xselect.c 71 KB
Newer Older
1
/* X Selection processing for Emacs.
Richard M. Stallman's avatar
Richard M. Stallman committed
2
   Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation.
Richard M. Stallman's avatar
Richard M. Stallman committed
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
18 19
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
20

Jim Blandy's avatar
Jim Blandy committed
21

Richard M. Stallman's avatar
Richard M. Stallman committed
22 23
/* Rewritten by jwz */

24
#include <config.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
25 26
#include "lisp.h"
#include "xterm.h"	/* for all of the X includes */
27 28
#include "dispextern.h"	/* frame.h seems to want this */
#include "frame.h"	/* Need this to get the X window of selected_frame */
29
#include "blockinput.h"
Kenichi Handa's avatar
Kenichi Handa committed
30
#include "buffer.h"
Karl Heuer's avatar
Karl Heuer committed
31 32
#include "charset.h"
#include "coding.h"
Andreas Schwab's avatar
Andreas Schwab committed
33
#include "process.h"
34

Richard M. Stallman's avatar
Richard M. Stallman committed
35 36 37 38 39 40
#define CUT_BUFFER_SUPPORT

Lisp_Object QPRIMARY, QSECONDARY, QSTRING, QINTEGER, QCLIPBOARD, QTIMESTAMP,
  QTEXT, QDELETE, QMULTIPLE, QINCR, QEMACS_TMP, QTARGETS, QATOM, QNULL,
  QATOM_PAIR;

Karl Heuer's avatar
Karl Heuer committed
41 42
Lisp_Object QCOMPOUND_TEXT;	/* This is a type of selection.  */

Richard M. Stallman's avatar
Richard M. Stallman committed
43 44 45 46 47
#ifdef CUT_BUFFER_SUPPORT
Lisp_Object QCUT_BUFFER0, QCUT_BUFFER1, QCUT_BUFFER2, QCUT_BUFFER3,
  QCUT_BUFFER4, QCUT_BUFFER5, QCUT_BUFFER6, QCUT_BUFFER7;
#endif

48 49
static Lisp_Object Vx_lost_selection_hooks;
static Lisp_Object Vx_sent_selection_hooks;
50 51 52
/* Coding system for communicating with other X clients via cutbuffer,
   selection, and clipboard.  */
static Lisp_Object Vclipboard_coding_system;
Richard M. Stallman's avatar
Richard M. Stallman committed
53 54 55 56 57 58

/* If this is a smaller number than the max-request-size of the display,
   emacs will use INCR selection transfer when the selection is larger
   than this.  The max-request-size is usually around 64k, so if you want
   emacs to use incremental selection transfers when the selection is 
   smaller than that, set this.  I added this mostly for debugging the
59
   incremental transfer stuff, but it might improve server performance.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
60 61
#define MAX_SELECTION_QUANTUM 0xFFFFFF

62 63 64 65 66
#ifdef HAVE_X11R4
#define SELECTION_QUANTUM(dpy) ((XMaxRequestSize(dpy) << 2) - 100)
#else
#define SELECTION_QUANTUM(dpy) (((dpy)->max_request_size << 2) - 100)
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
67

68
/* The timestamp of the last input event Emacs received from the X server.  */
69 70
/* Defined in keyboard.c.  */
extern unsigned long last_event_timestamp;
Richard M. Stallman's avatar
Richard M. Stallman committed
71 72

/* This is an association list whose elements are of the form
73 74 75
     ( SELECTION-NAME SELECTION-VALUE SELECTION-TIMESTAMP FRAME)
   SELECTION-NAME is a lisp symbol, whose name is the name of an X Atom.
   SELECTION-VALUE is the value that emacs owns for that selection.
Richard M. Stallman's avatar
Richard M. Stallman committed
76
     It may be any kind of Lisp object.
77
   SELECTION-TIMESTAMP is the time at which emacs began owning this selection,
Richard M. Stallman's avatar
Richard M. Stallman committed
78
     as a cons of two 16-bit numbers (making a 32 bit time.)
79 80
   FRAME is the frame for which we made the selection.
   If there is an entry in this alist, then it can be assumed that Emacs owns
Richard M. Stallman's avatar
Richard M. Stallman committed
81 82
    that selection.
   The only (eq) parts of this list that are visible from Lisp are the
83 84
    selection-values.  */
static Lisp_Object Vselection_alist;
Richard M. Stallman's avatar
Richard M. Stallman committed
85 86 87 88 89

/* This is an alist whose CARs are selection-types (whose names are the same
   as the names of X Atoms) and whose CDRs are the names of Lisp functions to
   call to convert the given Emacs selection value to a string representing 
   the given selection type.  This is for Lisp-level extension of the emacs
90 91
   selection handling.  */
static Lisp_Object Vselection_converter_alist;
Richard M. Stallman's avatar
Richard M. Stallman committed
92 93

/* If the selection owner takes too long to reply to a selection request,
94 95
   we give up on it.  This is in milliseconds (0 = no timeout.)  */
static int x_selection_timeout;
Richard M. Stallman's avatar
Richard M. Stallman committed
96 97 98 99 100 101 102 103 104 105 106

/* Utility functions */

static void lisp_data_to_selection_data ();
static Lisp_Object selection_data_to_lisp_data ();
static Lisp_Object x_get_window_property_as_lisp_data ();

/* This converts a Lisp symbol to a server Atom, avoiding a server 
   roundtrip whenever possible.  */

