Bring up the Android operating system and its window system

* .dir-locals.el (c-mode): Add ANDROID_EXPORT noise macro.
* .gitignore: Add new files to ignore.
* Makefile.in: Adjust for Android.
* admin/merge-gnulib: Add new warning.
* configure.ac: Detect Android.  Run cross-configuration for
Android when appropriate.

* etc/DEBUG: Document how to debug Emacs on Android.

* java/AndroidManifest.xml:
* java/Makefile.in:
* java/README:
* java/debug.sh:
* java/org/gnu/emacs/EmacsActivity.java (EmacsActivity):
* java/org/gnu/emacs/EmacsApplication.java (EmacsApplication):
* java/org/gnu/emacs/EmacsCopyArea.java (EmacsCopyArea):
* java/org/gnu/emacs/EmacsDrawLine.java (EmacsDrawLine):
* java/org/gnu/emacs/EmacsDrawPoint.java (EmacsDrawPoint):
* java/org/gnu/emacs/EmacsDrawRectangle.java
(EmacsDrawRectangle):
* java/org/gnu/emacs/EmacsDrawable.java (EmacsDrawable):
* java/org/gnu/emacs/EmacsFillPolygon.java (EmacsFillPolygon):
* java/org/gnu/emacs/EmacsFillRectangle.java
(EmacsFillRectangle):
* java/org/gnu/emacs/EmacsFontDriver.java (EmacsFontDriver):
* java/org/gnu/emacs/EmacsGC.java (EmacsGC):
* java/org/gnu/emacs/EmacsHandleObject.java (EmacsHandleObject):
* java/org/gnu/emacs/EmacsNative.java (EmacsNative):
* java/org/gnu/emacs/EmacsPaintQueue.java (EmacsPaintQueue):
* java/org/gnu/emacs/EmacsPaintReq.java (EmacsPaintReq):
* java/org/gnu/emacs/EmacsPixmap.java (EmacsPixmap):
* java/org/gnu/emacs/EmacsSdk7FontDriver.java
(EmacsSdk7FontDriver):
* java/org/gnu/emacs/EmacsService.java (class Holder<T>)
(EmacsService):
* java/org/gnu/emacs/EmacsSurfaceView.java (EmacsSurfaceView):
* java/org/gnu/emacs/EmacsThread.java (EmacsThread):
* java/org/gnu/emacs/EmacsView.java (EmacsView):
* java/org/gnu/emacs/EmacsWindow.java (EmacsWindow): New files
and classes.

* lib-src/Makefile.in (srcdir):
* lib/Makefile.in (VPATH):
(HAVE_NATIVE_COMP):
(libgnu_a_SOURCES):
(DEPFLAGS): Configure correctly for cross-compiling.

* lib/faccessat.c:
* lib/fpending.c (__fpending):
* lib/open.c:
* lib/unistd.c (_GL_UNISTD_INLINE): Temporary adjustments to
gnulib.

* lisp/frame.el (display-graphic-p):
(display-screens):
(display-pixel-height):
(display-pixel-width):
(display-mm-height):
(display-mm-width):
(display-backing-store):
(display-save-under):
(display-planes):
(display-color-cells):
(display-visual-class): Adjust for new window system `android'.

