Merge from trunk after cygw32 commit, and resolve conflicts.

38 files changed, 1444 insertions, 558 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index cb2aab2166c..30db50fbcc8 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,170 @@
+2012-10-08  Eli Zaretskii  <eliz@gnu.org>
+
+        * makefile.w32-in (FONT_H): Add $(FRAME_H).
+        (W32TERM_H): Add $(ATIMER_H) and $(FRAME_H).
+        ($(BLD)/emacs.$(O), $(BLD)/w32console.$(O)): Update dependencies.
+        (GLOBAL_SOURCES): Add cygw32.c.
+
+        * w32fns.c (w32_color_map_lookup, x_to_w32_color): Argument is now
+        'const char *'.
+        (x_to_w32_color): Don't modify the argument, modify a copy instead.
+
+2012-10-08  Daniel Colascione  <dancol@dancol.org>
+
+        * image.c: Permanent fix for JPEG compilation issue --- limit
+        jpeglib `boolean' redefinition to Cygwin builds.
+
+2012-10-08  Eli Zaretskii  <eliz@gnu.org>
+
+        * image.c (CHECK_LIB_AVAILABLE): Remove, no longer used.
+
+        * emacs.c (DAEMON_MUST_EXEC) [HAVE_NTGUI]: Define this only on
+        Cygwin.
+
+2012-10-08  Daniel Colascione  <dancol@dancol.org>
+
+        * xfaces.c, xdisp.c, window.c, w32xfns.c, w32term.h, w32term.c,
+        w32select.h w32select.c, w32proc.c, w32menu.c, w32inevt.c,
+        w32help.c, w32font.c, w32font.c, w32fns.c, w32console.c, w32.h,
+        w32.c, unexw32.c, termhooks.h, process.c, menu.c, keyboard.h,
+        keyboard.c, image.c, frame.h, frame.c, fontset.c, font.h, font.c,
+        emacs.c, dispextern.h, cygw32.h, cygw32.c, conf_post.h,
+        Makefile.in: use HAVE_NTGUI for W32 GUI and WINDOWSNT for the
+        operating system.  defined(HAVE_NTGUI) && !defined(WINDOWSNT) is
+        now a supported configuration.
+
+        * Makefile.in: consolidate image variables into LIBIMAGE; add
+        W32_OBJ and W32_LIBS. Compile new files.
+
+        * conf_post.h:
+        (_DebPrint) declare tracing facility for W32 debugging.  We need
+        to unify tracing later.
+
+        (NTGUI_UNICODE) Define when compiling for Cygwin to allow the
+        unconditional use of W32 Unicode functions.  Cygwin runs only on
+        100% Unicode operating systems.
+
+        * cygw32.c: New file.  Define Cygwin-specific facilities.
+        (Fcygwin_convert_path_to_windows)
+        (Fcygwin_convert_path_from_windows): New user functions for
+        accessing Cygwin path-munging routines.
+
+        * cygw32.h: New file.
+        (WCSDATA, to_unicode, from_unicode): Define facilities for storing
+        UTF-16LE strings temporarily inside non-Lisp-visible string
+        objects.
+
+        (w32_strerror): Just what it says on the tin.
+
+        * emacs.c: Make the NS fork-then-exec code for daemon-launching
+        also run for Cygwin; both systems have the same problem with using
+        GUI facilities in a forked child.  Also call syms_of_cygw32,
+        syms_of_w32select in correct places.
+
+        (DAEMON_MUST_EXEC): new macro defined to signal that a platform
+        needs fork-then-exec for daemon launching.
+
+        * font.h: Include frame.h.
+
+        * image.c: Use the image library cache machinery only when we're
+        compiling for native WINDOWSNT; Cygwin can use shared libraries
+        like any other Unixlike system.
+
+        * keyboard.c: Clarify a comment regarding the input loop.
+
+        * menu.c: When NTGUI_UNICODE is defined, use Unicode menu
+        functions directly instead of trying to detect at runtime that our
+        host operating system supports them.  We make this change for two
+        reasons: Cygwin lacks support for the multibyte character
+        conversion functions used by the legacy menu code, and Cygwin
+        never needs to rely on non-Unicode APIs.
+
+        * unexw32.c (hinst): Declare extern.
+
+        * w32.c: Change header order;
+        (w32_strerror): Move to w32fns.c because we need it for
+        non-WINDOWSNT builds.
+
+        * w32.h: Add #error macro to make sure we don't include w32.h for
+        Cygwin builds.  Remove w32select declarations.
+
+        * w32console.c (w32_sys_ring_bell, Fset_message_beep): Move to
+        w32fns.c. w32console.c is WINDOWSNT-only.
+
+        * w32fns.c: Include cygw32.h or w32.h depending on CYGWIN; more
+        NTGUI_UNICODE tweaks.  (See above.) Change _snprintf to the more
+        POSIXy alternative.
+        (faked_key, sysinfo_cache, osinfo_cahce, syspage_mask)
+        (w32_major_version, w32_minor_version, w32_build_number)
+        (os_subtype, sound_type): Define here
+        (w32_defined_color): Make color parameter const for consistency
+        with other _defined_color functions.
+        (w32_createwindow): Unconditionally call w32_init_class instead of
+        doing so only when hprevinst is non-NULL.  Plumbing hprevinst
+        through the code is complex and unnecessary because class
+        registration is practically free.
+        (w32_name_of_message): New EMACSDEBUG-only function.
+        (Fset_message_beep): Move here
+        (Fx_open_connection): Require that the display name for Windows be
+        "w32" for consistency, emacsclient disambiguation, and maybe, one
+        day, multi-window-system support.
+        (file_dialog_callback): NTGUI_UNICODE changes; encode and decode
+        Cygwin files for W32 GUI facilities, since these clearly don't
+        expect Cygwin names.
+        (_DebPrint): Define.
+        (w32_strerror, w32_console_toggle_lock_key, w32_kbd_mods_to_emacs)
+        (w32_kbd_patch_key, w32_sys_ring_bell): Move here.
+        (Ssystem_move_file_to_trash): Define only for native WINDOWSNT.
+        (w32_last_error): Remove.
+
+        * w32font.c: Define _strlwr to strlwr for non-WINDOWSNT builds.
+
+        * w32heap.c (syspage_mask): Declare here.
+        (cache_system_info): Remove.
+
+        * w32inevt.c (faked_key): Define globally, not statically.
+        (w32_kbd_mods_to_emacs, w32_kbd_patch_key, faked_key)
+        (w32_console_toggle_lock_key): Move to w32fns.c.
+
+        * w32menu.c: Include setjmp.h.  NTGUI_UNICODE changes throughout.
+
+        * w32proc.c (_DebPrint): Move to w32fns.c.
+        * w32select.c: Include string.h, stdio.h for Cygwin.
+        * w32select.h: New File.
+
+        * w32term.c: Include io.h for non-CYGWIN builds; needed for
+        get_osfhandle.
+        (w32_message_fd): New variable.  Under Cygwin, holds the file
+        descriptor the system used to tell us about pending thread
+        messages.
+
+        (w32_init_term): Remove incorrect calls to fcntl and init_sigio
+        that prevented compilation under non-WINDOWSNT systems.
+
+        (w32_initialize): Open /dev/windows and assign it to
+        w32_message_fd.  Provide w32 feature.
+
+        * w32term.h: Include frame.h, atimer.h.  Declare various frame functions.
+        (WM_EMACS_INPUT_READY): add.
+        (prepend_msg, w32_message_fd): Declare globally.
+
+        * w32xfns.c:
+        (keyboard_handle): Use only when WINDOWSNT.
+        (notify_msg_ready): New function.  Posts a message to the main
+        thread's message queue under CYGWIN, which wakes up the main
+        thread from select(2) by making the /dev/windows file descriptor
+        ready.  Under WINDOWSNT, it sets an event the same way the old
+        code did.
+
+        (post, prepend_msg): Actually call notify_msg_ready instead of
+        setting the input event directly.
+
+2012-10-07  Eli Zaretskii  <eliz@gnu.org>
+
+        * ralloc.c (relinquish): If a heap is ready to be relinquished,
+        but it still has blocs in it, don't return it to the system,
+        instead of aborting.  (Bug#12402)
+
 2012-10-07  Eli Zaretskii  <eliz@gnu.org>
 
         * w32term.h (WM_EMACS_FILENOTIFY): New custom message.
@@ -34,11 +201,12 @@
 
 2012-10-07  Jan Djärv  <jan.h.d@swipnet.se>
 
-        * nsterm.m (ns_dumpglyphs_image): Only draw slize of image (Bug#12506).
+        * nsterm.m (ns_dumpglyphs_image): Only draw slice of image (Bug#12506).
 
         * nsterm.m (ns_update_auto_hide_menu_bar): Remove defintion of
         MAC_OS_X_VERSION_10_6.
-        (syms_of_nsterm): Remove comment about Panther and above for ns-antialias-text.
+        (syms_of_nsterm): Remove comment about Panther and above for
+        ns-antialias-text.
         * nsterm.h (MAC_OS_X_VERSION_10_3, onTiger): Remove.
         (EmacsApp): Remove check for >= MAC_OS_X_VERSION_10_4.
         (struct nsfont_info): Remove check for >= MAC_OS_X_VERSION_10_3.
@@ -46,7 +214,8 @@
         * nsselect.m (ns_string_from_pasteboard): Remove check for >=
         MAC_OS_X_VERSION_10_4.
 
-        * nsmenu.m (fillWithWidgetValue:): Remove code for < MAC_OS_X_VERSION_10_2.
+        * nsmenu.m (fillWithWidgetValue:): Remove code for <
+        MAC_OS_X_VERSION_10_2.
 
         * nsimage.m (setPixmapData, getPixelAtX, setAlphaAtX): Remove onTiger.
 
@@ -55,13 +224,13 @@
 
         * nsterm.m (ns_in_resize): Remove (Bug#12479).
         (ns_resize_handle_rect, mouseDown, mouseUp, mouseDragged): Remove.
-        (ns_clear_frame, sendEvent, windowDidResize, drawRect:): Remove ns_in_resize
-        check.
+        (ns_clear_frame, sendEvent, windowDidResize, drawRect:): Remove
+        ns_in_resize check.
         (ns_clear_frame_area): Remove resize handle code.
 
         * nsfns.m (ns_in_resize): Remove.
-        (x_set_icon_name, ns_set_name, ns_set_name_as_filename):  Remove ns_in_resize
-        check.
+        (x_set_icon_name, ns_set_name, ns_set_name_as_filename):  Remove
+        ns_in_resize check.
 
 2012-10-07  Paul Eggert  <eggert@cs.ucla.edu>
 
diff --git a/src/Makefile.in b/src/Makefile.in
index f8da0091711..e704f2f5c0c 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -135,13 +135,10 @@ LIB_MATH=@LIB_MATH@
 ## -lpthreads, or empty.
 LIB_PTHREAD=@LIB_PTHREAD@
 
-LIBTIFF=@LIBTIFF@
-LIBJPEG=@LIBJPEG@
-LIBPNG=@LIBPNG@
-LIBGIF=@LIBGIF@
-LIBXPM=@LIBXPM@
+LIBIMAGE=@LIBTIFF@ @LIBJPEG@ @LIBPNG@ @LIBGIF@ @LIBXPM@
+
 XFT_LIBS=@XFT_LIBS@
-LIBX_EXTRA=$(LIBTIFF) $(LIBJPEG) $(LIBPNG) $(LIBGIF) $(LIBXPM) -lX11 $(XFT_LIBS)
+LIBX_EXTRA=-lX11 $(XFT_LIBS)
 
 FONTCONFIG_CFLAGS = @FONTCONFIG_CFLAGS@
 FONTCONFIG_LIBS = @FONTCONFIG_LIBS@
@@ -261,6 +258,13 @@ NS_OBJ=@NS_OBJ@
 NS_OBJC_OBJ=@NS_OBJC_OBJ@
 ## Only set if NS_IMPL_GNUSTEP.
 GNU_OBJC_CFLAGS=@GNU_OBJC_CFLAGS@
+## w32fns.o w32menu.c w32reg.o fringe.o fontset.o w32font.o w32term.o
+## w32xfns.o w32select.o image.o w32uniscribe.o if HAVE_W32, else
+## empty.
+W32_OBJ=@W32_OBJ@
+## -lkernel32 -luser32 -lgdi32 -lole32 -lcomdlg32 lusp10 -lcomctl32
+## --lwinspool if HAVE_W32, else empty.
+W32_LIBS=@W32_LIBS@
 
 ## Empty if !HAVE_X_WINDOWS
 ## xfont.o ftfont.o xftfont.o ftxfont.o if HAVE_XFT
@@ -342,7 +346,7 @@ base_obj = dispnew.o frame.o scroll.o xdisp.o menu.o $(XMENU_OBJ) window.o \
         doprnt.o intervals.o textprop.o composite.o xml.o \
         profiler.o \
         $(MSDOS_OBJ) $(MSDOS_X_OBJ) $(NS_OBJ) $(CYGWIN_OBJ) $(FONT_OBJ) \
-        $(WINDOW_SYSTEM_OBJ)
+        $(W32_OBJ) $(WINDOW_SYSTEM_OBJ)
 obj = $(base_obj) $(NS_OBJC_OBJ)
 
 ## Object files used on some machine or other.
@@ -351,9 +355,9 @@ obj = $(base_obj) $(NS_OBJC_OBJ)
 ## in the list, in case they ever add any such entries.
 SOME_MACHINE_OBJECTS = dosfns.o msdos.o \
   xterm.o xfns.o xmenu.o xselect.o xrdb.o xsmfns.o fringe.o image.o \
-  fontset.o dbusbind.o \
+  fontset.o dbusbind.o cygw32.o \
   nsterm.o nsfns.o nsmenu.o nsselect.o nsimage.o nsfont.o \
-  w32.o w32console.o w32fns.o w32heap.o w32inevt.o \
+  w32.o w32console.o w32fns.o w32heap.o \
   w32menu.o w32proc.o w32reg.o w32select.o w32term.o w32xfns.o \
   w16select.o widget.o xfont.o ftfont.o xftfont.o ftxfont.o gtkutil.o \
   xsettings.o xgselect.o termcap.o
@@ -385,9 +389,11 @@ otherobj= $(TERMCAP_OBJ) $(PRE_ALLOC_OBJ) $(GMALLOC_OBJ) $(RALLOC_OBJ) \
 ## Note that SunOS needs -lm to come before -lc; otherwise, you get
 ## duplicated symbols.  If the standard libraries were compiled
 ## with GCC, we might need LIB_GCC again after them.
-LIBES = $(LIBS) $(LIBX_BASE) $(LIBX_OTHER) $(LIBSOUND) \
-   $(RSVG_LIBS) $(IMAGEMAGICK_LIBS) $(LIB_CLOCK_GETTIME) $(LIB_TIMER_TIME) \
-   $(DBUS_LIBS) $(LIB_EXECINFO) \
+LIBES = $(LIBS) $(W32_LIBS) $(LIBX_BASE) $(LIBIMAGE) \
+   $(LIBX_OTHER) $(LIBSOUND) \
+   $(RSVG_LIBS) $(IMAGEMAGICK_LIBS) $(LIB_CLOCK_GETTIME) \
+   $(LIB_TIMER_TIME) $(DBUS_LIBS) \
+   $(LIB_EXECINFO) \
    $(LIBXML2_LIBS) $(LIBGPM) $(LIBRESOLV) $(LIBS_SYSTEM) \
    $(LIBS_TERMCAP) $(GETLOADAVG_LIBS) $(SETTINGS_LIBS) $(LIBSELINUX_LIBS) \
    $(FREETYPE_LIBS) $(FONTCONFIG_LIBS) $(LIBOTF_LIBS) $(M17N_FLT_LIBS) \
diff --git a/src/conf_post.h b/src/conf_post.h
index 0c4d029bc5d..53fc941f464 100644
--- a/src/conf_post.h
+++ b/src/conf_post.h
@@ -142,6 +142,20 @@ You lose; /* Emacs for DOS must be compiled with DJGPP */
 #endif
 #endif
 
