NAME [Toc] [Back]
t_look() - look at the current event on a transport endpoint
SYNOPSIS [Toc] [Back]
#include <xti.h> /* for X/OPEN Transport Interface - XTI */
/* or */
#include <tiuser.h> /* for Transport Layer Interface - TLI */
int t_look (fd);
DESCRIPTION [Toc] [Back]
The t_look() 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
calling 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.
Thread-Safeness [Toc] [Back]
The t_look() function is safe to be called by multithreaded
applications, and it is thread-safe for both POSIX Threads and DCE
User Threads. It has a cancellation point. It is neither asynccancel
safe nor async-signal safe. Finally, it is not fork-safe.
Valid States [Toc] [Back]
All - apart from T_UNINIT.
XTI Internet Protocol-specific Information [Toc] [Back]
As soon as a segment with the TCP urgent pointer set enters the TCP
receive buffer, the event T_EXDATA is indicated. T_EXDATA remains set
until all data up to the byte pointed to by the TCP urgent pointer has
been received. If the urgent pointer is updated, and the user has not
yet received the byte previously pointed to by the urgent pointer, the
update is transparent to the user.
RETURN VALUE [Toc] [Back]
Upon success, t_look() returns a value that indicates which of the
following 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.
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T_ERROR (TLI ONLY) fatal error occurred.
T_EXDATA expedited data received.
T_DISCONNECT disconnect received.
T_UDERR datagram error indication.
T_ORDREL orderly release indication.
T_GODATA (XTI only) flow control restrictions on normal data
flow have been lifted. Normal data may be sent
T_GOEXDATA (XTI only) flow control restrictions on expedited
data flow have been lifted. Expedited data may be
ERRORS [Toc] [Back]
On failure, t_errno is set to one of the following:
[TBADF] The specified identifier does not refer to a
[TSYSERR] A system error has occurred during execution of this
[TPROTO] (XTI only) This error indicates that a communication
problem has been detected between XTI and the
transport provider for which there is no suitable XTI
SEE ALSO [Toc] [Back]
t_open(3), t_snd(3), t_sndudata(3).
STANDARDS CONFORMANCE [Toc] [Back]
t_look(): SVID2, XPG3, XPG4
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