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
See
attributes(7) for descriptions of the following attributes:
+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|MT Level | Safe |
+---------------+-----------------+
SEE ALSO
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)