static Atom
107 108
symbol_to_x_atom (dpyinfo, display, sym)
     struct x_display_info *dpyinfo;
Richard M. Stallman's avatar
Richard M. Stallman committed
109 110 111 112 113 114 115 116 117 118
     Display *display;
     Lisp_Object sym;
{
  Atom val;
  if (NILP (sym))	    return 0;
  if (EQ (sym, QPRIMARY))   return XA_PRIMARY;
  if (EQ (sym, QSECONDARY)) return XA_SECONDARY;
  if (EQ (sym, QSTRING))    return XA_STRING;
  if (EQ (sym, QINTEGER))   return XA_INTEGER;
  if (EQ (sym, QATOM))	    return XA_ATOM;
119 120 121
  if (EQ (sym, QCLIPBOARD)) return dpyinfo->Xatom_CLIPBOARD;
  if (EQ (sym, QTIMESTAMP)) return dpyinfo->Xatom_TIMESTAMP;
  if (EQ (sym, QTEXT))	    return dpyinfo->Xatom_TEXT;
Karl Heuer's avatar
Karl Heuer committed
122
  if (EQ (sym, QCOMPOUND_TEXT)) return dpyinfo->Xatom_COMPOUND_TEXT;
123 124 125 126 127 128
  if (EQ (sym, QDELETE))    return dpyinfo->Xatom_DELETE;
  if (EQ (sym, QMULTIPLE))  return dpyinfo->Xatom_MULTIPLE;
  if (EQ (sym, QINCR))	    return dpyinfo->Xatom_INCR;
  if (EQ (sym, QEMACS_TMP)) return dpyinfo->Xatom_EMACS_TMP;
  if (EQ (sym, QTARGETS))   return dpyinfo->Xatom_TARGETS;
  if (EQ (sym, QNULL))	    return dpyinfo->Xatom_NULL;
Richard M. Stallman's avatar
Richard M. Stallman committed
129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154
#ifdef CUT_BUFFER_SUPPORT
  if (EQ (sym, QCUT_BUFFER0)) return XA_CUT_BUFFER0;
  if (EQ (sym, QCUT_BUFFER1)) return XA_CUT_BUFFER1;
  if (EQ (sym, QCUT_BUFFER2)) return XA_CUT_BUFFER2;
  if (EQ (sym, QCUT_BUFFER3)) return XA_CUT_BUFFER3;
  if (EQ (sym, QCUT_BUFFER4)) return XA_CUT_BUFFER4;
  if (EQ (sym, QCUT_BUFFER5)) return XA_CUT_BUFFER5;
  if (EQ (sym, QCUT_BUFFER6)) return XA_CUT_BUFFER6;
  if (EQ (sym, QCUT_BUFFER7)) return XA_CUT_BUFFER7;
#endif
  if (!SYMBOLP (sym)) abort ();

#if 0
  fprintf (stderr, " XInternAtom %s\n", (char *) XSYMBOL (sym)->name->data);
#endif
  BLOCK_INPUT;
  val = XInternAtom (display, (char *) XSYMBOL (sym)->name->data, False);
  UNBLOCK_INPUT;
  return val;
}


/* This converts a server Atom to a Lisp symbol, avoiding server roundtrips
   and calls to intern whenever possible.  */

static Lisp_Object
155 156
x_atom_to_symbol (dpyinfo, display, atom)
     struct x_display_info *dpyinfo;
Richard M. Stallman's avatar
Richard M. Stallman committed
157 158 159 160 161 162
     Display *display;
     Atom atom;
{
  char *str;
  Lisp_Object val;
  if (! atom) return Qnil;
163 164 165 166 167 168 169 170 171 172 173 174
  switch (atom)
    {
    case XA_PRIMARY:
      return QPRIMARY;
    case XA_SECONDARY:
      return QSECONDARY;
    case XA_STRING:
      return QSTRING;
    case XA_INTEGER:
      return QINTEGER;
    case XA_ATOM:
      return QATOM;
Richard M. Stallman's avatar
Richard M. Stallman committed
175
#ifdef CUT_BUFFER_SUPPORT
176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
    case XA_CUT_BUFFER0:
      return QCUT_BUFFER0;
    case XA_CUT_BUFFER1:
      return QCUT_BUFFER1;
    case XA_CUT_BUFFER2:
      return QCUT_BUFFER2;
    case XA_CUT_BUFFER3:
      return QCUT_BUFFER3;
    case XA_CUT_BUFFER4:
      return QCUT_BUFFER4;
    case XA_CUT_BUFFER5:
      return QCUT_BUFFER5;
    case XA_CUT_BUFFER6:
      return QCUT_BUFFER6;
    case XA_CUT_BUFFER7:
      return QCUT_BUFFER7;
Richard M. Stallman's avatar
Richard M. Stallman committed
192
#endif
193 194
    }

195
  if (atom == dpyinfo->Xatom_CLIPBOARD)
196
    return QCLIPBOARD;
197
  if (atom == dpyinfo->Xatom_TIMESTAMP)
198
    return QTIMESTAMP;
199
  if (atom == dpyinfo->Xatom_TEXT)
200
    return QTEXT;
Karl Heuer's avatar
Karl Heuer committed
201 202
  if (atom == dpyinfo->Xatom_COMPOUND_TEXT)
    return QCOMPOUND_TEXT;
203
  if (atom == dpyinfo->Xatom_DELETE)
204
    return QDELETE;
205
  if (atom == dpyinfo->Xatom_MULTIPLE)
206
    return QMULTIPLE;
207
  if (atom == dpyinfo->Xatom_INCR)
208
    return QINCR;
209
  if (atom == dpyinfo->Xatom_EMACS_TMP)
210
    return QEMACS_TMP;
211
  if (atom == dpyinfo->Xatom_TARGETS)
212
    return QTARGETS;
213
  if (atom == dpyinfo->Xatom_NULL)
214
    return QNULL;
Richard M. Stallman's avatar
Richard M. Stallman committed
215 216 217 218 219 220 221 222 223 224

  BLOCK_INPUT;
  str = XGetAtomName (display, atom);
  UNBLOCK_INPUT;
#if 0
  fprintf (stderr, " XGetAtomName --> %s\n", str);
#endif
  if (! str) return Qnil;
  val = intern (str);
  BLOCK_INPUT;
225
  /* This was allocated by Xlib, so use XFree.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
226 227 228 229
  XFree (str);
  UNBLOCK_INPUT;
  return val;
}
230

Richard M. Stallman's avatar
Richard M. Stallman committed
231 232 233 234 235 236 237 238 239
/* Do protocol to assert ourself as a selection owner.
   Update the Vselection_alist so that we can reply to later requests for 
   our selection.  */

static void
x_own_selection (selection_name, selection_value)
     Lisp_Object selection_name, selection_value;
{
  Window selecting_window = FRAME_X_WINDOW (selected_frame);
240
  Display *display = FRAME_X_DISPLAY (selected_frame);
241
  Time time = last_event_timestamp;
Richard M. Stallman's avatar
Richard M. Stallman committed
242
  Atom selection_atom;
243
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (selected_frame);
244
  int count;
Richard M. Stallman's avatar
Richard M. Stallman committed
245 246