* lisp/image/wallpaper.el (x-open-connection): Add declaration.
* lisp/loadup.el (featurep): Load up files for Android.
* lisp/net/eww.el (eww-form-submit, eww-form-file)
(eww-form-checkbox, eww-form-select): Adjust faces for android.
* lisp/term/android-win.el: New file.
* src/Makefile.in: Add new targets emacs.so and android-emacs,
then adjust for cross compilation.
* src/alloc.c (cleanup_vector): Clean up Android font entities
as well.
(garbage_collect): Mark androidterm.
* src/android-emacs.c (main):
* src/android.c (ANDROID_THROW, enum android_fd_table_entry_flags)
(struct android_emacs_service, struct android_emacs_pixmap)
(struct android_graphics_point, struct android_event_container)
(struct android_event_queue, android_run_select_thread)
(android_handle_sigusr1, android_init_events, android_pending)
(android_next_event, android_write_event, android_select)
(android_run_debug_thread, android_user_full_name)
(android_get_asset_name, android_fstat, android_fstatat)
(android_file_access_p, android_hack_asset_fd, android_open)
(android_close, JNICALL, android_init_emacs_service)
(android_init_emacs_pixmap, android_init_graphics_point)
(MAX_HANDLE, struct android_handle_entry, android_alloc_id)
(android_destroy_handle, android_resolve_handle)
(android_resolve_handle2, android_change_window_attributes)
(android_create_window, android_set_window_background)
(android_destroy_window, android_init_android_rect_class)
(android_init_emacs_gc_class, android_create_gc, android_free_gc)
(android_change_gc, android_set_clip_rectangles)
(android_reparent_window, android_lookup_method)
(android_clear_window, android_map_window, android_unmap_window)
(android_resize_window, android_move_window, android_swap_buffers)
(android_get_gc_values, android_set_foreground)
(android_fill_rectangle, android_create_pixmap_from_bitmap_data)
(android_set_clip_mask, android_set_fill_style, android_copy_area)
(android_free_pixmap, android_set_background, android_fill_polygon)
(android_draw_rectangle, android_draw_point, android_draw_line)
(android_create_pixmap, android_set_ts_origin, android_clear_area):
* src/android.h (ANDROID_EXPORT):
* src/androidfns.c (android_display_info_for_name)
(check_android_display_info, check_x_display_info, gamma_correct)
(android_defined_color, android_decode_color)
(android_implicitly_set_name, android_explicitly_set_name)
(android_set_tool_bar_lines, android_change_tool_bar_height)
(android_set_tab_bar_lines, android_change_tab_bar_height)
(android_set_scroll_bar_default_height)
(android_set_scroll_bar_default_width, android_icon_verify)
(android_icon, android_make_gc, android_free_gcs)
(unwind_create_frame, do_unwind_create_frame)
(android_default_font_parameter, android_create_frame_window)
(Fx_create_frame, Fxw_color_defined_p, Fxw_color_values)
(Fxw_display_color_p, Fx_display_grayscale_p)
(Fx_display_pixel_width, Fx_display_pixel_height)
(Fx_display_planes, Fx_display_color_cells, Fx_display_screens)
(Fx_display_mm_width, Fx_display_mm_height)
(Fx_display_backing_store, Fx_display_visual_class)
(Fx_display_monitor_attributes_list, Fx_frame_geometry)
(Fx_frame_list_z_order, Fx_frame_restack)
(Fx_mouse_absolute_pixel_position)
(Fx_set_mouse_absolute_pixel_position, Fandroid_get_connection)
(Fx_display_list, Fx_show_tip, Fx_hide_tip)
(android_set_background_color, android_set_border_color)
(android_set_cursor_color, android_set_cursor_type)
(android_set_foreground_color)
(android_set_child_frame_border_width)
(android_set_internal_border_width, android_set_menu_bar_lines)
(android_set_mouse_color, android_set_title, android_set_alpha)
(android_frame_parm_handlers, syms_of_androidfns):
* src/androidfont.c (struct android_emacs_font_driver)
(struct android_emacs_font_spec, struct android_emacs_font_metrics)
(struct android_emacs_font_object, struct android_integer)
(struct androidfont_info, struct androidfont_entity)
(android_init_font_driver, android_init_font_spec)
(android_init_font_metrics, android_init_integer)
(android_init_font_object, androidfont_get_cache)
(androidfont_from_lisp, androidfont_from_java, androidfont_list)
(androidfont_match, androidfont_draw, androidfont_open_font)
