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Fprocess_exit_status, Fprocess_id, Fprocess_name, Fprocess_command,
Fprocess_tty_name, Fset_process_buffer, Fprocess_buffer, Fprocess_mark,
Fset_process_filter, Fprocess_filter, Fset_process_sentinel,
Fprocess_sentinel, Fset_process_window_size, Fprocess_kill_without_query,
Faccept_process_output): Harmonize arguments with documentation.

block signals, if available.  If HAVE_VFORK, save and restore
signal handlers that the child might change, since in many
systems (e.g. Solaris 2.4) if the child changes the signal
handlers this munges the parent's handler.

Use HAVE_WINDOW_SYSTEM instead of testing for specific window systems.

Call record_asynch_buffer_change only if caller is reading kbd input.

record_asynch_buffer_change after any eval.  Don't call
prepare_menu_bars.
(wait_reading_process_input): Don't call prepare_menu_bars.

Error if it is a directory.

Set update_tick at the beginning not at end.

(wait_reading_process_input) [both versions]: Cast args of select.

the loop, do the whole loop again.

Clear waiting_for_input around calling redisplay_preserve_echo_area.

pty_name in the child.  Exit the child instead.

so Fprocess_tty_name returns nil for pipes as its docstring says.

(exec_sentinel_error_handler): Fsleep_for wants two args.

or sentinel changes the local map, call record_asynch_buffer_change.

when a filter or sentinel tries to modify it.

IS_DEVICE_SEP, DIRECTORY_SEP, and DEVICE_SEP.
[WINDOWSNT]: Add includes.  Don't define sys_siglist.

(sigchld_handler): Work around bug in MS C compiler.
(sigchld_handler) [WINDOWSNT]: Do not call signal.
(signal_process) [WINDOWSNT]: Use win32_kill_process instead of kill.
(read_process_output) [WINDOWSNT]: Use read_child_output instead of
read.

(create_process) [WINDOWSNT]: Use
pipe_with_inherited_out  and pipe_with_inherited_in.
Use the pid returned by child_setup.  Deal with not having vfork,
Call register_child.
(close_process_descs): Do nothing if WINDOWSNT.

(proc_buffer_char): No longer static.

(sigchld_handler): Add a cast.

(non_keyboard_wait_mask): New variable.
(Fset_process_filter): Update non_keyboard_wait_mask
(create_process, Fopen_network_stream, deactivate_process):
(init_process, sigchld_handler): Likewise.
(wait_reading_process_input): Maybe use non_keyboard_wait_mask.
(add_keyboard_wait_descriptor):
Renamed from change_keyboard_wait_descriptor.
Clear the old descriptor's bit only the first call.
(delete_keyboard_wait_descriptor): New function.
(keyboard_bit_set): New function.
(wait_reading_process_input): Use keyboard_bit_set.
Start the loop over process descs from 0, and explicitly
ignore non-process input descs.
(init_process): Don't init keyboard_descriptor.
(keyboard_descriptor): Variable deleted.
(add_keyboard_wait_descriptor): Don't set keyboard_descriptor.
(delete_keyboard_wait_descriptor): New function.