could be another client) connects, which makes it
124         *    almost certain that the clipboard client will not connect
125         *    until after XDM when using XDMCP.
126         */
127
128        /* Create the clipboard client thread */
129        if (!winInitClipboard()) {
130            ErrorF("winProcEstablishConnection - winClipboardInit "
131                   "failed.\n");
132            return iReturn;
133        }
134
135        ErrorF("winProcEstablishConnection - winInitClipboard returned.\n");
136    }
137
138    return iReturn;
139}
140