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 nt/inc/unistd.h (tcgetpgrp, setsid): Provide prototypes.

(DISPNEW_NEEDS_STDIO_EXT, GETPGRP_VOID, HAVE_SETPGID, HAVE_SETSID)
(PENDING_OUTPUT_COUNT, SETPGRP_RELEASES_CTTY): Remove.

This removes code that has been obsolete since around 1990.
* admin/CPP-DEFINES (HAVE_SETPGID, HAVE_SETSID, SETPGRP_RELEASES_CTTY):
Remove; obsolete.
* configure.ac (setpgid, setsid): Assume their existence.
(AC_FUNC_GETPGRP, SETPGRP_RELEASES_CTTY): Remove; obsolete.
* src/callproc.c (Fcall_process):
* src/emacs.c (main):
* src/process.c (create_process):
* src/term.c (dissociate_if_controlling_tty):
Assume setsid exists.
* src/callproc.c (child_setup): Assume setpgid exists and behaves as
per POSIX.1-1988 or later.
* src/conf_post.h (setpgid) [!HAVE_SETPGID]: Remove.
* src/emacs.c (shut_down_emacs):
* src/sysdep.c (sys_suspend, init_foreground_group):
Assume getpgrp behaves as per POSIX.1-1998 or later.
* src/msdos.c (setpgrp): Remove.
(tcgetpgrp, setpgid, setsid): New functions.
* src/systty.h (EMACS_GETPGRP): Remove.  All callers now use getpgrp.
* src/term.c (no_controlling_tty): Remove; unused.
* src/w32proc.c (setpgrp): Remove.
(setsid, tcgetpgrp): New functions.

Fixes: debbugs:12800

Now that Emacs is using the gnulib fpending module,
there's no need for Emacs to have a separate implementation.
* configure.ac (stdio_ext.h, __fpending): Remove now-duplicate checks.
(PENDING_OUTPUT_COUNT, DISPNEW_NEEDS_STDIO_EXT): Remove.
* admin/CPP-DEFINES (PENDING_OUTPUT_COUNT): Remove.
* src/dispnew.c: Include <fpending.h>, not <stdio_ext.h>.
(update_frame_1): Use __fpending, not PENDING_OUTPUT_COUNT.
Do not assume that __fpending's result fits in int.

* dispnew.c (update_frame_1): Remove hack for terminals slower
than 2400 bps, which throttled Emacs by having it sleep.  This
code hasn't worked since at least 2007, when the multi-tty stuff
was added, and anyway those old terminals are long dead.
* systty.h (EMACS_OUTQSIZE): Remove; unused.  The macro isn't used even
without the dispnew.c change, as dispnew.c doesn't include systty.h.

* emacs.c (close_output_streams): Use strerror, not emacs_strerror,
as we can't assume that emacs_strerror is initialized, and strerror
is good enough here.
(main): Invoke atexit earlier, to catch earlier instances of
sending data to stdout and exiting, e.g., "emacs --version >/dev/full".

Fixes: debbugs:9574

(GNULIB_CLOSE_STREAM, HAVE_DECL___FPENDING): New macros.

Fixes: debbugs:7850

(keyDown): Remap keypad keys to X11 virtual key codes.

Fixes: debbugs:8680

* isearch.el (isearch-help-for-help, isearch-describe-bindings)
(isearch-describe-key, isearch-describe-mode): Use a display
action instead of binding same-window-* variables.

Fixes: debbugs:10040

 nt/config.nt (PENDING_OUTPUT_N_BYTES): Define.

 lib/makefile.w32-in (GNULIBOBJS): Add $(BLD)/fpending.$(O) and
 $(BLD)/close-stream.$(O).
 ($(BLD)/close-stream.$(O)):
 ($(BLD)/fpending.$(O)): New dependencies.

Fixes: debbugs:9574

* doc/misc/cl.texi (Creating Symbols, Random Numbers):
De-emphasize internal variables cl--gensym-counter and cl--random-state. 

* etc/NEWS: Related edits.

Fixes: debbugs:12788

* admin/merge-gnulib (GNULIB_MODULES): Add close-stream.
* lib/close-stream.c, lib/close-stream.h, lib/fpending.c
* lib/fpending.h, m4/close-stream.m4, m4/fpending.m4:
New files, from gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/emacs.c: Include <close-stream.h>.
(close_output_streams): New function.
(main): Pass it to atexit, so that Emacs closes stdout and stderr
and handles errors appropriately.
(Fkill_emacs): Don't worry about flushing, as close_output_stream
does that now.

Fixes: debbugs:9574

* emacs-lisp/cl-lib.el (cl--random-time): Rename from cl-random-time. 
(cl--gensym-counter, cl--random-state): Update callers.
* emacs-lisp/cl-extra.el (cl-make-random-state): Update callers.

