--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/xselect.c	Mon Aug 13 08:45:50 2007 +0200
@@ -0,0 +1,2128 @@
+/* X Selection processing for XEmacs
+   Copyright (C) 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
+
+This file is part of XEmacs.
+
+XEmacs 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.
+
+XEmacs 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 XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Synched up with: Not synched with FSF. */
+
+/* Rewritten by jwz */
+
+#include <config.h>
+#include "lisp.h"
+
+#include "buffer.h"
+#include "console-x.h"
+#include "objects-x.h"
+
+#include "frame.h"
+#include "opaque.h"
+#include "systime.h"
+
+#ifdef LWLIB_USES_MOTIF
+# define MOTIF_CLIPBOARDS
+#endif
+
+#ifdef MOTIF_CLIPBOARDS
+# include <Xm/CutPaste.h>
+static void hack_motif_clipboard_selection (Atom selection_atom,
+					    Lisp_Object selection_value,
+					    Time thyme, Display *display,
+					    Window selecting_window,
+					    Bool owned_p);
+#endif
+
+#define CUT_BUFFER_SUPPORT
+
+Lisp_Object QPRIMARY, QSECONDARY, QSTRING, QINTEGER, QCLIPBOARD, QTIMESTAMP,
+  QTEXT, QDELETE, QMULTIPLE, QINCR, QEMACS_TMP, QTARGETS, QATOM, QNULL,
+  QATOM_PAIR, QCOMPOUND_TEXT;
+
+#ifdef EPOCH
+Lisp_Object QARC, QBITMAP, QCARDINAL, QCURSOR, QDRAWABLE, QFONT, QINTEGER,
+  QPIXMAP, QPOINT, QRECTANGLE, QWINDOW, QWM_HINTS, QWM_SIZE_HINTS;
+#endif /* EPOCH */
+
+#ifdef CUT_BUFFER_SUPPORT
+Lisp_Object QCUT_BUFFER0, QCUT_BUFFER1, QCUT_BUFFER2, QCUT_BUFFER3,
+  QCUT_BUFFER4, QCUT_BUFFER5, QCUT_BUFFER6, QCUT_BUFFER7;
+#endif
+
+Lisp_Object Vx_lost_selection_hooks;
+Lisp_Object Vx_sent_selection_hooks;
+
+/* 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
+   incremental transfer stuff, but it might improve server performance.
+ */
+#define MAX_SELECTION_QUANTUM 0xFFFFFF
+
+#define SELECTION_QUANTUM(dpy) ((XMaxRequestSize (dpy) << 2) - 100)
+
+/* This is an association list whose elements are of the form
+     ( selection-name selection-value selection-timestamp )
+   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.
+     It may be any kind of Lisp object.
+   selection-timestamp is the time at which emacs began owning this selection,
+     as a cons of two 16-bit numbers (making a 32 bit time).
+   If there is an entry in this alist, then it can be assumed that emacs owns
+    that selection.
+   The only (eq) parts of this list that are visible from elisp are the
+    selection-values.
+ */
+Lisp_Object Vselection_alist;
+
+/* 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 elisp-level extension of the emacs
+   selection handling.
+ */
+Lisp_Object Vselection_converter_alist;
+
+/* If the selection owner takes too long to reply to a selection request,
+   we give up on it.  This is in seconds (0 = no timeout).
+ */
+int x_selection_timeout;
+
+
+/* Utility functions */
+
+static void lisp_data_to_selection_data (struct device *,
+					 Lisp_Object obj,
+					 unsigned char **data_ret,
+					 Atom *type_ret,
+					 unsigned int *size_ret,
+					 int *format_ret);
+static Lisp_Object selection_data_to_lisp_data (struct device *,
+						unsigned char *data,
+						int size,
+						Atom type,
+						int format);
+static Lisp_Object x_get_window_property_as_lisp_data (Display *,
+						       Window,
+						       Atom property,
+						       Lisp_Object target_type,
+						       Atom selection_atom);
+
+static int expect_property_change (Display *, Window, Atom prop, int state);
+static void wait_for_property_change (long);
+static void unexpect_property_change (int);
+static int waiting_for_other_props_on_window (Display *, Window);
+
+/* This converts a Lisp symbol to a server Atom, avoiding a server 
+   roundtrip whenever possible.
+ */
+Atom
+symbol_to_x_atom (struct device *d, Lisp_Object sym, int only_if_exists)
+{
+  Display *display = DEVICE_X_DISPLAY (d);
+  Atom val;
+  if (NILP (sym))	    return XA_PRIMARY;
+  if (EQ (sym, Qt))	    return XA_SECONDARY;
+  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;
+  if (EQ (sym, QCLIPBOARD)) return DEVICE_XATOM_CLIPBOARD (d);
+  if (EQ (sym, QTIMESTAMP)) return DEVICE_XATOM_TIMESTAMP (d);
+  if (EQ (sym, QTEXT))	    return DEVICE_XATOM_TEXT (d);
+  if (EQ (sym, QDELETE))    return DEVICE_XATOM_DELETE (d);
+  if (EQ (sym, QMULTIPLE))  return DEVICE_XATOM_MULTIPLE (d);
+  if (EQ (sym, QINCR))	    return DEVICE_XATOM_INCR (d);
+  if (EQ (sym, QEMACS_TMP)) return DEVICE_XATOM_EMACS_TMP (d);
+  if (EQ (sym, QTARGETS))   return DEVICE_XATOM_TARGETS (d);
+  if (EQ (sym, QNULL))	    return DEVICE_XATOM_NULL (d);
+  if (EQ (sym, QATOM_PAIR)) return DEVICE_XATOM_ATOM_PAIR (d);
+  if (EQ (sym, QCOMPOUND_TEXT)) return DEVICE_XATOM_COMPOUND_TEXT (d);
+#ifdef EPOCH
+  if (EQ (sym, QARC))       return XA_ARC;
+  if (EQ (sym, QBITMAP))    return XA_BITMAP;
+  if (EQ (sym, QCARDINAL))  return XA_CARDINAL;
+  if (EQ (sym, QCURSOR))    return XA_CURSOR;
+  if (EQ (sym, QDRAWABLE))  return XA_DRAWABLE;
+  if (EQ (sym, QFONT))      return XA_FONT;
+  if (EQ (sym, QINTEGER))   return XA_INTEGER;
+  if (EQ (sym, QPIXMAP))    return XA_PIXMAP;
+  if (EQ (sym, QPOINT))     return XA_POINT;
+  if (EQ (sym, QRECTANGLE)) return XA_RECTANGLE;
+  if (EQ (sym, QWINDOW))    return XA_WINDOW;
+  if (EQ (sym, QWM_HINTS))  return XA_WM_HINTS;
+  if (EQ (sym, QWM_SIZE_HINTS)) return XA_WM_SIZE_HINTS;
+#endif /* EPOCH */
+
+#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
+  {
+    CONST char *nameext;
+    Lisp_Object namesym;
+    XSETSTRING (namesym, XSYMBOL (sym)->name);
+    GET_C_STRING_CTEXT_DATA_ALLOCA (namesym, nameext);
+    val = XInternAtom (display, nameext, only_if_exists ? True : False);
+  }
+  return val;
+}
+
+
+/* This converts a server Atom to a Lisp symbol, avoiding server roundtrips
+   and calls to intern whenever possible.
+ */
+Lisp_Object
+x_atom_to_symbol (struct device *d, Atom atom)
+{
+  char *str;
+  Display *display = DEVICE_X_DISPLAY (d);
+
+  if (! atom) return Qnil;
+  if (atom == XA_PRIMARY)      return QPRIMARY;
+  if (atom == XA_SECONDARY)    return QSECONDARY;
+  if (atom == XA_STRING)       return QSTRING;
+  if (atom == XA_INTEGER)      return QINTEGER;
+  if (atom == XA_ATOM)	       return QATOM;
+  if (atom == DEVICE_XATOM_CLIPBOARD (d)) return QCLIPBOARD;
+  if (atom == DEVICE_XATOM_TIMESTAMP (d)) return QTIMESTAMP;
+  if (atom == DEVICE_XATOM_TEXT (d))      return QTEXT;
+  if (atom == DEVICE_XATOM_DELETE (d))    return QDELETE;
+  if (atom == DEVICE_XATOM_MULTIPLE (d))  return QMULTIPLE;
+  if (atom == DEVICE_XATOM_INCR (d))      return QINCR;
+  if (atom == DEVICE_XATOM_EMACS_TMP (d)) return QEMACS_TMP;
+  if (atom == DEVICE_XATOM_TARGETS (d))   return QTARGETS;
+  if (atom == DEVICE_XATOM_NULL (d))      return QNULL;
+  if (atom == DEVICE_XATOM_ATOM_PAIR (d)) return QATOM_PAIR;
+  if (atom == DEVICE_XATOM_COMPOUND_TEXT (d)) return QCOMPOUND_TEXT;
+
+#ifdef EPOCH
+  if (atom == XA_ARC)          return QARC;
+  if (atom == XA_BITMAP)       return QBITMAP;
+  if (atom == XA_CARDINAL)     return QCARDINAL;
+  if (atom == XA_CURSOR)       return QCURSOR;
+  if (atom == XA_DRAWABLE)     return QDRAWABLE;
+  if (atom == XA_FONT)         return QFONT;
+  if (atom == XA_INTEGER)      return QINTEGER;
+  if (atom == XA_PIXMAP)       return QPIXMAP;
+  if (atom == XA_POINT)        return QPOINT;
+  if (atom == XA_RECTANGLE)    return QRECTANGLE;
+  if (atom == XA_WINDOW)       return QWINDOW;
+  if (atom == XA_WM_HINTS)     return QWM_HINTS;
+  if (atom == XA_WM_SIZE_HINTS) return QWM_SIZE_HINTS;
+#endif /* EPOCH */
+#ifdef CUT_BUFFER_SUPPORT
+  if (atom == XA_CUT_BUFFER0) return QCUT_BUFFER0;
+  if (atom == XA_CUT_BUFFER1) return QCUT_BUFFER1;
+  if (atom == XA_CUT_BUFFER2) return QCUT_BUFFER2;
+  if (atom == XA_CUT_BUFFER3) return QCUT_BUFFER3;
+  if (atom == XA_CUT_BUFFER4) return QCUT_BUFFER4;
+  if (atom == XA_CUT_BUFFER5) return QCUT_BUFFER5;
+  if (atom == XA_CUT_BUFFER6) return QCUT_BUFFER6;
+  if (atom == XA_CUT_BUFFER7) return QCUT_BUFFER7;
+#endif
+
+  str = XGetAtomName (display, atom);
+  if (! str) return Qnil;
+  {
+    CONST char *intstr;
+    Lisp_Object val;
+
+    GET_C_CHARPTR_INT_CTEXT_DATA_ALLOCA (str, intstr);
+    val = intern (intstr);
+    XFree (str);
+    return val;
+  }
+}
+
+
+/* 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 (Lisp_Object selection_name, Lisp_Object selection_value)
+{
+  struct device *d = decode_x_device (Qnil);
+  Display *display = DEVICE_X_DISPLAY (d);
+  struct frame *sel_frame = selected_frame ();
+  Window selecting_window = XtWindow (FRAME_X_TEXT_WIDGET (sel_frame));
+  /* Use the time of the last-read mouse or keyboard event. 
