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xserver/hw/xwin/winclipboard/thread.c

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/*
*Copyright (C) 2003-2004 Harold L Hunt II All Rights Reserved.
*Copyright (C) Colin Harrison 2005-2008
*
*Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
*"Software"), to deal in the Software without restriction, including
*without limitation the rights to use, copy, modify, merge, publish,
*distribute, sublicense, and/or sell copies of the Software, and to
*permit persons to whom the Software is furnished to do so, subject to
*the following conditions:
*
*The above copyright notice and this permission notice shall be
*included in all copies or substantial portions of the Software.
*
*THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
*EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
*MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
*NONINFRINGEMENT. IN NO EVENT SHALL HAROLD L HUNT II BE LIABLE FOR
*ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
*CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
*WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*Except as contained in this notice, the name of the copyright holder(s)
*and author(s) shall not be used in advertising or otherwise to promote
*the sale, use or other dealings in this Software without prior written
*authorization from the copyright holder(s) and author(s).
*
* Authors: Harold L Hunt II
* Colin Harrison
*/
#ifdef HAVE_XWIN_CONFIG_H
#include <xwin-config.h>
#else
#define HAS_WINSOCK 1
#endif
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
#include <pthread.h>
#include <sys/param.h> // for MAX() macro
#ifdef HAS_WINSOCK
#include <X11/Xwinsock.h>
#else
#include <errno.h>
#endif
#include <xcb/xcb.h>
#include <xcb/xcb_aux.h>
#include <xcb/xcb_icccm.h>
#include <xcb/xfixes.h>
#include "winclipboard.h"
#include "internal.h"
#define WIN_CONNECT_RETRIES 40
#define WIN_CONNECT_DELAY 4
#define WIN_CLIPBOARD_WINDOW_CLASS "xwinclip"
#define WIN_CLIPBOARD_WINDOW_TITLE "xwinclip"
#ifdef HAS_DEVWINDOWS
#define WIN_MSG_QUEUE_FNAME "/dev/windows"
#endif
/*
* Global variables
*/
static HWND g_hwndClipboard = NULL;
int xfixes_event_base;
int xfixes_error_base;
/*
* Local function prototypes
*/
static HWND
winClipboardCreateMessagingWindow(xcb_connection_t *conn, xcb_window_t iWindow, ClipboardAtoms *atoms);
static xcb_atom_t
intern_atom(xcb_connection_t *conn, const char *atomName)
{
xcb_intern_atom_reply_t *atom_reply;
xcb_intern_atom_cookie_t atom_cookie;
xcb_atom_t atom = XCB_ATOM_NONE;
atom_cookie = xcb_intern_atom(conn, 0, strlen(atomName), atomName);
atom_reply = xcb_intern_atom_reply(conn, atom_cookie, NULL);
if (atom_reply) {
atom = atom_reply->atom;
free(atom_reply);
}
return atom;
}
/*
* Create X11 and Win32 messaging windows, and run message processing loop
*
* returns TRUE if shutdown was signalled to loop, FALSE if some error occurred
*/
BOOL
winClipboardProc(char *szDisplay, xcb_auth_info_t *auth_info)
{
ClipboardAtoms atoms;
int iReturn;
HWND hwnd = NULL;
int iConnectionNumber = 0;
#ifdef HAS_DEVWINDOWS
int fdMessageQueue = 0;
#else
struct timeval tvTimeout;
#endif
fd_set fdsRead;
int iMaxDescriptor;
xcb_connection_t *conn;
xcb_window_t iWindow = XCB_NONE;
int iSelectError;
BOOL fShutdown = FALSE;
ClipboardConversionData data;
int screen;
winDebug("winClipboardProc - Hello\n");
/* Make sure that the display opened */
conn = xcb_connect_to_display_with_auth_info(szDisplay, auth_info, &screen);
if (xcb_connection_has_error(conn)) {
ErrorF("winClipboardProc - Failed opening the display, giving up\n");
goto winClipboardProc_Done;
}
ErrorF("winClipboardProc - xcb_connect () returned and "
"successfully opened the display.\n");
/* Get our connection number */
iConnectionNumber = xcb_get_file_descriptor(conn);
#ifdef HAS_DEVWINDOWS
/* Open a file descriptor for the windows message queue */
fdMessageQueue = open(WIN_MSG_QUEUE_FNAME, O_RDONLY);
