Tribblix: manual page: t

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

NAME

t_rcvconnect - receive the confirmation from a connection request

SYNOPSIS

#include <xti.h>

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

DESCRIPTION

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.

RETURN VALUES

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.

VALID STATES

T_OUTCON.

ERRORS

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

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

TBUFOVFLW
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.

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

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

TNOTSUPPORT
This function is not supported by the underlying
transport provider.

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

TPROTO
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).

TSYSERR
A system error has occurred during execution of this
function.

TLI COMPATIBILITY

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 zero.

ATTRIBUTES