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ZCOM C I/F Library Routines

ZCNTL (3X)

Chapter 4170

ZCNTL (3X)

NAME zcntl – Send control message to terminal ZLU

SYNOPSIS

#include <zcom/zcomsys.h>

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

int32 zcntl (zap, mode, rcode, mhp, ibuf, len, rstat)

zaddr_type *zap;

uint32 mode;

uint32 rcode;

zmhd_type *mhp;

char *ibuf;

int32 len

int32 *rstat;

DESCRIPTION Routine zcntl is used to change the state of a terminal or to send a

protocol dependent control message to a terminal ZLU. The routine

zsend(3X) should be used for sending normal data messages to a

terminal.

The terminal must be disabled first if configuration parameters are to be

changed (e.g. rcode=6). As in zsend(3X), the mode parameter is used to

specify how the call should be completed and for selecting the priority of

the request. See under zsend(3X) for more information on its usage.

The response returned from zcntl is through the primary ZLU unless a

different source ZLU is specified in the header (mhp->mid.mzsrce).

Note that a program must call zopen() to allocate a primary or auxiliary

input ZLU before calling the zsend() routine. This must be done even if

the program does not need an input ZLU, for example, if it is not doing

any zread() calls and is only doing zsend() calls with mode =

ZcMODE_NO_WAIT (0) (send no-wait) where it does not care about the

return status.

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

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

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HP Advanced Communications Controllers (ACC) Guide de l'utilisateur Page 170