  CHECK_SYMBOL (selection_name, 0);
247
  selection_atom = symbol_to_x_atom (dpyinfo, display, selection_name);
Richard M. Stallman's avatar
Richard M. Stallman committed
248 249

  BLOCK_INPUT;
250
  count = x_catch_errors (display);
Richard M. Stallman's avatar
Richard M. Stallman committed
251
  XSetSelectionOwner (display, selection_atom, selecting_window, time);
252
  x_check_errors (display, "Can't set selection: %s");
253
  x_uncatch_errors (display, count);
Richard M. Stallman's avatar
Richard M. Stallman committed
254 255 256 257 258 259 260 261 262 263 264
  UNBLOCK_INPUT;

  /* Now update the local cache */
  {
    Lisp_Object selection_time;
    Lisp_Object selection_data;
    Lisp_Object prev_value;

    selection_time = long_to_cons ((unsigned long) time);
    selection_data = Fcons (selection_name,
			    Fcons (selection_value,
265 266
				   Fcons (selection_time,
					  Fcons (Fselected_frame (), Qnil))));
Richard M. Stallman's avatar
Richard M. Stallman committed
267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290
    prev_value = assq_no_quit (selection_name, Vselection_alist);

    Vselection_alist = Fcons (selection_data, Vselection_alist);

    /* If we already owned the selection, remove the old selection data.
       Perhaps we should destructively modify it instead.
       Don't use Fdelq as that may QUIT.  */
    if (!NILP (prev_value))
      {
	Lisp_Object rest;	/* we know it's not the CAR, so it's easy.  */
	for (rest = Vselection_alist; !NILP (rest); rest = Fcdr (rest))
	  if (EQ (prev_value, Fcar (XCONS (rest)->cdr)))
	    {
	      XCONS (rest)->cdr = Fcdr (XCONS (rest)->cdr);
	      break;
	    }
      }
  }
}

/* Given a selection-name and desired type, look up our local copy of
   the selection value and convert it to the type.
   The value is nil or a string.
   This function is used both for remote requests
291
   and for local x-get-selection-internal.
Richard M. Stallman's avatar
Richard M. Stallman committed
292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327

   This calls random Lisp code, and may signal or gc.  */

static Lisp_Object
x_get_local_selection (selection_symbol, target_type)
     Lisp_Object selection_symbol, target_type;
{
  Lisp_Object local_value;
  Lisp_Object handler_fn, value, type, check;
  int count;

  local_value = assq_no_quit (selection_symbol, Vselection_alist);

  if (NILP (local_value)) return Qnil;

  /* TIMESTAMP and MULTIPLE are special cases 'cause that's easiest.  */
  if (EQ (target_type, QTIMESTAMP))
    {
      handler_fn = Qnil;
      value = XCONS (XCONS (XCONS (local_value)->cdr)->cdr)->car;
    }
#if 0
  else if (EQ (target_type, QDELETE))
    {
      handler_fn = Qnil;
      Fx_disown_selection_internal
	(selection_symbol,
	 XCONS (XCONS (XCONS (local_value)->cdr)->cdr)->car);
      value = QNULL;
    }
#endif

#if 0 /* #### MULTIPLE doesn't work yet */
  else if (CONSP (target_type)
	   && XCONS (target_type)->car == QMULTIPLE)
    {
328 329
      Lisp_Object pairs;
      int size;
Richard M. Stallman's avatar
Richard M. Stallman committed
330
      int i;
331 332
      pairs = XCONS (target_type)->cdr;
      size = XVECTOR (pairs)->size;
Richard M. Stallman's avatar
Richard M. Stallman committed
333 334 335 336 337 338 339
      /* If the target is MULTIPLE, then target_type looks like
	  (MULTIPLE . [[SELECTION1 TARGET1] [SELECTION2 TARGET2] ... ])
	 We modify the second element of each pair in the vector and
	 return it as [[SELECTION1 <value1>] [SELECTION2 <value2>] ... ]
       */
      for (i = 0; i < size; i++)
	{
340 341
	  Lisp_Object pair;
	  pair = XVECTOR (pairs)->contents [i];
Richard M. Stallman's avatar
Richard M. Stallman committed
342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358
	  XVECTOR (pair)->contents [1]
	    = x_get_local_selection (XVECTOR (pair)->contents [0],
				     XVECTOR (pair)->contents [1]);
	}
      return pairs;
    }
#endif
  else
    {
      /* Don't allow a quit within the converter.
	 When the user types C-g, he would be surprised
	 if by luck it came during a converter.  */
      count = specpdl_ptr - specpdl;
      specbind (Qinhibit_quit, Qt);

      CHECK_SYMBOL (target_type, 0);
      handler_fn = Fcdr (Fassq (target_type, Vselection_converter_alist));
359 360 361 362 363 364
      if (!NILP (handler_fn))
	value = call3 (handler_fn,
		       selection_symbol, target_type,
		       XCONS (XCONS (local_value)->cdr)->car);
      else
	value = Qnil;
Richard M. Stallman's avatar
Richard M. Stallman committed
365 366 367 368 369
      unbind_to (count, Qnil);
    }

  /* Make sure this value is of a type that we could transmit
     to another X client.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
370

Richard M. Stallman's avatar
Richard M. Stallman committed
371 372 373 374 375 376 377 378 379
  check = value;
  if (CONSP (value)
      && SYMBOLP (XCONS (value)->car))
    type = XCONS (value)->car,
    check = XCONS (value)->cdr;
  
  if (STRINGP (check)
      || VECTORP (check)
      || SYMBOLP (check)
380
      || INTEGERP (check)
Richard M. Stallman's avatar
Richard M. Stallman committed
381 382
      || NILP (value))
    return value;
Richard M. Stallman's avatar
Richard M. Stallman committed
383
  /* Check for a value that cons_to_long could handle.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
384
  else if (CONSP (check)
385 386
	   && INTEGERP (XCONS (check)->car)
	   && (INTEGERP (XCONS (check)->cdr)
Richard M. Stallman's avatar
Richard M. Stallman committed
387 388
	       ||
	       (CONSP (XCONS (check)->cdr)
389
		&& INTEGERP (XCONS (XCONS (check)->cdr)->car)
Richard M. Stallman's avatar
Richard M. Stallman committed
390 391 392 393 394
		&& NILP (XCONS (XCONS (check)->cdr)->cdr))))
    return value;
  else
    return
      Fsignal (Qerror,
Richard M. Stallman's avatar
Richard M. Stallman committed
395
	       Fcons (build_string ("invalid data returned by selection-conversion function"),
Richard M. Stallman's avatar
Richard M. Stallman committed
396 397 398 399 400
		      Fcons (handler_fn, Fcons (value, Qnil))));
}