+     For selection purposes, we use this as a sleazy way of knowing what the
+     current time is in server-time.  This assumes that the most recently read
+     mouse or keyboard event has something to do with the assertion of the
+     selection, which is probably true.
+     */
+  Time thyme = DEVICE_X_MOUSE_TIMESTAMP (d);
+  Atom selection_atom;
+
+  CHECK_SYMBOL (selection_name);
+  selection_atom = symbol_to_x_atom (d, selection_name, 0);
+
+  XSetSelectionOwner (display, selection_atom, selecting_window, thyme);
+
+  /* Now update the local cache */
+  {
+    /* We do NOT use time_to_lisp() here any more, like we used to.
+       That assumed equivalence of time_t and Time, which is not
+       necessarily the case (e.g. under OSF on the Alphas, where
+       Time is a 64-bit quantity and time_t is a 32-bit quantity).
+
+       Opaque pointers are the clean way to go here.
+     */
+    Lisp_Object selection_time = make_opaque (sizeof (thyme), (void *) &thyme);
+    Lisp_Object selection_data = Fcons (selection_name,
+					Fcons (selection_value,
+					       Fcons (selection_time, Qnil)));
+    Lisp_Object 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 (XCDR (rest))))
+	    {
+	      XCDR (rest) = Fcdr (XCDR (rest));
+	      break;
+	    }
+      }
+#ifdef MOTIF_CLIPBOARDS
+    hack_motif_clipboard_selection (selection_atom, selection_value,
+				    thyme, display, selecting_window,
+				    !NILP (prev_value));
+#endif
+  }
+}
+
+
+#ifdef MOTIF_CLIPBOARDS /* Bend over baby.  Take it and like it. */
+
+# ifdef MOTIF_INCREMENTAL_CLIPBOARDS_WORK
+static void motif_clipboard_cb ();
+# endif
+
+static void
+hack_motif_clipboard_selection (Atom selection_atom,
+				Lisp_Object selection_value,
+				Time thyme,
+				Display *display,
+				Window selecting_window,
+				Bool owned_p)
+{
+  struct device *d = get_device_from_display (display);
+  /* Those Motif wankers can't be bothered to follow the ICCCM, and do
+     their own non-Xlib non-Xt clipboard processing.  So we have to do
+     this so that linked-in Motif widgets don't get themselves wedged.
+   */
+  if (selection_atom == DEVICE_XATOM_CLIPBOARD (d)
+      && STRINGP (selection_value)
+
+      /* If we already own the clipboard, don't own it again in the Motif
+	 way.  This might lose in some subtle way, since the timestamp won't
+	 be current, but owning the selection on the Motif way does a
+	 SHITLOAD of X protocol, and it makes killing text be incredibly
+	 slow when using an X terminal.  ARRRRGGGHHH!!!!
+       */
+      /* No, this is no good, because then Motif text fields don't bother
+	 to look up the new value, and you can't Copy from a buffer, Paste
+	 into a text field, then Copy something else from the buffer and
+	 paste it intot he text field -- it pastes the first thing again. */
+/*      && !owned_p */
+      )
+    {
+#ifdef MOTIF_INCREMENTAL_CLIPBOARDS_WORK
+      Widget widget = FRAME_X_TEXT_WIDGET (selected_frame());
+#endif
+      long itemid;
+#if XmVersion >= 1002
+      long dataid;
+#else
+      int dataid;	/* 1.2 wants long, but 1.1.5 wants int... */
+#endif
+      XmString fmh;
+      fmh = XmStringCreateLtoR ("Clipboard", XmSTRING_DEFAULT_CHARSET);
+      while (ClipboardSuccess !=
+	     XmClipboardStartCopy (display, selecting_window, fmh, thyme,
+#ifdef MOTIF_INCREMENTAL_CLIPBOARDS_WORK
+				   widget, motif_clipboard_cb,
+#else
+				   0, NULL,
+#endif
+				   &itemid))
+	;
+      XmStringFree (fmh);
+      while (ClipboardSuccess !=
+	     XmClipboardCopy (display, selecting_window, itemid, "STRING",
+#ifdef MOTIF_INCREMENTAL_CLIPBOARDS_WORK
+			      /* O'Reilly examples say size can be 0, 
+				 but this clearly is not the case. */
+			      0, string_length (XSTRING (selection_value)) + 1,
+			      (int) selecting_window, /* private id */
+#else /* !MOTIF_INCREMENTAL_CLIPBOARDS_WORK */
+			      (char *) string_data (XSTRING (selection_value)),
+			      string_length (XSTRING (selection_value)) + 1,
+			      0,
+#endif /* !MOTIF_INCREMENTAL_CLIPBOARDS_WORK */
+			      &dataid))
+	;
+      while (ClipboardSuccess !=
+	     XmClipboardEndCopy (display, selecting_window, itemid))
+	;
+    }
+}
+
+# ifdef MOTIF_INCREMENTAL_CLIPBOARDS_WORK
+/* I tried to treat the clipboard like a real selection, and not send
+   the data until it was requested, but it looks like that just doesn't
+   work at all unless the selection owner and requestor are in different
+   processes.  From reading the Motif source, it looks like they never
+   even considered having two widgets in the same application transfer
+   data between each other using "by-name" clipboard values.  What a
+   bunch of fuckups.
+ */
+static void
+motif_clipboard_cb (Widget widget, int *data_id, int *private_id, int *reason)
+{
+  switch (*reason)
+    {
+    case XmCR_CLIPBOARD_DATA_REQUEST:
+      {
+	Display *dpy = XtDisplay (widget);
+	Window window = (Window) *private_id;
+	Lisp_Object selection = assq_no_quit (QCLIPBOARD, Vselection_alist);
+	if (NILP (selection)) abort ();
+	selection = XCDR (selection);
+	if (!STRINGP (selection)) abort ();
+	XmClipboardCopyByName (dpy, window, *data_id,
+			       (char *) string_data (XSTRING (selection)),
+			       string_length (XSTRING (selection)) + 1,
+			       0);
+      }
+      break;
+    case XmCR_CLIPBOARD_DATA_DELETE:
+    default:
+      /* don't need to free anything */
+      break;
+    }
+}
+# endif /* MOTIF_INCREMENTAL_CLIPBOARDS_WORK */
+#endif /* MOTIF_CLIPBOARDS */
+
+
+/* Given a selection-name and desired type, this looks up our local copy of
+   the selection value and converts it to the type.  It returns nil or a
+   string.  This calls random elisp code, and may signal or gc.
+ */
+static Lisp_Object
+x_get_local_selection (Lisp_Object selection_symbol, Lisp_Object target_type)
+{
+  /* This function can GC */
+  Lisp_Object local_value = assq_no_quit (selection_symbol, Vselection_alist);
+  Lisp_Object handler_fn, value, check;
+
+  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 = XCAR (XCDR (XCDR (local_value)));
+    }
+
+#if 0 /* #### MULTIPLE doesn't work yet */
+  else if (CONSP (target_type) &&
+	   XCAR (target_type) == QMULTIPLE)
+    {
+      Lisp_Object pairs = XCDR (target_type);
+      int size = XVECTOR (pairs)->size;
+      int i;
+      /* 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++)
+	{
+	  Lisp_Object pair = vector_data (XVECTOR (pairs)) [i];
+	  vector_data (XVECTOR (pair)) [1] =
+	    x_get_local_selection (vector_data (XVECTOR (pair)) [0],
+				   vector_data (XVECTOR (pair)) [1]);
+	}
+      return pairs;
+    }
+#endif
+  else
+    {
+      CHECK_SYMBOL (target_type);
+      handler_fn = Fcdr (Fassq (target_type, Vselection_converter_alist));
+      if (NILP (handler_fn)) return Qnil;
+      value = call3 (handler_fn,
+		     selection_symbol, target_type,
+		     XCAR (XCDR (local_value)));
+    }
+
+  /* This lets the selection function to return (TYPE . VALUE).  For example,
+     when the selected type is LINE_NUMBER, the returned type is SPAN, not
+     INTEGER.
