Contrary to the existing documentation here, the value of this
field cannot be the symbols open or closed.  Furthermore, this
field is never set to "stop" for network connections.
* src/process.h (Lisp_Process): Improve/fix documentation of the
'status' field.  (Bug#78784)

Run "TZ=UTC0 admin/update-copyright".

A more general mechanism to pin pointers used for external callbacks is
needed.

* src/process.h (struct Lisp_Process): Add 'gnutls_pproc' pointer to a
pointer to ourselves.
* src/alloc.c (cleanup_vector): Free 'gnutls_pproc'.
* src/gnutls.c (emacs_gnutls_handshake): Allocate 'gnutls_pproc', and
use it.
* src/w32.c (emacs_gnutls_pull):
(emacs_gnutls_push): Use indirection through 'gnutls_pproc'.

This makes it feasible to add GC header members to this struct; keeping
it as a union and merely turning its contents into a struct would have
been misleading and required more difficult changes.

* src/lisp.h (struct vectorlike_header): New type.  Adjust comments.
(union vectorlike_header): Remove.
(PSEUDOVECTORP):
(XSETPVECTYPESIZE):
(struct Lisp_Vector):
(PSEUDOVECTOR_TYPEP):
(struct Lisp_Bool_Vector):
(struct Lisp_Char_Table):
(struct Lisp_Sub_Char_Table):
(struct Lisp_Subr):
(struct Lisp_Obarray):
(struct Lisp_Weak_Hash_Table):
(struct Lisp_Hash_Table):
(struct Lisp_Marker):
(struct Lisp_Overlay)
(struct Lisp_Misc_Ptr):
(struct Lisp_Sqlite):
(struct Lisp_User_Ptr):
(struct Lisp_Finalizer):
(vectorlike_nbytes):
* src/alloc.c (pseudovector_nbytes):
(vectorlike_nbytes):
(vectorlike_marked_p):
(set_vectorlike_marked):
(mark_vectorlike):
* src/androidterm.h (struct scroll_bar):
* src/bignum.h (struct Lisp_Bignum):
* src/buffer.h (struct buffer):
* src/comp.c (helper_PSEUDOVECTOR_TYPEP_XUNTAG):
* src/comp.h (struct Lisp_Native_Comp_Unit):
* src/emacs-module.c (struct Lisp_Module_Function):
* src/emacs-module.h.in (struct module_global_reference):
* src/font.h (struct font_spec, struct font_entity)
(struct font):
* src/frame.h (struct frame):
* src/haikuterm.h (struct scroll_bar): Adjust
* src/pdumper.c (_dump_object_start_pseudovector):
(START_DUMP_PVEC):
(finish_dump_pvec):
(dump_pseudovector_lisp_fields):
(dump_vectorlike_generic):
(fill_pseudovec):
(dump_nilled_pseudovec):
* src/pgtkterm.h (struct scroll_bar):
* src/process.h (struct Lisp_Process):
* src/termhooks.h (struct terminal):
* src/thread.h (struct thread_state):
(struct Lisp_Mutex):
(struct Lisp_CondVar):
* src/treesit.h (struct Lisp_TS_Parser)
(struct Lisp_TS_Node):
(struct Lisp_TS_Query):
* src/w32term.h (struct scroll_bar):
* src/window.c (make_parent_window):
(struct save_window_data):
(struct saved_window):
* src/window.h (struct window):
* src/xterm.h (struct scroll_bar):
* src/xwidget.h (struct xwidget):
(struct xwidget_view): Replace `union vectorlike_header' by `struct
vectorlike_header' throughout.
* doc/lispref/internals.texi: Fix references.

Introduce a async_work_queue that is processed as part of
process_pending_signals.

* src/keyboard.h (struct async_work_item)
(enum async_work_type): New types.
(enqueue_async_work): New function.
* src/keyboard.c (struct async_work_queue): New type.
(async_work_queue): New global variable.
(async_work_queue_len, async_work_queue_pop_front)
(do_async_work, do_async_work_1): New helpers.
(enqueue_async_work): Implementation.
(process_pending_signals): Call do_async_work;
* src/process.h (process_sigchld_async): New function.
* src/process.c (process_sigchld_async): Factored out from
handle_child_signal.
(handle_child_signal): Use enqueue_async_work.

* src/process.h (Lisp_Process): Add field readmax.

* src/process.c (read_process_output): Use it.
(create_process): Save the value of read_process_output_max to
it when the process is created (bug#66020).  Use for pipe size.