+#if defined(HAVE_NTGUI) && !defined(DebPrint)
+# if defined(EMACSDEBUG)
+extern void _DebPrint (const char *fmt, ...);
+#  define DebPrint(stuff) _DebPrint stuff
+# else
+#  define DebPrint(stuff)
+# endif /* EMACSDEBUG */
+#endif /* DebPrint */
+
+#if defined(CYGWIN) && defined(HAVE_NTGUI)
+#define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
+#define _WIN32_WINNT 0x500 /* Win2k */
+#endif /* CYGWIN && HAVE_NTGUI */
+
 #ifdef emacs /* Don't do this for lib-src.  */
 /* Tell regex.c to use a type compatible with Emacs.  */
 #define RE_TRANSLATE_TYPE Lisp_Object
diff --git a/src/cygw32.c b/src/cygw32.c
new file mode 100644
index 00000000000..ab7ee91a138
--- /dev/null
+++ b/src/cygw32.c
@@ -0,0 +1,169 @@
+/* Cygwin support routines.
+   Copyright (C) 2011-2012  Free Software Foundation, Inc.
+
+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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.  */
+
+
+#include "cygw32.h"
+#include "character.h"
+#include "buffer.h"
+#include <unistd.h>
+#include <fcntl.h>
+static Lisp_Object Qutf_16_le;
+
+static Lisp_Object
+fchdir_unwind (Lisp_Object dir_fd)
+{
+  (void) fchdir (XFASTINT (dir_fd));
+  (void) close (XFASTINT (dir_fd));
+  return Qnil;
+}
+
+static void
+chdir_to_default_directory ()
+{
+  Lisp_Object new_cwd;
+  int old_cwd_fd = open (".", O_RDONLY | O_DIRECTORY);
+
+  if (old_cwd_fd == -1)
+    error ("could not open current directory: %s", strerror (errno));
+
+  record_unwind_protect (fchdir_unwind, make_number (old_cwd_fd));
+
+  new_cwd = Funhandled_file_name_directory (
+    Fexpand_file_name (build_string ("."), Qnil));
+  if (!STRINGP (new_cwd))
+    new_cwd = build_string ("/");
+
+  if (chdir (SDATA (ENCODE_FILE (new_cwd))))
+    error ("could not chdir: %s", strerror (errno));
+}
+
+static Lisp_Object
+conv_filename_to_w32_unicode (Lisp_Object in, int absolute_p)
+{
+  ssize_t converted_len;
+  Lisp_Object converted;
+  unsigned flags;
+  int count = SPECPDL_INDEX ();
+
+  chdir_to_default_directory ();
+
+  flags = CCP_POSIX_TO_WIN_W;
+  if (!absolute_p) {
+    flags |= CCP_RELATIVE;
+  }
+
+  in = ENCODE_FILE (in);
+
+  converted_len = cygwin_conv_path (flags, SDATA (in), NULL, 0);
+  if (converted_len < 2)
+    error ("cygwin_conv_path: %s", strerror (errno));
+
+  converted = make_uninit_string (converted_len - 1);
+  if (cygwin_conv_path (flags, SDATA (in),
+                        SDATA (converted), converted_len))
+    error ("cygwin_conv_path: %s", strerror (errno));
+
+  return unbind_to (count, converted);
+}
+
+static Lisp_Object
+conv_filename_from_w32_unicode (const wchar_t* in, int absolute_p)
+{
+  ssize_t converted_len;
+  Lisp_Object converted;
+  unsigned flags;
+  int count = SPECPDL_INDEX ();
+
+  chdir_to_default_directory ();
+
+  flags = CCP_WIN_W_TO_POSIX;
+  if (!absolute_p) {
+    flags |= CCP_RELATIVE;
+  }
+
+  converted_len = cygwin_conv_path (flags, in, NULL, 0);
+  if (converted_len < 1)
+    error ("cygwin_conv_path: %s", strerror (errno));
+
+  converted = make_uninit_string (converted_len - 1 /*subtract terminator*/);
+  if (cygwin_conv_path (flags, in, SDATA (converted), converted_len))
+    error ("cygwin_conv_path: %s", strerror (errno));
+
+  return unbind_to (count, DECODE_FILE (converted));
+}
+
+Lisp_Object
+from_unicode (Lisp_Object str)
+{
+  CHECK_STRING (str);
+  if (!STRING_MULTIBYTE (str) &&
+      SBYTES (str) & 1)
+    {
+      str = Fsubstring (str, make_number (0), make_number (-1));
+    }
+
+  return code_convert_string_norecord (str, Qutf_16_le, 0);
+}
+
+wchar_t *
+to_unicode (Lisp_Object str, Lisp_Object *buf)
+{
+  *buf = code_convert_string_norecord (str, Qutf_16_le, 1);
+  /* We need to make a another copy (in addition to the one made by
+     code_convert_string_norecord) to ensure that the final string is
+     _doubly_ zero terminated --- that is, that the string is
+     terminated by two zero bytes and one utf-16le null character.
+     Because strings are already terminated with a single zero byte,
+     we just add one additional zero. */
+  str = make_uninit_string (SBYTES (*buf) + 1);
+  memcpy (SDATA (str), SDATA (*buf), SBYTES (*buf));
+  SDATA (str) [SBYTES (*buf)] = '\0';
+  *buf = str;
+  return WCSDATA (*buf);
+}
+
+DEFUN ("cygwin-convert-path-to-windows",
+       Fcygwin_convert_path_to_windows, Scygwin_convert_path_to_windows,
+       1, 2, 0,
+       doc: /* Convert PATH to a Windows path.  If ABSOLUTE-P if
+               non-nil, return an absolute path.*/)
+  (Lisp_Object path, Lisp_Object absolute_p)
+{
+  return from_unicode (
+    conv_filename_to_w32_unicode (path, absolute_p == Qnil ? 0 : 1));
+}
+
+DEFUN ("cygwin-convert-path-from-windows",
+       Fcygwin_convert_path_from_windows, Scygwin_convert_path_from_windows,
+       1, 2, 0,
+       doc: /* Convert a Windows path to a Cygwin path.  If ABSOLUTE-P
+               if non-nil, return an absolute path.*/)
+  (Lisp_Object path, Lisp_Object absolute_p)
+{
+  return conv_filename_from_w32_unicode (to_unicode (path, &path),
+                                         absolute_p == Qnil ? 0 : 1);
+}
+
+void
+syms_of_cygw32 (void)
+{
+  /* No, not utf-16-le: that one has a BOM.  */
+  DEFSYM (Qutf_16_le, "utf-16le");
+  defsubr (&Scygwin_convert_path_from_windows);
+  defsubr (&Scygwin_convert_path_to_windows);
+}
diff --git a/src/cygw32.h b/src/cygw32.h
new file mode 100644
index 00000000000..22b6f5692da
--- /dev/null
+++ b/src/cygw32.h
@@ -0,0 +1,58 @@
+/* Header for Cygwin support routines.
+   Copyright (C) 2011-2012  Free Software Foundation, Inc.
+
+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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef CYGW32_H
+#define CYGW32_H
+#include <config.h>
+#include <windef.h>
+#include <sys/cygwin.h>
+#include <wchar.h>
+
+#include <signal.h>
+#include <stdio.h>
+#include <limits.h>
+#include <errno.h>
+#include <math.h>
+#include <setjmp.h>
+
+#include "lisp.h"
+#include "coding.h"
+
+/* *** Character conversion *** */
+
+/* Access the wide-character string stored in a Lisp string object.  */
+#define WCSDATA(x) ((wchar_t *) SDATA (x))
+
+/* Convert the multi-byte string in STR to UTF-16LE encoded unibyte
+   string, and store it in *BUF.  BUF may safely point to STR on entry.  */
+extern wchar_t *to_unicode (Lisp_Object str, Lisp_Object *buf);
+
+/* Convert STR, a UTF-16LE encoded string embedded in a unibyte string
+   object, to a multi-byte Emacs string, and return it.  */
+extern Lisp_Object from_unicode (Lisp_Object str);
+
+/* *** Path conversion. *** */
+
+EXFUN (Fcygwin_convert_path_to_windows, 2);
+EXFUN (Fcygwin_convert_path_from_windows, 2);
+
+/* *** Misc *** */
+extern void syms_of_cygw32 (void);
+extern char * w32_strerror (int error_no);
+
+#endif /* CYGW32_H */
diff --git a/src/dispextern.h b/src/dispextern.h
index f1ea8e97ee8..c5ebb808b05 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -3144,7 +3144,7 @@ int draw_window_fringes (struct window *, int);
 int update_window_fringes (struct window *, int);
 void compute_fringe_widths (struct frame *, int);
 
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
 void w32_init_fringe (struct redisplay_interface *);
 void w32_reset_fringes (void);
 #endif
@@ -3247,7 +3247,7 @@ extern char unspecified_fg[], unspecified_bg[];
 #ifdef HAVE_X_WINDOWS
 void gamma_correct (struct frame *, XColor *);
 #endif
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
 void gamma_correct (struct frame *, COLORREF *);
 #endif
 
diff --git a/src/emacs.c b/src/emacs.c
index 65ee11fb261..2e3c880fb53 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -33,9 +33,20 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #ifdef WINDOWSNT
 #include <fcntl.h>
-#include <windows.h> /* just for w32.h */
 #include "w32.h"
-#include "w32heap.h" /* for prototype of sbrk */
+#endif
+
+#if defined (WINDOWSNT)
+#include "w32heap.h"
+#endif
+
+#if defined (WINDOWSNT) || defined (HAVE_NTGUI)
+#include "w32select.h"
+#include "w32font.h"
+#endif
+
+#if defined (HAVE_NTGUI) && defined (CYGWIN)
+#include "cygw32.h"
 #endif
 
 #ifdef HAVE_WINDOW_SYSTEM
@@ -156,6 +167,22 @@ static void *my_heap_start;
 static uprintmax_t heap_bss_diff;
 #endif
 
+/* To run as a daemon under Cocoa or Windows, we must do a fork+exec,
+   not a simple fork.
+
+   On Cocoa, CoreFoundation lib fails in forked process:
+   http://developer.apple.com/ReleaseNotes/
+   CoreFoundation/CoreFoundation.html)
+
+   On Windows, a Cygwin fork child cannot access the USER subsystem.
+
+   We mark being in the exec'd process by a daemon name argument of
+   form "--daemon=\nFD0,FD1\nNAME" where FD are the pipe file descriptors,
+   NAME is the original daemon name, if any. */
+#if defined (NS_IMPL_COCOA) || (defined (HAVE_NTGUI) && defined (CYGWIN))
+# define DAEMON_MUST_EXEC
+#endif
+
 /* True means running Emacs without interactive terminal.  */
 bool noninteractive;
 
@@ -669,9 +696,9 @@ main (int argc, char **argv)
   bool no_loadup = 0;
   char *junk = 0;
   char *dname_arg = 0;
-#ifdef NS_IMPL_COCOA
+#ifdef DAEMON_MUST_EXEC
   char dname_arg2[80];
-#endif
+#endif /* DAEMON_MUST_EXEC */
   char *ch_to_dir;
 
 #if GC_MARK_STACK
@@ -964,25 +991,19 @@ main (int argc, char **argv)
           exit (1);
         }
 
-#ifndef NS_IMPL_COCOA
+#ifndef DAEMON_MUST_EXEC
 #ifdef USE_GTK
       fprintf (stderr, "\nWarning: due to a long standing Gtk+ bug\nhttp://bugzilla.gnome.org/show_bug.cgi?id=85715\n\
 Emacs might crash when run in daemon mode and the X11 connection is unexpectedly lost.\n\
 Using an Emacs configured with --with-x-toolkit=lucid does not have this problem.\n");
-#endif
+#endif /* USE_GTK */
       f = fork ();
-#else /* NS_IMPL_COCOA */
-      /* Under Cocoa we must do fork+exec as CoreFoundation lib fails in
-         forked process: http://developer.apple.com/ReleaseNotes/
-                                  CoreFoundation/CoreFoundation.html)
-         We mark being in the exec'd process by a daemon name argument of
-         form "--daemon=\nFD0,FD1\nNAME" where FD are the pipe file descriptors,
-         NAME is the original daemon name, if any. */
+#else /* DAEMON_MUST_EXEC */
       if (!dname_arg || !strchr (dname_arg, '\n'))
           f = fork ();  /* in orig */
       else
           f = 0;  /* in exec'd */
-#endif /* NS_IMPL_COCOA */
+#endif /* !DAEMON_MUST_EXEC */
       if (f > 0)
         {
           int retval;
@@ -1018,7 +1039,7 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
           exit (1);
         }
 
-#ifdef NS_IMPL_COCOA
+#ifdef DAEMON_MUST_EXEC
       {
         /* In orig process, forked as child, OR in exec'd. */
         if (!dname_arg || !strchr (dname_arg, '\n'))
@@ -1054,7 +1075,7 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
                 dname_arg2);
         dname_arg = *dname_arg2 ? dname_arg2 : NULL;
       }
-#endif /* NS_IMPL_COCOA */
+#endif /* DAEMON_MUST_EXEC */
 
       if (dname_arg)
         daemon_name = xstrdup (dname_arg);
@@ -1357,6 +1378,9 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
 #ifdef WINDOWSNT
       syms_of_ntproc ();
 #endif /* WINDOWSNT */
+#if defined (CYGWIN) && defined (HAVE_NTGUI)
+      syms_of_cygw32 ();
+#endif /* defined(CYGWIN) && defined (HAVE_NTGUI) */
       syms_of_window ();
       syms_of_xdisp ();
       syms_of_font ();
@@ -1387,11 +1411,14 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
 #ifdef HAVE_NTGUI
       syms_of_w32term ();
       syms_of_w32fns ();
-      syms_of_w32select ();
       syms_of_w32menu ();
       syms_of_fontset ();
 #endif /* HAVE_NTGUI */
 
+#ifdef HAVE_W32SELECT
+      syms_of_w32select ();
+#endif /* HAVE_W32SELECT */
+
 #ifdef MSDOS
       syms_of_xmenu ();
       syms_of_dosfns ();
@@ -1437,8 +1464,11 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
       globals_of_w32font ();
       globals_of_w32fns ();
       globals_of_w32menu ();
-      globals_of_w32select ();
 #endif  /* HAVE_NTGUI */
+
+#ifdef HAVE_W32SELECT
+      globals_of_w32select ();
+#endif /* HAVE_W32SELECT */
     }
 
   init_charset ();
diff --git a/src/font.c b/src/font.c
index 1f22fee88ee..629e8bb977a 100644
--- a/src/font.c
+++ b/src/font.c
@@ -5208,9 +5208,9 @@ EMACS_FONT_LOG is set.  Otherwise, it is set to t.  */);
 #ifdef HAVE_BDFFONT
   syms_of_bdffont ();
 #endif  /* HAVE_BDFFONT */
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
   syms_of_w32font ();
-#endif  /* WINDOWSNT */
+#endif  /* HAVE_NTGUI */
 #ifdef HAVE_NS
   syms_of_nsfont ();
 #endif  /* HAVE_NS */
diff --git a/src/font.h b/src/font.h
index 0475eb665dd..3035a909efc 100644
--- a/src/font.h
+++ b/src/font.h
@@ -23,6 +23,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #define EMACS_FONT_H
 
 #include "ccl.h"
+#include "frame.h"
 
 /* We have three types of Lisp objects related to font.
 
