id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
87	MCS accept_input does not work.	charles.unix.pro@…	Eric Swenson	"MCS accept_input sets incorrect buffer addresses in the rtx/input_accepted message, causing the FNP to copy the input data to the wrong memory location.

The problem arises in bound_355_wired::dn355$process_accept_input:

                    input_sub_mbx.dcw (k).abs_addr =
                         bit (bin (tty_buf.absorig + bin (rel (addr (buffer.chars))), 24), 24);
                                                            /* point DCW at data portion of buffer */

wherein tty_buf.absorig putatively contains the absolute address of of tty_buf.

tty_buf.absorig is set in bound_temp_2::fnp_init:

           tty_buf.absorig = sys_info$page_size * FIRST_TTY_BUF_PAGEX;

with:

dn355_data.incl.pl1:declare  FIRST_TTY_BUF_PAGEX fixed bin init (64) int static options (constant);

However, in tty_buf.cds we see that in Jan. 81, tty_buf became a dynamically allocated segment, invalidating the value calculated in fnp_init.

The line calculating absorig in fnp_init need to be fixed to look or calculate the correct address, and/or all references to absorig and FIRST_TTY_BUF_PAGEX need to be tracked down and replaced with correct code.

"	defect	closed	major		Hardcore		worksforme	tty_buf, absorig, FIRST_TTY_BUF_PAGEX, accept_input, input_accepted