NAME

t_look − look at the current event on a transport endpoint

SYNOPSIS

#include <tiuser.h>

int t_look(fd)
int fd;

DESCRIPTION

This function returns the current event on the transport endpoint specified by fd.  This function enables a transport provider to notify a transport user of an asynchronous event when the user is issuing functions in synchronous mode.  Certain events require immediate notification of the user and are indicated by a specific error, TLOOK, on the current or next function to be executed. 

This function also enables a transport user to poll a transport endpoint periodically for asynchronous events. 

On failure, t_errno may be 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 function. 

SEE ALSO

t_open(3N). 
CX/UX Networking Reference Manual

DIAGNOSTICS

Upon success, t_look 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_DISCONNECT
disconnect received

T_UDERR datagram error indication

T_ORDREL orderly release indication

T_GODATA Flow control restrictions on normal data flow have been lifted and normal data may be sent again. 

T_GOEXDATA Flow control restrictions on expedited data flow have been lifted and expedited data may be sent again. 

On failure, −1 is returned and t_errno is set to indicate the error. 

CX/UX Networking