+   */
+  check = value;
+  if (CONSP (value) && SYMBOLP (XCAR (value)))
+    check = XCDR (value);
+  
+  /* Strings, vectors, and symbols are converted to selection data format in
+     the obvious way.  Integers are converted to 16 bit quantities if they're
+     small enough, otherwise 32 bits are used.
+   */
+  if (STRINGP (check) ||
+      VECTORP (check) ||
+      SYMBOLP (check) ||
+      INTP (check) ||
+      CHARP (check) ||
+      NILP (value))
+    return value;
+
+  /* (N . M) or (N M) get turned into a 32 bit quantity.  So if you want to
+     always return a small quantity as 32 bits, your converter routine needs
+     to return a cons.
+   */
+  else if (CONSP (check) &&
+	   INTP (XCAR (check)) &&
+	   (INTP (XCDR (check)) ||
+	    (CONSP (XCDR (check)) &&
+	     INTP (XCAR (XCDR (check))) &&
+	     NILP (XCDR (XCDR (check))))))
+    return value;
+  /* Otherwise the lisp converter function returned something unrecognized. 
+   */
+  else
+    signal_error (Qerror,
+                  list3 (build_string
+			 ("unrecognized selection-conversion type"),
+                         handler_fn,
+                         value));
+
+  return Qnil;	/* suppress compiler warning */
+}
+
+
+
+/* Send a SelectionNotify event to the requestor with property=None, meaning
+   we were unable to do what they wanted.
+ */
+static void
+x_decline_selection_request (XSelectionRequestEvent *event)
+{
+  XSelectionEvent reply;
+  reply.type = SelectionNotify;
+  reply.display = event->display;
+  reply.requestor = event->requestor;
+  reply.selection = event->selection;
+  reply.time = event->time;
+  reply.target = event->target;
+  reply.property = None;
+
+  (void) XSendEvent (reply.display, reply.requestor, False, 0L,
+		     (XEvent *) &reply);
+  XFlush (reply.display);
+}
+
+
+/* Used as an unwind-protect clause so that, if a selection-converter signals
+   an error, we tell the requestor that we were unable to do what they wanted
+   before we throw to top-level or go into the debugger or whatever.
+ */
+static Lisp_Object
+x_selection_request_lisp_error (Lisp_Object closure)
+{
+  XSelectionRequestEvent *event = (XSelectionRequestEvent *)
+    get_opaque_ptr (closure);
+
+  free_opaque_ptr (closure);
+  if (event->type == 0) /* we set this to mean "completed normally" */
+    return Qnil;
+  x_decline_selection_request (event);
+  return Qnil;
+}
+
+
+/* Convert our selection to the requested type, and put that data where the
+   requestor wants it.  Then tell them whether we've succeeded.
+ */
+static void
+x_reply_selection_request (XSelectionRequestEvent *event, int format,
+			   unsigned char *data, int size, Atom type)
+{
+  /* This function can GC */
+  XSelectionEvent reply;
+  Display *display = event->display;
+  struct device *d = get_device_from_display (display);
+  Window window = event->requestor;
+  int bytes_remaining;
+  int format_bytes = format/8;
+  int max_bytes = SELECTION_QUANTUM (display);
+  if (max_bytes > MAX_SELECTION_QUANTUM) max_bytes = MAX_SELECTION_QUANTUM;
+
+  reply.type = SelectionNotify;
+  reply.display = display;
+  reply.requestor = window;
+  reply.selection = event->selection;
+  reply.time = event->time;
+  reply.target = event->target;
+  reply.property = (event->property == None ? event->target : event->property);
+
+  /* #### XChangeProperty can generate BadAlloc, and we must handle it! */
+
+  /* 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
+      stderr_out ("\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. */
+      (void) XSendEvent (display, window, False, 0L, (XEvent *) &reply);
+      XFlush (display);
+    }
+  else
+    {
+      /* Send an INCR selection. */
+      int prop_id;
+
+      if (x_window_to_frame (d, window)) /* #### debug */
+	error ("attempt to transfer an INCR to ourself!");
+#if 0
+      stderr_out ("\nINCR %d\n", bytes_remaining);
+#endif
+      prop_id = expect_property_change (display, window, reply.property,
+					PropertyDelete);
+
+      XChangeProperty (display, window, reply.property, DEVICE_XATOM_INCR (d),
+		       32, PropModeReplace, (unsigned char *)
+		       &bytes_remaining, 1);
+      XSelectInput (display, window, PropertyChangeMask);
+      /* Tell 'em the INCR data is there... */
+      (void) XSendEvent (display, window, False, 0L, (XEvent *) &reply);
+      XFlush (display);
+
+      /* First, wait for the requestor to ack by deleting the property.
+	 This can run random lisp code (process handlers) or signal.
+       */
+      wait_for_property_change (prop_id);
+
+      while (bytes_remaining)
+	{
+	  int i = ((bytes_remaining < max_bytes)
+		   ? bytes_remaining
+		   : max_bytes);
+	  prop_id = expect_property_change (display, window, reply.property,
+					    PropertyDelete);
+#if 0
+	  stderr_out ("  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;
+
+	  /* Now wait for the requestor to ack this chunk by deleting the
+	     property.	 This can run random lisp code or signal.
+	   */
+	  wait_for_property_change (prop_id);
+	}
+      /* Now write a zero-length chunk to the property to tell the requestor
+	 that we're done. */
+#if 0
+      stderr_out ("  INCR done\n");
+#endif
+      if (! waiting_for_other_props_on_window (display, window))
+	XSelectInput (display, window, 0L);
+
+      XChangeProperty (display, window, reply.property, type, format,
+		       PropModeReplace, data, 0);
+    }
+}
+
+
+
+/* Called from the event-loop in response to a SelectionRequest event.
+ */
+void
+x_handle_selection_request (XSelectionRequestEvent *event)
+{
+  /* This function can GC */
+  struct gcpro gcpro1, gcpro2, gcpro3;
+  XSelectionEvent reply;
+  Lisp_Object local_selection_data = Qnil;
+  Lisp_Object selection_symbol;
+  Lisp_Object target_symbol = Qnil;
+  Lisp_Object converted_selection = Qnil;
+  Time local_selection_time;
+  Lisp_Object successful_p = Qnil;
+  int count;
+  struct device *d = get_device_from_display (event->display);
+
+  GCPRO3 (local_selection_data, converted_selection, target_symbol);
+
+  reply.type = SelectionNotify;		/* Construct the reply event */
+  reply.display = event->display;
+  reply.requestor = event->requestor;
+  reply.selection = event->selection;
+  reply.time = event->time;
+  reply.target = event->target;
+  reply.property = (event->property == None ? event->target : event->property);
+
+  selection_symbol = x_atom_to_symbol (d, event->selection);
+
+  local_selection_data = assq_no_quit (selection_symbol, Vselection_alist);
+  
+#if 0
+# define CDR(x) (XCDR (x))
+# define CAR(x) (XCAR (x))
+  /* This list isn't user-visible, so it can't "go bad." */
+  if (!CONSP (local_selection_data)) abort ();
+  if (!CONSP (CDR (local_selection_data))) abort ();
+  if (!CONSP (CDR (CDR (local_selection_data)))) abort ();
+  if (!NILP (CDR (CDR (CDR (local_selection_data))))) abort ();
+  if (!CONSP (CAR (CDR (CDR (local_selection_data))))) abort ();
+  if (!INTP (CAR (CAR (CDR (CDR (local_selection_data)))))) abort ();
+  if (!INTP (CDR (CAR (CDR (CDR (local_selection_data)))))) abort ();
+# undef CAR
+# undef CDR
+#endif
+
+  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_LABEL;
+    }
+
+  local_selection_time =
+    * (Time *) XOPAQUE_DATA (XCAR (XCDR (XCDR (local_selection_data))));
+
+  if (event->time != CurrentTime &&
+      local_selection_time > event->time)
+    {
+      /* Someone asked for the selection, and we have one, but not the one
+	 they're looking for.
+       */
+      x_decline_selection_request (event);
+      goto DONE_LABEL;
+    }
+
+  count = specpdl_depth ();
+  record_unwind_protect (x_selection_request_lisp_error,
+			 make_opaque_ptr (event));
+  target_symbol = x_atom_to_symbol (d, event->target);
+
+#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;
+      lisp_data_to_selection_data (d, converted_selection,
+				   &data, &type, &size, &format);
+      
+      x_reply_selection_request (event, format, data, size, type);
+      successful_p = Qt;
+      /* Tell x_selection_request_lisp_error() it's cool. */
+      event->type = 0;
+      xfree (data);
+    }
+  unbind_to (count, Qnil);
+
+ DONE_LABEL:
+
+  UNGCPRO;
+
+  /* Let random lisp code notice that the selection has been asked for.
+   */
+  {
+    Lisp_Object rest;
+    Lisp_Object val = Vx_sent_selection_hooks;
+    if (!UNBOUNDP (val) && !NILP (val))
+      {
+	if (CONSP (val) && !EQ (XCAR (val), Qlambda))
+	  for (rest = val; !NILP (rest); rest = Fcdr (rest))
+	    call3 (Fcar(rest), selection_symbol, target_symbol,
+		   successful_p);
+	else
+	  call3 (val, selection_symbol, target_symbol,
+		 successful_p);
+      }
+  }
+}
+
+
+/* Called from the event-loop in response to a SelectionClear event.
+ */
+void
+x_handle_selection_clear (XSelectionClearEvent *event)
+{
+  Display *display = event->display;
+  struct device *d = get_device_from_display (display);
+  Atom selection = event->selection;
+  Time changed_owner_time = event->time;
+  
+  Lisp_Object selection_symbol, local_selection_data;
+  Time local_selection_time;
+
+  selection_symbol = x_atom_to_symbol (d, selection);
+
+  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 *) XOPAQUE_DATA (XCAR (XCDR (XCDR (local_selection_data))));
+
+  /* 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 (XCDR (rest))))
+	  {
+	    XCDR (rest) = Fcdr (XCDR (rest));
+	    break;
+	  }
+    }
+
+  /* Let random lisp code notice that the selection has been stolen.