if (fdMessageQueue == -1) {
ErrorF("winClipboardProc - Failed opening %s\n", WIN_MSG_QUEUE_FNAME);
goto winClipboardProc_Done;
}
/* Find max of our file descriptors */
iMaxDescriptor = MAX(fdMessageQueue, iConnectionNumber) + 1;
#else
iMaxDescriptor = iConnectionNumber + 1;
#endif
const xcb_query_extension_reply_t *xfixes_query;
xfixes_query = xcb_get_extension_data(conn, &xcb_xfixes_id);
if (!xfixes_query->present)
ErrorF ("winClipboardProc - XFixes extension not present\n");
xfixes_event_base = xfixes_query->first_event;
xfixes_error_base = xfixes_query->first_error;
/* Must advise server of XFIXES version we require */
xcb_xfixes_query_version_unchecked(conn, 1, 0);
/* Create atoms */
atoms.atomClipboard = intern_atom(conn, "CLIPBOARD");
atoms.atomLocalProperty = intern_atom(conn, "CYGX_CUT_BUFFER");
atoms.atomUTF8String = intern_atom(conn, "UTF8_STRING");
atoms.atomCompoundText = intern_atom(conn, "COMPOUND_TEXT");
atoms.atomTargets = intern_atom(conn, "TARGETS");
atoms.atomIncr = intern_atom(conn, "INCR");
xcb_screen_t *root_screen = xcb_aux_get_screen(conn, screen);
xcb_window_t root_window_id = root_screen->root;
/* Create a messaging window */
iWindow = xcb_generate_id(conn);
xcb_void_cookie_t cookie = xcb_create_window_checked(conn,
XCB_COPY_FROM_PARENT,
iWindow,
root_window_id,
1, 1,
500, 500,
0,
XCB_WINDOW_CLASS_INPUT_ONLY,
XCB_COPY_FROM_PARENT,
0,
NULL);
xcb_generic_error_t *error;
if ((error = xcb_request_check(conn, cookie))) {
ErrorF("winClipboardProc - Could not create an X window.\n");
free(error);
goto winClipboardProc_Done;
}
xcb_icccm_set_wm_name(conn, iWindow, XCB_ATOM_STRING, 8, strlen("xwinclip"), "xwinclip");
/* Select event types to watch */
const static uint32_t values[] = { XCB_EVENT_MASK_PROPERTY_CHANGE };
cookie = xcb_change_window_attributes_checked(conn, iWindow, XCB_CW_EVENT_MASK, values);
if ((error = xcb_request_check(conn, cookie))) {
ErrorF("winClipboardProc - Could not set event mask on messaging window\n");
free(error);
}
xcb_xfixes_select_selection_input(conn,
iWindow,
XCB_ATOM_PRIMARY,
XCB_XFIXES_SELECTION_EVENT_MASK_SET_SELECTION_OWNER |
XCB_XFIXES_SELECTION_EVENT_MASK_SELECTION_WINDOW_DESTROY |
XCB_XFIXES_SELECTION_EVENT_MASK_SELECTION_CLIENT_CLOSE);
xcb_xfixes_select_selection_input(conn,
iWindow,
atoms.atomClipboard,
XCB_XFIXES_SELECTION_EVENT_MASK_SET_SELECTION_OWNER |
XCB_XFIXES_SELECTION_EVENT_MASK_SELECTION_WINDOW_DESTROY |
XCB_XFIXES_SELECTION_EVENT_MASK_SELECTION_CLIENT_CLOSE);
/* Initialize monitored selection state */
winClipboardInitMonitoredSelections();
/* Create Windows messaging window */
hwnd = winClipboardCreateMessagingWindow(conn, iWindow, &atoms);
/* Save copy of HWND */
g_hwndClipboard = hwnd;
/* Assert ownership of selections if Win32 clipboard is owned */
if (NULL != GetClipboardOwner()) {
/* PRIMARY */
cookie = xcb_set_selection_owner_checked(conn, iWindow, XCB_ATOM_PRIMARY, XCB_CURRENT_TIME);
if ((error = xcb_request_check(conn, cookie))) {
ErrorF("winClipboardProc - Could not set PRIMARY owner\n");
free(error);
goto winClipboardProc_Done;
}
/* CLIPBOARD */
cookie = xcb_set_selection_owner_checked(conn, iWindow, atoms.atomClipboard, XCB_CURRENT_TIME);
if ((error = xcb_request_check(conn, cookie))) {
ErrorF("winClipboardProc - Could not set CLIPBOARD owner\n");
free(error);
goto winClipboardProc_Done;
}
}
data.incr = NULL;
data.incrsize = 0;
/* Loop for events */
while (1) {
/* Process X events */
winClipboardFlushXEvents(hwnd, iWindow, conn, &data, &atoms);
/* Process Windows messages */
if (!winClipboardFlushWindowsMessageQueue(hwnd)) {
ErrorF("winClipboardProc - winClipboardFlushWindowsMessageQueue trapped "
"WM_QUIT message, exiting main loop.\n");
break;
}
/* We need to ensure that all pending requests are sent */
xcb_flush(conn);
/* Setup the file descriptor set */
/*
* NOTE: You have to do this before every call to select
* because select modifies the mask to indicate
* which descriptors are ready.