/* Subroutines of x_reply_selection_request.  */

401
/* Send a SelectionNotify event to the requestor with property=None,
Richard M. Stallman's avatar
Richard M. Stallman committed
402 403 404 405 406 407 408 409 410
   meaning we were unable to do what they wanted.  */

static void
x_decline_selection_request (event)
     struct input_event *event;
{
  XSelectionEvent reply;
  reply.type = SelectionNotify;
  reply.display = SELECTION_EVENT_DISPLAY (event);
411
  reply.requestor = SELECTION_EVENT_REQUESTOR (event);
Richard M. Stallman's avatar
Richard M. Stallman committed
412 413 414 415 416 417
  reply.selection = SELECTION_EVENT_SELECTION (event);
  reply.time = SELECTION_EVENT_TIME (event);
  reply.target = SELECTION_EVENT_TARGET (event);
  reply.property = None;

  BLOCK_INPUT;
418
  XSendEvent (reply.display, reply.requestor, False, 0L,
419
	      (XEvent *) &reply);
420
  XFlush (reply.display);
Richard M. Stallman's avatar
Richard M. Stallman committed
421 422 423 424 425 426 427 428
  UNBLOCK_INPUT;
}

/* This is the selection request currently being processed.
   It is set to zero when the request is fully processed.  */
static struct input_event *x_selection_current_request;

/* Used as an unwind-protect clause so that, if a selection-converter signals
429
   an error, we tell the requester that we were unable to do what they wanted
Richard M. Stallman's avatar
Richard M. Stallman committed
430 431 432 433 434 435 436 437 438 439 440
   before we throw to top-level or go into the debugger or whatever.  */

static Lisp_Object
x_selection_request_lisp_error (ignore)
     Lisp_Object ignore;
{
  if (x_selection_current_request != 0)
    x_decline_selection_request (x_selection_current_request);
  return Qnil;
}

441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470

/* This stuff is so that INCR selections are reentrant (that is, so we can
   be servicing multiple INCR selection requests simultaneously.)  I haven't
   actually tested that yet.  */

/* Keep a list of the property changes that are awaited.  */

struct prop_location
{
  int identifier;
  Display *display;
  Window window;
  Atom property;
  int desired_state;
  int arrived;
  struct prop_location *next;
};

static struct prop_location *expect_property_change ();
static void wait_for_property_change ();
static void unexpect_property_change ();
static int waiting_for_other_props_on_window ();

static int prop_location_identifier;

static Lisp_Object property_change_reply;

static struct prop_location *property_change_reply_object;

static struct prop_location *property_change_wait_list;
471 472 473 474 475 476 477 478 479

static Lisp_Object
queue_selection_requests_unwind (frame)
     Lisp_Object frame;
{
  FRAME_PTR f = XFRAME (frame);

  if (! NILP (frame))
    x_stop_queuing_selection_requests (FRAME_X_DISPLAY (f));
480
  return Qnil;
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499
}

/* Return some frame whose display info is DPYINFO.
   Return nil if there is none.  */

static Lisp_Object
some_frame_on_display (dpyinfo)
     struct x_display_info *dpyinfo;
{
  Lisp_Object list, frame;

  FOR_EACH_FRAME (list, frame)
    {
      if (FRAME_X_DISPLAY_INFO (XFRAME (frame)) == dpyinfo)
	return frame;
    }

  return Qnil;
}
500

Richard M. Stallman's avatar
Richard M. Stallman committed
501 502 503 504 505 506 507 508 509 510 511 512 513 514
/* Send the reply to a selection request event EVENT.
   TYPE is the type of selection data requested.
   DATA and SIZE describe the data to send, already converted.
   FORMAT is the unit-size (in bits) of the data to be transmitted.  */

static void
x_reply_selection_request (event, format, data, size, type)
     struct input_event *event;
     int format, size;
     unsigned char *data;
     Atom type;
{
  XSelectionEvent reply;
  Display *display = SELECTION_EVENT_DISPLAY (event);
515
  Window window = SELECTION_EVENT_REQUESTOR (event);
Richard M. Stallman's avatar
Richard M. Stallman committed
516 517 518
  int bytes_remaining;
  int format_bytes = format/8;
  int max_bytes = SELECTION_QUANTUM (display);
519
  struct x_display_info *dpyinfo = x_display_info_for_display (display);
520
  int count;
Richard M. Stallman's avatar
Richard M. Stallman committed
521 522 523 524 525 526

  if (max_bytes > MAX_SELECTION_QUANTUM)
    max_bytes = MAX_SELECTION_QUANTUM;

  reply.type = SelectionNotify;
  reply.display = display;
527
  reply.requestor = window;
Richard M. Stallman's avatar
Richard M. Stallman committed
528 529 530 531 532 533 534 535
  reply.selection = SELECTION_EVENT_SELECTION (event);
  reply.time = SELECTION_EVENT_TIME (event);
  reply.target = SELECTION_EVENT_TARGET (event);
  reply.property = SELECTION_EVENT_PROPERTY (event);
  if (reply.property == None)
    reply.property = reply.target;

  /* #### XChangeProperty can generate BadAlloc, and we must handle it! */
536
  BLOCK_INPUT;
537
  count = x_catch_errors (display);
Richard M. Stallman's avatar
Richard M. Stallman committed
538 539 540 541 542 543 544 545 546 547 548 549 550 551

  /* Store the data on the requested property.
     If the selection is large, only store the first N bytes of it.
   */
  bytes_remaining = size * format_bytes;
  if (bytes_remaining <= max_bytes)
    {
      /* Send all the data at once, with minimal handshaking.  */
#if 0
      fprintf (stderr,"\nStoring all %d\n", bytes_remaining);
#endif
      XChangeProperty (display, window, reply.property, type, format,
		       PropModeReplace, data, size);
      /* At this point, the selection was successfully stored; ack it.  */
552
      XSendEvent (display, window, False, 0L, (XEvent *) &reply);
Richard M. Stallman's avatar
Richard M. Stallman committed
553 554 555 556
    }
  else
    {
      /* Send an INCR selection.  */
557
      struct prop_location *wait_object;
558
      int had_errors;
559
      Lisp_Object frame;
Richard M. Stallman's avatar
Richard M. Stallman committed
560

