GitLab

	Added VMS changes from Roland Roberts.

	* process.c (read_process_output): Save, widen, insert the process
	output, and then restore the restriction if inserting text outside
	the visible region.

	* process.c (Fstart_process): Establish an unwind-protect to
	remove PROC from the process list if an error occurs while
	starting it.
	(start_process_unwind): New function to help with that.
	(create_process): There's no need to explicitly call
	remove_process if the fork fails; the record_unwind_protect in
	Fstart_process will take care of it.

	* process.c (wait_reading_process_input): Test the C preprocessor
	symbol "ultrix", not "__ultrix__" to see if we should ignore
	ENOMEM errors from select.

	* process.c (process_send_signal): On systems which have both
	the TIOCGETC and TCGETA ioctls, just use the former.

	* s/bsd4-2.h, s/bsd4-3.h: #define SIGNALS_VIA_CHARACTERS.
	* process.c (process_send_signal): Put all the code for sending
	signals via characters in a #ifdef SIGNALS_VIA_CHARACTERS.  Decide
	whether to use the Berkeley-style or SYSV-style ioctls by seeing
	which ioctl commands are #defined.

	* process.c (process_send_signal): Doc fix.