+   */
+  {
+    Lisp_Object rest;
+    Lisp_Object val = Vx_lost_selection_hooks;
+    if (!UNBOUNDP (val) && !NILP (val))
+      {
+	if (CONSP (val) && !EQ (XCAR (val), Qlambda))
+	  for (rest = val; !NILP (rest); rest = Fcdr (rest))
+	    call1 (Fcar (rest), selection_symbol);
+	else
+	  call1 (val, selection_symbol);
+      }
+  }
+}
+
+
+/* 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.
+ */
+
+static int prop_location_tick;
+
+static struct prop_location {
+  int tick;
+  Display *display;
+  Window window;
+  Atom property;
+  int desired_state;
+  struct prop_location *next;
+} *for_whom_the_bell_tolls;
+
+
+static int
+property_deleted_p (void *tick)
+{
+  struct prop_location *rest = for_whom_the_bell_tolls;
+  while (rest)
+    if (rest->tick == (long) tick)
+      return 0;
+    else
+      rest = rest->next;
+  return 1;
+}
+
+static int
+waiting_for_other_props_on_window (Display *display, Window window)
+{
+  struct prop_location *rest = for_whom_the_bell_tolls;
+  while (rest)
+    if (rest->display == display && rest->window == window)
+      return 1;
+    else
+      rest = rest->next;
+  return 0;
+}
+
+
+static int
+expect_property_change (Display *display, Window window,
+			Atom property, int state)
+{
+  struct prop_location *pl = (struct prop_location *)
+    xmalloc (sizeof (struct prop_location));
+  pl->tick = ++prop_location_tick;
+  pl->display = display;
+  pl->window = window;
+  pl->property = property;
+  pl->desired_state = state;
+  pl->next = for_whom_the_bell_tolls;
+  for_whom_the_bell_tolls = pl;
+  return pl->tick;
+}
+
+static void
+unexpect_property_change (int tick)
+{
+  struct prop_location *prev = 0, *rest = for_whom_the_bell_tolls;
+  while (rest)
+    {
+      if (rest->tick == tick)
+	{
+	  if (prev)
+	    prev->next = rest->next;
+	  else
+	    for_whom_the_bell_tolls = rest->next;
+	  xfree (rest);
+	  return;
+	}
+      prev = rest;
+      rest = rest->next;
+    }
+}
+
+static void
+wait_for_property_change (long tick)
+{
+  /* This function can GC */
+  wait_delaying_user_input (property_deleted_p, (void *) tick);
+}
+
+
+/* Called from the event-loop in response to a PropertyNotify event.
+ */
+void
+x_handle_property_notify (XPropertyEvent *event)
+{
+  struct prop_location *prev = 0, *rest = for_whom_the_bell_tolls;
+  while (rest)
+    {
+      if (rest->property == event->atom &&
+	  rest->window == event->window &&
+	  rest->display == event->display &&
+	  rest->desired_state == event->state)
+	{
+#if 0
+	  stderr_out ("Saw expected prop-%s on %s\n",
+		   (event->state == PropertyDelete ? "delete" : "change"),
+		      (char *) string_data (XSYMBOL (x_atom_to_symbol (get_device_from_display (event->display), event->atom))->name);
+#endif
+	  if (prev)
+	    prev->next = rest->next;
+	  else
+	    for_whom_the_bell_tolls = rest->next;
+	  xfree (rest);
+	  return;
+	}
+      prev = rest;
+      rest = rest->next;
+    }
+#if 0
+  stderr_out ("Saw UNexpected prop-%s on %s\n",
+	   (event->state == PropertyDelete ? "delete" : "change"),
+	   (char *) string_data (XSYMBOL (x_atom_to_symbol (get_device_from_display (event->display), event->atom))->name));
+#endif
+}
+
+
+
+#if 0 /* #### MULTIPLE doesn't work yet */
+
+static Lisp_Object
+fetch_multiple_target (XSelectionRequestEvent *event)
+{
+  /* This function can GC */
+  Display *display = event->display;
+  Window window = event->requestor;
+  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 (Lisp_Object obj)
+{
+  Lisp_Object vec;
+  int i;
+  int size;
+  if (CONSP (obj))
+    return Fcons (XCAR (obj), copy_multiple_data (XCDR (obj)));
+    
+  CHECK_VECTOR (obj);
+  size = XVECTOR (obj)->size;
+  vec = make_vector (size, Qnil);
+  for (i = 0; i < size; i++)
+    {
+      Lisp_Object vec2 = vector_data (XVECTOR (obj)) [i];
+      CHECK_VECTOR (vec2);
+      if (XVECTOR (vec2)->size != 2)
+	signal_error (Qerror, list2 (build_string
+				     ("vectors must be of length 2"),
+                                     vec2));
+      vector_data (XVECTOR (vec)) [i] = make_vector (2, Qnil);
+      vector_data (XVECTOR (vector_data (XVECTOR (vec)) [i])) [0] =
+	vector_data (XVECTOR (vec2)) [0];
+      vector_data (XVECTOR (vector_data (XVECTOR (vec)) [i])) [1] =
+	vector_data (XVECTOR (vec2)) [1];
+    }
+  return vec;
+}
+
+#endif
+
+
+static int reading_selection_reply;
+static Atom reading_which_selection;
+static int selection_reply_timed_out;
+
+static int
+selection_reply_done (void *ignore)
+{
+  return !reading_selection_reply;
+}
+
+static Lisp_Object Qx_selection_reply_timeout_internal;
+
+DEFUN ("x-selection-reply-timeout-internal",
+       Fx_selection_reply_timeout_internal,
+       Sx_selection_reply_timeout_internal, 1, 1, 0 /*
+
+*/ )
+     (arg)
+     Lisp_Object arg;
+{
+  selection_reply_timed_out = 1;
+  reading_selection_reply = 0;
+  return Qnil;
+}
+
+
+/* Do protocol to read selection-data from the server.
+   Converts this to lisp data and returns it.
+ */
+static Lisp_Object
+x_get_foreign_selection (Lisp_Object selection_symbol, Lisp_Object target_type)
+{
+  /* This function can GC */
+  struct device *d = decode_x_device (Qnil);
+  Display *display = DEVICE_X_DISPLAY (d);
+  struct frame *sel_frame = selected_frame ();
+  Window requestor_window = XtWindow (FRAME_X_TEXT_WIDGET (sel_frame));
+  Time requestor_time = DEVICE_X_MOUSE_TIMESTAMP (d);
+  Atom target_property = DEVICE_XATOM_EMACS_TMP (d);
+  Atom selection_atom = symbol_to_x_atom (d, selection_symbol, 0);
+  Atom type_atom;
+  int speccount;
+
+  if (CONSP (target_type))
+    type_atom = symbol_to_x_atom (d, XCAR (target_type), 0);
+  else
+    type_atom = symbol_to_x_atom (d, target_type, 0);
+
+  XConvertSelection (display, selection_atom, type_atom, target_property,
+		     requestor_window, requestor_time);
+
+  /* Block until the reply has been read. */
+  reading_selection_reply = (int) requestor_window;
+  reading_which_selection = selection_atom;
+  selection_reply_timed_out = 0;
+
+  speccount = specpdl_depth ();
+
+  /* add a timeout handler */
+  if (x_selection_timeout > 0)
+    {
+      Lisp_Object id = Fadd_timeout (make_int (x_selection_timeout),
+				     Qx_selection_reply_timeout_internal,
+				     Qnil, Qnil);
+      record_unwind_protect (Fdisable_timeout, id);
+    }
+
+  /* This is ^Gable */
+  wait_delaying_user_input (selection_reply_done, 0);
+
+  if (selection_reply_timed_out)
+    error ("timed out waiting for reply from selection owner");
+
+  unbind_to (speccount, Qnil);
+
+  /* otherwise, the selection is waiting for us on the requested property. */
+  return
+    x_get_window_property_as_lisp_data (display, requestor_window,
+					target_property, target_type,
+					selection_atom);
+}
+
+
+static void
+x_get_window_property (Display *display, Window window, Atom property,
+		       unsigned char **data_ret, int *bytes_ret,
+		       Atom *actual_type_ret, int *actual_format_ret,
+		       unsigned long *actual_size_ret, int delete_p)
+{
+  int total_size;
+  unsigned long bytes_remaining;
+  int offset = 0;
+  unsigned char *tmp_data = 0;
+  int result;
+  int buffer_size = SELECTION_QUANTUM (display);
+  if (buffer_size > MAX_SELECTION_QUANTUM) buffer_size = MAX_SELECTION_QUANTUM;
+  
+  /* First probe the thing to find out how big it is. */
+  result = XGetWindowProperty (display, window, property,
+			       0, 0, False, AnyPropertyType,
+			       actual_type_ret, actual_format_ret,
+			       actual_size_ret,
+			       &bytes_remaining, &tmp_data);
+  if (result != Success)
+    {
+      *data_ret = 0;
+      *bytes_ret = 0;
+      return;
+    }
+  XFree ((char *) tmp_data);
+  
+  if (*actual_type_ret == None || *actual_format_ret == 0)
+    {
+      if (delete_p) XDeleteProperty (display, window, property);
+      *data_ret = 0;
+      *bytes_ret = 0;
+      return;
+    }
+
+  total_size = bytes_remaining + 1;
+  *data_ret = (unsigned char *) xmalloc (total_size);
+  
+  /* Now read, until weve gotten it all. */
+  while (bytes_remaining)
+    {
+#if 0
+      int last = bytes_remaining;
+#endif
+      result =
+	XGetWindowProperty (display, window, property,
+			    offset/4, buffer_size/4,
+			    (delete_p ? True : False),
+			    AnyPropertyType,
+			    actual_type_ret, actual_format_ret,
+			    actual_size_ret, &bytes_remaining, &tmp_data);
+#if 0
+      stderr_out ("<< read %d\n", last-bytes_remaining);
+#endif
+      /* If this doesn't return Success at this point, it means that
+	 some clod deleted the selection while we were in the midst of
+	 reading it.  Deal with that, I guess....