Fixes: debbugs:12773

The symptom is a diagnostic "GLib-WARNING **: In call to
g_spawn_sync(), exit status of a child process was requested but
SIGCHLD action was set to SIG_IGN and ECHILD was received by
waitpid(), so exit status can't be returned."  The diagnostic
is partly wrong, as the SIGCHLD action is not set to SIG_IGN.
The real bug is a race condition between Emacs and glib: Emacs
does a waitpid (-1, ...) and reaps glib's subprocess by mistake,
so that glib can't find it.  Work around the bug by invoking
waitpid only on subprocesses that Emacs itself creates.
* process.c (create_process, record_child_status_change):
Don't use special value -1 in pid field, as the caller now must
know the pid rather than having the callee infer it.  The
inference was sometimes incorrect anyway, due to another race.
(create_process): Set new 'alive' member if child is created.
(process_status_retrieved): New function.
(record_child_status_change): Use it.
Accept negative 1st argument, which means to wait for the
processes that Emacs already knows about.  Move special-case code
for DOS_NT (which lacks WNOHANG) here, from caller.  Keep track of
processes that have already been waited for, by testing and
clearing new 'alive' member.
(CAN_HANDLE_MULTIPLE_CHILDREN): Remove, as record_child_status_change
now does this internally.
(handle_child_signal): Let record_child_status_change do all
the work, since we do not want to reap all exited child processes,
only the child processes that Emacs itself created.
* process.h (Lisp_Process): New boolean member 'alive'.

Fixes: debbugs:8855

* lisp/emacs-lisp/cl-macs.el (cl-parse-loop-clause):
Rename handler properties back from cl-- to cl-.

Fixes: debbugs:12788

* lisp.h (GCTYPEBITS, GCALIGNMENT, ARRAY_MARK_FLAG, PSEUDOVECTOR_FLAG)
(VALMASK, MOST_POSITIVE_FIXNUM, MOST_NEGATIVE_FIXNUM):
Define only as macros.  There's no longer any need to also define
these symbols as enums or as constants, since we now assume
gcc -g3 when debugging.

* cl.texi: Further general copyedits.
(List Functions): Remove copy-tree, standard elisp for some time.
(Efficiency Concerns): Comment out examples that no longer apply.
(Compiler Optimizations): Rename from "Optimizing Compiler"; reword.

* src/process.c (wait_reading_process_output): Avoid a race condition
with SIGIO delivery.

Fixes: debbugs:11536

* src/buffer.c (cursor_type): Untabify docstring.

Fixes: debbugs:11633

 config.bat: Copy lib/execinfo.in.h to lib/execinfo.in-h if needed.

 msdos/sedlibmk.inp: Sync with changes in lib/Makefile.in.
 (HAVE_DECL_ENVIRON, GNULIB_ENVIRON): Edit to require declaration
 through lib/unistd.h.
 msdos/sed1v2.inp: Sync with changes in src/Makefile.in.
 msdos/sed2v2.inp: Sync with changes in src/config.in.

 src/lisp.mk: Adjust comments to the fact that term/internal is now
 loaded from loadup.el.
 src/msdos.c (msdos_abort): Rename from emacs_abort, and make static.
 (msdos_fatal_signal): New function.
 (XMenuActivate): Adjust the call to kbd_buffer_events_waiting to
 its argument list.
 src/conf_post.h (_GL_EXECINFO_INLINE) [MSDOS]: Define to "inline"
 for GCC versions before 4.
 (emacs_raise): Define to call msdos_fatal_signal.

 lisp/term/pc-win.el: Don't load term/internal from here.
 lisp/loadup.el: Load term/internal from here.

jit-lock.

Fixes: debbugs:12645

* widget.c (resize_cb): New function.
(EmacsFrameRealize): Add resize_cb as event handler.
(EmacsFrameResize): Check if all is up to date before changing frame
size.

Fixes: debbugs:12733

* objects.texi (General Escape Syntax): Clarify the explanation of
escape sequences.
(Non-ASCII in Strings): Clarify when a string is unibyte vs
multibyte.  Hex escapes do not automatically make a string multibyte.

* window.el (switch-to-visible-buffer)
(switch-to-buffer-preserve-window-point): Fix doc-strings.

* windows.texi (Switching Buffers): Document option
switch-to-buffer-preserve-window-point.
(Display Action Functions): Document window-height and
window-width alist entries.
(Display Action Functions): Document
display-buffer-below-selected and
display-buffer-in-previous-window.
(Quitting Windows): Document quit-restore-window.  Rewrite
section.
(Window Configurations): In window-state-get mention that
argument window must be valid.
(Window Parameters): Document quit-restore window parameter
(Bug#12158).

 src/xdisp.c (init_from_display_pos): Fix initialization of the bidi
 iterator when starting in the middle of a display or overlay
 string.

Fixes: debbugs:12745