Technical Reference: Communications, Volume 1

Network Data Received Routine for DLC

Purpose

Receives network-specific data each time it is coded by the kernel user and called by generic data link control (GDLC).

Syntax

#include <sys/gdlextcb.h>

int (*dlc_open_ext.rcvn_fa)( m, ext) struct mbuf *m; struct dlc_io_ext *ext;

Description

The DLC Network Data Received routine receives network-specific data each time the routine is coded by the kernel user and called by GDLC.

Each GDLC supports a subset of the data-received routines. It is critical to performance that the Network Data Received routine be coded to minimize the amount of time spent prior to returning to the GDLC that called it.

Parameters

m	Points to a communications memory buffer (mbuf).
ext	Specifies the receive extension parameter. This is a pointer to the dlc_io_ext extended I/O structure for read operations.

Return Values

DLC_FUNC_OK	Indicates that the received network mbuf data has been accepted.
DLC_FUNC_RETRY	Indicates that the received network mbuf data cannot be accepted at this time. GDLC should retry this function call later. The actual retry wait period depends on the DLC in use. Excessive retries can cause a disabling of the service access point.

Related Information

read Subroutine Extended Parameters for DLC .

Generic Data Link Control (GDLC) Environment Overview in AIX 5L Version 5.2 Communications Programming Concepts.