+       */
+      if (result != Success) break;
+      *actual_size_ret *= *actual_format_ret / 8;
+      memcpy ((*data_ret) + offset, tmp_data, *actual_size_ret);
+      offset += *actual_size_ret;
+      XFree ((char *) tmp_data);
+    }
+  *bytes_ret = offset;
+}
+
+
+static void
+receive_incremental_selection (Display *display, Window window, Atom property,
+			       /* this one is for error messages only */
+			       Lisp_Object target_type,
+			       unsigned int min_size_bytes,
+			       unsigned char **data_ret, int *size_bytes_ret,
+			       Atom *type_ret, int *format_ret,
+			       unsigned long *size_ret)
+{
+  /* This function can GC */
+  int offset = 0;
+  int prop_id;
+  *size_bytes_ret = min_size_bytes;
+  *data_ret = (unsigned char *) xmalloc (*size_bytes_ret);
+#if 0
+  stderr_out ("\nread INCR %d\n", min_size_bytes);
+#endif
+  /* At this point, we have read an INCR property, and deleted it (which
+     is how we ack its receipt: the sending window will be selecting
+     PropertyNotify events on our window to notice this).
+
+     Now, we must loop, waiting for the sending window to put a value on
+     that property, then reading the property, then deleting it to ack.
+     We are done when the sender places a property of length 0.
+   */
+  prop_id = expect_property_change (display, window, property,
+				    PropertyNewValue);
+  while (1)
+    {
+      unsigned char *tmp_data;
+      int tmp_size_bytes;
+      wait_for_property_change (prop_id);
+      /* expect it again immediately, because x_get_window_property may
+	 .. no it wont, I dont get it.
+	 .. Ok, I get it now, the Xt code that implements INCR is broken.
+       */
+      prop_id = expect_property_change (display, window, property,
+					PropertyNewValue);
+      x_get_window_property (display, window, property,
+			     &tmp_data, &tmp_size_bytes,
+			     type_ret, format_ret, size_ret, 1);
+
+      if (tmp_size_bytes == 0) /* we're done */
+	{
+#if 0
+	  stderr_out ("  read INCR done\n");
+#endif
+	  unexpect_property_change (prop_id);
+	  if (tmp_data) xfree (tmp_data);
+	  break;
+	}
+#if 0
+      stderr_out ("  read INCR %d\n", tmp_size_bytes);
+#endif
+      if (*size_bytes_ret < offset + tmp_size_bytes)
+	{
+#if 0
+	  stderr_out ("  read INCR realloc %d -> %d\n",
+		   *size_bytes_ret, offset + tmp_size_bytes);
+#endif
+	  *size_bytes_ret = offset + tmp_size_bytes;
+	  *data_ret = (unsigned char *) xrealloc (*data_ret, *size_bytes_ret);
+	}
+      memcpy ((*data_ret) + offset, tmp_data, tmp_size_bytes);
+      offset += tmp_size_bytes;
+      xfree (tmp_data);
+    }
+}
+
+
+static Lisp_Object
+x_get_window_property_as_lisp_data (Display *display,
+				    Window window,
+				    Atom property,
+				    /* next two for error messages only */
+				    Lisp_Object target_type,
+				    Atom selection_atom)
+{
+  /* This function can GC */
+  Atom actual_type;
+  int actual_format;
+  unsigned long actual_size;
+  unsigned char *data = 0;
+  int bytes = 0;
+  Lisp_Object val;
+  struct device *d = get_device_from_display (display);
+
+  x_get_window_property (display, window, property, &data, &bytes,
+			 &actual_type, &actual_format, &actual_size, 1);
+  if (! data)
+    {
+      int there_is_a_selection_owner;
+      there_is_a_selection_owner =
+	XGetSelectionOwner (display, selection_atom);
+      signal_error (Qerror,
+        (there_is_a_selection_owner
+	 ? Fcons (build_string ("selection owner couldn't convert"),
+		  (actual_type
+		   ? list2 (target_type,
+			    x_atom_to_symbol (d, actual_type))
+		   : list1 (target_type)))
+	 : list2 (build_string ("no selection"),
+		  x_atom_to_symbol (d, selection_atom))));
+    }
+  
+  if (actual_type == DEVICE_XATOM_INCR (d))
+    {
+      /* Ok, that data wasnt *the* data, it was just the beginning. */
+
+      unsigned int min_size_bytes = * ((unsigned int *) data);
+      XFree ((char *) data);
+      receive_incremental_selection (display, window, property, target_type,
+				     min_size_bytes, &data, &bytes,
+				     &actual_type, &actual_format,
+				     &actual_size);
+    }
+
+  /* It's been read.  Now convert it to a lisp object in some semi-rational
+     manner.
+   */
+  val = selection_data_to_lisp_data (d, data, bytes,
+				     actual_type, actual_format);
+  
+  xfree (data);
+  return val;
+}
+
+/* These functions convert from the selection data read from the server into
+   something that we can use from elisp, and vice versa.
+
+	Type:	Format:	Size:		Elisp Type:
+	-----	-------	-----		-----------
+	*	8	*		String
+	ATOM	32	1		Symbol
+	ATOM	32	> 1		Vector of Symbols
+	*	16	1		Integer
+	*	16	> 1		Vector of Integers
+	*	32	1		if <=16 bits: Integer
+					if > 16 bits: Cons of top16, bot16
+	*	32	> 1		Vector of the above
+
+   When converting a Lisp number to C, it is assumed to be of format 16 if
+   it is an integer, and of format 32 if it is a cons of two integers.
+
+   When converting a vector of numbers from Elisp to C, it is assumed to be
+   of format 16 if every element in the vector is an integer, and is assumed
+   to be of format 32 if any element is a cons of two integers.
+
+   When converting an object to C, it may be of the form (SYMBOL . <data>)
+   where SYMBOL is what we should claim that the type is.  Format and
+   representation are as above.
+ */
+
+
+static Lisp_Object
+selection_data_to_lisp_data (struct device *d,
+			     unsigned char *data,
+			     int size,
+			     Atom type,
+			     int format)
+{
+  if (type == DEVICE_XATOM_NULL (d))
+    return QNULL;
+
+  /* Convert any 8-bit data to a string, for compactness. */
+  else if (format == 8)
+    return make_ext_string (data, size,
+			    type == DEVICE_XATOM_TEXT (d)
+			    || type == DEVICE_XATOM_COMPOUND_TEXT (d)
+			    ? FORMAT_CTEXT : FORMAT_BINARY);
+
+  /* Convert a single atom to a Lisp_Symbol.  Convert a set of atoms to
+     a vector of symbols.
+   */
+  else if (type == XA_ATOM)
+    {
+      int i;
+      if (size == sizeof (Atom))
+	return x_atom_to_symbol (d, *((Atom *) data));
+      else
+	{
+	  Lisp_Object v = Fmake_vector (make_int (size / sizeof (Atom)),
+					Qzero);
+	  for (i = 0; i < size / sizeof (Atom); i++)
+	    Faset (v, make_int (i),
+		   x_atom_to_symbol (d, ((Atom *) data) [i]));
+	  return v;
+	}
+    }
+
+  /* Convert a single 16 or small 32 bit number to a Lisp_Int.
+     If the number is > 16 bits, convert it to a cons of integers,
+     16 bits in each half.
+   */
+  else if (format == 32 && size == sizeof (long))
+    return word_to_lisp (((unsigned long *) data) [0]);
+  else if (format == 16 && size == sizeof (short))
+    return make_int ((int) (((unsigned short *) data) [0]));
+
+  /* Convert any other kind of data to a vector of numbers, represented
+     as above (as an integer, or a cons of two 16 bit integers).
+
+     #### Perhaps we should return the actual type to lisp as well.
+
+	(x-get-selection-internal 'PRIMARY 'LINE_NUMBER)
+	==> [4 4]
+
+     and perhaps it should be
+
+	(x-get-selection-internal 'PRIMARY 'LINE_NUMBER)
+	==> (SPAN . [4 4])
+
+     Right now the fact that the return type was SPAN is discarded before
+     lisp code gets to see it.
