State Tables

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

The following table shows data transfer in connection 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 optmgmt 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 T_DATAXFER 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