561 562 563 564 565 566 567 568 569 570 571 572
      frame = some_frame_on_display (dpyinfo);

      /* If the display no longer has frames, we can't expect
	 to get many more selection requests from it, so don't
	 bother trying to queue them.  */
      if (!NILP (frame))
	{
	  x_start_queuing_selection_requests (display);

	  record_unwind_protect (queue_selection_requests_unwind,
				 frame);
	}
573

574
      if (x_window_to_frame (dpyinfo, window)) /* #### debug */
575
	error ("Attempt to transfer an INCR to ourself!");
Richard M. Stallman's avatar
Richard M. Stallman committed
576 577 578
#if 0
      fprintf (stderr, "\nINCR %d\n", bytes_remaining);
#endif
579 580
      wait_object = expect_property_change (display, window, reply.property,
					    PropertyDelete);
Richard M. Stallman's avatar
Richard M. Stallman committed
581

582
      XChangeProperty (display, window, reply.property, dpyinfo->Xatom_INCR,
583 584
		       32, PropModeReplace,
		       (unsigned char *) &bytes_remaining, 1);
Richard M. Stallman's avatar
Richard M. Stallman committed
585 586
      XSelectInput (display, window, PropertyChangeMask);
      /* Tell 'em the INCR data is there...  */
587
      XSendEvent (display, window, False, 0L, (XEvent *) &reply);
588
      XFlush (display);
589 590

      had_errors = x_had_errors_p (display);
591
      UNBLOCK_INPUT;
Richard M. Stallman's avatar
Richard M. Stallman committed
592

593
      /* First, wait for the requester to ack by deleting the property.
Richard M. Stallman's avatar
Richard M. Stallman committed
594
	 This can run random lisp code (process handlers) or signal.  */
595 596
      if (! had_errors)
	wait_for_property_change (wait_object);
Richard M. Stallman's avatar
Richard M. Stallman committed
597 598 599 600 601 602

      while (bytes_remaining)
	{
	  int i = ((bytes_remaining < max_bytes)
		   ? bytes_remaining
		   : max_bytes);
603 604 605

	  BLOCK_INPUT;

606 607 608
	  wait_object
	    = expect_property_change (display, window, reply.property,
				      PropertyDelete);
Richard M. Stallman's avatar
Richard M. Stallman committed
609 610 611 612 613 614 615 616
#if 0
	  fprintf (stderr,"  INCR adding %d\n", i);
#endif
	  /* Append the next chunk of data to the property.  */
	  XChangeProperty (display, window, reply.property, type, format,
			   PropModeAppend, data, i / format_bytes);
	  bytes_remaining -= i;
	  data += i;
617
	  XFlush (display);
618
	  had_errors = x_had_errors_p (display);
619
	  UNBLOCK_INPUT;
Richard M. Stallman's avatar
Richard M. Stallman committed
620

621 622 623
	  if (had_errors)
	    break;

624
	  /* Now wait for the requester to ack this chunk by deleting the
Richard M. Stallman's avatar
Richard M. Stallman committed
625 626
	     property.	 This can run random lisp code or signal.
	   */
627
	  wait_for_property_change (wait_object);
Richard M. Stallman's avatar
Richard M. Stallman committed
628
	}
629
      /* Now write a zero-length chunk to the property to tell the requester
Richard M. Stallman's avatar
Richard M. Stallman committed
630 631 632 633
	 that we're done.  */
#if 0
      fprintf (stderr,"  INCR done\n");
#endif
634
      BLOCK_INPUT;
Richard M. Stallman's avatar
Richard M. Stallman committed
635 636 637 638 639 640
      if (! waiting_for_other_props_on_window (display, window))
	XSelectInput (display, window, 0L);

      XChangeProperty (display, window, reply.property, type, format,
		       PropModeReplace, data, 0);
    }
641 642

  XFlush (display);
643
  x_uncatch_errors (display, count);
644
  UNBLOCK_INPUT;
Richard M. Stallman's avatar
Richard M. Stallman committed
645 646 647 648 649 650 651 652 653 654
}

/* Handle a SelectionRequest event EVENT.
   This is called from keyboard.c when such an event is found in the queue.  */

void
x_handle_selection_request (event)
     struct input_event *event;
{
  struct gcpro gcpro1, gcpro2, gcpro3;
655
  Lisp_Object local_selection_data;
Richard M. Stallman's avatar
Richard M. Stallman committed
656
  Lisp_Object selection_symbol;
657 658
  Lisp_Object target_symbol;
  Lisp_Object converted_selection;
Richard M. Stallman's avatar
Richard M. Stallman committed
659
  Time local_selection_time;
660
  Lisp_Object successful_p;
Richard M. Stallman's avatar
Richard M. Stallman committed
661
  int count;
662 663
  struct x_display_info *dpyinfo
    = x_display_info_for_display (SELECTION_EVENT_DISPLAY (event));
Richard M. Stallman's avatar
Richard M. Stallman committed
664

665 666 667 668 669
  local_selection_data = Qnil;
  target_symbol = Qnil;
  converted_selection = Qnil;
  successful_p = Qnil;

Richard M. Stallman's avatar
Richard M. Stallman committed
670 671
  GCPRO3 (local_selection_data, converted_selection, target_symbol);

672 673
  selection_symbol = x_atom_to_symbol (dpyinfo,
				       SELECTION_EVENT_DISPLAY (event),
Richard M. Stallman's avatar
Richard M. Stallman committed
674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689
				       SELECTION_EVENT_SELECTION (event));

  local_selection_data = assq_no_quit (selection_symbol, Vselection_alist);

  if (NILP (local_selection_data))
    {
      /* Someone asked for the selection, but we don't have it any more.
       */
      x_decline_selection_request (event);
      goto DONE;
    }

  local_selection_time = (Time)
    cons_to_long (XCONS (XCONS (XCONS (local_selection_data)->cdr)->cdr)->car);

  if (SELECTION_EVENT_TIME (event) != CurrentTime
690
      && local_selection_time > SELECTION_EVENT_TIME (event))
Richard M. Stallman's avatar
Richard M. Stallman committed
691 692 693 694 695 696 697 698 699 700 701 702
    {
      /* Someone asked for the selection, and we have one, but not the one
	 they're looking for.
       */
      x_decline_selection_request (event);
      goto DONE;
    }

  count = specpdl_ptr - specpdl;
  x_selection_current_request = event;
  record_unwind_protect (x_selection_request_lisp_error, Qnil);