@@ -818,11 +819,11 @@ extern struct font_driver ftxfont_driver;
 extern void syms_of_bdffont (void);
 #endif  /* HAVE_BDFFONT */
 #endif  /* HAVE_X_WINDOWS */
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
 extern struct font_driver w32font_driver;
 extern struct font_driver uniscribe_font_driver;
 extern void syms_of_w32font (void);
-#endif  /* WINDOWSNT */
+#endif  /* HAVE_NTGUI */
 #ifdef HAVE_NS
 extern Lisp_Object Qfontsize;
 extern struct font_driver nsfont_driver;
diff --git a/src/fontset.c b/src/fontset.c
index 7b051cbe1f3..da745b31ca1 100644
--- a/src/fontset.c
+++ b/src/fontset.c
@@ -42,7 +42,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #ifdef HAVE_X_WINDOWS
 #include "xterm.h"
 #endif
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
 #include "w32term.h"
 #endif
 #ifdef HAVE_NS
diff --git a/src/frame.c b/src/frame.c
index 2fcf7275f9c..599d8879169 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -2697,7 +2697,7 @@ static const struct frame_parm_table frame_parms[] =
   {"tool-bar-position",         &Qtool_bar_position},
 };
 
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
 
 /* Calculate fullscreen size.  Return in *TOP_POS and *LEFT_POS the
    wanted positions of the WM window (not Emacs window).
@@ -2741,7 +2741,7 @@ x_fullscreen_adjust (struct frame *f, int *width, int *height, int *top_pos, int
   *height = newheight;
 }
 
-#endif /* WINDOWSNT */
+#endif /* HAVE_NTGUI */
 
 #ifdef HAVE_WINDOW_SYSTEM
 
diff --git a/src/frame.h b/src/frame.h
index 26235cc036e..7bf76c21c56 100644
--- a/src/frame.h
+++ b/src/frame.h
@@ -618,7 +618,7 @@ typedef struct frame *FRAME_PTR;
 #define FRAME_INITIAL_P(f) ((f)->output_method == output_initial)
 #define FRAME_TERMCAP_P(f) ((f)->output_method == output_termcap)
 #define FRAME_X_P(f) ((f)->output_method == output_x_window)
-#ifndef WINDOWSNT
+#ifndef HAVE_NTGUI
 #define FRAME_W32_P(f) (0)
 #else
 #define FRAME_W32_P(f) ((f)->output_method == output_w32)
@@ -1210,7 +1210,7 @@ extern Lisp_Object x_new_font (struct frame *, Lisp_Object, int);
 
 extern Lisp_Object Qface_set_after_frame_default;
 
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
 extern void x_fullscreen_adjust (struct frame *f, int *, int *,
                                  int *, int *);
 #endif
@@ -1282,6 +1282,7 @@ extern char *x_get_resource_string (const char *, const char *);
 #endif
 
 extern void x_query_colors (struct frame *f, XColor *, int);
+extern void x_query_color (struct frame *f, XColor *);
 
 #endif /* HAVE_WINDOW_SYSTEM */
 
diff --git a/src/image.c b/src/image.c
index 91eeb91920c..6058bdf444c 100644
--- a/src/image.c
+++ b/src/image.c
@@ -75,7 +75,11 @@ typedef struct x_bitmap_record Bitmap_Record;
 #endif /* HAVE_X_WINDOWS */
 
 #ifdef HAVE_NTGUI
-#include "w32.h"
+# ifdef WINDOWSNT
+/* We only need (or want) w32.h when we're _not_
+ * compiling for Cygwin */
+# include "w32.h"
+# endif /* WINDOWSNT */
 /* W32_TODO : Color tables on W32.  */
 #undef COLOR_TABLE_SUPPORT
 
@@ -560,13 +564,14 @@ static struct image_type *lookup_image_type (Lisp_Object);
 static void x_laplace (struct frame *, struct image *);
 static void x_emboss (struct frame *, struct image *);
 static void x_build_heuristic_mask (struct frame *, struct image *,
-                                    Lisp_Object);
-#ifdef HAVE_NTGUI
+                                    Lisp_Object);
+#ifdef WINDOWSNT
+extern Lisp_Object Vlibrary_cache;
 #define CACHE_IMAGE_TYPE(type, status) \
   do { Vlibrary_cache = Fcons (Fcons (type, status), Vlibrary_cache); } while (0)
 #else
 #define CACHE_IMAGE_TYPE(type, status)
-#endif
+#endif /* WINDOWSNT */
 
 #define ADD_IMAGE_TYPE(type) \
   do { Vimage_types = Fcons (type, Vimage_types); } while (0)
@@ -589,7 +594,7 @@ define_image_type (struct image_type *type)
 
   if (type->init)
     {
-#ifdef HAVE_NTGUI
+#if defined (HAVE_NTGUI) && defined (WINDOWSNT)
       /* If we failed to load the library before, don't try again.  */
       Lisp_Object tested = Fassq (target_type, Vlibrary_cache);
       if (CONSP (tested) && NILP (XCDR (tested)))
@@ -1834,7 +1839,7 @@ mark_image_cache (struct image_cache *c)
                           X / NS / W32 support code
  ***********************************************************************/
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 
 /* Macro for defining functions that will be loaded from image DLLs.  */
 #define DEF_IMGLIB_FN(rettype,func,args) static rettype (FAR CDECL *fn_##func)args
@@ -1845,7 +1850,7 @@ mark_image_cache (struct image_cache *c)
     if (!fn_##func) return 0;                                           \
   }
 
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
 /* Return true if XIMG's size WIDTH x HEIGHT doesn't break the
    windowing system.
@@ -2897,7 +2902,7 @@ xbm_load (struct frame *f, struct image *img)
           else
             bits = (char *) XBOOL_VECTOR (data)->data;
 
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
           {
             char *invertedBits;
             int nbytes, i;
@@ -3008,7 +3013,7 @@ static const struct image_keyword xpm_format[XPM_LAST] =
   {":background",       IMAGE_STRING_OR_NIL_VALUE,              0}
 };
 
-#ifdef HAVE_NTGUI
+#if defined(HAVE_NTGUI) && defined(WINDOWSNT)
 static bool init_xpm_functions (void);
 #else
 #define init_xpm_functions NULL
@@ -3207,7 +3212,7 @@ xpm_free_colors (Display *dpy, Colormap cmap, Pixel *pixels, int npixels, void *
 #endif /* ALLOC_XPM_COLORS */
 
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 
 /* XPM library details.  */
 
@@ -3233,8 +3238,15 @@ init_xpm_functions (void)
   return 1;
 }
 
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
+#if defined (HAVE_NTGUI) && !defined (WINDOWSNT)
+/* Glue for code below */
+#define fn_XpmReadFileToImage XpmReadFileToImage
+#define fn_XpmCreateImageFromBuffer XpmCreateImageFromBuffer
+#define fn_XImageFree XImageFree
+#define fn_XpmFreeAttributes XpmFreeAttributes
+#endif /* HAVE_NTGUI && !WINDOWSNT */
 
 /* Value is true if COLOR_SYMBOLS is a valid color symbols list
    for XPM images.  Such a list must consist of conses whose car and
@@ -5340,7 +5352,7 @@ static const struct image_keyword png_format[PNG_LAST] =
   {":background",       IMAGE_STRING_OR_NIL_VALUE,              0}
 };
 
-#ifdef HAVE_NTGUI
+#if defined(HAVE_NTGUI) && defined (WINDOWSNT)
 static bool init_png_functions (void);
 #else
 #define init_png_functions NULL
@@ -5378,7 +5390,7 @@ png_image_p (Lisp_Object object)
 
 #ifdef HAVE_PNG
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 /* PNG library details.  */
 
 DEF_IMGLIB_FN (png_voidp, png_get_io_ptr, (png_structp));
@@ -5478,7 +5490,7 @@ init_png_functions (void)
 #define fn_png_set_longjmp_fn           png_set_longjmp_fn
 #endif /* libpng version >= 1.5 */
 
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
 /* Possibly inefficient/inexact substitutes for _setjmp and _longjmp.
    Do not use sys_setjmp, as PNG supports only jmp_buf.  The _longjmp
@@ -5999,7 +6011,7 @@ static const struct image_keyword jpeg_format[JPEG_LAST] =
   {":background",       IMAGE_STRING_OR_NIL_VALUE,              0}
 };
 
-#ifdef HAVE_NTGUI
+#if defined(HAVE_NTGUI) && defined(WINDOWSNT)
 static bool init_jpeg_functions (void);
 #else
 #define init_jpeg_functions NULL
@@ -6049,14 +6061,27 @@ jpeg_image_p (Lisp_Object object)
 #define __WIN32__ 1
 #endif
 
+/* rpcndr.h (via windows.h) and jpeglib.h both define boolean types.
+   Some versions of jpeglib try to detect whether rpcndr.h is loaded,
+   using the Windows boolean type instead of the jpeglib boolean type
+   if so.  Cygwin jpeglib, however, doesn't try to detect whether its
+   headers are included along with windows.h, so under Cygwin, jpeglib
+   attempts to define a conflicting boolean type.  Worse, forcing
+   Cygwin jpeglib headers to use the Windows boolean type doesn't work
+   because it created an ABI incompatibility between the
+   already-compiled jpeg library and the header interface definition.
+
+   The best we can do is to define jpeglib's boolean type to a
+   different name.  This name, jpeg_boolean, remains in effect through
+   the rest of image.c.
+*/
+#if defined (CYGWIN) && defined (HAVE_NTGUI)
+#define boolean jpeg_boolean
+#endif
 #include <jpeglib.h>
 #include <jerror.h>
 
-#ifdef HAVE_STLIB_H_1
-#define HAVE_STDLIB_H 1
-#endif
-
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 
 /* JPEG library details.  */
 DEF_IMGLIB_FN (void, jpeg_CreateDecompress, (j_decompress_ptr, int, size_t));
@@ -6106,7 +6131,7 @@ jpeg_resync_to_restart_wrapper (j_decompress_ptr cinfo, int desired)
 #define fn_jpeg_std_error               jpeg_std_error
 #define jpeg_resync_to_restart_wrapper  jpeg_resync_to_restart
 
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
 struct my_jpeg_error_mgr
 {
@@ -6630,7 +6655,7 @@ tiff_image_p (Lisp_Object object)
 
 #include <tiffio.h>
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 
 /* TIFF library details.  */
 DEF_IMGLIB_FN (TIFFErrorHandler, TIFFSetErrorHandler, (TIFFErrorHandler));
@@ -6674,7 +6699,7 @@ init_tiff_functions (void)
 #define fn_TIFFReadRGBAImage            TIFFReadRGBAImage
 #define fn_TIFFClose                    TIFFClose
 #define fn_TIFFSetDirectory             TIFFSetDirectory
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
 
 /* Reading from a memory buffer for TIFF images Based on the PNG
@@ -7046,7 +7071,7 @@ static const struct image_keyword gif_format[GIF_LAST] =
   {":background",       IMAGE_STRING_OR_NIL_VALUE,              0}
 };
 
-#ifdef HAVE_NTGUI
+#if defined(HAVE_NTGUI) && defined(WINDOWSNT)
 static bool init_gif_functions (void);
 #else
 #define init_gif_functions NULL
@@ -7110,7 +7135,7 @@ gif_image_p (Lisp_Object object)
 #endif /* HAVE_NTGUI */
 
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 
 /* GIF library details.  */
 DEF_IMGLIB_FN (int, DGifCloseFile, (GifFileType *));
@@ -7140,7 +7165,7 @@ init_gif_functions (void)
 #define fn_DGifOpen             DGifOpen
 #define fn_DGifOpenFileName     DGifOpenFileName
 
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
 /* Reading a GIF image from memory
    Based on the PNG memory stuff to a certain extent. */
@@ -8137,7 +8162,7 @@ svg_image_p (Lisp_Object object)
 
 #include <librsvg/rsvg.h>
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 
 /* SVG library functions.  */
 DEF_IMGLIB_FN (RsvgHandle *, rsvg_handle_new);
@@ -8215,7 +8240,7 @@ init_svg_functions (void)
 #define fn_g_type_init                    g_type_init
 #define fn_g_object_unref                 g_object_unref
 #define fn_g_error_free                   g_error_free
-#endif /* !HAVE_NTGUI  */
+#endif /* !WINDOWSNT  */
 
 /* Load SVG image IMG for use on frame F.  Value is true if
    successful.  */
diff --git a/src/keyboard.c b/src/keyboard.c
index ad0c5db0fc3..8316223cd28 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -313,8 +313,11 @@ static Lisp_Object Qmouse_fixup_help_message;
 /* Symbols to denote kinds of events.  */
 static Lisp_Object Qfunction_key;
 Lisp_Object Qmouse_click;
-#if defined (WINDOWSNT)
-Lisp_Object Qlanguage_change, Qfile_notify;
+#if defined (HAVE_NTGUI)
+Lisp_Object Qlanguage_change;
+#ifdef WINDOWSNT
+Lisp_Object Qfile_notify;
+#endif
 #endif
 static Lisp_Object Qdrag_n_drop;
 static Lisp_Object Qsave_session;
@@ -3766,8 +3769,8 @@ kbd_buffer_get_event (KBOARD **kbp,
 #ifdef subprocesses
   if (kbd_on_hold_p () && kbd_buffer_nr_stored () < KBD_BUFFER_SIZE/4)
     {
-      /* Start reading input again, we have processed enough so we can
-         accept new events again.  */
+      /* Start reading input again because we have processed enough to
+         be able to accept new events again.  */
       unhold_keyboard_input ();
       start_polling ();
     }
@@ -3947,7 +3950,7 @@ kbd_buffer_get_event (KBOARD **kbp,
             x_activate_menubar (XFRAME (event->frame_or_window));
         }
 #endif
-#if defined (WINDOWSNT)
+#if defined (HAVE_NTGUI)
       else if (event->kind == LANGUAGE_CHANGE_EVENT)
         {
           /* Make an event (language-change (FRAME CODEPAGE LANGUAGE-ID)).  */
@@ -5427,7 +5430,7 @@ make_lispy_event (struct input_event *event)
                                   (sizeof (lispy_function_keys)
                                    / sizeof (lispy_function_keys[0])));
 
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
     case MULTIMEDIA_KEY_EVENT:
       if (event->code < (sizeof (lispy_multimedia_keys)
                          / sizeof (lispy_multimedia_keys[0]))
@@ -11404,7 +11407,7 @@ syms_of_keyboard (void)
   DEFSYM (Qconfig_changed_event, "config-changed-event");
   DEFSYM (Qmenu_enable, "menu-enable");
 
-#if defined (WINDOWSNT)
+#if defined (HAVE_NTGUI)
   DEFSYM (Qlanguage_change, "language-change");
   DEFSYM (Qfile_notify, "file-notify");
 #endif
diff --git a/src/keyboard.h b/src/keyboard.h
index bc35bba4ecc..d78c27fbf9b 100644
--- a/src/keyboard.h
+++ b/src/keyboard.h
@@ -551,7 +551,7 @@ extern int tty_read_avail_input (struct terminal *, struct input_event *);
 extern EMACS_TIME timer_check (void);
 extern void mark_kboards (void);
 
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
 extern const char *const lispy_function_keys[];
 #endif
 
diff --git a/src/makefile.w32-in b/src/makefile.w32-in
index f051ed6a8a9..5fc5b6ece46 100644
--- a/src/makefile.w32-in
+++ b/src/makefile.w32-in
@@ -208,7 +208,7 @@ make-buildobj-SH:
 GLOBAL_SOURCES =   dosfns.c msdos.c \
         xterm.c xfns.c xmenu.c xselect.c xrdb.c xsmfns.c fringe.c image.c \
         fontset.c menu.c dbusbind.c \
-        w32.c w32console.c w32fns.c w32heap.c w32inevt.c \
+        w32.c w32console.c w32fns.c w32heap.c w32inevt.c cygw32.c \
         w32menu.c w32proc.c w32reg.c w32select.c w32term.c w32xfns.c \
         font.c w32font.c w32uniscribe.c w32notify.c \
         dispnew.c frame.c scroll.c xdisp.c window.c bidi.c \
@@ -425,6 +425,7 @@ DISPEXTERN_H   = $(SRC)/dispextern.h \
 FILEMODE_H     = $(GNU_LIB)/filemode.h \
                  $(NT_INC)/sys/stat.h
 FONT_H         = $(SRC)/font.h \
+                 $(FRAME_H) \
                  $(CCL_H)
 FRAME_H        = $(SRC)/frame.h \
                  $(DISPEXTERN_H)
@@ -477,6 +478,8 @@ TERMHOOKS_H    = $(SRC)/termhooks.h \
 W32FONT_H      = $(SRC)/w32font.h \
                  $(FONT_H)
 W32TERM_H      = $(SRC)/w32term.h \
+                 $(ATIMER_H) \
+                 $(FRAME_H) \
                  $(W32GUI_H)
 WINDOW_H       = $(SRC)/window.h \
                  $(DISPEXTERN_H)
@@ -797,6 +800,8 @@ $(BLD)/emacs.$(O) : \
         $(SRC)/unexec.h \
         $(SRC)/w32.h \
         $(SRC)/w32heap.h \
+        $(SRC)/w32select.h \
+        $(SRC)/w32font.h \
         $(NT_INC)/sys/file.h \
         $(NT_INC)/unistd.h \
         $(GNU_LIB)/ignore-value.h \
@@ -1234,6 +1239,7 @@ $(BLD)/w32console.$(O) : \
         $(FRAME_H) \
         $(LISP_H) \
         $(TERMHOOKS_H) \
+        $(W32TERM_H) \
         $(WINDOW_H)
 
