T_EXDATA_REQ(7tpi) T_EXDATA_REQ(7tpi)
NAME
T_EXDATA_REQ - Expedited Data Request
SYNOPSIS
This message consists of one M_PROTO message block followed by
one or more M_DATA message blocks containing at least one byte
of data. The format of the M_PROTO message block is as
follows:
struct T_exdata_req {
long PRIM_type; /* always T_EXDATA_REQ */
long MORE_flag; /* indicates more data in ETSDU */
}
DESCRIPTION
This primitive indicates to the transport provider that this
message contains an expedited transport interface data unit.
One or more expedited transport interface data units form an
expedited transport service data unit.
Note that the maximum size of a expedited
transport service data unit is indicated to the
transport user via the T_INFO_ACK primitive.
This primitive has a mechanism which indicates the beginning
and end of an expedited transport service data unit. However,
not all transport providers support the concept of an
expedited transport service data unit.
Parameters
PRIM_type
identifies the primitive type.
MORE_flag
when greater than zero indicates that the next
T_EXDATA_REQ primitive is also part of this expedited
transport service data unit.
Rules
This primitive does not require any acknowledgments, although
it may generate a fatal error. This is indicated via a
M_ERROR message type which results in the failure of all
operating system service routines on the stream.
Copyright 1994 Novell, Inc. Page 1
T_EXDATA_REQ(7tpi) T_EXDATA_REQ(7tpi)
Errors
The allowable errors are as follows:
EPROTO
This indicates one of the following unrecoverable
protocol conditions:
The transport service interface was found to be in
an incorrect state. If the interface is in the
T_IDLE state when the provider receives the
T_EXDATA_REQ primitive, then the transport
provider should just drop the message without
generating a fatal error.
The amount of transport user data associated with
the primitive defines an expedited transport
service data unit larger than that allowed by the
transport provider.
Modes
Only connection-mode.
Originator
Transport user.
Copyright 1994 Novell, Inc. Page 2