703
  target_symbol = x_atom_to_symbol (dpyinfo, SELECTION_EVENT_DISPLAY (event),
Richard M. Stallman's avatar
Richard M. Stallman committed
704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721
				    SELECTION_EVENT_TARGET (event));

#if 0 /* #### MULTIPLE doesn't work yet */
  if (EQ (target_symbol, QMULTIPLE))
    target_symbol = fetch_multiple_target (event);
#endif
  
  /* Convert lisp objects back into binary data */
  
  converted_selection
    = x_get_local_selection (selection_symbol, target_symbol);
  
  if (! NILP (converted_selection))
    {
      unsigned char *data;
      unsigned int size;
      int format;
      Atom type;
722 723
      int nofree;

724 725
      lisp_data_to_selection_data (SELECTION_EVENT_DISPLAY (event),
				   converted_selection,
726
				   &data, &type, &size, &format, &nofree);
Richard M. Stallman's avatar
Richard M. Stallman committed
727 728 729 730 731
      
      x_reply_selection_request (event, format, data, size, type);
      successful_p = Qt;

      /* Indicate we have successfully processed this event.  */
732
      x_selection_current_request = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
733

734
      /* Use xfree, not XFree, because lisp_data_to_selection_data
735
	 calls xmalloc itself.  */
736
      if (!nofree)
737
	xfree (data);
Richard M. Stallman's avatar
Richard M. Stallman committed
738 739 740 741 742 743 744 745 746
    }
  unbind_to (count, Qnil);

 DONE:

  UNGCPRO;

  /* Let random lisp code notice that the selection has been asked for.  */
  {
747 748
    Lisp_Object rest;
    rest = Vx_sent_selection_hooks;
Richard M. Stallman's avatar
Richard M. Stallman committed
749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768
    if (!EQ (rest, Qunbound))
      for (; CONSP (rest); rest = Fcdr (rest))
	call3 (Fcar (rest), selection_symbol, target_symbol, successful_p);
  }
}

/* Handle a SelectionClear event EVENT, which indicates that some other
   client cleared out our previously asserted selection.
   This is called from keyboard.c when such an event is found in the queue.  */

void
x_handle_selection_clear (event)
     struct input_event *event;
{
  Display *display = SELECTION_EVENT_DISPLAY (event);
  Atom selection = SELECTION_EVENT_SELECTION (event);
  Time changed_owner_time = SELECTION_EVENT_TIME (event);
  
  Lisp_Object selection_symbol, local_selection_data;
  Time local_selection_time;
769
  struct x_display_info *dpyinfo = x_display_info_for_display (display);
Richard M. Stallman's avatar
Richard M. Stallman committed
770

771
  selection_symbol = x_atom_to_symbol (dpyinfo, display, selection);
Richard M. Stallman's avatar
Richard M. Stallman committed
772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807

  local_selection_data = assq_no_quit (selection_symbol, Vselection_alist);

  /* Well, we already believe that we don't own it, so that's just fine.  */
  if (NILP (local_selection_data)) return;

  local_selection_time = (Time)
    cons_to_long (XCONS (XCONS (XCONS (local_selection_data)->cdr)->cdr)->car);

  /* This SelectionClear is for a selection that we no longer own, so we can
     disregard it.  (That is, we have reasserted the selection since this
     request was generated.)  */

  if (changed_owner_time != CurrentTime
      && local_selection_time > changed_owner_time)
    return;

  /* Otherwise, we're really honest and truly being told to drop it.
     Don't use Fdelq as that may QUIT;.  */

  if (EQ (local_selection_data, Fcar (Vselection_alist)))
    Vselection_alist = Fcdr (Vselection_alist);
  else
    {
      Lisp_Object rest;
      for (rest = Vselection_alist; !NILP (rest); rest = Fcdr (rest))
	if (EQ (local_selection_data, Fcar (XCONS (rest)->cdr)))
	  {
	    XCONS (rest)->cdr = Fcdr (XCONS (rest)->cdr);
	    break;
	  }
    }

  /* Let random lisp code notice that the selection has been stolen.  */

  {
808 809
    Lisp_Object rest;
    rest = Vx_lost_selection_hooks;
Richard M. Stallman's avatar
Richard M. Stallman committed
810
    if (!EQ (rest, Qunbound))
811 812 813
      {
	for (; CONSP (rest); rest = Fcdr (rest))
	  call1 (Fcar (rest), selection_symbol);
814
	prepare_menu_bars ();
815 816
	redisplay_preserve_echo_area ();
      }
Richard M. Stallman's avatar
Richard M. Stallman committed
817 818 819
  }
}

820 821 822 823 824 825 826 827 828 829
/* Clear all selections that were made from frame F.
   We do this when about to delete a frame.  */

void
x_clear_frame_selections (f)
     FRAME_PTR f;
{
  Lisp_Object frame;
  Lisp_Object rest;

830
  XSETFRAME (frame, f);
831 832 833 834

  /* Otherwise, we're really honest and truly being told to drop it.
     Don't use Fdelq as that may QUIT;.  */

835 836 837 838 839 840 841 842 843 844 845 846 847 848
  /* Delete elements from the beginning of Vselection_alist.  */
  while (!NILP (Vselection_alist)
	 && EQ (frame, Fcar (Fcdr (Fcdr (Fcdr (Fcar (Vselection_alist)))))))
    {
      /* Let random Lisp code notice that the selection has been stolen.  */
      Lisp_Object hooks, selection_symbol;

      hooks = Vx_lost_selection_hooks;
      selection_symbol = Fcar (Fcar (Vselection_alist));

      if (!EQ (hooks, Qunbound))
	{
	  for (; CONSP (hooks); hooks = Fcdr (hooks))
	    call1 (Fcar (hooks), selection_symbol);
849 850 851
#if 0 /* This can crash when deleting a frame
	 from x_connection_closed.  Anyway, it seems unnecessary;
	 something else should cause a redisplay.  */
852
	  redisplay_preserve_echo_area ();
853
#endif
854 855 856 857 858 859
	}