 $(BLD)/print.$(O) : \
diff --git a/src/menu.c b/src/menu.c
index 5374aa9157a..835267b2f0c 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -40,7 +40,11 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #endif /* HAVE_WINDOW_SYSTEM */
 
 #ifdef HAVE_NTGUI
+# ifdef NTGUI_UNICODE
+# define unicode_append_menu AppendMenuW
+# else /* !NTGUI_UNICODE */
 extern AppendMenuW_Proc unicode_append_menu;
+# endif /* NTGUI_UNICODE */
 extern HMENU current_popup_menu;
 #endif /* HAVE_NTGUI  */
 
diff --git a/src/process.c b/src/process.c
index 92bea0d3a27..c941a196539 100644
--- a/src/process.c
+++ b/src/process.c
@@ -4646,6 +4646,7 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
               process_output_skip = 0;
             }
 #endif
+
 #if defined (USE_GTK) || defined (HAVE_GCONF) || defined (HAVE_GSETTINGS)
           nfds = xg_select
 #elif defined (HAVE_NS)
diff --git a/src/ralloc.c b/src/ralloc.c
index e4a8fe9c6da..11897411930 100644
--- a/src/ralloc.c
+++ b/src/ralloc.c
@@ -327,10 +327,11 @@ relinquish (void)
 
       if ((char *)last_heap->end - (char *)last_heap->bloc_start <= excess)
         {
-          /* This heap should have no blocs in it.  */
+          /* This heap should have no blocs in it.  If it does, we
+             cannot return it to the system.  */
           if (last_heap->first_bloc != NIL_BLOC
               || last_heap->last_bloc != NIL_BLOC)
-            emacs_abort ();
+            return;
 
           /* Return the last heap, with its header, to the system.  */
           excess = (char *)last_heap->end - (char *)last_heap->start;
diff --git a/src/termhooks.h b/src/termhooks.h
index 0afd7d97e7b..285a1824ecb 100644
--- a/src/termhooks.h
+++ b/src/termhooks.h
@@ -107,9 +107,9 @@ enum event_kind
   HORIZ_WHEEL_EVENT,            /* A wheel event generated by a second
                                    horizontal wheel that is present on some
                                    mice. See WHEEL_EVENT.  */
-#if defined (WINDOWSNT)
+#if defined (HAVE_NTGUI)
   LANGUAGE_CHANGE_EVENT,        /* A LANGUAGE_CHANGE_EVENT is
-                                   generated on WINDOWSNT or Mac OS
+                                   generated when HAVE_NTGUI or on Mac OS
                                    when the keyboard layout or input
                                    language is changed by the
                                    user.  */
@@ -188,7 +188,7 @@ enum event_kind
 
   , CONFIG_CHANGED_EVENT
 
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
   /* Generated when an APPCOMMAND event is received, in response to
      Multimedia or Internet buttons on some keyboards.
      Such keys are available as normal function keys on X through the
diff --git a/src/unexw32.c b/src/unexw32.c
index 3eefc9ce058..d57378b2421 100644
--- a/src/unexw32.c
+++ b/src/unexw32.c
@@ -83,7 +83,7 @@ DWORD_PTR  extra_bss_size_static = 0;
 PIMAGE_SECTION_HEADER heap_section;
 
 #ifdef HAVE_NTGUI
-HINSTANCE hinst = NULL;
+extern HINSTANCE hinst;
 HINSTANCE hprevinst = NULL;
 LPSTR lpCmdLine = "";
 int nCmdShow = 0;
diff --git a/src/w32.c b/src/w32.c
index f17c06ea807..85210cb8e4c 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -31,13 +31,13 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <sys/file.h>
 #include <sys/time.h>
 #include <sys/utime.h>
-#include <mbstring.h>   /* for _mbspbrk */
 #include <math.h>
 #include <time.h>
 
 /* must include CRT headers *before* config.h */
 
 #include <config.h>
+#include <mbstring.h>   /* for _mbspbrk */
 
 #undef access
 #undef chdir
@@ -866,23 +866,6 @@ create_symbolic_link (LPTSTR lpSymlinkFilename,
   return retval;
 }
 
-/* Equivalent of strerror for W32 error codes.  */
-char *
-w32_strerror (int error_no)
-{
-  static char buf[500];
-
-  if (error_no == 0)
-    error_no = GetLastError ();
-
-  buf[0] = '\0';
-  if (!FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM, NULL,
-                      error_no,
-                      0, /* choose most suitable language */
-                      buf, sizeof (buf), NULL))
-    sprintf (buf, "w32 error %u", error_no);
-  return buf;
-}
 
 /* Return 1 if P is a valid pointer to an object of size SIZE.  Return
    0 if P is NOT a valid pointer.  Return -1 if we cannot validate P.
diff --git a/src/w32.h b/src/w32.h
index 2e2315e245d..c4cfdf5fedd 100644
--- a/src/w32.h
+++ b/src/w32.h
@@ -19,6 +19,12 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
+#ifdef CYGWIN
+#error "w32.h is not compatible with Cygwin"
+#endif
+
+#include <windows.h>
+
 
 /* File descriptor set emulation.  */
 
@@ -130,17 +136,6 @@ extern LPBYTE w32_get_resource (char * key, LPDWORD type);
 extern void init_ntproc (int);
 extern void term_ntproc (int);
 extern void globals_of_w32 (void);
-extern void syms_of_w32term (void);
-extern void syms_of_w32fns (void);
-extern void globals_of_w32fns (void);
-extern void syms_of_w32select (void);
-extern void globals_of_w32select (void);
-extern void term_w32select (void);
-extern void syms_of_w32menu (void);
-extern void globals_of_w32menu (void);
-extern void syms_of_fontset (void);
-extern void syms_of_w32font (void);
-extern void check_windows_init_file (void);
 
 extern void term_timers (void);
 extern void init_timers (void);
diff --git a/src/w32console.c b/src/w32console.c
index b22b09af2f2..5a44d3748a2 100644
--- a/src/w32console.c
+++ b/src/w32console.c
@@ -36,6 +36,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "termhooks.h"
 #include "termchar.h"
 #include "dispextern.h"
+#include "w32term.h"
 #include "w32heap.h"    /* for os_subtype */
 #include "w32inevt.h"
 
@@ -430,53 +431,6 @@ w32con_delete_glyphs (struct frame *f, int n)
   scroll_line (f, n, LEFT);
 }
 
-static unsigned int sound_type = 0xFFFFFFFF;
-#define MB_EMACS_SILENT (0xFFFFFFFF - 1)
-
-void
-w32_sys_ring_bell (struct frame *f)
-{
-  if (sound_type == 0xFFFFFFFF)
-    {
-      Beep (666, 100);
-    }
-  else if (sound_type == MB_EMACS_SILENT)
-    {
-      /* Do nothing.  */
-    }
-  else
-    MessageBeep (sound_type);
-}
-
-DEFUN ("set-message-beep", Fset_message_beep, Sset_message_beep, 1, 1, 0,
-       doc: /* Set the sound generated when the bell is rung.
-SOUND is 'asterisk, 'exclamation, 'hand, 'question, 'ok, or 'silent
-to use the corresponding system sound for the bell.  The 'silent sound
-prevents Emacs from making any sound at all.
-SOUND is nil to use the normal beep.  */)
-  (Lisp_Object sound)
-{
-  CHECK_SYMBOL (sound);
-
-  if (NILP (sound))
-      sound_type = 0xFFFFFFFF;
-  else if (EQ (sound, intern ("asterisk")))
-      sound_type = MB_ICONASTERISK;
-  else if (EQ (sound, intern ("exclamation")))
-      sound_type = MB_ICONEXCLAMATION;
-  else if (EQ (sound, intern ("hand")))
-      sound_type = MB_ICONHAND;
-  else if (EQ (sound, intern ("question")))
-      sound_type = MB_ICONQUESTION;
-  else if (EQ (sound, intern ("ok")))
-      sound_type = MB_OK;
-  else if (EQ (sound, intern ("silent")))
-      sound_type = MB_EMACS_SILENT;
-  else
-      sound_type = 0xFFFFFFFF;
-
-  return sound;
-}
 
 static void
 w32con_reset_terminal_modes (struct terminal *t)
@@ -850,5 +804,4 @@ scroll-back buffer.  */);
   defsubr (&Sset_screen_color);
   defsubr (&Sget_screen_color);
   defsubr (&Sset_cursor_size);
-  defsubr (&Sset_message_beep);
 }
diff --git a/src/w32fns.c b/src/w32fns.c
index fac6030b9b5..5833a59497d 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -44,8 +44,14 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "fontset.h"
 #include "systime.h"
 #include "termhooks.h"
+
 #include "w32heap.h"
+
+#if CYGWIN
+#include "cygw32.h"
+#else
 #include "w32.h"
+#endif
 
 #include "bitmaps/gray.xbm"
 
@@ -58,9 +64,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <dlgs.h>
 #include <imm.h>
-#define FILE_NAME_TEXT_FIELD edt1
-#define FILE_NAME_COMBO_BOX cmb13
-#define FILE_NAME_LIST lst1
 
 #include "font.h"
 #include "w32font.h"
@@ -78,6 +81,7 @@ extern int w32_console_toggle_lock_key (int, Lisp_Object);
 extern void w32_menu_display_help (HWND, HMENU, UINT, UINT);
 extern void w32_free_menu_strings (HWND);
 extern const char *map_w32_filename (const char *, const char **);
+extern char * w32_strerror (int error_no);
 
 /* If non-NULL, a handle to a frame where to display the hourglass cursor.  */
 static HWND hourglass_hwnd = NULL;
@@ -161,7 +165,11 @@ ImmSetCompositionWindow_Proc set_ime_composition_window_fn = NULL;
 MonitorFromPoint_Proc monitor_from_point_fn = NULL;
 GetMonitorInfo_Proc get_monitor_info_fn = NULL;
 
+#ifdef NTGUI_UNICODE
+#define unicode_append_menu AppendMenuW
+#else /* !NTGUI_UNICODE */
 extern AppendMenuW_Proc unicode_append_menu;
+#endif /* NTGUI_UNICODE */
 
 /* Flag to selectively ignore WM_IME_CHAR messages.  */
 static int ignore_ime_char = 0;
@@ -198,6 +206,33 @@ extern int uniscribe_available;
 static void w32_show_hourglass (struct frame *);
 static void w32_hide_hourglass (void);
 
+#ifdef WINDOWSNT
+/* From w32inevet.c */
+extern int faked_key;
+#endif /* WINDOWSNT */
+
+/* This gives us the page size and the size of the allocation unit on NT.  */
+SYSTEM_INFO sysinfo_cache;
+
+/* This gives us version, build, and platform identification.  */
+OSVERSIONINFO osinfo_cache;
+
+unsigned long syspage_mask = 0;
+
+/* The major and minor versions of NT.  */
+int w32_major_version;
+int w32_minor_version;
+int w32_build_number;
+
+/* Distinguish between Windows NT and Windows 95.  */
+int os_subtype;
+
+#ifdef HAVE_NTGUI
+HINSTANCE hinst = NULL;
+#endif
+
+static unsigned int sound_type = 0xFFFFFFFF;
+#define MB_EMACS_SILENT (0xFFFFFFFF - 1)
 
 
 /* Error if we are not connected to MS-Windows.  */
@@ -662,7 +697,7 @@ DEFUN ("w32-default-color-map", Fw32_default_color_map, Sw32_default_color_map,
 }
 
 static Lisp_Object
-w32_color_map_lookup (char *colorname)
+w32_color_map_lookup (const char *colorname)
 {
   Lisp_Object tail, ret = Qnil;
 
@@ -741,7 +776,7 @@ add_system_logical_colors_to_map (Lisp_Object *system_colors)
 
 
 static Lisp_Object
-x_to_w32_color (char * colorname)
+x_to_w32_color (const char * colorname)
 {
   register Lisp_Object ret = Qnil;
 
@@ -750,11 +785,10 @@ x_to_w32_color (char * colorname)
   if (colorname[0] == '#')
     {
       /* Could be an old-style RGB Device specification.  */
-      char *color;
-      int size;
-      color = colorname + 1;
+      int size = strlen (colorname + 1);
+      char *color = alloca (size + 1);
 
-      size = strlen (color);
+      strcpy (color, colorname + 1);
       if (size == 3 || size == 6 || size == 9 || size == 12)
         {
           UINT colorval;
@@ -808,7 +842,7 @@ x_to_w32_color (char * colorname)
     }
   else if (strnicmp (colorname, "rgb:", 4) == 0)
     {
-      char *color;
+      const char *color;
       UINT colorval;
       int i, pos;
       pos = 0;
@@ -864,7 +898,7 @@ x_to_w32_color (char * colorname)
   else if (strnicmp (colorname, "rgbi:", 5) == 0)
     {
       /* This is an RGB Intensity specification.  */
-      char *color;
+      const char *color;
       UINT colorval;
       int i, pos;
       pos = 0;
@@ -1068,7 +1102,7 @@ gamma_correct (struct frame *f, COLORREF *color)
    If ALLOC is nonzero, allocate a new colormap cell.  */
 
 int
-w32_defined_color (FRAME_PTR f, char *color, XColor *color_def, int alloc)
+w32_defined_color (FRAME_PTR f, const char *color, XColor *color_def, int alloc)
 {
   register Lisp_Object tem;
   COLORREF w32_color_ref;
@@ -1843,10 +1877,7 @@ w32_createwindow (struct frame *f)
 
   /* Do first time app init */
 
-  if (!hprevinst)
-    {
-      w32_init_class (hinst);
-    }
+  w32_init_class (hinst);
 
   if (f->size_hint_flags & USPosition || f->size_hint_flags & PPosition)
     {
@@ -2246,6 +2277,84 @@ unregister_hot_keys (HWND hwnd)
     }
 }
 
+#if EMACSDEBUG
+const char*
+w32_name_of_message (UINT msg)
+{
+  unsigned i;
+  static char buf[64];
+  static const struct {
+    UINT msg;
+    const char* name;
+  } msgnames[] = {
+#define M(msg) { msg, # msg }
+      M (WM_PAINT),
+      M (WM_TIMER),
+      M (WM_USER),
+      M (WM_MOUSEMOVE),
+      M (WM_LBUTTONUP),
+      M (WM_KEYDOWN),
+      M (WM_EMACS_KILL),
+      M (WM_EMACS_CREATEWINDOW),
+      M (WM_EMACS_DONE),
+      M (WM_EMACS_CREATESCROLLBAR),
+      M (WM_EMACS_SHOWWINDOW),
+      M (WM_EMACS_SETWINDOWPOS),
+      M (WM_EMACS_DESTROYWINDOW),
+      M (WM_EMACS_TRACKPOPUPMENU),
+      M (WM_EMACS_SETFOCUS),
+      M (WM_EMACS_SETFOREGROUND),
+      M (WM_EMACS_SETLOCALE),
+      M (WM_EMACS_SETKEYBOARDLAYOUT),
+      M (WM_EMACS_REGISTER_HOT_KEY),
+      M (WM_EMACS_UNREGISTER_HOT_KEY),
+      M (WM_EMACS_TOGGLE_LOCK_KEY),
+      M (WM_EMACS_TRACK_CARET),
+      M (WM_EMACS_DESTROY_CARET),
+      M (WM_EMACS_SHOW_CARET),
+      M (WM_EMACS_HIDE_CARET),
+      M (WM_EMACS_SETCURSOR),
+      M (WM_EMACS_PAINT),
+      M (WM_CHAR),
+#undef M
+      { 0, 0 }
+  };
+
+  for (i = 0; msgnames[i].name; ++i)
+    if (msgnames[i].msg == msg)
+      return msgnames[i].name;
+
+  sprintf (buf, "message 0x%04x", (unsigned)msg);
+  return buf;
+}
+#endif /* EMACSDEBUG */
+
+/* Here's an overview of how Emacs input works on MS-Windows.
+
+   System messages are read and processed by w32_msg_pump below.  This
+   function runs in a separate thread.  It handles a small number of
+   custom WM_EMACS_* messages (posted by the main thread, look for
+   PostMessage calls), and dispatches the rest to w32_wnd_proc, which
+   is the main window procedure for the entire Emacs application.
+
+   w32_wnd_proc also runs in the same separate input thread.  It
+   handles some messages, mostly those that need GDI calls, by itself.
+   For the others, it calls my_post_msg, which inserts the messages
+   into the input queue serviced by w32_read_socket.
+
+   w32_read_socket runs in the main (a.k.a. "Lisp") thread, and is
+   called synchronously from keyboard.c when it is known or suspected
+   that some input is available.  w32_read_socket either handles
+   messages immediately, or converts them into Emacs input events and
+   stuffs them into kbd_buffer, where kbd_buffer_get_event can get at
+   them and process them when read_char and its callers require
+   input.
+
+   Under Cygwin with the W32 toolkit, the use of /dev/windows with
+   select(2) takes the place of w32_read_socket.
+
+   */
+
 /* Main message dispatch loop. */
 
