* src/process.c: Export default filters and sentinels to Elisp.
(Qinternal_default_process_sentinel, Qinternal_default_process_filter): New constants. (pset_filter, pset_sentinel, make_process, Fset_process_filter) (Fset_process_sentinel, Fformat_network_address): Default to them instead of nil. (server_accept_connection): Sentinels can't be nil any more. (read_and_dispose_of_process_output): New function, extracted from read_process_output. (read_process_output): Use it; filters can't be nil. (Finternal_default_process_filter): New function, extracted from read_process_output. (exec_sentinel_unwind): Remove function. (exec_sentinel): Don't zilch sentinel while running. (status_notify): Sentinels can't be nil. (Finternal_default_process_sentinel): New function extracted from status_notify. (setup_process_coding_systems): Default filter is not nil any more. (syms_of_process): Export new Elisp functions and initialize new constants. * src/lisp.h (make_lisp_proc): New function.
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