Sequence Packet Exchange (SPX)

SPX is a connection-based, reliable, sequenced transport protocol which provides:

guaranteed packet delivery

ensuring that packets are received in order by the destination endpoint

flow control

regulating the speed at which packets are sent and received by both the sending and receiving processes

The TLI (Transport Layer Interface) library provides routines with which to access SPX. SPX supports the following calls from the TLI library:

t_accept

accept a connect request

t_alloc

allocate a library structure

t_bind

bind an address to a transport endpoint

t_close

close a transport endpoint

t_connect

establish a connection with another transport user

t_error

produce an error message

t_free

free a library structure

t_getinfo

get protocol-specific service information

t_getstate

get the current state

t_listen

listen for a connect request

t_look

look at the current event on a transport endpoint

t_open

establish a transport endpoint

t_optmgmt

manage options for a transport endpoint

t_rcv

receive data or expedited data sent over a connection

t_rcvdis

retrieve information from disconnect

t_snd

send data or expedited data over a connection

t_snddis

send user-initiated disconnect request

t_sync

synchronize transport library

t_unbind

disable a transport endpoint

The structures used by the TLI interface to SPX are:

• t_bind

• t_call

• t_discon

• t_info

• t_optmgmt