 static void
@@ -2259,6 +2368,10 @@ w32_msg_pump (deferred_msg * msg_buf)
 
   while ((w32_unicode_gui ? GetMessageW : GetMessageA) (&msg, NULL, 0, 0))
     {
+
+      /* DebPrint (("w32_msg_pump: %s time:%u\n", */
+      /*            w32_name_of_message (msg.message), msg.time)); */
+
       if (msg.hwnd == NULL)
         {
           switch (msg.message)
@@ -2346,7 +2459,7 @@ w32_msg_pump (deferred_msg * msg_buf)
               /* Broadcast messages make it here, so you need to be looking
                  for something in particular for this to be useful.  */
             default:
-              DebPrint (("msg %x not expected by w32_msg_pump\n", msg.message));
+              DebPrint (("msg %x not expected by w32_msg_pump\n", msg.message));
 #endif
             }
         }
@@ -4685,6 +4798,37 @@ If omitted or nil, that stands for the selected frame's display.  */)
 {
   return Qnil;
 }
+
+DEFUN ("set-message-beep", Fset_message_beep, Sset_message_beep, 1, 1, 0,
+       doc: /* Set the sound generated when the bell is rung.
+SOUND is 'asterisk, 'exclamation, 'hand, 'question, 'ok, or 'silent
+to use the corresponding system sound for the bell.  The 'silent sound
+prevents Emacs from making any sound at all.
+SOUND is nil to use the normal beep.  */)
+  (Lisp_Object sound)
+{
+  CHECK_SYMBOL (sound);
+
+  if (NILP (sound))
+      sound_type = 0xFFFFFFFF;
+  else if (EQ (sound, intern ("asterisk")))
+      sound_type = MB_ICONASTERISK;
+  else if (EQ (sound, intern ("exclamation")))
+      sound_type = MB_ICONEXCLAMATION;
+  else if (EQ (sound, intern ("hand")))
+      sound_type = MB_ICONHAND;
+  else if (EQ (sound, intern ("question")))
+      sound_type = MB_ICONQUESTION;
+  else if (EQ (sound, intern ("ok")))
+      sound_type = MB_OK;
+  else if (EQ (sound, intern ("silent")))
+      sound_type = MB_EMACS_SILENT;
+  else
+      sound_type = 0xFFFFFFFF;
+
+  return sound;
+}
+
 
 int
 x_pixel_width (register struct frame *f)
@@ -4766,12 +4910,21 @@ terminate Emacs if we can't open the connection.
   unsigned char *xrm_option;
   struct w32_display_info *dpyinfo;
 
+  CHECK_STRING (display);
+
+  /* Signal an error in order to encourage correct use from callers.
+   * If we ever support multiple window systems in the same Emacs,
+   * we'll need callers to be precise about what window system they
+   * want.  */
+
+  if (strcmp (SSDATA (display), "w32") != 0)
+    error ("The name of the display in this Emacs must be \"w32\"");
+
   /* If initialization has already been done, return now to avoid
      overwriting critical parts of one_w32_display_info.  */
   if (w32_in_use)
     return Qnil;
 
-  CHECK_STRING (display);
   if (! NILP (xrm_string))
     CHECK_STRING (xrm_string);
 
@@ -5842,6 +5995,18 @@ Value is t if tooltip was open, nil otherwise.  */)
                         File selection dialog
  ***********************************************************************/
 
+#define FILE_NAME_TEXT_FIELD edt1
+#define FILE_NAME_COMBO_BOX cmb13
+#define FILE_NAME_LIST lst1
+
+#ifdef NTGUI_UNICODE
+#define GUISTR(x) (L ## x)
+typedef wchar_t guichar_t;
+#else /* !NTGUI_UNICODE */
+#define GUISTR(x) x
+typedef char guichar_t;
+#endif /* NTGUI_UNICODE */
+
 /* Callback for altering the behavior of the Open File dialog.
    Makes the Filename text field contain "Current Directory" and be
    read-only when "Directories" is selected in the filter.  This
@@ -5852,7 +6017,11 @@ file_dialog_callback (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
   if (msg == WM_NOTIFY)
     {
-      OFNOTIFY * notify = (OFNOTIFY *)lParam;
+#ifdef NTGUI_UNICODE
+      OFNOTIFYW * notify = (OFNOTIFYW *)lParam;
+#else /* !NTGUI_UNICODE */
+      OFNOTIFYA * notify = (OFNOTIFYA *)lParam;
+#endif /* NTGUI_UNICODE */
       /* Detect when the Filter dropdown is changed.  */
       if (notify->hdr.code == CDN_TYPECHANGE
           || notify->hdr.code == CDN_INITDONE)
@@ -5880,7 +6049,7 @@ file_dialog_callback (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
           if (notify->lpOFN->nFilterIndex == 2)
             {
               CommDlg_OpenSave_SetControlText (dialog, FILE_NAME_TEXT_FIELD,
-                                               "Current Directory");
+                                               GUISTR ("Current Directory"));
               EnableWindow (edit_control, FALSE);
               /* Note that at least on Windows 7, the above call to EnableWindow
                  disables the window that would ordinarily have focus.  If we
@@ -5896,7 +6065,8 @@ file_dialog_callback (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
               /* Don't override default filename on init done.  */
               if (notify->hdr.code == CDN_TYPECHANGE)
                 CommDlg_OpenSave_SetControlText (dialog,
-                                                 FILE_NAME_TEXT_FIELD, "");
+                                                 FILE_NAME_TEXT_FIELD,
+                                                 GUISTR (""));
               EnableWindow (edit_control, TRUE);
             }
         }
@@ -5904,19 +6074,6 @@ file_dialog_callback (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
   return 0;
 }
 
-/* Since we compile with _WIN32_WINNT set to 0x0400 (for NT4 compatibility)
-   we end up with the old file dialogs. Define a big enough struct for the
-   new dialog to trick GetOpenFileName into giving us the new dialogs on
-   Windows 2000 and XP.  */
-typedef struct
-{
-  OPENFILENAME real_details;
-  void * pReserved;
-  DWORD dwReserved;
-  DWORD FlagsEx;
-} NEWOPENFILENAME;
-
-
 DEFUN ("x-file-dialog", Fx_file_dialog, Sx_file_dialog, 2, 5, 0,
        doc: /* Read file name, prompting with PROMPT in directory DIR.
 Use a file selection dialog.  Select DEFAULT-FILENAME in the dialog's file
@@ -5928,134 +6085,204 @@ Motif or Gtk toolkits.  With the Motif toolkit, ONLY-DIR-P is ignored.
 Otherwise, if ONLY-DIR-P is non-nil, the user can only select directories.  */)
   (Lisp_Object prompt, Lisp_Object dir, Lisp_Object default_filename, Lisp_Object mustmatch, Lisp_Object only_dir_p)
 {
+  /* Filter index: 1: All Files, 2: Directories only  */
+  static const guichar_t filter[] =
+    GUISTR ("All Files (*.*)\0*.*\0Directories\0*|*\0");
+
+  Lisp_Object filename = default_filename;
   struct frame *f = SELECTED_FRAME ();
-  Lisp_Object file = Qnil;
-  ptrdiff_t count = SPECPDL_INDEX ();
+  BOOL file_opened = FALSE;
+  Lisp_Object orig_dir = dir;
+  Lisp_Object orig_prompt = prompt;
+
+  /* If we compile with _WIN32_WINNT set to 0x0400 (for NT4
+     compatibility) we end up with the old file dialogs. Define a big
+     enough struct for the new dialog to trick GetOpenFileName into
+     giving us the new dialogs on newer versions of Windows.  */
+  struct {
+#ifdef NTGUI_UNICODE
+    OPENFILENAMEW details;
+#else /* !NTGUI_UNICODE */
+    OPENFILENAMEA details;
+#endif /* NTGUI_UNICODE */
+
+#if _WIN32_WINNT < 0x500 /* < win2k */
+      PVOID pvReserved;
+      DWORD dwReserved;
+      DWORD FlagsEx;
+#endif /* < win2k */
+  } new_file_details;
+
+#ifdef NTGUI_UNICODE
+  wchar_t filename_buf[MAX_PATH + 1];
+  OPENFILENAMEW * file_details = &new_file_details.details;
+#else /* not NTGUI_UNICODE */
+  char filename_buf[MAX_PATH + 1];
+  OPENFILENAMEA * file_details = &new_file_details.details;
+#endif /* NTGUI_UNICODE */
+
   struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5, gcpro6;
-  char filename[MAX_PATH + 1];
-  char init_dir[MAX_PATH + 1];
-  int default_filter_index = 1; /* 1: All Files, 2: Directories only  */
-
-  GCPRO6 (prompt, dir, default_filename, mustmatch, only_dir_p, file);
-  CHECK_STRING (prompt);
-  CHECK_STRING (dir);
-
-  /* Create the dialog with PROMPT as title, using DIR as initial
-     directory and using "*" as pattern.  */
-  dir = Fexpand_file_name (dir, Qnil);
-  strncpy (init_dir, SDATA (ENCODE_FILE (dir)), MAX_PATH);
-  init_dir[MAX_PATH] = '\0';
-  unixtodos_filename (init_dir);
-
-  if (STRINGP (default_filename))
-    {
-      char *file_name_only;
-      char *full_path_name = SDATA (ENCODE_FILE (default_filename));
+  GCPRO6 (prompt, dir, default_filename, mustmatch, only_dir_p, filename);
 
-      unixtodos_filename (full_path_name);
+  {
+    struct gcpro gcpro1, gcpro2;
+    GCPRO2 (orig_dir, orig_prompt); /* There is no GCPRON, N>6.  */
 
-      file_name_only = strrchr (full_path_name, '\\');
-      if (!file_name_only)
-        file_name_only = full_path_name;
-      else
-        file_name_only++;
+    /* Note: under NTGUI_UNICODE, we do _NOT_ use ENCODE_FILE: the
+       system file encoding expected by the platform APIs (e.g. Cygwin's
+       POSIX implementation) may not be the same as the encoding expected
+       by the Windows "ANSI" APIs!  */
 
-      strncpy (filename, file_name_only, MAX_PATH);
-      filename[MAX_PATH] = '\0';
-    }
-  else
-    filename[0] = '\0';
+    CHECK_STRING (prompt);
+    CHECK_STRING (dir);
 
-  /* The code in file_dialog_callback that attempts to set the text
-     of the file name edit window when handling the CDN_INITDONE
-     WM_NOTIFY message does not work.  Setting filename to "Current
-     Directory" in the only_dir_p case here does work however.  */
-  if (filename[0] == 0 && ! NILP (only_dir_p))
-    strcpy (filename, "Current Directory");
+    dir = Fexpand_file_name (dir, Qnil);
 
-  {
-    NEWOPENFILENAME new_file_details;
-    BOOL file_opened = FALSE;
-    OPENFILENAME * file_details = &new_file_details.real_details;
+    if (STRINGP (filename))
+      filename = Ffile_name_nondirectory (filename);
+    else
+      filename = empty_unibyte_string;
 
-    /* Prevent redisplay.  */
-    specbind (Qinhibit_redisplay, Qt);
-    block_input ();
+#ifdef CYGWIN
+    dir = Fcygwin_convert_path_to_windows (dir, Qt);
+    if (SCHARS (filename) > 0)
+      filename = Fcygwin_convert_path_to_windows (filename, Qnil);
+#endif
 
+    CHECK_STRING (dir);
+    CHECK_STRING (filename);
+
+    /* The code in file_dialog_callback that attempts to set the text
+       of the file name edit window when handling the CDN_INITDONE
+       WM_NOTIFY message does not work.  Setting filename to "Current
+       Directory" in the only_dir_p case here does work however.  */
+    if (SCHARS (filename) == 0 && ! NILP (only_dir_p))
+      filename = build_string ("Current Directory");
+
+    /* Convert the values we've computed so far to system form.  */
+#ifdef NTGUI_UNICODE
+    to_unicode (prompt, &prompt);
+    to_unicode (dir, &dir);
+    to_unicode (filename, &filename);
+#else /* !NTGUI_UNICODE */
+    prompt = ENCODE_FILE (prompt);
+    dir = ENCODE_FILE (dir);
+    filename = ENCODE_FILE (filename);
+
+    /* We modify these in-place, so make copies for safety.  */
+    dir = Fcopy_sequence (dir);
+    unixtodos_filename (SDATA (dir));
+    filename = Fcopy_sequence (filename);
+    unixtodos_filename (SDATA (filename));
+#endif /* NTGUI_UNICODE */
+
+    /* Fill in the structure for the call to GetOpenFileName below.  For
+       NTGUI_UNICODE builds (which run only on NT), we just use the
+       actual size of the structure.  For non-NTGUI_UNICODE builds, we
+       tell the OS we're using an old version of the structure if it's not
+       new enough to support the newer version.  */
     memset (&new_file_details, 0, sizeof (new_file_details));
-    /* Apparently NT4 crashes if you give it an unexpected size.
-       I'm not sure about Windows 9x, so play it safe.  */
+
     if (w32_major_version > 4 && w32_major_version < 95)
-      file_details->lStructSize = sizeof (NEWOPENFILENAME);
+      file_details->lStructSize = sizeof (new_file_details);
     else
-      file_details->lStructSize = sizeof (OPENFILENAME);
+      file_details->lStructSize = sizeof (*file_details);
+
+    /* Set up the inout parameter for the selected file name.  */
+    if (SBYTES (filename) + 1 > sizeof (filename_buf))
+      error ("filename too long");
+
+    memcpy (filename_buf, SDATA (filename), SBYTES (filename) + 1);
+    file_details->lpstrFile = filename_buf;
+    file_details->nMaxFile = sizeof (filename_buf) / sizeof (*filename_buf);
 
     file_details->hwndOwner = FRAME_W32_WINDOW (f);
     /* Undocumented Bug in Common File Dialog:
        If a filter is not specified, shell links are not resolved.  */
-    file_details->lpstrFilter = "All Files (*.*)\0*.*\0Directories\0*|*\0\0";
-    file_details->lpstrFile = filename;
-    file_details->nMaxFile = sizeof (filename);
-    file_details->lpstrInitialDir = init_dir;
-    file_details->lpstrTitle = SDATA (prompt);
-
-    if (! NILP (only_dir_p))
-      default_filter_index = 2;
-
-    file_details->nFilterIndex = default_filter_index;
-
+    file_details->lpstrFilter = filter;
+    file_details->lpstrInitialDir = (guichar_t*) SDATA (dir);
+    file_details->lpstrTitle = (guichar_t*) SDATA (prompt);
+    file_details->nFilterIndex = NILP (only_dir_p) ? 1 : 2;
     file_details->Flags = (OFN_HIDEREADONLY | OFN_NOCHANGEDIR
-                          | OFN_EXPLORER | OFN_ENABLEHOOK);
+                           | OFN_EXPLORER | OFN_ENABLEHOOK);
+
     if (!NILP (mustmatch))
       {
-        /* Require that the path to the parent directory exists.  */
-        file_details->Flags |= OFN_PATHMUSTEXIST;
-        /* If we are looking for a file, require that it exists.  */
-        if (NILP (only_dir_p))
-          file_details->Flags |= OFN_FILEMUSTEXIST;
+        /* Require that the path to the parent directory exists.  */
+        file_details->Flags |= OFN_PATHMUSTEXIST;
+        /* If we are looking for a file, require that it exists.  */
+        if (NILP (only_dir_p))
+          file_details->Flags |= OFN_FILEMUSTEXIST;
       }
 
