T_BIND_ACK(D7tpi)

Synopsis

   struct T_bind_ack {
   	long PRIM_type;              /* always T_BIND_ACK */
   	long ADDR_length;            /* length of address - */
   	long ADDR_offset;            /* offset of address */
   	unsigned long CONIND_number; /* connect indications
                                           to be queued */
   }

Description

Parameters

PRIM_type

indicates the primitive type.

ADDR_length

is the length of the protocol address that was bound to the stream and ADDR_offset is the offset from the beginning of the M_PCPROTO block where the protocol address begins.

CONIND_number

is the accepted number of connect indications allowed to be outstanding by the transport provider for the specified protocol address.

The proper alignment of the address in the M_PCPROTO message block is not guaranteed.

• Note that this field doesn't apply to connectionless transport providers.

Rules

• If the ADDR_length field in the T_BIND_REQ/O_T_BIND_REQ primitive is 0, then the transport provider is to assign a transport protocol address to the user.

• The transport provider is to bind the transport protocol address as specified in the T_BIND_REQ/O_T_BIND_REQ primitive.

• If the transport provider cannot bind the specified address, it may assign another address to the user if the primitive O_T_BIND_REQ was used. In this case, it is the transport user's responsibility to check the protocol address returned in the T_BIND_ACK primitive to see if it is the same as the one requested, and take appropriate action. If T_BIND_REQ was used, the provider should return an error.

The following rules apply to negotiating the CONIND_number argument:

• The returned value must be less than or equal to the corresponding requested number as indicated in the T_BIND_REQ/O_T_BIND_REQ primitive.

• If the requested value is greater than zero, the returned value must also be greater than zero.

• Only one stream that is bound to the indicated protocol address may have a negotiated accepted number of maximum connect requests greater than zero. If a O_T_BIND_REQ primitive specifies a value greater than zero, but another stream has already bound itself to the given protocol address with a value greater than zero, the transport provider should assign another protocol address to the user.

• If a stream with CONIND_number greater than zero is used to accept a connection, the stream will be found busy during the duration of that connection and no other stream may be bound to that protocol address with a CONIND_number greater than zero. This will prevent more than one stream bound to the identical protocol address from accepting connect indications.

• A stream requesting a CONIND_number of zero should always be valid. This indicates to the transport provider that the stream is to be used to request connections only.

• A stream with a negotiated CONIND_number greater than zero may generate connect requests or accept connect indications.

Errors

Modes

Originator

Notices

Hardware constraints

Applicability

Backward compatibility

Forward compatibility