State Tables

The tables describe the XTI/TLI state transitions. Each box contains the next state, given the current state (column) and the current event (row). An empty box is an invalid state/event combination. Each box can also have an action list. Actions must be done in the order specified in the box.

The following should be understood when studying the state tables:

• t_close(3NSL) causes an established connection to be terminated for a connection-oriented transport provider. The connection termination will be orderly or abortive, depending on the service type supported by the transport provider. See t_getinfo(3NSL).

• If a transport user issues a function out of sequence, the function fails and t_errno is set to TOUTSTATE. The state does not change.

• The error codes TLOOK or TNODATA after t_connect(3NSL) can result in state changes described in "Event Handling". The state tables assume correct use of XTI/TLI.

• Any other transport error does not change the state, unless the manual page for the function says otherwise.

• The support functions t_getinfo(3NSL), t_getstate(3NSL), t_alloc(3NSL), t_free(3NSL), t_sync(3NSL), t_look(3NSL), and t_error(3NSL) are excluded from the state tables because they do not affect the state.

Table 3-11, Table 3-12, Table 3-13, and Table 3-14 show endpoint establishment, data transfer in connectionless mode, and connection establishment/connection release/data transfer in connection mode.

Table 3-11 Connection Establishment State

Event/State	T_UNINIT	T_UNBND	T_IDLE
opened	T_UNBND
bind		T_IDLE[1]
optmgmt (TLI only)			T_IDLE
unbind			T_UNBND
closed		T_UNINIT

Table 3-12 Connection Mode State--Part 1

Event/State	T_IDLE	T_OUTCON	T_INCON	T_DATAXFER
connect1	T_DATAXFER
connect2	T_OUTCON
rcvconnect		T_DATAXFER
listen	T_INCON [2]		T_INCON [2]
accept1			T_DATAXFER [3]
accept2			T_IDLE [3] [4]
accept3			T_INCON [3] [4]
snd				T_DATAXFER
rcv				T_DATAXFER
snddis1		T_IDLE	T_IDLE [3]	T_IDLE
snddis2			T_INCON [3]
rcvdis1		T_IDLE		T_IDLE
rcvdis2			T_IDLE [3]
rcvdis3			T_INCON [3]
sndrel				T_OUTREL
rcvrel				T_INREL
pass_conn	T_DATAXFER
optmgmt	T_IDLE	T_OUTCON	T_INCON	T_DATAXFER
closed	T_UNINIT	T_UNINIT	T_UNINIT	T_UNINIT

Table 3-13 Connection Mode State--Part 2

Event/State	T_OUTREL	T_INREL	T_UNBND
connect1
connect2
rcvconnect
listen
accept1
accept2
accept3
snd		T_INREL
rcv	T_OUTREL
snddis1	T_IDLE	T_IDLE
snddis2
rcvdis1	T_IDLE	T_IDLE
rcvdis2
rcvdis3
sndrel		T_IDLE
rcvrel	T_IDLE
pass_conn			T_DATAXFER
optmgmt	T_OUTREL	T_INREL	T_UNBND
closed	T_UNINIT	T_UNINIT

Table 3-14 Connectionless Mode State

Event/State	T_IDLE
snudata	T_IDLE
rcvdata	T_IDLE
rcvuderr	T_IDLE