      Vselection_alist = Fcdr (Vselection_alist);
    }

  /* Delete elements after the beginning of Vselection_alist.  */
860 861 862 863 864 865 866
  for (rest = Vselection_alist; !NILP (rest); rest = Fcdr (rest))
    if (EQ (frame, Fcar (Fcdr (Fcdr (Fcdr (Fcar (XCONS (rest)->cdr)))))))
      {
	/* Let random Lisp code notice that the selection has been stolen.  */
	Lisp_Object hooks, selection_symbol;

	hooks = Vx_lost_selection_hooks;
867
	selection_symbol = Fcar (Fcar (XCONS (rest)->cdr));
868 869 870 871 872

	if (!EQ (hooks, Qunbound))
	  {
	    for (; CONSP (hooks); hooks = Fcdr (hooks))
	      call1 (Fcar (hooks), selection_symbol);
873
#if 0 /* See above */
874
	    redisplay_preserve_echo_area ();
875
#endif
876 877 878 879 880
	  }
	XCONS (rest)->cdr = Fcdr (XCONS (rest)->cdr);
	break;
      }
}
Richard M. Stallman's avatar
Richard M. Stallman committed
881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903

/* Nonzero if any properties for DISPLAY and WINDOW
   are on the list of what we are waiting for.  */

static int
waiting_for_other_props_on_window (display, window)
     Display *display;
     Window window;
{
  struct prop_location *rest = property_change_wait_list;
  while (rest)
    if (rest->display == display && rest->window == window)
      return 1;
    else
      rest = rest->next;
  return 0;
}

/* Add an entry to the list of property changes we are waiting for.
   DISPLAY, WINDOW, PROPERTY, STATE describe what we will wait for.
   The return value is a number that uniquely identifies
   this awaited property change.  */

904
static struct prop_location *
Richard M. Stallman's avatar
Richard M. Stallman committed
905 906 907
expect_property_change (display, window, property, state)
     Display *display;
     Window window;
908
     Atom property;
Richard M. Stallman's avatar
Richard M. Stallman committed
909 910 911 912
     int state;
{
  struct prop_location *pl
    = (struct prop_location *) xmalloc (sizeof (struct prop_location));
913
  pl->identifier = ++prop_location_identifier;
Richard M. Stallman's avatar
Richard M. Stallman committed
914 915 916 917 918
  pl->display = display;
  pl->window = window;
  pl->property = property;
  pl->desired_state = state;
  pl->next = property_change_wait_list;
919
  pl->arrived = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
920
  property_change_wait_list = pl;
921
  return pl;
Richard M. Stallman's avatar
Richard M. Stallman committed
922 923 924
}

/* Delete an entry from the list of property changes we are waiting for.
925
   IDENTIFIER is the number that uniquely identifies the entry.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
926 927

static void
928 929
unexpect_property_change (location)
     struct prop_location *location;
Richard M. Stallman's avatar
Richard M. Stallman committed
930 931 932 933
{
  struct prop_location *prev = 0, *rest = property_change_wait_list;
  while (rest)
    {
934
      if (rest == location)
Richard M. Stallman's avatar
Richard M. Stallman committed
935 936 937 938 939
	{
	  if (prev)
	    prev->next = rest->next;
	  else
	    property_change_wait_list = rest->next;
940
	  xfree (rest);
Richard M. Stallman's avatar
Richard M. Stallman committed
941 942 943 944 945 946 947
	  return;
	}
      prev = rest;
      rest = rest->next;
    }
}

948 949 950 951 952 953
/* Remove the property change expectation element for IDENTIFIER.  */

static Lisp_Object
wait_for_property_change_unwind (identifierval)
     Lisp_Object identifierval;
{
954 955 956
  unexpect_property_change ((struct prop_location *)
			    (XFASTINT (XCONS (identifierval)->car) << 16
			     | XFASTINT (XCONS (identifierval)->cdr)));
957
  return Qnil;
958 959
}

Richard M. Stallman's avatar
Richard M. Stallman committed
960
/* Actually wait for a property change.
961
   IDENTIFIER should be the value that expect_property_change returned.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
962 963

static void
964 965
wait_for_property_change (location)
     struct prop_location *location;
Richard M. Stallman's avatar
Richard M. Stallman committed
966
{
967 968
  int secs, usecs;
  int count = specpdl_ptr - specpdl;
969 970
  Lisp_Object tem;

971 972 973
  tem = Fcons (Qnil, Qnil);
  XSETFASTINT (XCONS (tem)->car, (EMACS_UINT)location >> 16);
  XSETFASTINT (XCONS (tem)->cdr, (EMACS_UINT)location & 0xffff);
974 975

  /* Make sure to do unexpect_property_change if we quit or err.  */
976
  record_unwind_protect (wait_for_property_change_unwind, tem);
977

Richard M. Stallman's avatar
Richard M. Stallman committed
978
  XCONS (property_change_reply)->car = Qnil;
979

980 981 982
  property_change_reply_object = location;
  /* If the event we are waiting for arrives beyond here, it will set
     property_change_reply, because property_change_reply_object says so.  */
983 984 985 986 987 988 989
  if (! location->arrived)
    {
      secs = x_selection_timeout / 1000;
      usecs = (x_selection_timeout % 1000) * 1000;
      wait_reading_process_input (secs, usecs, property_change_reply, 0);

      if (NILP (XCONS (property_change_reply)->car))
990
	error ("Timed out waiting for property-notify event");
991
    }
992 993

  unbind_to (count, Qnil);
Richard M. Stallman's avatar
Richard M. Stallman committed
994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
}

/* Called from XTread_socket in response to a PropertyNotify event.  */

void
x_handle_property_notify (event)
     XPropertyEvent *event;
{
  struct prop_location *prev = 0, *rest = property_change_wait_list;
  while (rest)
    {
      if (rest->property == event->atom
	  && rest->window == event->window
	  && rest->display == event->display
	  && rest->desired_state == event->state)
	{
#if 0
	  fprintf (stderr, "Saw expected prop-%s on %s\n",
		   (event->state == PropertyDelete ? "delete" : "change"),
1013
		   (char *) XSYMBOL (x_atom_to_symbol (dpyinfo, event->display,
Richard M. Stallman's avatar
Richard M. Stallman committed
1014 1015 1016 1017
						       event->atom))
		   ->name->data);
#endif

