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ZCOM C I/F Library Routines

ZLUOPEN (3X)

Chapter 4260

ZLUOPEN (3X)

NAME zluopen – Open a ZLU file

SYNOPSIS

#include <zcom/zcomsys.h>

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

int zluopen (zap, mode, fd)

zaddr_type *zap;

int mode;

int *fd;

DESCRIPTION Routine zluopen opens the device file associated with a program ZLU for

use with the standard HP-UX file access routines. The zap parameter

points to the program ZLU to be accessed. If successful, a file descriptor

for the opened program ZLU device file is returned through the fd

pointer. The mode parameter is intended for a future enhancement and

is not used at this time. For future compatibility, mode should be set to

zero.

The zluopen routine only allows opening the device files for the range of

program ZLUs in the local system. If zap specifies a terminal ZLU, or a

ZLU on remote node, the request will also be rejected with an error.

In the current implementation of ZCOM, only the select and close

functions are allowed on the returned file descriptor. Other operations

(such as read and write) will result in error ENOSYS (Function is not

available). A select for read on the returned file descriptor is to check

whether input data is available on a program ZLU. A select on write on

the returned file descriptor will always return TRUE, while a select on

exception always returns FALSE.

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) Guia do Utilizador Página 260