Asynchronous Serial Communications Programmer's Reference Manual (32022-90052)

Chapter 8 189

Intrinsics Reference

FCONTROL(34, 35)

Parameters

controlcode 34 — Allows printing of !!! when line deletion

character is entered.

35 — Prevents printing of !!! when line deletion

character is entered

param 16-bit unsigned integer by reference

(required)

This parameter has no meaning for these controlcode

values. Enter a dummy value of 0 to satisfy the internal

requirements of the intrinsic.

Notes An FCONTROL call with a controlcode value of 35

suppresses output of the line deletion response (!!!,

carriage return and linefeed) at the terminal when the

line deletion character (normally

[CTRL]X) is entered. A

call using controlcode 34 turns this output back on.

In character mode, with standard editing in operation,

the computer outputs !!! CR/LF whenever the line

deletion (cancel) character is entered. This is referred

to as

[CTRL]X echo, since [CTRL]X is the default line

deletion character.

You can cause [CTRL]X echo to be suppressed by calling

FCONTROL(35). MPE/iX will still delete the data in

the input buffer, but no !!! CR/LF will be issued.

[CTRL]X Echo is initially enabled by default and is reset

to the enabled state at FCLOSE.

For devices connected via PAD, the line deletion

response is never printed in response to the line

deletion character. If issued to such a device, these calls

will return a CCE condition code, but no device control

action will occur.

For devices connected via VT from an HP-UX local

client, these controlcode values are not supported.