-    file_details->lpfnHook = (LPOFNHOOKPROC) file_dialog_callback;
-
-    file_opened = GetOpenFileName (file_details);
+    {
+      int count = SPECPDL_INDEX ();
+      /* Prevent redisplay.  */
+      specbind (Qinhibit_redisplay, Qt);
+      block_input ();
+      file_details->lpfnHook = file_dialog_callback;
 
-    unblock_input ();
+#ifdef NTGUI_UNICODE
+      file_opened = GetOpenFileNameW (file_details);
+#else /* !NTGUI_UNICODE */
+      file_opened = GetOpenFileNameA (file_details);
+#endif /* NTGUI_UNICODE */
+      unblock_input ();
+      unbind_to (count, Qnil);
+    }
 
     if (file_opened)
       {
-        dostounix_filename (filename);
-
-        if (file_details->nFilterIndex == 2)
-          {
-            /* "Directories" selected - strip dummy file name.  */
-            char * last = strrchr (filename, '/');
-            *last = '\0';
-          }
-
-        file = DECODE_FILE (build_string (filename));
+        /* Get an Emacs string from the value Windows gave us.  */
+#ifdef NTGUI_UNICODE
+        filename = from_unicode (
+          make_unibyte_string (
+            (char*) filename_buf,
+            /* we get one of the two final 0 bytes for free. */
+            1 + sizeof (wchar_t) * wcslen (filename_buf)));
+#else /* !NTGUI_UNICODE */
+        dostounix_filename (filename_buf);
+        filename = DECODE_FILE (build_string (filename_buf));
+#endif /* NTGUI_UNICODE */
+
+#ifdef CYGWIN
+        filename = Fcygwin_convert_path_from_windows (filename, Qt);
+#endif /* CYGWIN */
+
+        /* Strip the dummy filename off the end of the string if we
+           added it to select a directory.  */
+        if (file_details->nFilterIndex == 2)
+          {
+            filename = Ffile_name_directory (filename);
+          }
       }
     /* User canceled the dialog without making a selection.  */
     else if (!CommDlgExtendedError ())
-      file = Qnil;
+      filename = Qnil;
     /* An error occurred, fallback on reading from the mini-buffer.  */
     else
-      file = Fcompleting_read (prompt, intern ("read-file-name-internal"),
-                               dir, mustmatch, dir, Qfile_name_history,
-                               default_filename, Qnil);
+      filename = Fcompleting_read (
+        orig_prompt,
+        intern ("read-file-name-internal"),
+        orig_dir,
+        mustmatch,
+        orig_dir,
+        Qfile_name_history,
+        default_filename,
+        Qnil);
 
-    file = unbind_to (count, file);
+    UNGCPRO;
   }
 
-  UNGCPRO;
-
   /* Make "Cancel" equivalent to C-g.  */
-  if (NILP (file))
+  if (NILP (filename))
     Fsignal (Qquit, Qnil);
 
-  return unbind_to (count, file);
+  RETURN_UNGCPRO (filename);
 }
 
-
+
+#ifdef WINDOWSNT
 /* Moving files to the system recycle bin.
    Used by `move-file-to-trash' instead of the default moving to ~/.Trash  */
 DEFUN ("system-move-file-to-trash", Fsystem_move_file_to_trash,
@@ -6109,6 +6336,8 @@ DEFUN ("system-move-file-to-trash", Fsystem_move_file_to_trash,
   return Qnil;
 }
 
+#endif /* WINDOWSNT */
+
 
 /***********************************************************************
                          w32 specialized functions
@@ -6526,7 +6755,7 @@ The following %-sequences are provided:
       else
         {
           char buffer[16];
-          _snprintf (buffer, 16, "%d", system_status.BatteryLifePercent);
+          snprintf (buffer, 16, "%d", system_status.BatteryLifePercent);
           load_percentage = build_string (buffer);
         }
 
@@ -6537,18 +6766,18 @@ The following %-sequences are provided:
           long m;
           float h;
           char buffer[16];
-          _snprintf (buffer, 16, "%ld", seconds_left);
+          snprintf (buffer, 16, "%ld", seconds_left);
           seconds = build_string (buffer);
 
           m = seconds_left / 60;
-          _snprintf (buffer, 16, "%ld", m);
+          snprintf (buffer, 16, "%ld", m);
           minutes = build_string (buffer);
 
           h = seconds_left / 3600.0;
-          _snprintf (buffer, 16, "%3.1f", h);
+          snprintf (buffer, 16, "%3.1f", h);
           hours = build_string (buffer);
 
-          _snprintf (buffer, 16, "%ld:%02ld", m / 60, m % 60);
+          snprintf (buffer, 16, "%ld:%02ld", m / 60, m % 60);
           remain = build_string (buffer);
         }
 
@@ -6710,10 +6939,10 @@ DEFUN ("default-printer-name", Fdefault_printer_name, Sdefault_printer_name,
         {
           /* a remote printer */
           if (*ppi2->pServerName == '\\')
-            _snprintf (pname_buf, sizeof (pname_buf), "%s\\%s", ppi2->pServerName,
+            snprintf (pname_buf, sizeof (pname_buf), "%s\\%s", ppi2->pServerName,
                        ppi2->pShareName);
           else
-            _snprintf (pname_buf, sizeof (pname_buf), "\\\\%s\\%s", ppi2->pServerName,
+            snprintf (pname_buf, sizeof (pname_buf), "\\\\%s\\%s", ppi2->pServerName,
                        ppi2->pShareName);
           pname_buf[sizeof (pname_buf) - 1] = '\0';
         }
@@ -6732,6 +6961,292 @@ DEFUN ("default-printer-name", Fdefault_printer_name, Sdefault_printer_name,
   return build_string (pname_buf);
 }
 
+
+/* Equivalent of strerror for W32 error codes.  */
+char *
+w32_strerror (int error_no)
+{
+  static char buf[500];
+  DWORD ret;
+
+  if (error_no == 0)
+    error_no = GetLastError ();
+
+  ret = FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM |
+                       FORMAT_MESSAGE_IGNORE_INSERTS,
+                       NULL,
+                       error_no,
+                       0, /* choose most suitable language */
+                       buf, sizeof (buf), NULL);
+
+  while (ret > 0 && (buf[ret - 1] == '\n' ||
+                     buf[ret - 1] == '\r' ))
+      --ret;
+  buf[ret] = '\0';
+  if (!ret)
+    sprintf (buf, "w32 error %u", error_no);
+
+  return buf;
+}
+
+/* For convenience when debugging.  */
+int
+w32_last_error (void)
+{
+  return GetLastError ();
+}
+
+/* Cache information describing the NT system for later use.  */
+void
+cache_system_info (void)
+{
+  union
+    {
+      struct info
+        {
+          char  major;
+          char  minor;
+          short platform;
+        } info;
+      DWORD data;
+    } version;
+
+  /* Cache the version of the operating system.  */
+  version.data = GetVersion ();
+  w32_major_version = version.info.major;
+  w32_minor_version = version.info.minor;
+
+  if (version.info.platform & 0x8000)
+    os_subtype = OS_9X;
+  else
+    os_subtype = OS_NT;
+
+  /* Cache page size, allocation unit, processor type, etc.  */
+  GetSystemInfo (&sysinfo_cache);
+  syspage_mask = sysinfo_cache.dwPageSize - 1;
+
+  /* Cache os info.  */
+  osinfo_cache.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
+  GetVersionEx (&osinfo_cache);
+
+  w32_build_number = osinfo_cache.dwBuildNumber;
+  if (os_subtype == OS_9X)
+    w32_build_number &= 0xffff;
+
+  w32_num_mouse_buttons = GetSystemMetrics (SM_CMOUSEBUTTONS);
+}
+
+#ifdef EMACSDEBUG
+void
+_DebPrint (const char *fmt, ...)
+{
+  char buf[1024];
+  va_list args;
+
+  va_start (args, fmt);
+  vsprintf (buf, fmt, args);
+  va_end (args);
+#if CYGWIN
+  fprintf (stderr, "%s", buf);
+#endif
+  OutputDebugString (buf);
+}
+#endif
+
+int
+w32_console_toggle_lock_key (int vk_code, Lisp_Object new_state)
+{
+  int cur_state = (GetKeyState (vk_code) & 1);
+
+  if (NILP (new_state)
+      || (NUMBERP (new_state)
+          && ((XUINT (new_state)) & 1) != cur_state))
+    {
+#ifdef WINDOWSNT
+      faked_key = vk_code;
+#endif /* WINDOWSNT */
+
+      keybd_event ((BYTE) vk_code,
+                   (BYTE) MapVirtualKey (vk_code, 0),
+                   KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
+      keybd_event ((BYTE) vk_code,
+                   (BYTE) MapVirtualKey (vk_code, 0),
+                   KEYEVENTF_EXTENDEDKEY | 0, 0);
+      keybd_event ((BYTE) vk_code,
+                   (BYTE) MapVirtualKey (vk_code, 0),
+                   KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
+      cur_state = !cur_state;
+    }
+
+  return cur_state;
+}
+
+/* Translate console modifiers to emacs modifiers.
+   German keyboard support (Kai Morgan Zeise 2/18/95).  */
+int
+w32_kbd_mods_to_emacs (DWORD mods, WORD key)
+{
+  int retval = 0;
+
+  /* If we recognize right-alt and left-ctrl as AltGr, and it has been
+     pressed, first remove those modifiers.  */
+  if (!NILP (Vw32_recognize_altgr)
+      && (mods & (RIGHT_ALT_PRESSED | LEFT_CTRL_PRESSED))
+      == (RIGHT_ALT_PRESSED | LEFT_CTRL_PRESSED))
+    mods &= ~ (RIGHT_ALT_PRESSED | LEFT_CTRL_PRESSED);
+
+  if (mods & (RIGHT_ALT_PRESSED | LEFT_ALT_PRESSED))
+    retval = ((NILP (Vw32_alt_is_meta)) ? alt_modifier : meta_modifier);
+
+  if (mods & (RIGHT_CTRL_PRESSED | LEFT_CTRL_PRESSED))
+    {
+      retval |= ctrl_modifier;
+      if ((mods & (RIGHT_CTRL_PRESSED | LEFT_CTRL_PRESSED))
+          == (RIGHT_CTRL_PRESSED | LEFT_CTRL_PRESSED))
+        retval |= meta_modifier;
+    }
+
+  if (mods & LEFT_WIN_PRESSED)
+    retval |= w32_key_to_modifier (VK_LWIN);
+  if (mods & RIGHT_WIN_PRESSED)
+    retval |= w32_key_to_modifier (VK_RWIN);
+  if (mods & APPS_PRESSED)
+    retval |= w32_key_to_modifier (VK_APPS);
+  if (mods & SCROLLLOCK_ON)
+    retval |= w32_key_to_modifier (VK_SCROLL);
+
+  /* Just in case someone wanted the original behavior, make it
+     optional by setting w32-capslock-is-shiftlock to t.  */
+  if (NILP (Vw32_capslock_is_shiftlock)
+      /* Keys that should _not_ be affected by CapsLock.  */
+      && (    (key == VK_BACK)
+           || (key == VK_TAB)
+           || (key == VK_CLEAR)
+           || (key == VK_RETURN)
+           || (key == VK_ESCAPE)
+           || ((key >= VK_SPACE) && (key <= VK_HELP))
+           || ((key >= VK_NUMPAD0) && (key <= VK_F24))
+           || ((key >= VK_NUMPAD_CLEAR) && (key <= VK_NUMPAD_DELETE))
+         ))
+    {
+      /* Only consider shift state.  */
+      if ((mods & SHIFT_PRESSED) != 0)
+        retval |= shift_modifier;
+    }
+  else
+    {
+      /* Ignore CapsLock state if not enabled.  */
+      if (NILP (Vw32_enable_caps_lock))
+        mods &= ~CAPSLOCK_ON;
+      if ((mods & (SHIFT_PRESSED | CAPSLOCK_ON)) != 0)
+        retval |= shift_modifier;
+    }
+
+  return retval;
+}
+
+/* The return code indicates key code size.  cpID is the codepage to
+   use for translation to Unicode; -1 means use the current console
+   input codepage.  */
+int
+w32_kbd_patch_key (KEY_EVENT_RECORD *event, int cpId)
+{
+  unsigned int key_code = event->wVirtualKeyCode;
+  unsigned int mods = event->dwControlKeyState;
+  BYTE keystate[256];
+  static BYTE ansi_code[4];
+  static int isdead = 0;
+
+  if (isdead == 2)
+    {
+      event->uChar.AsciiChar = ansi_code[2];
+      isdead = 0;
+      return 1;
+    }
+  if (event->uChar.AsciiChar != 0)
+    return 1;
+
+  memset (keystate, 0, sizeof (keystate));
+  keystate[key_code] = 0x80;
+  if (mods & SHIFT_PRESSED)
+    keystate[VK_SHIFT] = 0x80;
+  if (mods & CAPSLOCK_ON)
+    keystate[VK_CAPITAL] = 1;
+  /* If we recognize right-alt and left-ctrl as AltGr, set the key
+     states accordingly before invoking ToAscii.  */
+  if (!NILP (Vw32_recognize_altgr)
+      && (mods & LEFT_CTRL_PRESSED) && (mods & RIGHT_ALT_PRESSED))
+    {
+      keystate[VK_CONTROL] = 0x80;
+      keystate[VK_LCONTROL] = 0x80;
+      keystate[VK_MENU] = 0x80;
+      keystate[VK_RMENU] = 0x80;
+    }
+
+#if 0
+  /* Because of an OS bug, ToAscii corrupts the stack when called to
+     convert a dead key in console mode on NT4.  Unfortunately, trying
+     to check for dead keys using MapVirtualKey doesn't work either -
+     these functions apparently use internal information about keyboard
+     layout which doesn't get properly updated in console programs when
+     changing layout (though apparently it gets partly updated,
+     otherwise ToAscii wouldn't crash).  */
+  if (is_dead_key (event->wVirtualKeyCode))
+    return 0;
+#endif
+
+  /* On NT, call ToUnicode instead and then convert to the current
+     console input codepage.  */
+  if (os_subtype == OS_NT)
+    {
+      WCHAR buf[128];
+
+      isdead = ToUnicode (event->wVirtualKeyCode, event->wVirtualScanCode,
+                          keystate, buf, 128, 0);
+      if (isdead > 0)
+        {
+          /* When we are called from the GUI message processing code,
+             we are passed the current keyboard codepage, a positive
+             number, to use below.  */
+          if (cpId == -1)
+            cpId = GetConsoleCP ();
+
+          event->uChar.UnicodeChar = buf[isdead - 1];
+          isdead = WideCharToMultiByte (cpId, 0, buf, isdead,
+                                        ansi_code, 4, NULL, NULL);
+        }
+      else
+        isdead = 0;
+    }
+  else
+    {
+      isdead = ToAscii (event->wVirtualKeyCode, event->wVirtualScanCode,
+                        keystate, (LPWORD) ansi_code, 0);
+    }
+
+  if (isdead == 0)
+    return 0;
+  event->uChar.AsciiChar = ansi_code[0];
+  return isdead;
+}
+
+
+void
+w32_sys_ring_bell (struct frame *f)
+{
+  if (sound_type == 0xFFFFFFFF)
+    {
+      Beep (666, 100);
+    }
+  else if (sound_type == MB_EMACS_SILENT)
+    {
+      /* Do nothing.  */
+    }
+  else
+    MessageBeep (sound_type);
+}
+
+
 /***********************************************************************
                             Initialization
  ***********************************************************************/
@@ -7098,6 +7613,7 @@ only be necessary if the default setting causes problems.  */);
 
   defsubr (&Sfile_system_info);
   defsubr (&Sdefault_printer_name);
+  defsubr (&Sset_message_beep);
 
   check_window_system_func = check_w32;
 
@@ -7114,7 +7630,9 @@ only be necessary if the default setting causes problems.  */);
   staticpro (&last_show_tip_args);
 
   defsubr (&Sx_file_dialog);
+#ifdef WINDOWSNT
   defsubr (&Ssystem_move_file_to_trash);
+#endif
 }
 
 
@@ -7196,9 +7714,3 @@ emacs_abort (void)
     }
 }
 
-/* For convenience when debugging.  */
-int
-w32_last_error (void)
-{
-  return GetLastError ();
-}
diff --git a/src/w32font.c b/src/w32font.c
index 833b7cdfb25..d7d25d89939 100644
--- a/src/w32font.c
+++ b/src/w32font.c
@@ -18,6 +18,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 #include <windows.h>
+#include <stdio.h>
 #include <math.h>
 #include <ctype.h>
 #include <commdlg.h>
@@ -1434,6 +1435,9 @@ w32font_coverage_ok (FONTSIGNATURE * coverage, BYTE charset)
   return 1;
 }
 
