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ZCOM C I/F Library Routines

ZSEND (3X)

Chapter 4 311

If Bit ZCOM_ZSEND_NOMX (0x4000) of mode is set and the request is

to a outbound-multiplexed terminal ZLU, the outbound multiplexing is

over-ridden. This results in the data being sent directly to the terminal

(instead of the multiplexing program).

The ZCOM_ZSEND_MHD and ZCOM_ZSEND_NOMX bits are intended

for use by multiplexing programs to intercept terminal messages and

build specific messages or responses as required.

They can cause strange ZCOM subsystem behavior if used improperly;

hence, they must be used with caution.

If bit ZCOM_ZSEND_LPR (0x0080) or ZCOM_ZSEND_XPS (0x0040) is

set and the request is to a terminal, then the message will be queued on

the low priority or express transmit queue, respectively. Otherwise, it

defaults to the high priority queue.

The different transmit queues allow the caller to have some control over

the order of messages being sent. The express queue is always processed

first and is not bounded by queue limit. It is intended for sending critical

control data and should never be used for normal data. The high priority

queue is subject to queue limit checks and is intended for sending normal

data. The low priority queue is processed only after all express and high

priority messages are sent and is also bounded by queue limit checks. It

is intended for sending data in a background mode. For a busy terminal,

low priority messages will not be sent until all its higher priority

activities are completed.

mhp->mrq.mrqstat - returned status (for response messages)

mhp->mrq.mrqtag - protocol tag value (for terminal ZLU only)

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HP Advanced Communications Controllers (ACC) Guide de l'utilisateur Page 311