(androidfont_close_font, androidfont_has_char)
(androidfont_encode_char, androidfont_text_extents)
(androidfont_list_family, androidfont_driver)
(syms_of_androidfont_for_pdumper, syms_of_androidfont)
(init_androidfont, android_finalize_font_entity):
* src/androidgui.h (_ANDROID_GUI_H_, struct android_rectangle)
(struct android_point, enum android_gc_function)
(enum android_gc_value_mask, enum android_fill_style)
(enum android_window_value_mask)
(struct android_set_window_attributes, struct android_gc_values)
(struct android_gc, enum android_swap_action, enum android_shape)
(enum android_coord_mode, struct android_swap_info)
(NativeRectangle, struct android_any_event)
(struct android_key_event, struct android_configure_event)
(union android_event):
* src/androidterm.c (android_window_to_frame, android_clear_frame)
(android_ring_bell, android_toggle_invisible_pointer)
(android_update_begin, android_update_end, show_back_buffer)
(android_flush_dirty_back_buffer_on, handle_one_android_event)
(android_read_socket, android_frame_up_to_date)
(android_buffer_flipping_unblocked_hook)
(android_query_frame_background_color, android_parse_color)
(android_alloc_nearest_color, android_query_colors)
(android_mouse_position, android_get_focus_frame)
(android_focus_frame, android_frame_rehighlight)
(android_frame_raise_lower, android_make_frame_visible)
(android_make_frame_invisible)
(android_make_frame_visible_invisible, android_fullscreen_hook)
(android_iconify_frame, android_set_window_size_1)
(android_set_window_size, android_set_offset, android_set_alpha)
(android_new_font, android_bitmap_icon, android_free_pixmap_hook)
(android_free_frame_resources, android_delete_frame)
(android_delete_terminal, android_scroll_run)
(android_after_update_window_line, android_flip_and_flush)
(android_clear_rectangle, android_reset_clip_rectangles)
(android_clip_to_row, android_draw_fringe_bitmap)
(android_set_cursor_gc, android_set_mouse_face_gc)
(android_set_mode_line_face_gc, android_set_glyph_string_gc)
(android_set_glyph_string_clipping)
(android_set_glyph_string_clipping_exactly)
(android_compute_glyph_string_overhangs)
(android_clear_glyph_string_rect)
(android_draw_glyph_string_background, android_fill_triangle)
(android_make_point, android_inside_rect_p, android_clear_point)
(android_draw_relief_rect, android_draw_box_rect)
(HIGHLIGHT_COLOR_DARK_BOOST_LIMIT, android_setup_relief_color)
(android_setup_relief_colors, android_draw_glyph_string_box)
(android_draw_glyph_string_bg_rect, android_draw_image_relief)
(android_draw_image_foreground, android_draw_image_foreground_1)
(android_draw_image_glyph_string)
(android_draw_stretch_glyph_string, android_draw_underwave)
(android_draw_glyph_string_foreground)
(android_draw_composite_glyph_string_foreground)
(android_draw_glyphless_glyph_string_foreground)
(android_draw_glyph_string, android_define_frame_cursor)
(android_clear_frame_area, android_clear_under_internal_border)
(android_draw_hollow_cursor, android_draw_bar_cursor)
(android_draw_window_cursor, android_draw_vertical_window_border)
(android_draw_window_divider, android_redisplay_interface)
(frame_set_mouse_pixel_position, get_keysym_name)
(android_create_terminal, android_term_init, syms_of_androidterm)
(mark_androidterm):
* src/androidterm.h (_ANDROID_TERM_H_, struct android_display_info)
(struct android_output, FRAME_ANDROID_OUTPUT, XSCROLL_BAR): New
files.
* src/dired.c (file_attributes): Do not use openat on Android.
* src/dispextern.h (No_Cursor): Define appropriately on Android.
(struct glyph_string, struct face): Make gc field of type struct
android_gc on Android.
* src/dispnew.c (clear_current_matrices, clear_desired_matrices)
(adjust_frame_glyphs_for_window_redisplay, free_glyphs)
(update_frame, scrolling, char_ins_del_cost, update_frame_line)
(init_display_interactive): Disable text terminal support
completely on Android.  Fix non-toolkit menus for non-X systems.
* src/editfns.c (Fuser_full_name): Call android_user_full_name.
* src/emacs.c (android_emacs_init): Make main this on Android.
Prohibit argv sorting from exceeding end of argv.
* src/epaths.in: Add path definitions for Android.