+#ifndef WINDOWSNT
+#define _strlwr strlwr
+#endif /* !WINDOWSNT */
 
 static int
 check_face_name (LOGFONT *font, char *full_name)
diff --git a/src/w32heap.c b/src/w32heap.c
index 8b9b19ea35d..0ff473fb0a8 100644
--- a/src/w32heap.c
+++ b/src/w32heap.c
@@ -32,10 +32,9 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 SYSTEM_INFO sysinfo_cache;
 
 /* This gives us version, build, and platform identification.  */
+extern unsigned long syspage_mask;
 OSVERSIONINFO osinfo_cache;
 
-size_t syspage_mask = 0;
-
 /* The major and minor versions of NT.  */
 int w32_major_version;
 int w32_minor_version;
@@ -44,44 +43,6 @@ int w32_build_number;
 /* Distinguish between Windows NT and Windows 95.  */
 int os_subtype;
 
-/* Cache information describing the NT system for later use.  */
-void
-cache_system_info (void)
-{
-  union
-    {
-      struct info
-        {
-          char  major;
-          char  minor;
-          short platform;
-        } info;
-      DWORD data;
-    } version;
-
-  /* Cache the version of the operating system.  */
-  version.data = GetVersion ();
-  w32_major_version = version.info.major;
-  w32_minor_version = version.info.minor;
-
-  if (version.info.platform & 0x8000)
-    os_subtype = OS_9X;
-  else
-    os_subtype = OS_NT;
-
-  /* Cache page size, allocation unit, processor type, etc.  */
-  GetSystemInfo (&sysinfo_cache);
-  syspage_mask = sysinfo_cache.dwPageSize - 1;
-
-  /* Cache os info.  */
-  osinfo_cache.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
-  GetVersionEx (&osinfo_cache);
-
-  w32_build_number = osinfo_cache.dwBuildNumber;
-  if (os_subtype == OS_9X)
-    w32_build_number &= 0xffff;
-}
-
 /* Emulate getpagesize.  */
 int
 getpagesize (void)
diff --git a/src/w32inevt.c b/src/w32inevt.c
index ebb95dcace5..c322d3a0b44 100644
--- a/src/w32inevt.c
+++ b/src/w32inevt.c
@@ -70,6 +70,9 @@ w32_read_console_input (HANDLE h, INPUT_RECORD *rec, DWORD recsize,
           : ReadConsoleInputA (h, rec, recsize, waiting));
 }
 
+/* Set by w32_console_toggle_lock_key.  */
+int faked_key;
+
 static int
 fill_queue (BOOL block)
 {
@@ -110,67 +113,7 @@ get_frame (void)
 
 /* Translate console modifiers to emacs modifiers.
    German keyboard support (Kai Morgan Zeise 2/18/95).  */
-int
-w32_kbd_mods_to_emacs (DWORD mods, WORD key)
-{
-  int retval = 0;
-
-  /* If we recognize right-alt and left-ctrl as AltGr, and it has been
-     pressed, first remove those modifiers.  */
-  if (!NILP (Vw32_recognize_altgr)
-      && (mods & (RIGHT_ALT_PRESSED | LEFT_CTRL_PRESSED))
-      == (RIGHT_ALT_PRESSED | LEFT_CTRL_PRESSED))
-    mods &= ~ (RIGHT_ALT_PRESSED | LEFT_CTRL_PRESSED);
 
-  if (mods & (RIGHT_ALT_PRESSED | LEFT_ALT_PRESSED))
-    retval = ((NILP (Vw32_alt_is_meta)) ? alt_modifier : meta_modifier);
-
-  if (mods & (RIGHT_CTRL_PRESSED | LEFT_CTRL_PRESSED))
-    {
-      retval |= ctrl_modifier;
-      if ((mods & (RIGHT_CTRL_PRESSED | LEFT_CTRL_PRESSED))
-          == (RIGHT_CTRL_PRESSED | LEFT_CTRL_PRESSED))
-        retval |= meta_modifier;
-    }
-
-  if (mods & LEFT_WIN_PRESSED)
-    retval |= w32_key_to_modifier (VK_LWIN);
-  if (mods & RIGHT_WIN_PRESSED)
-    retval |= w32_key_to_modifier (VK_RWIN);
-  if (mods & APPS_PRESSED)
-    retval |= w32_key_to_modifier (VK_APPS);
-  if (mods & SCROLLLOCK_ON)
-    retval |= w32_key_to_modifier (VK_SCROLL);
-
-  /* Just in case someone wanted the original behavior, make it
-     optional by setting w32-capslock-is-shiftlock to t.  */
-  if (NILP (Vw32_capslock_is_shiftlock)
-      /* Keys that should _not_ be affected by CapsLock.  */
-      && (    (key == VK_BACK)
-           || (key == VK_TAB)
-           || (key == VK_CLEAR)
-           || (key == VK_RETURN)
-           || (key == VK_ESCAPE)
-           || ((key >= VK_SPACE) && (key <= VK_HELP))
-           || ((key >= VK_NUMPAD0) && (key <= VK_F24))
-           || ((key >= VK_NUMPAD_CLEAR) && (key <= VK_NUMPAD_DELETE))
-         ))
-    {
-      /* Only consider shift state.  */
-      if ((mods & SHIFT_PRESSED) != 0)
-        retval |= shift_modifier;
-    }
-  else
-    {
-      /* Ignore CapsLock state if not enabled.  */
-      if (NILP (Vw32_enable_caps_lock))
-        mods &= ~CAPSLOCK_ON;
-      if ((mods & (SHIFT_PRESSED | CAPSLOCK_ON)) != 0)
-        retval |= shift_modifier;
-    }
-
-  return retval;
-}
 
 #if 0
 /* Return nonzero if the virtual key is a dead key.  */
@@ -187,90 +130,7 @@ is_dead_key (int wparam)
 /* The return code indicates key code size.  cpID is the codepage to
    use for translation to Unicode; -1 means use the current console
    input codepage.  */
-int
-w32_kbd_patch_key (KEY_EVENT_RECORD *event, int cpId)
-{
-  unsigned int key_code = event->wVirtualKeyCode;
-  unsigned int mods = event->dwControlKeyState;
-  BYTE keystate[256];
-  static BYTE ansi_code[4];
-  static int isdead = 0;
 
-  if (isdead == 2)
-    {
-      event->uChar.AsciiChar = ansi_code[2];
-      isdead = 0;
-      return 1;
-    }
-  if (event->uChar.AsciiChar != 0)
-    return 1;
-
-  memset (keystate, 0, sizeof (keystate));
-  keystate[key_code] = 0x80;
-  if (mods & SHIFT_PRESSED)
-    keystate[VK_SHIFT] = 0x80;
-  if (mods & CAPSLOCK_ON)
-    keystate[VK_CAPITAL] = 1;
-  /* If we recognize right-alt and left-ctrl as AltGr, set the key
-     states accordingly before invoking ToAscii.  */
-  if (!NILP (Vw32_recognize_altgr)
-      && (mods & LEFT_CTRL_PRESSED) && (mods & RIGHT_ALT_PRESSED))
-    {
-      keystate[VK_CONTROL] = 0x80;
-      keystate[VK_LCONTROL] = 0x80;
-      keystate[VK_MENU] = 0x80;
-      keystate[VK_RMENU] = 0x80;
-    }
-
-#if 0
-  /* Because of an OS bug, ToAscii corrupts the stack when called to
-     convert a dead key in console mode on NT4.  Unfortunately, trying
-     to check for dead keys using MapVirtualKey doesn't work either -
-     these functions apparently use internal information about keyboard
-     layout which doesn't get properly updated in console programs when
-     changing layout (though apparently it gets partly updated,
-     otherwise ToAscii wouldn't crash).  */
-  if (is_dead_key (event->wVirtualKeyCode))
-    return 0;
-#endif
-
-  /* On NT, call ToUnicode instead and then convert to the current
-     console input codepage.  */
-  if (os_subtype == OS_NT)
-    {
-      WCHAR buf[128];
-
-      isdead = ToUnicode (event->wVirtualKeyCode, event->wVirtualScanCode,
-                          keystate, buf, 128, 0);
-      if (isdead > 0)
-        {
-          /* When we are called from the GUI message processing code,
-             we are passed the current keyboard codepage, a positive
-             number, to use below.  */
-          if (cpId == -1)
-            cpId = GetConsoleCP ();
-
-          event->uChar.UnicodeChar = buf[isdead - 1];
-          isdead = WideCharToMultiByte (cpId, 0, buf, isdead,
-                                        ansi_code, 4, NULL, NULL);
-        }
-      else
-        isdead = 0;
-    }
-  else
-    {
-      isdead = ToAscii (event->wVirtualKeyCode, event->wVirtualScanCode,
-                        keystate, (LPWORD) ansi_code, 0);
-    }
-
-  if (isdead == 0)
-    return 0;
-  event->uChar.AsciiChar = ansi_code[0];
-  return isdead;
-}
-
-
-static int faked_key = 0;
 
 /* return code -1 means that event_queue_ptr won't be incremented.
    In other word, this event makes two key codes.   (by himi)       */
@@ -531,32 +391,6 @@ key_event (KEY_EVENT_RECORD *event, struct input_event *emacs_ev, int *isdead)
   return 1;
 }
 
-int
-w32_console_toggle_lock_key (int vk_code, Lisp_Object new_state)
-{
-  int cur_state = (GetKeyState (vk_code) & 1);
-
-  if (NILP (new_state)
-      || (NUMBERP (new_state)
-          && ((XUINT (new_state)) & 1) != cur_state))
-    {
-      faked_key = vk_code;
-
-      keybd_event ((BYTE) vk_code,
-                   (BYTE) MapVirtualKey (vk_code, 0),
-                   KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
-      keybd_event ((BYTE) vk_code,
-                   (BYTE) MapVirtualKey (vk_code, 0),
-                   KEYEVENTF_EXTENDEDKEY | 0, 0);
-      keybd_event ((BYTE) vk_code,
-                   (BYTE) MapVirtualKey (vk_code, 0),
-                   KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
-      cur_state = !cur_state;
-    }
-
-  return cur_state;
-}
-
 /* Mouse position hook.  */
 void
 w32_console_mouse_position (FRAME_PTR *f,
diff --git a/src/w32menu.c b/src/w32menu.c
index 0a10f1f0893..40ee82d42d5 100644
--- a/src/w32menu.c
+++ b/src/w32menu.c
@@ -21,7 +21,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <signal.h>
 #include <stdio.h>
-#include <mbstring.h>
+#include <setjmp.h>
 
 #include "lisp.h"
 #include "keyboard.h"
@@ -40,6 +40,14 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
    if this is not done before the other system files.  */
 #include "w32term.h"
 
+/* Cygwin does not support the multibyte string functions declared in
+ * mbstring.h below --- but that's okay: because Cygwin is
+ * UNICODE-only, we don't need to use these functions anyway.  */
+
+#ifndef NTGUI_UNICODE
+#include <mbstring.h>
+#endif /* !NTGUI_UNICODE */
+
 /* Load sys/types.h if not already loaded.
    In some systems loading it twice is suicidal.  */
 #ifndef makedev
@@ -78,10 +86,17 @@ typedef int (WINAPI * MessageBoxW_Proc) (
     IN WCHAR *caption,
     IN UINT type);
 
+#ifdef NTGUI_UNICODE
+#define get_menu_item_info GetMenuItemInfoA
+#define set_menu_item_info SetMenuItemInfoA
+#define unicode_append_menu AppendMenuW
+#define unicode_message_box MessageBoxW
+#else /* !NTGUI_UNICODE */
 GetMenuItemInfoA_Proc get_menu_item_info = NULL;
 SetMenuItemInfoA_Proc set_menu_item_info = NULL;
 AppendMenuW_Proc unicode_append_menu = NULL;
 MessageBoxW_Proc unicode_message_box = NULL;
+#endif /* NTGUI_UNICODE */
 
 Lisp_Object Qdebug_on_next_call;
 
@@ -98,6 +113,7 @@ static void utf8to16 (unsigned char *, int, WCHAR *);
 static int fill_in_menu (HMENU, widget_value *);
 
 void w32_free_menu_strings (HWND);
+
 
 
 /* This is set nonzero after the user activates the menu bar, and set
@@ -1405,6 +1421,7 @@ add_menu_item (HMENU menu, widget_value *wv, HMENU item)
                 nlen++;
             }
         }
+#ifndef NTGUI_UNICODE
       else
         {
           /* If encoded with the system codepage, use multibyte string
@@ -1415,6 +1432,7 @@ add_menu_item (HMENU menu, widget_value *wv, HMENU item)
                 nlen++;
             }
         }
+#endif /* !NTGUI_UNICODE */
 
       if (nlen > orig_len)
         {
@@ -1429,6 +1447,7 @@ add_menu_item (HMENU menu, widget_value *wv, HMENU item)
                     *q++ = *p;
                   *q++ = *p++;
                 }
+#ifndef NTGUI_UNICODE
               else
                 {
                   if (_mbsnextc (p) == '&')
@@ -1440,6 +1459,7 @@ add_menu_item (HMENU menu, widget_value *wv, HMENU item)
                   p = _mbsinc (p);
                   q = _mbsinc (q);
                 }
+#endif /* !NTGUI_UNICODE */
             }
           *q = '\0';
         }
@@ -1486,6 +1506,8 @@ add_menu_item (HMENU menu, widget_value *wv, HMENU item)
                                           item != NULL ? (UINT_PTR) item
                                             : (UINT_PTR) wv->call_data,
                                           utf16_string);
+
+#ifndef NTGUI_UNICODE /* Fallback does not apply when always UNICODE */
       if (!return_value)
         {
           /* On W9x/ME, Unicode menus are not supported, though AppendMenuW
@@ -1504,6 +1526,7 @@ add_menu_item (HMENU menu, widget_value *wv, HMENU item)
           if (osinfo_cache.dwPlatformId != VER_PLATFORM_WIN32_NT)
             unicode_append_menu = NULL;
         }
+#endif /* NTGUI_UNICODE */
 
       if (unicode_append_menu && (fuFlags & MF_OWNERDRAW))
         local_free (out_string);
@@ -1723,10 +1746,12 @@ syms_of_w32menu (void)
 void
 globals_of_w32menu (void)
 {
+#ifndef NTGUI_UNICODE
   /* See if Get/SetMenuItemInfo functions are available.  */
   HMODULE user32 = GetModuleHandle ("user32.dll");
   get_menu_item_info = (GetMenuItemInfoA_Proc) GetProcAddress (user32, "GetMenuItemInfoA");
   set_menu_item_info = (SetMenuItemInfoA_Proc) GetProcAddress (user32, "SetMenuItemInfoA");
   unicode_append_menu = (AppendMenuW_Proc) GetProcAddress (user32, "AppendMenuW");
   unicode_message_box = (MessageBoxW_Proc) GetProcAddress (user32, "MessageBoxW");
+#endif /* !NTGUI_UNICODE */
 }
diff --git a/src/w32proc.c b/src/w32proc.c
index d032b21c59e..7d0039d0d5e 100644
--- a/src/w32proc.c
+++ b/src/w32proc.c
@@ -67,20 +67,6 @@ extern BOOL WINAPI IsValidLocale (LCID, DWORD);
 
 Lisp_Object Qhigh, Qlow;
 
-#ifdef EMACSDEBUG
-void
-_DebPrint (const char *fmt, ...)
-{
-  char buf[1024];
-  va_list args;
-
-  va_start (args, fmt);
-  vsprintf (buf, fmt, args);
-  va_end (args);
-  OutputDebugString (buf);
-}
-#endif
-
 typedef void (_CALLBACK_ *signal_handler) (int);
 
 /* Signal handlers...SIG_DFL == 0 so this is initialized correctly.  */
diff --git a/src/w32select.c b/src/w32select.c
index 66f9f7ab041..1690c3b7824 100644
--- a/src/w32select.c
+++ b/src/w32select.c
@@ -81,6 +81,11 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "coding.h"
 #include "composite.h"
 
+#ifdef CYGWIN
+#include <string.h>
+#include <stdio.h>
+#define _memccpy memccpy
+#endif
 
 static HGLOBAL convert_to_handle_as_ascii (void);
 static HGLOBAL convert_to_handle_as_coded (Lisp_Object coding_system);
diff --git a/src/w32select.h b/src/w32select.h
new file mode 100644
index 00000000000..6924d4d51ae
--- /dev/null
+++ b/src/w32select.h
@@ -0,0 +1,30 @@
+/* Selection processing for Emacs on the Microsoft W32 API.
+
+Copyright (C) 1993-1994, 2001-2011  Free Software Foundation, Inc.
+
+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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef W32SELECT_H
+#define W32SELECT_H
+#include <windows.h>
+
+#define HAVE_W32SELECT 1
+
+extern void syms_of_w32select (void);
+extern void globals_of_w32select (void);
+extern void term_w32select (void);
+
+#endif
diff --git a/src/w32term.c b/src/w32term.c
index 71e6c7235a1..b18d07135ed 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -51,7 +51,14 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "atimer.h"
 #include "keymap.h"
 
+#ifdef WINDOWSNT
 #include "w32heap.h"
+#endif
+
+#ifndef WINDOWSNT
+#include <io.h> /* for get_osfhandle */
+#endif
+
 #include <shellapi.h>
 
 #include "font.h"
@@ -121,7 +128,7 @@ typedef struct tagGLYPHSET
   WCRANGE ranges[1];
 } GLYPHSET;
 
-#endif
+#endif /* compiling for pre-Win2k */
 
 /* Dynamic linking to SetLayeredWindowAttribute (only since 2000).  */
 BOOL (WINAPI *pfnSetLayeredWindowAttributes) (HWND, COLORREF, BYTE, DWORD);
@@ -190,6 +197,13 @@ static int volatile input_signal_count;
 static int input_signal_count;
 #endif
 
+#ifdef CYGWIN
+int w32_message_fd = -1;
+#endif /* CYGWIN */
+
+/* Keyboard code page - may be changed by language-change events.  */
+static int keyboard_codepage;
+
 static void x_update_window_end (struct window *, int, int);
 static void w32_handle_tool_bar_click (struct frame *,
                                        struct input_event *);
@@ -4256,6 +4270,9 @@ static char dbcs_lead = 0;
    This routine is called by the SIGIO handler.
    We return as soon as there are no more events to be read.
 
