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t_rcvconnect(3)
NAME
t_rcvconnect - Receive the confirmation from a connect request
SYNOPSIS
#include <xti.h>
int t_rcvconnect(
int fd,
struct t_call *call );
LIBRARY
XTI Library (libxti.a)
STANDARDS
Interfaces documented on this reference page conform to industry standards
as follows:
t_rcvconnect(): XNS4.0, XNS5.0
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
PARAMETERS
The following table summarizes the relevance of input and output parameters
before and after t_rcvconnect() is called:
_____________________________________________
Parameter Before Call After Call
_____________________________________________
fd y n
call->addr.maxlen y n
call->addr.len n y
call->addr.buf o (o)
call->opt.maxlen y n
call->opt.len n y
call->opt.buf o (o)
call->udata.maxlen y n
call->udata.len n y
call->udata.buf o (o)
call->sequence n n
_____________________________________________
Notes to Table
y This is a meaningful parameter.
n This is not a meaningful parameter.
(o) The content of the object pointed to by o is optional.
(y) The content of the object pointed to by y is meaningful.
fd Specifies a file descriptor returned by the t_open() function that
identifies the local transport endpoint where the connection is to be
established.
call
Points to a type t_call structure, used to reserve space for a buffer
that stores information associated with the connection at the transport
endpoint referenced by the fd parameter. When the call parameter is set
to the null pointer value, no data is returned to the caller. The
t_call structure has the following members:
struct netbuf addr
References a buffer for protocol address information returned from
the transport endpoint specified by the fd parameter. The type
netbuf structure referenced by this member is defined in the xti.h
include file and has the following members:
unsigned int maxlen
Specifies the maximum byte length of the data buffer.
unsigned int len
Specifies the actual byte length of data written to the buffer.
char *buf
Points to the buffer location.
struct netbuf opt
Specifies a buffer for protocol-specific parameters associated with
the connection.
struct netbuf udata
Specifies a buffer for transport user data sent from the
destination transport user.
int sequence
This parameter is not meaningful for the t_rcvconnect() function.
The addr parameters pointed to by the call parameter specify protocol
address information associated with the responding transport endpoint.
Before this function is called, the addr.maxlen parameter must be set to
specify the maximum byte length of the protocol-address buffer pointed to
by the addr.buf parameter, which is used to hold the protocol address of
the responding transport endpoint.
On return, the addr.len parameter specifies the actual transport endpoint
protocol-address byte length and the buffer pointed to by addr.buf contains
the transport endpoint protocol address.
The opt parameters pointed to by the call parameter specify optional
information associated with the responding transport endpoint. Before this
function is called, the opt.maxlen parameter must be set to specify the
maximum byte length of the options-data buffer pointed to by the opt.buf
parameter, which is used to hold optional information from the responding
transport endpoint when it is provided.
On return, the opt.len parameter specifies the actual transport endpoint
optional-data byte length and the data buffer pointed to by opt.buf
contains transport endpoint optional data.
The udata parameters pointed to by the call parameter specify user
information associated with the responding transport endpoint. Before this
function is called, the udata.maxlen parameter must be set to specify the
maximum byte length of the user-data buffer pointed to by the udata.buf
parameter, which is used to hold remote transport user information from the
responding transport endpoint when it is provided.
On return, the udata.len parameter specifies the actual transport endpoint
user-data byte length and the data buffer pointed to by udata.buf contains
transport endpoint user data.
DESCRIPTION
The t_rcvconnect() XTI function enables a calling transport user to
determine the status of a previously sent connect request at a transport
endpoint specified by a file descriptor returned by the t_open() function.
The t_rcvconnect() function is used in conjunction with the t_connect()
function to establish a connection in asynchronous mode. By default, this
function executes in synchronous mode, waiting for the connection to be
established before returning control to the caller.
However, when the transport endpoint specified by the fd file descriptor
has been opened with the O_NONBLOCK option set in the t_open() or t_fcntl()
functions, the t_connect() function executes in asynchronous mode. In
asynchronous mode, when no connection confirmation is available, control is
immediately returned to the caller. In this case, t_rcvconnect() must be
called again to complete the connection establishment and retrieve the
information in the call parameter.
The t_rcvconnect() function uses type t_call and netbuf structures, which
are defined in the xti.h include file.
ERRORS
If the t_rcvconnect() function fails, t_errno may be set to one of the
following values:
[TBADF]
The specified file descriptor does not refer to a transport endpoint.
[TBUFOVFLW]
The number of bytes allocated for incoming data is not sufficient for
storage of that data. The connect information normally returned to the
call parameter is discarded. The transport provider state is changed
to T_DATAXFER.
[TNODATA]
Asynchronous mode is indicated because O_NONBLOCK was set, but no
connect confirmation is currently available from the transport
provider.
[TLOOK]
An asynchronous event has occurred on this transport connection and
requires immediate attention (refer to the t_look() function).
[TOUTSTATE]
The function was issued in the wrong sequence on the transport endpoint
referenced by the fd parameter.
[TSYSERR]
A system error occurred during execution of this function.
[TNOTSUPPORT]
This function is not supported by the underlying transport provider.
[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(t_errno).
VALID STATES
The t_rcvconnect() function can only be called in the T_OUTCON transport
provider state.
RETURN VALUE
Upon successful completion, a value of 0 (zero) is returned. Otherwise, a
value of -1 is returned and t_errno is set to indicate the error.
SEE ALSO
Functions: t_accept(3), t_alloc(3), t_bind(3), t_connect(3), t_listen(3),
t_open(3), t_optmgmt(3)
Standards: standards(5)
Network Programmer's Guide
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