* src/fileio.c (file_access_p): Call android_file_access_p.
(file_name_directory): Avoid using openat on Android.
(Fcopy_file): Adjust to call sys_fstat instead.
(file_directory_p):
(Finsert_file_contents):
(write_region): Likewise.
* src/filelock.c:
* src/fns.c (Flocale_info): Pacify warning on Android.
* src/font.c (font_make_entity_android): New function.
* src/font.h:
* src/frame.c (Fframep):
(Fwindow_system): Handle new window system `android'.  Update doc strings.
(Fmake_terminal_frame): Disable on Android.
(gui_display_get_resource): Disable get_string_resource_hook on Android.
(syms_of_frame): New defsym `android'.

* src/frame.h (GCALIGNED_STRUCT): Add new output data for
Android.
(ENUM_BF): Expand enumerator size.
(FRAME_ANDROID_P, FRAME_WINDOW_P, MOUSE_HL_INFO): Add
definitions for Android.

* src/image.c (GET_PIXEL):
(image_create_bitmap_from_file):
(image_create_x_image_and_pixmap_1):
(image_get_x_image):
(slurp_file):
(lookup_rgb_color):
(image_to_emacs_colors):
(image_from_emacs_colors):
(image_pixmap_draw_cross):
(image_disable_image):
(MaskForeground):
(gif_load): Add stubs for Android.

* src/lisp.h:
* src/lread.c (safe_to_load_version, maybe_swap_for_eln1, openp):
* src/pdumper.c (pdumper_load): Call sys_fstat instead of fstat.
* src/process.c (wait_reading_process_output): Use
android_select instead of pselect.
* src/scroll.c: Disable on Android.
* src/sysdep.c (widen_foreground_group, reset_sys_modes)
(init_signals, emacs_fstatat, sys_fstat): New function.
(emacs_open, emacs_open_noquit, emacs_close): Implement
differently on Android.
(close_output_streams): Disable what is not required on Android.

* src/term.c (OUTPUT1_IF, encode_terminal_code, string_cost)
(string_cost_one_line, per_line_cost, calculate_costs)
(struct fkey_table, tty_append_glyph, produce_glyphs)
(tty_capable_p, Fsuspend_tty, Fresume_tty, device, init_tty)
(maybe_fatal, syms_of_term): Disable text terminal support on
Android.

* src/termhooks.h (enum output_method): Add android output
method.
(GCALIGNED_STRUCT, TERMINAL_FONT_CACHE): Define for Android.

* src/terminal.c (Fterminal_live_p): Implement for Android.

* src/verbose.mk.in (AM_V_GLOBALS): Add JAVAC and DX.
* src/xdisp.c (redisplay_internal): Disable text terminals on Android.
(display_menu_bar):
(display_tty_menu_item):
(draw_row_with_mouse_face):
(expose_frame): Make the non toolkit menu bar work on Android.

* src/xfaces.c (GCGraphicsExposures):
(x_create_gc):
(x_free_gc):
(Fx_load_color_file): Define for Android.

* xcompile/Makefile.in (top_srcdir):
(top_builddir):
* xcompile/README:
* xcompile/langinfo.h (nl_langinfo): New files.

src/sysdep.c

@@ -134,6 +134,10 @@ int _cdecl _spawnlp (int, const char *, const char *, ...);
 # include <sys/socket.h>
 #endif
 
+#ifdef HAVE_ANDROID
+#include "android.h"
+#endif
+
 /* Declare here, including term.h is problematic on some systems.  */
 extern void tputs (const char *, int, int (*)(int));
 
@@ -790,6 +794,7 @@ init_sigio (int fd)
 #endif
 }
 
+#ifndef HAVE_ANDROID
 #ifndef DOS_NT
 #ifdef F_SETOWN
 static void
@@ -801,6 +806,7 @@ reset_sigio (int fd)
 }
 #endif /* F_SETOWN */
 #endif
+#endif
 
 void
 request_sigio (void)
@@ -972,6 +978,8 @@ narrow_foreground_group (int fd)
     tcsetpgrp_without_stopping (fd, getpid ());
 }
 
