/usr/include/gtk-2.0/gdk/gdkproperty.h is in libgtk2.0-dev 2.24.10-0ubuntu6.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128  | /* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
 */
#if defined(GTK_DISABLE_SINGLE_INCLUDES) && !defined (__GDK_H_INSIDE__) && !defined (GDK_COMPILATION)
#error "Only <gdk/gdk.h> can be included directly."
#endif
#ifndef __GDK_PROPERTY_H__
#define __GDK_PROPERTY_H__
#include <gdk/gdktypes.h>
G_BEGIN_DECLS
typedef enum
{
  GDK_PROP_MODE_REPLACE,
  GDK_PROP_MODE_PREPEND,
  GDK_PROP_MODE_APPEND
} GdkPropMode;
GdkAtom gdk_atom_intern (const gchar *atom_name,
			 gboolean     only_if_exists);
GdkAtom gdk_atom_intern_static_string (const gchar *atom_name);
gchar*  gdk_atom_name   (GdkAtom      atom);
gboolean gdk_property_get    (GdkWindow     *window,
			      GdkAtom        property,
			      GdkAtom        type,
			      gulong         offset,
			      gulong         length,
			      gint           pdelete,
			      GdkAtom       *actual_property_type,
			      gint          *actual_format,
			      gint          *actual_length,
			      guchar       **data);
void     gdk_property_change (GdkWindow     *window,
			      GdkAtom        property,
			      GdkAtom        type,
			      gint           format,
			      GdkPropMode    mode,
			      const guchar  *data,
			      gint           nelements);
void     gdk_property_delete (GdkWindow     *window,
			      GdkAtom        property);
#ifndef GDK_MULTIHEAD_SAFE
#ifndef GDK_DISABLE_DEPRECATED
gint gdk_text_property_to_text_list (GdkAtom        encoding,
				     gint           format,
				     const guchar  *text,
				     gint           length,
				     gchar       ***list);
gboolean gdk_utf8_to_compound_text (const gchar *str,
				    GdkAtom     *encoding,
				    gint        *format,
				    guchar     **ctext,
				    gint        *length);
gint gdk_string_to_compound_text    (const gchar   *str,
				     GdkAtom       *encoding,
				     gint          *format,
				     guchar       **ctext,
				     gint          *length);
gint gdk_text_property_to_utf8_list (GdkAtom        encoding,
				     gint           format,
				     const guchar  *text,
				     gint           length,
				     gchar       ***list);
#endif
#endif
gint gdk_text_property_to_utf8_list_for_display (GdkDisplay     *display,
						 GdkAtom         encoding,
						 gint            format,
						 const guchar   *text,
						 gint            length,
						 gchar        ***list);
gchar   *gdk_utf8_to_string_target   (const gchar *str);
#ifndef GDK_DISABLE_DEPRECATED
gint gdk_text_property_to_text_list_for_display (GdkDisplay     *display,
						 GdkAtom         encoding,
						 gint            format,
						 const guchar   *text,
						 gint            length,
						 gchar        ***list);
gint     gdk_string_to_compound_text_for_display (GdkDisplay   *display,
						  const gchar  *str,
						  GdkAtom      *encoding,
						  gint         *format,
						  guchar      **ctext,
						  gint         *length);
gboolean gdk_utf8_to_compound_text_for_display   (GdkDisplay   *display,
						  const gchar  *str,
						  GdkAtom      *encoding,
						  gint         *format,
						  guchar      **ctext,
						  gint         *length);
void gdk_free_text_list             (gchar        **list);
void gdk_free_compound_text         (guchar        *ctext);
#endif
G_END_DECLS
#endif /* __GDK_PROPERTY_H__ */
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