*/
FD_ZERO(&fdsRead);
FD_SET(iConnectionNumber, &fdsRead);
#ifdef HAS_DEVWINDOWS
FD_SET(fdMessageQueue, &fdsRead);
#else
tvTimeout.tv_sec = 0;
tvTimeout.tv_usec = 100;
#endif
/* Wait for a Windows event or an X event */
iReturn = select(iMaxDescriptor, /* Highest fds number */
&fdsRead, /* Read mask */
NULL, /* No write mask */
NULL, /* No exception mask */
#ifdef HAS_DEVWINDOWS
NULL /* No timeout */
#else
&tvTimeout /* Set timeout */
#endif
);
#ifndef HAS_WINSOCK
iSelectError = errno;
#else
iSelectError = WSAGetLastError();
#endif
if (iReturn < 0) {
#ifndef HAS_WINSOCK
if (iSelectError == EINTR)
#else
if (iSelectError == WSAEINTR)
#endif
continue;
ErrorF("winClipboardProc - Call to select () failed: %d. "
"Bailing.\n", iReturn);
break;
}
if (FD_ISSET(iConnectionNumber, &fdsRead)) {
winDebug
("winClipboardProc - X connection ready, pumping X event queue\n");
}
#ifdef HAS_DEVWINDOWS
/* Check for Windows event ready */
if (FD_ISSET(fdMessageQueue, &fdsRead))
#else
if (1)
#endif
{
winDebug
("winClipboardProc - /dev/windows ready, pumping Windows message queue\n");
}
#ifdef HAS_DEVWINDOWS
if (!(FD_ISSET(iConnectionNumber, &fdsRead)) &&
!(FD_ISSET(fdMessageQueue, &fdsRead))) {
winDebug("winClipboardProc - Spurious wake, select() returned %d\n", iReturn);
}
#endif
}
/* broke out of while loop on a shutdown message */
fShutdown = TRUE;
winClipboardProc_Done:
/* Close our Windows window */
if (g_hwndClipboard) {
DestroyWindow(g_hwndClipboard);
}
/* Close our X window */
if (!xcb_connection_has_error(conn) && iWindow) {
cookie = xcb_destroy_window_checked(conn, iWindow);
if ((error = xcb_request_check(conn, cookie)))
ErrorF("winClipboardProc - XDestroyWindow failed.\n");
else
ErrorF("winClipboardProc - XDestroyWindow succeeded.\n");
free(error);
}
#ifdef HAS_DEVWINDOWS
/* Close our Win32 message handle */
if (fdMessageQueue)
close(fdMessageQueue);
#endif
/*
* xcb_disconnect() does not sync, so is safe to call even when we are built
* into the server. Unlike XCloseDisplay() there will be no deadlock if the
* server is in the process of exiting and waiting for this thread to exit.
*/
if (!xcb_connection_has_error(conn)) {
/* Close our X display */
xcb_disconnect(conn);
}
/* global clipboard variable reset */
g_hwndClipboard = NULL;
return fShutdown;
}
/*
* Create the Windows window that we use to receive Windows messages
*/
static HWND
winClipboardCreateMessagingWindow(xcb_connection_t *conn, xcb_window_t iWindow, ClipboardAtoms *atoms)
{
WNDCLASSEX wc;
ClipboardWindowCreationParams cwcp;
HWND hwnd;
/* Setup our window class */
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = winClipboardWindowProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = GetModuleHandle(NULL);
wc.hIcon = 0;
wc.hCursor = 0;
wc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = WIN_CLIPBOARD_WINDOW_CLASS;
wc.hIconSm = 0;
RegisterClassEx(&wc);
/* Information to be passed to WM_CREATE */
cwcp.pClipboardDisplay = conn;
cwcp.iClipboardWindow = iWindow;
cwcp.atoms = atoms;
/* Create the window */
hwnd = CreateWindowExA(0, /* Extended styles */
WIN_CLIPBOARD_WINDOW_CLASS, /* Class name */
WIN_CLIPBOARD_WINDOW_TITLE, /* Window name */
WS_OVERLAPPED, /* Not visible anyway */
CW_USEDEFAULT, /* Horizontal position */
CW_USEDEFAULT, /* Vertical position */
CW_USEDEFAULT, /* Right edge */
CW_USEDEFAULT, /* Bottom edge */
(HWND) NULL, /* No parent or owner window */
(HMENU) NULL, /* No menu */
GetModuleHandle(NULL), /* Instance handle */
&cwcp); /* Creation data */
assert(hwnd != NULL);
/* I'm not sure, but we may need to call this to start message processing */
ShowWindow(hwnd, SW_HIDE);
/* Similarly, we may need a call to this even though we don't paint */
UpdateWindow(hwnd);
return hwnd;
}
void
winClipboardWindowDestroy(void)
{
if (g_hwndClipboard) {
SendMessage(g_hwndClipboard, WM_WM_QUIT, 0, 0);
}
}
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