Look at the current event on a transport endpoint.
X/Open Transport Interface Library (libxti.a)
int t_look (fd) int fd;
The t_look subroutine returns the current event on the transport endpoint specified by the fd parameter. This subroutine enables a transport provider to notify a transport user of an asynchronous event when the user is calling subroutines in synchronous mode. Certain events require immediate notification of the user and are indicated by a specific error, TLOOK, on the current or next subroutine to be executed. Details on events which cause subroutines to fail, T_LOOK, may be found in Section 4.6, Events and TLOOK Error Indication.
This subroutine also enables a transport user to poll a transport endpoint periodically for asynchronous events.
|fd||Specifies the transport endpoint.|
ALL - apart from T_UNINIT.
Upon success, the
t_look subroutine returns a value that indicates which of the
allowable events has occurred, or returns zero if no event exists. One
of the following events is returned:
|T_LISTEN||Connection indication received.|
|T_CONNECT||Connect confirmation received.|
|T_DATA||Normal data received.|
|T_EXDATA||Expedited data received.|
|T_UDERR||Datagram error indication.|
|T_ORDREL||Orderly release indication.|
|T_GODATA||Flow control restrictions on normal data flow that led to a TFLOW error have been lifted. Normal data may be sent again.|
|T_GOEXDATA||Flow control restrictions on expedited data flow that led to a TFLOW error have been lifted. Expedited data may be sent again.|
On failure, -1 is returned and t_errno is set to indicate the error.
On failure, t_errno is
set to one of the following:
|TBADF||The specified file descriptor does not refer to a transport endpoint.|
|TSYSERR||A system error has occurred during execution of this subroutine.|
|TPROTO||This error indicates that a communication problem has been detected between the X/Open Transport Interface and the transport provider for which there is no other suitable X/Open Transport Interface (t_errno).|
Additional functionality is provided through the Event Management (EM) interface.
The t_open subroutine, t_snd subroutine, t_sndudata subroutine.