+   */
+  else if (format == 16)
+    {
+      int i;
+      Lisp_Object v = make_vector (size / 4, Qzero);
+      for (i = 0; i < size / 4; i++)
+	{
+	  int j = (int) ((unsigned short *) data) [i];
+	  Faset (v, make_int (i), make_int (j));
+	}
+      return v;
+    }
+  else
+    {
+      int i;
+      Lisp_Object v = make_vector (size / 4, Qzero);
+      for (i = 0; i < size / 4; i++)
+	{
+	  unsigned long j = ((unsigned long *) data) [i];
+	  Faset (v, make_int (i), word_to_lisp (j));
+	}
+      return v;
+    }
+}
+
+
+static void
+lisp_data_to_selection_data (struct device *d,
+			     Lisp_Object obj,
+			     unsigned char **data_ret,
+			     Atom *type_ret,
+			     unsigned int *size_ret,
+			     int *format_ret)
+{
+  Lisp_Object type = Qnil;
+
+  if (CONSP (obj) && SYMBOLP (XCAR (obj)))
+    {
+      type = XCAR (obj);
+      obj = XCDR (obj);
+      if (CONSP (obj) && NILP (XCDR (obj)))
+	obj = XCAR (obj);
+    }
+
+  if (EQ (obj, QNULL) || (EQ (type, QNULL)))
+    {				/* This is not the same as declining */
+      *format_ret = 32;
+      *size_ret = 0;
+      *data_ret = 0;
+      type = QNULL;
+    }
+  else if (STRINGP (obj))
+    {
+      Extbyte *extval;
+      Extcount extvallen;
+
+      if (NILP (type))
+	GET_STRING_CTEXT_DATA_ALLOCA (obj, extval, extvallen);
+      else
+	GET_STRING_BINARY_DATA_ALLOCA (obj, extval, extvallen);
+      *format_ret = 8;
+      *size_ret = extvallen;
+      *data_ret = (unsigned char *) xmalloc (*size_ret);
+      memcpy (*data_ret, extval, *size_ret);
+      if (NILP (type)) type = QSTRING;
+    }
+  else if (SYMBOLP (obj))
+    {
+      *format_ret = 32;
+      *size_ret = 1;
+      *data_ret = (unsigned char *) xmalloc (sizeof (Atom) + 1);
+      (*data_ret) [sizeof (Atom)] = 0;
+      (*(Atom **) data_ret) [0] = symbol_to_x_atom (d, obj, 0);
+      if (NILP (type)) type = QATOM;
+    }
+  else if (INTP (obj) &&
+	   XINT (obj) <= 0x7FFF &&
+	   XINT (obj) >= -0x8000)
+    {
+      *format_ret = 16;
+      *size_ret = 1;
+      *data_ret = (unsigned char *) xmalloc (sizeof (short) + 1);
+      (*data_ret) [sizeof (short)] = 0;
+      (*(short **) data_ret) [0] = (short) XINT (obj);
+      if (NILP (type)) type = QINTEGER;
+    }
+  else if (INTP (obj) || CONSP (obj))
+    {
+      *format_ret = 32;
+      *size_ret = 1;
+      *data_ret = (unsigned char *) xmalloc (sizeof (long) + 1);
+      (*data_ret) [sizeof (long)] = 0;
+      (*(unsigned long **) data_ret) [0] = lisp_to_word (obj);
+      if (NILP (type)) type = QINTEGER;
+    }
+  else if (VECTORP (obj))
+    {
+      /* Lisp_Vectors may represent a set of ATOMs;
+	 a set of 16 or 32 bit INTEGERs;
+	 or a set of ATOM_PAIRs (represented as [[A1 A2] [A3 A4] ...]
+       */
+      int i;
+
+      if (SYMBOLP (vector_data (XVECTOR (obj)) [0]))
+	/* This vector is an ATOM set */
+	{
+	  if (NILP (type)) type = QATOM;
+	  *size_ret = XVECTOR (obj)->size;
+	  *format_ret = 32;
+	  *data_ret = (unsigned char *) xmalloc ((*size_ret) * sizeof (Atom));
+	  for (i = 0; i < *size_ret; i++)
+	    if (SYMBOLP (vector_data (XVECTOR (obj)) [i]))
+	      (*(Atom **) data_ret) [i] =
+		symbol_to_x_atom (d, vector_data (XVECTOR (obj)) [i], 0);
+	    else
+              signal_error (Qerror, /* Qselection_error */
+                            list2 (build_string
+		   ("all elements of the vector must be of the same type"),
+                                   obj));
+	}
+#if 0 /* #### MULTIPLE doesn't work yet */
+      else if (VECTORP (vector_data (XVECTOR (obj)) [0]))
+	/* This vector is an ATOM_PAIR set */
+	{
+	  if (NILP (type)) type = QATOM_PAIR;
+	  *size_ret = XVECTOR (obj)->size;
+	  *format_ret = 32;
+	  *data_ret = (unsigned char *)
+	    xmalloc ((*size_ret) * sizeof (Atom) * 2);
+	  for (i = 0; i < *size_ret; i++)
+	    if (VECTORP (vector_data (XVECTOR (obj)) [i]))
+	      {
+		Lisp_Object pair = vector_data (XVECTOR (obj)) [i];
+		if (XVECTOR (pair)->size != 2)
+		  signal_error (Qerror,
+                                list2 (build_string 
+       ("elements of the vector must be vectors of exactly two elements"),
+				  pair));
+		
+		(*(Atom **) data_ret) [i * 2] =
+		  symbol_to_x_atom (d, vector_data (XVECTOR (pair)) [0], 0);
+		(*(Atom **) data_ret) [(i * 2) + 1] =
+		  symbol_to_x_atom (d, vector_data (XVECTOR (pair)) [1], 0);
+	      }
+	    else
+	      signal_error (Qerror,
+                            list2 (build_string
+		   ("all elements of the vector must be of the same type"),
+                                   obj));
+	}
+#endif
+      else
+	/* This vector is an INTEGER set, or something like it */
+	{
+	  *size_ret = XVECTOR (obj)->size;
+	  if (NILP (type)) type = QINTEGER;
+	  *format_ret = 16;
+	  for (i = 0; i < *size_ret; i++)
+	    if (CONSP (vector_data (XVECTOR (obj)) [i]))
+	      *format_ret = 32;
+	    else if (!INTP (vector_data (XVECTOR (obj)) [i]))
+	      signal_error (Qerror, /* Qselection_error */
+                            list2 (build_string
+	("all elements of the vector must be integers or conses of integers"),
+                                   obj));
+
+	  *data_ret = (unsigned char *) xmalloc (*size_ret * (*format_ret/8));
+	  for (i = 0; i < *size_ret; i++)
+	    if (*format_ret == 32)
+	      (*((unsigned long **) data_ret)) [i] =
+		lisp_to_word (vector_data (XVECTOR (obj)) [i]);
+	    else
+	      (*((unsigned short **) data_ret)) [i] =
+		(unsigned short) lisp_to_word (vector_data (XVECTOR (obj)) [i]);
+	}
+    }
+  else
+    signal_error (Qerror, /* Qselection_error */
+                  list2 (build_string ("unrecognized selection data"),
+                         obj));
+
+  *type_ret = symbol_to_x_atom (d, type, 0);
+}
+
+static Lisp_Object
+clean_local_selection_data (Lisp_Object obj)
+{
+  if (CONSP (obj) &&
+      INTP (XCAR (obj)) &&
+      CONSP (XCDR (obj)) &&
+      INTP (XCAR (XCDR (obj))) &&
+      NILP (XCDR (XCDR (obj))))
+    obj = Fcons (XCAR (obj), XCDR (obj));
+
+  if (CONSP (obj) &&
+      INTP (XCAR (obj)) &&
+      INTP (XCDR (obj)))
+    {
+      if (XINT (XCAR (obj)) == 0)
+	return XCDR (obj);
+      if (XINT (XCAR (obj)) == -1)
+	return make_int (- XINT (XCDR (obj)));
+    }
+  if (VECTORP (obj))
+    {
+      int i;
+      int size = XVECTOR (obj)->size;
+      Lisp_Object copy;
+      if (size == 1)
+	return clean_local_selection_data (vector_data (XVECTOR (obj)) [0]);
+      copy = make_vector (size, Qnil);
+      for (i = 0; i < size; i++)
+	vector_data (XVECTOR (copy)) [i] =
+	  clean_local_selection_data (vector_data (XVECTOR (obj)) [i]);
+      return copy;
+    }
+  return obj;
+}
+
+
+/* Called from the event loop to handle SelectionNotify events.
+   I don't think this needs to be reentrant.
+ */
+void
+x_handle_selection_notify (XSelectionEvent *event)
+{
+  if (! reading_selection_reply)
+    {
+      message ("received an unexpected SelectionNotify event");
+      return;
+    }
+  if (event->requestor != reading_selection_reply)
+    {
+      message ("received a SelectionNotify event for the wrong window");
+      return;
+    }
+  if (event->selection != reading_which_selection)
+    {
+      message ("received the wrong selection type in SelectionNotify!");
+      return;
+    }
+
+  reading_selection_reply = 0; /* we're done now. */
+}
+
+
+DEFUN ("x-own-selection-internal",
+       Fx_own_selection_internal, Sx_own_selection_internal,
+  2, 2, 0 /*
+Assert an X selection of the given TYPE with the given VALUE.
+TYPE is a symbol, typically PRIMARY, SECONDARY, or CLIPBOARD.
+VALUE is typically a string, or a cons of two markers, but may be
+anything that the functions on selection-converter-alist know about.
+*/ )
+  (selection_name, selection_value)
+     Lisp_Object selection_name, selection_value;
+{
+  CHECK_SYMBOL (selection_name);
+  if (NILP (selection_value)) error ("selection-value may not be nil.");
+  x_own_selection (selection_name, selection_value);
+  return selection_value;
+}
+
+
+/* Request the selection value from the owner.  If we are the owner,
+   simply return our selection value.  If we are not the owner, this
+   will block until all of the data has arrived.
+ */
+DEFUN ("x-get-selection-internal",
+       Fx_get_selection_internal, Sx_get_selection_internal, 2, 2, 0 /*
+Return text selected from some X window.
+SELECTION is a symbol, typically PRIMARY, SECONDARY, or CLIPBOARD.
+TYPE is the type of data desired, typically STRING.