+#ifndef HAVE_ANDROID
+
 /* Set the tty to our original foreground group.  */
 static void
 widen_foreground_group (int fd)
@@ -979,6 +987,9 @@ widen_foreground_group (int fd)
   if (inherited_pgroup && setpgid (0, inherited_pgroup) == 0)
     tcsetpgrp_without_stopping (fd, inherited_pgroup);
 }
+
+#endif
+
 
 /* Getting and setting emacs_tty structures.  */
 
@@ -1496,6 +1507,8 @@ reset_sys_modes (struct tty_display_info *tty_out)
       fflush (stdout);
       return;
     }
+
+#ifndef HAVE_ANDROID
   if (!tty_out->term_initted)
     return;
 
@@ -1552,6 +1565,7 @@ reset_sys_modes (struct tty_display_info *tty_out)
 #endif
 
   widen_foreground_group (fileno (tty_out->input));
+#endif
 }
 
 #ifdef HAVE_PTYS
@@ -1802,7 +1816,11 @@ handle_arith_signal (int sig)
   xsignal0 (Qarith_error);
 }
 
-#if defined HAVE_STACK_OVERFLOW_HANDLING && !defined WINDOWSNT
+/* This does not work on Android and interferes with the system
+   tombstone generation.  */
+
+#if defined HAVE_STACK_OVERFLOW_HANDLING && !defined WINDOWSNT	\
+  && (!defined HAVE_ANDROID || defined ANDROID_STUBIFY)
 
 /* Alternate stack used by SIGSEGV handler below.  */
 
@@ -1914,12 +1932,16 @@ init_sigsegv (void)
 
 #else /* not HAVE_STACK_OVERFLOW_HANDLING or WINDOWSNT */
 
+#if !defined HAVE_ANDROID || defined ANDROID_STUBIFY
+
 static bool
 init_sigsegv (void)
 {
   return 0;
 }
 
+#endif
+
 #endif /* HAVE_STACK_OVERFLOW_HANDLING && !WINDOWSNT */
 
 static void
@@ -2020,12 +2042,17 @@ init_signals (void)
       sigaction (SIGFPE, &action, 0);
     }
 
+  /* SIGUSR1 and SIGUSR2 are used internally by the android_select
+     function.  */
+#if !defined HAVE_ANDROID
 #ifdef SIGUSR1
   add_user_signal (SIGUSR1, "sigusr1");
 #endif
 #ifdef SIGUSR2
   add_user_signal (SIGUSR2, "sigusr2");
 #endif
+#endif
+
   sigaction (SIGABRT, &thread_fatal_action, 0);
 #ifdef SIGPRE
   sigaction (SIGPRE, &thread_fatal_action, 0);
@@ -2051,8 +2078,10 @@ init_signals (void)
 #ifdef SIGBUS
   sigaction (SIGBUS, &thread_fatal_action, 0);
 #endif
+#if !defined HAVE_ANDROID || defined ANDROID_STUBIFY
   if (!init_sigsegv ())
     sigaction (SIGSEGV, &thread_fatal_action, 0);
+#endif
 #ifdef SIGSYS
   sigaction (SIGSYS, &thread_fatal_action, 0);
 #endif
@@ -2328,11 +2357,20 @@ int
 emacs_fstatat (int dirfd, char const *filename, void *st, int flags)
 {
   int r;
-  while ((r = fstatat (dirfd, filename, st, flags)) != 0 && errno == EINTR)
+#if !(defined HAVE_ANDROID && !defined ANDROID_STUBIFY)
+  while ((r = fstatat (dirfd, filename, st, flags)) != 0
+	 && errno == EINTR)
     maybe_quit ();
+#else
+  while ((r = android_fstatat (dirfd, filename, st, flags)) != 0
+	 && errno == EINTR)
+    maybe_quit ();
+#endif
   return r;
 }
 
+#if !(defined HAVE_ANDROID && !defined ANDROID_STUBIFY)
+
 static int
 sys_openat (int dirfd, char const *file, int oflags, int mode)
 {
@@ -2347,6 +2385,18 @@ sys_openat (int dirfd, char const *file, int oflags, int mode)
 #endif
 }
 
