t_look(3xti)t_look(3xti)Namet_look - look at the current event on a transport endpoint
Syntax
#include <xti.h>
int t_look(fd)
int fd;
Arguments
fd Identifies the transport endpoint where the current event is
returned.
Description
This function returns the current event on the transport endpoint spec‐
ified by fd. This function enables a transport provider to notify a
transport user of an asynchronous event when the user is issuing func‐
tions in synchronous mode. Certain events require immediate notifica‐
tion 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 end‐
point periodically for asynchronous events.
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Parameters Before Call After Call
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fd x /
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Return Values
Upon successful completion, 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. Normal data can be
sent again.
T_GOEXDATA Flow control restrictions on expedited data
flow have been lifted. Expedited data can
be sent again.
On failure, -1 is returned, and t_errno is set to indicate the error.
Diagnostics
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 function.
See Alsot_open(3xti), t_snd(3xti), t_sndudata(3xti)t_look(3xti)
