T_LOOK(3N)                           SysV                           T_LOOK(3N)



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.

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_ERROR            fatal error indication

     T_UDERR            datagram error indication

     T_ORDREL           orderly release indication

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

ERRORS
     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)
     Programming with the SysV Transport Interface