T_RCVCONNECT(3NSL) Networking Services Library Functions T_RCVCONNECT(3NSL)


t_rcvconnect - receive the confirmation from a connection request


#include <xti.h>

int t_rcvconnect(int fd, struct t_call *call);


This routine is part of the XTI interfaces which evolved from the TLI
interfaces. XTI represents the future evolution of these interfaces.
However, TLI interfaces are supported for compatibility. When using a TLI
routine that has the same name as an XTI routine, the tiuser.h header
file must be used. Refer to the TLI COMPATIBILITY section for a
description of differences between the two interfaces.

This function enables a calling transport user to determine the status of
a previously sent connection request and is used in conjunction with
t_connect(3NSL) to establish a connection in asynchronous mode, and to
complete a synchronous t_connect(3NSL) call that was interrupted by a
signal. The connection will be established on successful completion of
this function.

The argument fd identifies the local transport endpoint where
communication will be established, and call contains information
associated with the newly established connection. The argument call
points to a t_call structure which contains the following members:

struct netbuf addr;
struct netbuf opt;
struct netbuf udata;
int sequence;

In call, addr returns the protocol address associated with the responding
transport endpoint, opt presents any options associated with the
connection, udata points to optional user data that may be returned by
the destination transport user during connection establishment, and
sequence has no meaning for this function.

The maxlen field of each argument must be set before issuing this
function to indicate the maximum size of the buffer for each. However,
maxlen can be set to zero, in which case no information to this specific
argument is given to the user on the return from t_rcvconnect(). If call
is set to NULL, no information at all is returned. By default,
t_rcvconnect() executes in synchronous mode and waits for the connection
to be established before returning. On return, the addr, opt and udata
fields reflect values associated with the connection.

If O_NONBLOCK is set by means of t_open(3NSL) or fcntl(2), t_rcvconnect()
executes in asynchronous mode, and reduces to a poll for existing
connection confirmations. If none are available, t_rcvconnect() fails and
returns immediately without waiting for the connection to be established.
See TNODATA below. In this case, t_rcvconnect() must be called again to
complete the connection establishment phase and retrieve the information
returned in call.


Upon successful completion, a value of 0 is returned. Otherwise, a value
of -1 is returned and t_errno is set to indicate an error.




On failure, t_errno is set to one of the following:

The specified file descriptor does not refer to a
transport endpoint.

The number of bytes allocated for an incoming argument
(maxlen) is greater than 0 but not sufficient to store the
value of that argument, and the connection information to
be returned in call will be discarded. The provider's
state, as seen by the user, will be changed to T_DATAXFER.

An asynchronous event has occurred on this transport
connection and requires immediate attention.

O_NONBLOCK was set, but a connection confirmation has not
yet arrived.

This function is not supported by the underlying transport

The communications endpoint referenced by fd is not in one
of the states in which a call to this function is valid.

This error indicates that a communication problem has been
detected between XTI and the transport provider for which
there is no other suitable XTI error (t_errno).

A system error has occurred during execution of this


The XTI and TLI interface definitions have common names but use different
header files. This, and other semantic differences between the two
interfaces are described in the subsections below.

Interface Header

The XTI interfaces use the header file, xti.h. TLI interfaces should not
use this header. They should use the header:
#include <tiuser.h>

Error Description Values

The t_errno value TPROTO can be set by the XTI interface but not by the
TLI interface.

A t_errno value that this routine can return under different
circumstances than its XTI counterpart is TBUFOVFLW. It can be returned
even when the maxlen field of the corresponding buffer has been set to


See attributes(7) for descriptions of the following attributes:

|MT Level | Safe |


fcntl(2), t_accept(3NSL), t_alloc(3NSL), t_bind(3NSL), t_connect(3NSL),
t_listen(3NSL), t_open(3NSL), t_optmgmt(3NSL), attributes(7)

June 18, 2021 T_RCVCONNECT(3NSL)