1018 1019
	  rest->arrived = 1;

Richard M. Stallman's avatar
Richard M. Stallman committed
1020 1021
	  /* If this is the one wait_for_property_change is waiting for,
	     tell it to wake up.  */
1022
	  if (rest == property_change_reply_object)
Richard M. Stallman's avatar
Richard M. Stallman committed
1023 1024 1025 1026 1027 1028
	    XCONS (property_change_reply)->car = Qt;

	  if (prev)
	    prev->next = rest->next;
	  else
	    property_change_wait_list = rest->next;
1029
	  xfree (rest);
Richard M. Stallman's avatar
Richard M. Stallman committed
1030 1031 1032 1033 1034 1035 1036 1037
	  return;
	}
      prev = rest;
      rest = rest->next;
    }
#if 0
  fprintf (stderr, "Saw UNexpected prop-%s on %s\n",
	   (event->state == PropertyDelete ? "delete" : "change"),
1038 1039
	   (char *) XSYMBOL (x_atom_to_symbol (dpyinfo,
					       event->display, event->atom))
Richard M. Stallman's avatar
Richard M. Stallman committed
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
	   ->name->data);
#endif
}



#if 0 /* #### MULTIPLE doesn't work yet */

static Lisp_Object
fetch_multiple_target (event)
     XSelectionRequestEvent *event;
{
  Display *display = event->display;
1053
  Window window = event->requestor;
Richard M. Stallman's avatar
Richard M. Stallman committed
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
  Atom target = event->target;
  Atom selection_atom = event->selection;
  int result;

  return
    Fcons (QMULTIPLE,
	   x_get_window_property_as_lisp_data (display, window, target,
					       QMULTIPLE, selection_atom));
}

static Lisp_Object
copy_multiple_data (obj)
     Lisp_Object obj;
{
  Lisp_Object vec;
  int i;
  int size;
  if (CONSP (obj))
    return Fcons (XCONS (obj)->car, copy_multiple_data (XCONS (obj)->cdr));
    
  CHECK_VECTOR (obj, 0);
  vec = Fmake_vector (size = XVECTOR (obj)->size, Qnil);
  for (i = 0; i < size; i++)
    {
      Lisp_Object vec2 = XVECTOR (obj)->contents [i];
      CHECK_VECTOR (vec2, 0);
      if (XVECTOR (vec2)->size != 2)
	/* ??? Confusing error message */
	Fsignal (Qerror, Fcons (build_string ("vectors must be of length 2"),
				Fcons (vec2, Qnil)));
      XVECTOR (vec)->contents [i] = Fmake_vector (2, Qnil);
      XVECTOR (XVECTOR (vec)->contents [i])->contents [0]
	= XVECTOR (vec2)->contents [0];
      XVECTOR (XVECTOR (vec)->contents [i])->contents [1]
	= XVECTOR (vec2)->contents [1];
    }
  return vec;
}

#endif


/* Variables for communication with x_handle_selection_notify.  */
static Atom reading_which_selection;
static Lisp_Object reading_selection_reply;
static Window reading_selection_window;

/* Do protocol to read selection-data from the server.
   Converts this to Lisp data and returns it.  */

static Lisp_Object
x_get_foreign_selection (selection_symbol, target_type)
     Lisp_Object selection_symbol, target_type;
{
1108
  Window requestor_window = FRAME_X_WINDOW (selected_frame);
1109
  Display *display = FRAME_X_DISPLAY (selected_frame);
1110
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (selected_frame);
1111
  Time requestor_time = last_event_timestamp;
1112 1113
  Atom target_property = dpyinfo->Xatom_EMACS_TMP;
  Atom selection_atom = symbol_to_x_atom (dpyinfo, display, selection_symbol);
Richard M. Stallman's avatar
Richard M. Stallman committed
1114
  Atom type_atom;
1115
  int secs, usecs;
1116
  int count;
1117
  Lisp_Object frame;
Richard M. Stallman's avatar
Richard M. Stallman committed
1118 1119

  if (CONSP (target_type))
1120
    type_atom = symbol_to_x_atom (dpyinfo, display, XCONS (target_type)->car);
Richard M. Stallman's avatar
Richard M. Stallman committed
1121
  else
1122
    type_atom = symbol_to_x_atom (dpyinfo, display, target_type);
Richard M. Stallman's avatar
Richard M. Stallman committed
1123 1124

  BLOCK_INPUT;
1125
  count = x_catch_errors (display);
Richard M. Stallman's avatar
Richard M. Stallman committed
1126
  XConvertSelection (display, selection_atom, type_atom, target_property,
1127
		     requestor_window, requestor_time);
1128
  XFlush (display);
Richard M. Stallman's avatar
Richard M. Stallman committed
1129 1130

  /* Prepare to block until the reply has been read.  */
1131
  reading_selection_window = requestor_window;
Richard M. Stallman's avatar
Richard M. Stallman committed
1132 1133
  reading_which_selection = selection_atom;
  XCONS (reading_selection_reply)->car = Qnil;
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146

  frame = some_frame_on_display (dpyinfo);

  /* If the display no longer has frames, we can't expect
     to get many more selection requests from it, so don't
     bother trying to queue them.  */
  if (!NILP (frame))
    {
      x_start_queuing_selection_requests (display);

      record_unwind_protect (queue_selection_requests_unwind,
			     frame);
    }
Richard M. Stallman's avatar
Richard M. Stallman committed
1147 1148
  UNBLOCK_INPUT;

1149 1150 1151 1152
  /* This allows quits.  Also, don't wait forever.  */
  secs = x_selection_timeout / 1000;
  usecs = (x_selection_timeout % 1000) * 1000;
  wait_reading_process_input (secs, usecs, reading_selection_reply, 0);
Richard M. Stallman's avatar
Richard M. Stallman committed
1153

1154
  BLOCK_INPUT;
1155
  x_check_errors (display, "Cannot get selection: %s");
1156
  x_uncatch_errors (display, count);
1157 1158
  UNBLOCK_INPUT;

Richard M. Stallman's avatar
Richard M. Stallman committed
1159
  if (NILP (XCONS (reading_selection_reply)->car))