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* xterm.c (x_connection_closed): Likewise.

* sysdep.c (croak): Likewise.

* sound.c (sound_perror, alsa_sound_perror): Likewise.

* lisp.h (die, nsberror): Likewise.

non-interactive mode.

BROKEN_GET_CURRENT_DIR_NAME.

* sysdep.c (get_current_dir_name): Also define if
BROKEN_GET_CURRENT_DIR_NAME.

* m/ibmrs6000.h: Test for USG5, not USG5_4.

(SIGNAL_THREAD_CHECK): New macro.

* keyboard.c (input_available_signal): Move thread checking code
to macro SIGNAL_THREAD_CHECK and call that macro.
(interrupt_signal): Call SIGNAL_THREAD_CHECK.

* alloc.c (uninterrupt_malloc): Move main_thread to emacs.c.

* emacs.c: Define main_thread.
(main): Initialize main_thread.
(handle_USR1_signal, handle_USR2_signal, fatal_error_signal)
(memory_warning_signal): Call SIGNAL_THREAD_CHECK.

* floatfns.c (float_error): Call SIGNAL_THREAD_CHECK.

* dispnew.c (window_change_signal): Call SIGNAL_THREAD_CHECK.

* sysdep.c (select_alarm): Call SIGNAL_THREAD_CHECK.

* process.c (send_process_trap, sigchld_handler): Call
SIGNAL_THREAD_CHECK.

* data.c (arith_error): Call SIGNAL_THREAD_CHECK.

* atimer.c (alarm_signal_handler): Call SIGNAL_THREAD_CHECK.

(emacs_open, emacs_read, emacs_write): Check QUIT when interrupted.

Set VQUIT and VINTR chars to the standard ones if they are unset.
[AIX]: Don't do that here.  And don't force VINTR to standard
when SIGNALS_VIA_CHARACTERS.

ReceiveNextEvent to prevent breakage.  Correctly handle
blocking on event queue only by calling ReceiveNextEvent
instead of select (since GUI events aren't on an fd).
(sys_read): Remove function
sysdep.c: Remove redefine of read to sys_read if HAVE_CARBON

(read_input_waiting): Adapt to new read_socket_hook interface.
Remove allocation and initialization of local input_event buffer,
as read_socket_hook stores events directly in fifo.  Allocate and
initialize local hold_quit event to handle postponed quit event
(and store it if set by kbd_buffer_store_event_hold).

data to kbd_buffer_store_event.

HAVE_DECL_SYS_SIGLIST, not SYS_SIGLIST_DECLARED.

new macros in dispextern.h, frame.h and window.h.

unrequest_sigio, they are defined on msdos.c.

form has been defined.