The state 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.
You should understand the following when studying the state tables:
t_close(3NSL) terminates an established connection for a connection-oriented transport provider. The connection termination will be either orderly or abortive, depending on the service type supported by the transport provider. See the t_getinfo(3NSL) man page.
If a transport user issues a interface call out of sequence, the interface 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. The state tables assume correct use of XTI/TLI.
Any other transport error does not change the state, unless the man page for the interface says otherwise.
The support interfaces 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.
Some of the state transitions listed in the tables below offer actions the transport user must take. Each action is represented by a digit derived from the list below:
Set the count of outstanding connect requests to zero
Increment the count of outstanding connect requests
Decrement the count of outstanding connect requests
Pass a connection to another transport endpoint, as indicated in thet_accept(3NSL) man page
The following table shows endpoint establishment states.
Table 8–4 Connection Establishment State
Event/State |
|
|
|
---|---|---|---|
opened |
T_UNBND |
|
|
bind |
|
T_IDLE[1] |
|
|
|
T_IDLE |
|
unbind |
|
|
T_UNBND |
closed |
|
T_UNINIT |
|
The following table shows data transfer in connectionless mode.
Table 8–5 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 |
|
|
|
T_IDLE |
T_OUTCON |
T_INCON |
T_DATAXFER |
|
closed |
T_UNINIT |
T_UNINIT |
T_UNINIT |
T_UNINIT |
The following table shows connection establishment/connection release/data transfer in connection mode.
Table 8–6 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 |
|
| |
optmgmt |
T_OUTREL |
T_INREL |
T_UNBND |
closed |
T_UNINIT |
T_UNINIT |
|
The following table shows connectionless mode states.
Table 8–7 Connectionless Mode State
Event/State |
T_IDLE |
---|---|
snudata |
T_IDLE |
rcvdata |
T_IDLE |
rcvuderr |
T_IDLE |