T_INFO_ACK(7tpi) T_INFO_ACK(7tpi)
NAME
T_INFO_ACK - Protocol Information Acknowledgment
SYNOPSIS
This message consists of a M_PCPROTO message block formatted
as follows:
struct T_info_ack {
long PRIM_type; /* always T_INFO_ACK */
long TSDU_size; /* max TSDU size */
long ETSDU_size; /* max ETSDU size */
long CDATA_size; /* Connect data size */
long DDATA_size; /* Discon data size */
long ADDR_size; /* TSAP size */
long OPT_size; /* options size */
long TIDU_size; /* TIDU size */
long SERV_type; /* service type */
long CURRENT_state; /* current state */
long PROVIDER_flag; /* provider flags */
}
DESCRIPTION
This primitive indicates to the transport user any relevant
protocol-dependent parameters. It should be initiated in
response to the T_INFO_REQ primitive described above. The
format of this message is one M_PCPROTO message block.
Parameters
The fields of this message have the following meanings:
PRIM_type
This indicates the primitive type.
TSDU_size
A value greater than zero specifies the maximum size of
a transport service data unit (TSDU); a value of zero
specifies that the transport provider does not support
the concept of TSDU, although it does support the
sending of a data stream with no logical boundaries
preserved across a connection; a value of -1 specifies
that there is no limit on the size of a TSDU; and a
value of -2 specifies that the transfer of normal data
is not supported by the transport provider.
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T_INFO_ACK(7tpi) T_INFO_ACK(7tpi)
ETSDU_size
A value greater than zero specifies the maximum size of
an expedited transport service data unit (ETSDU); a
value of zero specifies that the transport provider does
not support the concept of ETSDU, although it does
support the sending of an expedited data stream with no
logical boundaries preserved across a connection; a
value of -1 specifies that there is no limit on the size
of an ETSDU; and a value of -2 specifies that the
transfer of expedited data is not supported by the
transport provider.
CDATA_size
A value greater than or equal to zero specifies the
maximum amount of data that may be associated with
connection establishment primitives; and a value of -2
specifies that the transport provider does not allow
data to be sent with connection establishment
primitives.
DDATA_size
A value greater than or equal to zero specifies the
maximum amount of data that may be associated with the
disconnect primitives; and a value of -2 specifies that
the transport provider does not allow data to be sent
with the disconnect primitives.
ADDR_size
A value greater than or equal to zero indicates the
maximum size of a transport protocol address; and a
value of -2 specifies that the transport provider does
not provide user access to transport protocol addresses.
OPT_size
A value greater than or equal to zero indicates the
maximum number of bytes of protocol-specific options
supported by the provider; and a value of -2 specifies
that the transport provider does not support user-
settable options.
TIDU_size
This is the amount of user data that may be present in a
single T_DATA_REQ or T_EXDATA_REQ primitive. This is
the size of the transport protocol interface data unit,
and should not exceed the tunable system limit, if non-
zero, for the size of a STREAMS message.
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T_INFO_ACK(7tpi) T_INFO_ACK(7tpi)
SERV_type
This field specifies the service type supported by the
transport provider, and is one of the following:
T_COTS
The provider service is connection oriented with
no orderly release support.
T_COTS_ORD
The provider service is connection oriented with
orderly release support.
T_CLTS
The provider service is a connectionless transport
service.
CURRENT_state
This is the current state of the transport provider.
PROVIDER_flag
This field specifies additional properties specific to
the transport provider and may alter the way the
transport user communicates. The following flags may be
set by the provider:
SENDZERO
This flag indicates that the transport provider
supports the sending of zero-length TSDUs.
XPG4_1
This flag indicates that the transport provider
supports XPG4 semantics.
Rules
The following rules apply when the type of service is T_CLTS:
The ETSDU_size, CDATA_size and DDATA_size fields should
be -2.
The TSDU_size should equal the TIDU_size.
Modes
Both connection-mode and connectionless-mode.
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T_INFO_ACK(7tpi) T_INFO_ACK(7tpi)
Originator
Transport provider.
Copyright 1994 Novell, Inc. Page 4