+*/ )
+  (selection_symbol, target_type)
+     Lisp_Object selection_symbol, target_type;
+{
+  /* This function can GC */
+  Lisp_Object val = Qnil;
+  struct gcpro gcpro1, gcpro2;
+  GCPRO2 (target_type, val); /* we store newly consed data into these */
+  CHECK_SYMBOL (selection_symbol);
+
+#if 0 /* #### MULTIPLE doesn't work yet */
+  if (CONSP (target_type) &&
+      XCAR (target_type) == QMULTIPLE)
+    {
+      CHECK_VECTOR (XCDR (target_type));
+      /* So we don't destructively modify this... */
+      target_type = copy_multiple_data (target_type);
+    }
+  else
+#endif
+    CHECK_SYMBOL (target_type);
+
+  val = x_get_local_selection (selection_symbol, target_type);
+
+  if (NILP (val))
+    {
+      val = x_get_foreign_selection (selection_symbol,
+				     target_type);
+      goto DONE_LABEL;
+    }
+
+  if (CONSP (val) &&
+      SYMBOLP (XCAR (val)))
+    {
+      val = XCDR (val);
+      if (CONSP (val) && NILP (XCDR (val)))
+	val = XCAR (val);
+    }
+  val = clean_local_selection_data (val);
+ DONE_LABEL:
+  UNGCPRO;
+  return val;
+}
+
+DEFUN ("x-disown-selection-internal",
+       Fx_disown_selection_internal, Sx_disown_selection_internal, 1, 2, 0 /*
+If we own the named selection, then disown it (make there be no selection).
+*/ )
+     (selection, timeval)
+     Lisp_Object selection;
+     Lisp_Object timeval;
+{
+  struct device *d = decode_x_device (Qnil);
+  Display *display = DEVICE_X_DISPLAY (d);
+  Time timestamp;
+  Atom selection_atom;
+  XSelectionClearEvent event;
+
+  CHECK_SYMBOL (selection);
+  if (NILP (timeval))
+    timestamp = DEVICE_X_MOUSE_TIMESTAMP (d);
+  else
+    {
+      /* #### This is bogus.  See the comment above about problems
+	 on OSF/1 and DEC Alphas.  Yet another reason why it sucks
+	 to have the implementation (i.e. cons of two 16-bit
+	 integers) exposed. */
+      time_t the_time;
+      lisp_to_time (timeval, &the_time);
+      timestamp = (Time) the_time;
+    }
+
+  if (NILP (assq_no_quit (selection, Vselection_alist)))
+    return Qnil;  /* Don't disown the selection when we're not the owner. */
+
+  selection_atom = symbol_to_x_atom (d, selection, 0);
+
+  XSetSelectionOwner (display, selection_atom, None, timestamp);
+
+  /* It doesn't seem to be guaranteed that a SelectionClear event will be
+     generated for a window which owns the selection when that window sets
+     the selection owner to None.  The NCD server does, the MIT Sun4 server
+     doesn't.  So we synthesize one; this means we might get two, but
+     that's ok, because the second one won't have any effect.
+   */
+  event.display = display;
+  event.selection = selection_atom;
+  event.time = timestamp;
+  x_handle_selection_clear (&event);
+
+  return Qt;
+}
+
+
+DEFUN ("x-selection-owner-p",
+       Fx_selection_owner_p, Sx_selection_owner_p, 0, 1, 0 /*
+Whether the current emacs process owns the given X Selection.
+The arg should be the name of the selection in question, typically one of
+the symbols PRIMARY, SECONDARY, or CLIPBOARD.  (For convenience, the symbol
+nil is the same as PRIMARY, and t is the same as SECONDARY.)
+*/ )
+     (selection)
+     Lisp_Object selection;
+{
+  CHECK_SYMBOL (selection);
+  if (EQ (selection, Qnil)) selection = QPRIMARY;
+  if (EQ (selection, Qt)) selection = QSECONDARY;
+  
+  if (NILP (Fassq (selection, Vselection_alist)))
+    return Qnil;
+  return Qt;
+}
+
+DEFUN ("x-selection-exists-p",
+       Fx_selection_exists_p, Sx_selection_exists_p, 0, 1, 0 /*
+Whether there is an owner for the given X Selection.
+The arg should be the name of the selection in question, typically one of
+the symbols PRIMARY, SECONDARY, or CLIPBOARD.  (For convenience, the symbol
+nil is the same as PRIMARY, and t is the same as SECONDARY.)
+*/ )
+     (selection)
+     Lisp_Object selection;
+{
+  Window owner;
+  struct device *d = decode_x_device (Qnil);
+  Display *dpy = DEVICE_X_DISPLAY (d);
+  CHECK_SYMBOL (selection);
+  if (!NILP (Fx_selection_owner_p (selection)))
+    return Qt;
+  owner = XGetSelectionOwner (dpy, symbol_to_x_atom (d, selection, 0));
+  return (owner ? Qt : Qnil);
+}
+
+
+#ifdef CUT_BUFFER_SUPPORT
+
+static int cut_buffers_initialized; /* Whether we're sure they all exist */
+
+/* Ensure that all 8 cut buffers exist.  ICCCM says we gotta... */
+static void
+initialize_cut_buffers (Display *display, Window window)
+{
+  unsigned CONST char *data = (unsigned CONST char *) "";
+#define FROB(atom) XChangeProperty (display, window, atom, XA_STRING, 8, \
+				    PropModeAppend, data, 0)
+  FROB (XA_CUT_BUFFER0);
+  FROB (XA_CUT_BUFFER1);
+  FROB (XA_CUT_BUFFER2);
+  FROB (XA_CUT_BUFFER3);
+  FROB (XA_CUT_BUFFER4);
+  FROB (XA_CUT_BUFFER5);
+  FROB (XA_CUT_BUFFER6);
+  FROB (XA_CUT_BUFFER7);
+#undef FROB
+  cut_buffers_initialized = 1;
+}
+
+
+#define CHECK_CUTBUFFER(symbol)						\
+  { CHECK_SYMBOL (symbol);						\
+    if (!EQ((symbol),QCUT_BUFFER0) && !EQ((symbol),QCUT_BUFFER1) &&	\
+	!EQ((symbol),QCUT_BUFFER2) && !EQ((symbol),QCUT_BUFFER3) &&	\
+	!EQ((symbol),QCUT_BUFFER4) && !EQ((symbol),QCUT_BUFFER5) &&	\
+	!EQ((symbol),QCUT_BUFFER6) && !EQ((symbol),QCUT_BUFFER7))	\
+      signal_error (Qerror, list2 (build_string ("doesn't name a cutbuffer"), \
+                                   (symbol))); \
+  }
+
+DEFUN ("x-get-cutbuffer-internal", Fx_get_cutbuffer_internal,
+       Sx_get_cutbuffer_internal, 1, 1, 0 /*
+Return the value of the named cutbuffer (typically CUT_BUFFER0).
+*/ )
+     (buffer)
+     Lisp_Object buffer;
+{
+  struct device *d = decode_x_device (Qnil);
+  Display *display = DEVICE_X_DISPLAY (d);
+  Window window = RootWindow (display, 0); /* Cutbuffers are on frame 0 */
+  Atom buffer_atom;
+  unsigned char *data;
+  int bytes;
+  Atom type;
+  int format;
+  unsigned long size;
+  Lisp_Object ret;
+
+  CHECK_CUTBUFFER (buffer);
+  buffer_atom = symbol_to_x_atom (d, buffer, 0);
+
+  x_get_window_property (display, window, buffer_atom, &data, &bytes,
+			 &type, &format, &size, 0);
+  if (!data) return Qnil;
+  
+  if (format != 8 || type != XA_STRING)
+    signal_simple_error_2 ("cut buffer doesn't contain 8-bit data",
+			   x_atom_to_symbol (d, type),
+			   make_int (format));
+
+  ret = (bytes ? make_ext_string (data, bytes, FORMAT_BINARY) : Qnil);
+  xfree (data);
+  return ret;
+}
+
+
+DEFUN ("x-store-cutbuffer-internal", Fx_store_cutbuffer_internal,
+       Sx_store_cutbuffer_internal, 2, 2, 0 /*
+Sets the value of the named cutbuffer (typically CUT_BUFFER0).
+*/ )
+     (buffer, string)
+     Lisp_Object buffer, string;
+{
+  struct device *d = decode_x_device (Qnil);
+  Display *display = DEVICE_X_DISPLAY (d);
+  Window window = RootWindow (display, 0); /* Cutbuffers are on frame 0 */
+  Atom buffer_atom;
+  unsigned char *data;
+  int bytes;
+  int bytes_remaining;
+  int max_bytes = SELECTION_QUANTUM (display);
+  if (max_bytes > MAX_SELECTION_QUANTUM) max_bytes = MAX_SELECTION_QUANTUM;
+
+  CHECK_CUTBUFFER (buffer);
+  CHECK_STRING (string);
+  buffer_atom = symbol_to_x_atom (d, buffer, 0);
+  GET_STRING_BINARY_DATA_ALLOCA (string, data, bytes);
+  bytes_remaining = bytes;
+
+  if (! cut_buffers_initialized) initialize_cut_buffers (display, window);
+
+  while (bytes_remaining)
+    {
+      int chunk = (bytes_remaining < max_bytes
+		   ? bytes_remaining : max_bytes);
+      XChangeProperty (display, window, buffer_atom, XA_STRING, 8,
+		       (bytes_remaining == bytes
+			? PropModeReplace
+			: PropModeAppend),
+		       data, chunk);
+      data += chunk;
+      bytes_remaining -= chunk;
+    }
+  return string;
+}
+
+
+DEFUN ("x-rotate-cutbuffers-internal", Fx_rotate_cutbuffers_internal,
+       Sx_rotate_cutbuffers_internal, 1, 1, 0 /*
+Rotate the values of the cutbuffers by the given number of steps;
+positive means move values forward, negative means backward.
