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ZCOM C I/F Library Routines

LTFIND (3X)

Chapter 4 147

LTFIND (3X)

NAME ltfind – Find specific logical terminal in a group

SYNOPSIS

#include <zcom/zcomsys.h>

#include <zcom/zcomcall.h> /* if compiled with ANSI C

(recommended) */

int32 ltfind (zap, laddr, llen, ibuf, len)

zaddr_type *zap;

char *laddr;

int32 llen;

char *ibuf;

int32 len;

DESCRIPTION Routine ltfind searches through the group linkage in the logical terminal

table, for the logical terminal with the specified logical address.

Group linkages are set up by TTGEN to form a circular list of logical

terminals that are associated with the same physical terminal table. The

linkages and logical addresses are defined using the PTERM and

LTERM statements in the TTGEN configuration file.

Typically, these linkages are used in a multiplexing environment: a lower

level protocol receives multiplexed messages, which contain ID codes for

a higher level protocol to further differentiate the data messages. In such

cases, the logical terminals may have unique ID codes as their logical

addresses, and ltfind is used to locate a logical terminal ZLU with a

specified ID code.

Normally, the logical addresses (maximum of 10-bytes) of a group of

logical terminals should be unique within that group.

The libraries libzcom_c.a and libpthread.a must be linked into the calling

program by giving the options “-lzcom_c -lpthread” options to cc(1) or

ld(1).

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HP Advanced Communications Controllers (ACC) Guide de l'utilisateur Page 147