+#endif
+
+int
+sys_fstat (int fd, struct stat *statb)
+{
+#if !(defined HAVE_ANDROID && !defined ANDROID_STUBIFY)
+  return fstat (fd, statb);
+#else
+  return android_fstat (fd, statb);
+#endif
+}
+
 /* Assuming the directory DIRFD, open FILE for Emacs use,
    using open flags OFLAGS and mode MODE.
    Use binary I/O on systems that care about text vs binary I/O.
@@ -2355,6 +2405,8 @@ sys_openat (int dirfd, char const *file, int oflags, int mode)
    Do not fail merely because the open was interrupted by a signal.
    Allow the user to quit.  */
 
+#if !(defined HAVE_ANDROID && !defined ANDROID_STUBIFY)
+
 int
 emacs_openat (int dirfd, char const *file, int oflags, int mode)
 {
@@ -2367,10 +2419,23 @@ emacs_openat (int dirfd, char const *file, int oflags, int mode)
   return fd;
 }
 
+#endif
+
 int
 emacs_open (char const *file, int oflags, int mode)
 {
+#if defined HAVE_ANDROID && !defined ANDROID_STUBIFY
+  int fd;
+#endif
+
+#if !(defined HAVE_ANDROID && !defined ANDROID_STUBIFY)
   return emacs_openat (AT_FDCWD, file, oflags, mode);
+#else
+  while ((fd = android_open (file, oflags, mode)) < 0 && errno == EINTR)
+    maybe_quit ();
+
+  return fd;
+#endif
 }
 
 /* Same as above, but doesn't allow the user to quit.  */
@@ -2382,9 +2447,15 @@ emacs_open_noquit (char const *file, int oflags, int mode)
   if (! (oflags & O_TEXT))
     oflags |= O_BINARY;
   oflags |= O_CLOEXEC;
+#if !(defined HAVE_ANDROID && !defined ANDROID_STUBIFY)
   do
     fd = open (file, oflags, mode);
   while (fd < 0 && errno == EINTR);
+#else
+  do
+    fd = android_open (file, oflags, mode);
+  while (fd < 0 && errno == EINTR);
+#endif
   return fd;
 }
 
@@ -2434,6 +2505,8 @@ emacs_pipe (int fd[2])
    For the background behind this mess, please see Austin Group defect 529
    <https://austingroupbugs.net/view.php?id=529>.  */
 
+#if !(defined HAVE_ANDROID && !defined ANDROID_STUBIFY)
+
 #ifndef POSIX_CLOSE_RESTART
 # define POSIX_CLOSE_RESTART 1
 static int
@@ -2460,6 +2533,8 @@ posix_close (int fd, int flag)
 }
 #endif
 
+#endif
+
 /* Close FD, retrying if interrupted.  If successful, return 0;
    otherwise, return -1 and set errno to a non-EINTR value.  Consider
    an EINPROGRESS error to be successful, as that's merely a signal
@@ -2472,9 +2547,17 @@ posix_close (int fd, int flag)
 int
 emacs_close (int fd)
 {
+  int r;
+
   while (1)
     {
-      int r = posix_close (fd, POSIX_CLOSE_RESTART);
+#if !(defined HAVE_ANDROID && !defined ANDROID_STUBIFY)
+      r = posix_close (fd, POSIX_CLOSE_RESTART);
+#else
+      r = android_close (fd) == 0 || errno == EINTR ? 0 : -1;
+#define POSIX_CLOSE_RESTART 1
+#endif
+
       if (r == 0)
 	return r;
       if (!POSIX_CLOSE_RESTART || errno != EINTR)
@@ -2729,6 +2812,15 @@ errwrite (void const *buf, ptrdiff_t nbuf)
 void
 close_output_streams (void)
 {
+  /* Android comes with some kind of ``file descriptor sanitizer''
+     that aborts when stdout or stderr is closed.  */
+
+#if defined HAVE_ANDROID && !defined ANDROID_STUBIFY
+  fflush (stderr);
+  fflush (stdout);
+  return;
+#endif
+
   if (close_stream (stdout) != 0)
     {
       emacs_perror ("Write error to standard output");