+   For an overview of how Emacs input works on MS-Windows, see the
+   commentary before w32_msg_pump in w32fns.c.
+
    We return the number of characters stored into the buffer,
    thus pretending to be `read'.
 
@@ -4278,18 +4295,26 @@ w32_read_socket (struct terminal *terminal,
   struct frame *f;
   struct w32_display_info *dpyinfo = &one_w32_display_info;
   Mouse_HLInfo *hlinfo = &dpyinfo->mouse_highlight;
+  static char buf[1];
 
   block_input ();
 
   /* So people can tell when we have read the available input.  */
   input_signal_count++;
 
+  /* Process any incoming thread messages.  */
+  drain_message_queue ();
+
   /* TODO: ghostscript integration. */
   while (get_next_msg (&msg, FALSE))
     {
       struct input_event inev;
       int do_help = 0;
 
+      /* DebPrint (("w32_read_socket: %s time:%u\n", */
+      /*            w32_name_of_message (msg.msg.message), */
+      /*            msg.msg.time)); */
+
       EVENT_INIT (inev);
       inev.kind = NO_EVENT;
       inev.arg = Qnil;
@@ -6428,8 +6453,15 @@ w32_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
     w32_defined_color (0, "black", &color, 1);
   }
 
-  /* Add the default keyboard.  */
+#ifdef WINDOWSNT
+  /* Add the default keyboard.  When !WINDOWSNT, we're using the
+     standard Emacs console handling machinery and don't need an
+     explicit FD here.  */
   add_keyboard_wait_descriptor (0);
+#elif CYGWIN
+  /* /dev/windows wakes us up when we have a thread message pending.  */
+  add_keyboard_wait_descriptor (w32_message_fd);
+#endif
 
   /* Create Fringe Bitmaps and store them for later use.
 
@@ -6440,15 +6472,6 @@ w32_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
      the bitmaps.  */
   w32_init_fringe (terminal->rif);
 
-#ifdef F_SETOWN
-  fcntl (connection, F_SETOWN, getpid ());
-#endif /* ! defined (F_SETOWN) */
-
-#ifdef SIGIO
-  if (interrupt_input)
-    init_sigio (connection);
-#endif /* ! defined (SIGIO) */
-
   unblock_input ();
 
   return dpyinfo;
@@ -6498,6 +6521,7 @@ x_delete_display (struct w32_display_info *dpyinfo)
 
   w32_reset_fringes ();
 }
+
 
 /* Set up use of W32.  */
 
@@ -6535,6 +6559,11 @@ w32_initialize (void)
         set_user_model (L"GNU.Emacs");
     }
 
+#ifdef CYGWIN
+  if ((w32_message_fd = open ("/dev/windows", O_RDWR | O_CLOEXEC)) == -1)
+    fatal ("opening /dev/windows: %s", strerror (errno));
+#endif /* CYGWIN */
+
   /* Initialize w32_use_visible_system_caret based on whether a screen
      reader is in use.  */
   if (!SystemParametersInfo (SPI_GETSCREENREADER, 0,
@@ -6701,4 +6730,6 @@ With MS Windows or Nextstep, the value is t.  */);
 
   staticpro (&last_mouse_motion_frame);
   last_mouse_motion_frame = Qnil;
+
+  Fprovide (intern_c_string ("w32"), Qnil);
 }
diff --git a/src/w32term.h b/src/w32term.h
index 75537458981..6e4f8594d67 100644
--- a/src/w32term.h
+++ b/src/w32term.h
@@ -19,6 +19,8 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 /* Added by Kevin Gallo */
 
 #include "w32gui.h"
+#include "frame.h"
+#include "atimer.h"
 
 
 #define BLACK_PIX_DEFAULT(f) PALETTERGB(0,0,0)
@@ -195,11 +197,45 @@ Lisp_Object display_x_get_resource (struct w32_display_info *,
                                     Lisp_Object, Lisp_Object,
                                     Lisp_Object, Lisp_Object);
 
+extern void x_focus_on_frame (struct frame *f);
+
+/* also defined in xterm.h XXX: factor out to common header */
+
 extern struct w32_display_info *w32_term_init (Lisp_Object,
                                                char *, char *);
-
+extern void check_w32 (void);
+extern int w32_defined_color (FRAME_PTR f, const char *color,
+                              XColor *color_def, int alloc);
+extern void x_set_window_size (struct frame *f, int change_grav,
+                              int cols, int rows);
 extern int x_display_pixel_height (struct w32_display_info *);
 extern int x_display_pixel_width (struct w32_display_info *);
+extern void x_sync (struct frame *);
+extern Lisp_Object x_get_focus_frame (struct frame *);
+extern void x_set_mouse_position (struct frame *f, int h, int v);
+extern void x_set_mouse_pixel_position (struct frame *f, int pix_x, int pix_y);
+extern void x_make_frame_visible (struct frame *f);
+extern void x_make_frame_invisible (struct frame *f);
+extern void x_iconify_frame (struct frame *f);
+extern int x_char_width (struct frame *f);
+extern int x_char_height (struct frame *f);
+extern int x_pixel_width (struct frame *f);
+extern int x_pixel_height (struct frame *f);
+extern void x_set_frame_alpha (struct frame *f);
+extern void x_set_menu_bar_lines (struct frame *, Lisp_Object, Lisp_Object);
+extern void x_set_tool_bar_lines (struct frame *f,
+                                  Lisp_Object value,
+                                  Lisp_Object oldval);
+extern void x_activate_menubar (struct frame *);
+extern int x_bitmap_icon (struct frame *, Lisp_Object);
+extern void initialize_frame_menubar (struct frame *);
+extern void x_free_frame_resources (struct frame *);
+extern void x_real_positions (struct frame *, int *, int *);
+
+/* w32inevt.c */
+extern int w32_kbd_patch_key (KEY_EVENT_RECORD *event, int cpId);
+extern int w32_kbd_mods_to_emacs (DWORD mods, WORD key);
+
 
 extern Lisp_Object x_get_focus_frame (struct frame *);
 
@@ -584,8 +620,9 @@ do { \
 #define WM_EMACS_SETCURSOR             (WM_EMACS_START + 19)
 #define WM_EMACS_PAINT                 (WM_EMACS_START + 20)
 #define WM_EMACS_BRINGTOTOP            (WM_EMACS_START + 21)
-#define WM_EMACS_FILENOTIFY            (WM_EMACS_START + 22)
-#define WM_EMACS_END                   (WM_EMACS_START + 23)
+#define WM_EMACS_INPUT_READY           (WM_EMACS_START + 22)
+#define WM_EMACS_FILENOTIFY            (WM_EMACS_START + 23)
+#define WM_EMACS_END                   (WM_EMACS_START + 24)
 
 #define WND_FONTWIDTH_INDEX    (0)
 #define WND_LINEHEIGHT_INDEX   (4)
@@ -607,6 +644,8 @@ typedef struct W32Msg {
     RECT rect;
 } W32Msg;
 
+extern BOOL prepend_msg (W32Msg *lpmsg);
+
 /* Structure for recording message when input thread must return a
    result that depends on lisp thread to compute.  Lisp thread can
    complete deferred messages out of order.  */
@@ -715,3 +754,19 @@ extern HWND w32_system_caret_hwnd;
 extern int w32_system_caret_height;
 extern int w32_system_caret_x;
 extern int w32_system_caret_y;
+
+#if EMACSDEBUG
+extern const char*
+w32_name_of_message (UINT msg);
+#endif /* EMACSDEBUG */
+
+extern void syms_of_w32term (void);
+extern void syms_of_w32menu (void);
+extern void syms_of_w32fns (void);
+
+extern void globals_of_w32menu (void);
+extern void globals_of_w32fns (void);
+
+#ifdef CYGWIN
+extern int w32_message_fd;
+#endif /* CYGWIN */
diff --git a/src/w32xfns.c b/src/w32xfns.c
index 018dd14cb80..cb452571665 100644
--- a/src/w32xfns.c
+++ b/src/w32xfns.c
@@ -19,6 +19,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <config.h>
 #include <signal.h>
 #include <stdio.h>
+
 #include "lisp.h"
 #include "keyboard.h"
 #include "frame.h"
@@ -32,7 +33,11 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #define myfree(lp) GlobalFreePtr (lp)
 
 CRITICAL_SECTION critsect;
+
+#ifdef WINDOWSNT
 extern HANDLE keyboard_handle;
+#endif /* WINDOWSNT */
+
 HANDLE input_available = NULL;
 HANDLE interrupt_handle = NULL;
 
@@ -43,7 +48,11 @@ init_crit (void)
 
   /* For safety, input_available should only be reset by get_next_msg
      when the input queue is empty, so make it a manual reset event. */
-  keyboard_handle = input_available = CreateEvent (NULL, TRUE, FALSE, NULL);
+  input_available = CreateEvent (NULL, TRUE, FALSE, NULL);
+
+#ifdef WINDOWSNT
+  keyboard_handle = input_available;
+#endif /* WINDOWSNT */
 
   /* interrupt_handle is signaled when quit (C-g) is detected, so that
      blocking system calls can be interrupted.  We make it a manual
@@ -240,6 +249,22 @@ get_next_msg (W32Msg * lpmsg, BOOL bWait)
   return (bRet);
 }
 
+extern char * w32_strerror (int error_no);
+
+/* Tell the main thread that we have input available; if the main
+   thread is blocked in select(), we wake it up here.  */
+static void
+notify_msg_ready (void)
+{
+  SetEvent (input_available);
+
+#ifdef CYGWIN
+  /* Wakes up the main thread, which is blocked select()ing for /dev/windows,
+     among other files.  */
+  (void) PostThreadMessage (dwMainThreadId, WM_EMACS_INPUT_READY, 0, 0);
+#endif /* CYGWIN */
+}
+
 BOOL
 post_msg (W32Msg * lpmsg)
 {
@@ -263,8 +288,7 @@ post_msg (W32Msg * lpmsg)
     }
 
   lpTail = lpNew;
-  SetEvent (input_available);
-
+  notify_msg_ready ();
   leave_crit ();
 
   return (TRUE);
@@ -285,7 +309,7 @@ prepend_msg (W32Msg *lpmsg)
   nQueue++;
   lpNew->lpNext = lpHead;
   lpHead = lpNew;
-
+  notify_msg_ready ();
   leave_crit ();
 
   return (TRUE);
diff --git a/src/window.c b/src/window.c
index 3b974616e38..61d2a8b073f 100644
--- a/src/window.c
+++ b/src/window.c
@@ -43,7 +43,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #ifdef HAVE_X_WINDOWS
 #include "xterm.h"
 #endif  /* HAVE_X_WINDOWS */
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
 #include "w32term.h"
 #endif
 #ifdef MSDOS
diff --git a/src/xdisp.c b/src/xdisp.c
index 635e7ecd0b2..2047c0e78c1 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -302,7 +302,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #ifdef HAVE_X_WINDOWS
 #include "xterm.h"
 #endif
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
 #include "w32term.h"
 #endif
 #ifdef HAVE_NS
diff --git a/src/xfaces.c b/src/xfaces.c
index f861dde2d15..3e6e9dc8ec0 100644
--- a/src/xfaces.c
+++ b/src/xfaces.c
@@ -227,13 +227,13 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #ifdef HAVE_WINDOW_SYSTEM
 #include TERM_HEADER
 #include "fontset.h"
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
 #undef FRAME_X_DISPLAY_INFO
 #define FRAME_X_DISPLAY_INFO FRAME_W32_DISPLAY_INFO
 #define x_display_info w32_display_info
 #define check_x check_w32
 #define GCGraphicsExposures 0
-#endif /* WINDOWSNT */
+#endif /* HAVE_NTGUI */
 
 #ifdef HAVE_NS
 #undef FRAME_X_DISPLAY_INFO
@@ -625,7 +625,7 @@ x_free_gc (struct frame *f, GC gc)
 
 #endif /* HAVE_X_WINDOWS */
 
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
 /* W32 emulation of GCs */
 
 static GC
@@ -649,7 +649,7 @@ x_free_gc (struct frame *f, GC gc)
   xfree (gc);
 }
 
-#endif  /* WINDOWSNT */
+#endif  /* HAVE_NTGUI */
 
 #ifdef HAVE_NS
 /* NS emulation of GCs */
@@ -719,7 +719,7 @@ init_frame_faces (struct frame *f)
 #ifdef HAVE_X_WINDOWS
   if (!FRAME_X_P (f) || FRAME_X_WINDOW (f))
 #endif
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
   if (!FRAME_WINDOW_P (f) || FRAME_W32_WINDOW (f))
 #endif
 #ifdef HAVE_NS
@@ -1098,7 +1098,7 @@ defined_color (struct frame *f, const char *color_name, XColor *color_def,
   else if (FRAME_X_P (f))
     return x_defined_color (f, color_name, color_def, alloc);
 #endif
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
   else if (FRAME_W32_P (f))
     return w32_defined_color (f, color_name, color_def, alloc);
 #endif
@@ -3245,7 +3245,7 @@ FRAME 0 means change the face on all frames, and change the default
             param = Qbackground_color;
         }
 #ifdef HAVE_WINDOW_SYSTEM
-#ifndef WINDOWSNT
+#ifndef HAVE_NTGUI
       else if (EQ (face, Qscroll_bar))
         {
           /* Changing the colors of `scroll-bar' sets frame parameters
@@ -3255,7 +3255,7 @@ FRAME 0 means change the face on all frames, and change the default
           else if (EQ (attr, QCbackground))
             param = Qscroll_bar_background;
         }
-#endif /* not WINDOWSNT */
+#endif /* not HAVE_NTGUI */
       else if (EQ (face, Qborder))
         {
           /* Changing background color of `border' sets frame parameter
@@ -6362,7 +6362,7 @@ where R,G,B are numbers between 0 and 255 and name is an arbitrary string.  */)
             if (num >= 0 && name[num] == '\n')
               name[num] = 0;
             cmap = Fcons (Fcons (build_string (name),
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
                                  make_number (RGB (red, green, blue))),
 #else
                                  make_number ((red << 16) | (green << 8) | blue)),