(exec_sentinel_error_handler): New function.
(exec_sentinel): Catch all errors in the sentinel. (read_process_output_error_handler): New function. (read_process_output_call): New function. (read_process_output): Catch and report errors in filters. (pty_name): Move it up; make it static. (create_process): Set the tty_name field. (Fprocess_tty_name): New function. (syms_of_process): defsubr it.
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