NAME

t_rcvleafchange - receive an indication about a leaf in a point-to-multipoint connection

SYNOPSIS

#include <xti.h>

int32_t  t_rcvleafchange (fd, change)
int32_t  fd;
struct t_leaf_status *change;

DESCRIPTION

Parameters	Before call	After call
fd	x	/
change.leafid	/	x
change.status	/	x
change.reason	/	?

This function is used to determine the status change of a leaf on a point-to-multipoint connection. This function can only be issued in the T_DATAXFER state. The parameter fd identifies the local connection endpoint that serves as the root of the point-to-multipoint connection, and parameter change points to a t_leaf_status structure containing the following members:

 

int32_t  leafid;
int32_t  status;
int32_t  reason;

The field leafid identifies the leaf whose status has changed, and field status specifies the change (either T_CONNECT or T_DISCONNECT). When status has a value of T_CONNECT, field reason is meaningless. When status has a value of T_DISCONNECT, field reason specifies the reason why the leaf was removed from the point-to-multipoint connection or why a pending addleaf failed, through a protocol-dependent reason code.

VALID STATES

T_DATAXFER

ERRORS

On failure, t_errno is set to one of the following:

[TBADF]

The specified file descriptor does not refer to a transport endpoint. Also used when the connection is not point-to-multipoint.

[TNODATA]

No leaf change indication currently exists on the specified point-to-multipoint connection.

[TOUTSTATE]

The function was issued in the wrong sequence on the transport endpoint referenced by fd.

[TNOTSUPPORT]

This function is not supported by the underlying transport provider.

[TSYSERR]

A system error has occurred during execution of this function.

[TLOOK]

An asynchronous event, which requires attention, has occurred.

[TPROTO]

This error indicates that a communication problem has been detected between XTI and the transport provider for which there is no other suitable XTI t_errno return code.

RETURN VALUE

Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and t_errno is set to indicate the error.

SEE ALSO

t_addleaf(), t_removeleaf().

ATM PROTOCOL SPECIFICS

The parameter reason is an 8-bit cause value that is sent across the ATM network in octet 6 of the Q.2931 Cause information element.