+*/ )
+     (n)
+     Lisp_Object n;
+{
+  struct device *d = decode_x_device (Qnil);
+  Display *display = DEVICE_X_DISPLAY (d);
+  Window window = RootWindow (display, 0); /* Cutbuffers are on frame 0 */
+  Atom props [8];
+
+  CHECK_INT (n);
+  if (XINT (n) == 0)
+    return n;
+  if (! cut_buffers_initialized)
+    initialize_cut_buffers (display, window);
+  props[0] = XA_CUT_BUFFER0;
+  props[1] = XA_CUT_BUFFER1;
+  props[2] = XA_CUT_BUFFER2;
+  props[3] = XA_CUT_BUFFER3;
+  props[4] = XA_CUT_BUFFER4;
+  props[5] = XA_CUT_BUFFER5;
+  props[6] = XA_CUT_BUFFER6;
+  props[7] = XA_CUT_BUFFER7;
+  XRotateWindowProperties (display, window, props, 8, XINT (n));
+  return n;
+}
+
+#endif
+
+
+/************************************************************************/
+/*                            initialization                            */
+/************************************************************************/
+
+void
+syms_of_xselect (void)
+{
+  defsubr (&Sx_get_selection_internal);
+  defsubr (&Sx_own_selection_internal);
+  defsubr (&Sx_disown_selection_internal);
+  defsubr (&Sx_selection_owner_p);
+  defsubr (&Sx_selection_exists_p);
+
+#ifdef CUT_BUFFER_SUPPORT
+  defsubr (&Sx_get_cutbuffer_internal);
+  defsubr (&Sx_store_cutbuffer_internal);
+  defsubr (&Sx_rotate_cutbuffers_internal);
+#endif
+
+  /* Unfortunately, timeout handlers must be lisp functions. */
+  defsymbol (&Qx_selection_reply_timeout_internal,
+             "x-selection-reply-timeout-internal");
+  defsubr (&Sx_selection_reply_timeout_internal);
+
+  defsymbol (&QPRIMARY, "PRIMARY");
+  defsymbol (&QSECONDARY, "SECONDARY");
+  defsymbol (&QSTRING, "STRING");
+  defsymbol (&QINTEGER, "INTEGER");
+  defsymbol (&QCLIPBOARD, "CLIPBOARD");
+  defsymbol (&QTIMESTAMP, "TIMESTAMP");
+  defsymbol (&QTEXT, "TEXT");
+  defsymbol (&QTIMESTAMP, "TIMESTAMP");
+  defsymbol (&QDELETE, "DELETE");
+  defsymbol (&QMULTIPLE, "MULTIPLE");
+  defsymbol (&QINCR, "INCR");
+  defsymbol (&QEMACS_TMP, "_EMACS_TMP_");
+  defsymbol (&QTARGETS, "TARGETS");
+  defsymbol (&QATOM, "ATOM");
+  defsymbol (&QATOM_PAIR, "ATOM_PAIR");
+  defsymbol (&QCOMPOUND_TEXT, "COMPOUND_TEXT");
+  defsymbol (&QNULL, "NULL");
+
+#ifdef EPOCH
+  defsymbol (&QARC, "ARC");
+  defsymbol (&QBITMAP, "BITMAP");
+  defsymbol (&QCARDINAL, "CARDINAL");
+  defsymbol (&QCURSOR, "CURSOR");
+  defsymbol (&QDRAWABLE, "DRAWABLE");
+  defsymbol (&QFONT, "FONT");
+  defsymbol (&QINTEGER, "INTEGER");
+  defsymbol (&QPIXMAP, "PIXMAP");
+  defsymbol (&QPOINT, "POINT");
+  defsymbol (&QRECTANGLE, "RECTANGLE");
+  defsymbol (&QWINDOW, "WINDOW");
+  defsymbol (&QWM_HINTS, "WM_HINTS");
+  defsymbol (&QWM_SIZE_HINTS, "WM_SIZE_HINTS");
+#endif /* EPOCH */
+  
+#ifdef CUT_BUFFER_SUPPORT
+  defsymbol (&QCUT_BUFFER0, "CUT_BUFFER0");
+  defsymbol (&QCUT_BUFFER1, "CUT_BUFFER1");
+  defsymbol (&QCUT_BUFFER2, "CUT_BUFFER2");
+  defsymbol (&QCUT_BUFFER3, "CUT_BUFFER3");
+  defsymbol (&QCUT_BUFFER4, "CUT_BUFFER4");
+  defsymbol (&QCUT_BUFFER5, "CUT_BUFFER5");
+  defsymbol (&QCUT_BUFFER6, "CUT_BUFFER6");
+  defsymbol (&QCUT_BUFFER7, "CUT_BUFFER7");
+#endif
+}
+
+void
+vars_of_xselect (void)
+{
+#ifdef CUT_BUFFER_SUPPORT
+  cut_buffers_initialized = 0;
+  Fprovide (intern ("cut-buffer"));
+#endif
+
+  reading_selection_reply = 0;
+  reading_which_selection = 0;
+  selection_reply_timed_out = 0;
+  for_whom_the_bell_tolls = 0;
+  prop_location_tick = 0;
+
+  Vselection_alist = Qnil;
+  staticpro (&Vselection_alist);
+
+  DEFVAR_LISP ("selection-converter-alist", &Vselection_converter_alist /*
+An alist associating selection-types (such as STRING and TIMESTAMP) with
+functions.  These functions will be called with three args: the name of the
+selection (typically PRIMARY, SECONDARY, or CLIPBOARD); a desired type to
+which the selection should be converted; and the local selection value
+ (whatever had been passed to `x-own-selection').  These functions should
+return the value to send to the X server, which should be one of:
+
+-- nil (the conversion could not be done)
+-- a cons of a symbol and any of the following values; the symbol
+   explicitly specifies the type that will be sent.
+-- a string (Will be left as is and sent in the 'STRING format as 8-bit data.)
+-- a character (Same as for strings.)
+-- the symbol 'NULL (Indicates that there is no meaningful return value.
+                     Empty 32-bit data with a type of 'NULL will be sent.)
+-- a symbol (Will be converted into an atom.  If the type is not specified,
+             a type of 'ATOM will be sent.)
+-- an integer (Will be converted into a 16-bit or 32-bit integer depending
+               on the value.  If the type is not specified, a type of
+	       'INTEGER will be sent.)
+-- a cons (HIGH . LOW) of integers (Will be converted into a 32-bit integer.
+                                    If the type is not specified, a type of
+				    'INTEGER will be sent.)
+-- a vector of symbols (Will be converted into a list of atoms.  If the type
+                        is not specified, a type of 'ATOM will be sent.)
+-- a vector of integers (Will be converted into a list of 16-bit integers.
+                         If the type is not specified, a type of 'INTEGER
+			 will be sent.)
+-- a vector of integers and/or conses (HIGH . LOW) of integers
+                        (Will be converted into a list of 16-bit integers.
+                         If the type is not specified, a type of 'INTEGER
+			 will be sent.)
+*/ );
+  Vselection_converter_alist = Qnil;
+
+  DEFVAR_LISP ("x-lost-selection-hooks", &Vx_lost_selection_hooks /*
+A function or functions to be called after the X server has notified us
+that we have lost the selection.  The function(s) will be called with one
+argument, a symbol naming the selection (typically PRIMARY, SECONDARY, or
+CLIPBOARD).
+*/ );
+  Vx_lost_selection_hooks = Qunbound;
+
+  DEFVAR_LISP ("x-sent-selection-hooks", &Vx_sent_selection_hooks /*
+A function or functions to be called after we have responded to some
+other client's request for the value of a selection that we own.  The
+function(s) will be called with four arguments:
+  - the name of the selection (typically PRIMARY, SECONDARY, or CLIPBOARD);
+  - the name of the selection-type which we were requested to convert the
+    selection into before sending (for example, STRING or LENGTH);
+  - and whether we successfully transmitted the selection.
+We might have failed (and declined the request) for any number of reasons,
+including being asked for a selection that we no longer own, or being asked
+to convert into a type that we don't know about or that is inappropriate.
+This hook doesn't let you change the behavior of emacs's selection replies,
+it merely informs you that they have happened.
+*/ );
+  Vx_sent_selection_hooks = Qunbound;
+
+  DEFVAR_INT ("x-selection-timeout", &x_selection_timeout /*
+If the selection owner doesn't reply in this many seconds, we give up.
+A value of 0 means wait as long as necessary.  This is initialized from the
+\"*selectionTimeout\" resource (which is expressed in milliseconds).
+*/ );
+  x_selection_timeout = 0;
+}
+
+void
+Xatoms_of_xselect (struct device *d)
+{
+#define ATOM(x) XInternAtom (DEVICE_X_DISPLAY (d), (x), False)
+
+  /* Non-predefined atoms that we might end up using a lot */
+  DEVICE_XATOM_CLIPBOARD (d) =		ATOM ("CLIPBOARD");
+  DEVICE_XATOM_TIMESTAMP (d) =		ATOM ("TIMESTAMP");
+  DEVICE_XATOM_TEXT (d) =		ATOM ("TEXT");
+  DEVICE_XATOM_DELETE (d) =		ATOM ("DELETE");
+  DEVICE_XATOM_MULTIPLE (d) =		ATOM ("MULTIPLE");
+  DEVICE_XATOM_INCR (d) =		ATOM ("INCR");
+  DEVICE_XATOM_EMACS_TMP (d) =		ATOM ("_EMACS_TMP_");
+  DEVICE_XATOM_TARGETS (d) =		ATOM ("TARGETS");
+  DEVICE_XATOM_NULL (d) =		ATOM ("NULL");
+  DEVICE_XATOM_ATOM_PAIR (d) =		ATOM ("ATOM_PAIR");
+  DEVICE_XATOM_COMPOUND_TEXT (d) =	ATOM ("COMPOUND_TEXT");
+}