t_rcvconnect(NET)

t_rcvconnect -- receive the confirmation from a connect request

Synopsis

cc [options] file -lnsl

#include <xti.h>

int t_rcvconnect(int fd, struct t_call call)

Description

This function is a routine for establishing a transport connection. t_rcvconnect enables a calling transport user to determine the status of a connect request that it issued to a responding transport endpoint. On successful completion of t_rcvconnect, the connection is initiated with an asynchronous t_connect is established.

By default, t_rcvconnect executes in synchronous mode and waits for the connection to be established before returning.

fd identifies the responding transport endpoint, and on return call contains information associated with the newly established connection.

Parameters

fd: the file descriptor for the transport endpoint where communication will be established.
call: points to the t_call structure used to identify the transport user that will receive the connection indication.

Structure definitions

The call argument points to a t_call structure which contains the following members:

   struct netbuf addr;    /* address          */
   struct netbuf opt;     /* options          */
   struct netbuf udata;   /* user data        */
   int sequence;          /* sequence number  */

netbuf is described in intro(NET). In call, addr returns the protocol address associated with the responding transport endpoint, opt presents any protocol-specific information 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, call may be NULL, in which case no information is given to the user on return from t_rcvconnect.

On return, the addr, opt, and udata fields reflect values associated with the connection.

If O_NONBLOCK is set (via t_open or fcntl), t_rcvconnect executes in asynchronous mode, and reduces to a poll for existing connect confirmations. If none are available, t_rcvconnect fails on a TNODATA error and returns immediately without waiting for the connection to be established.

State transitions

On entry, T_OUTCON; T_DATAXFER (successful) or T_OUTCON (failed) on exit.

Files

/usr/lib/libxti.so: X/Open^® Transport Interface Library (shared object)
/usr/lib/libnsl.so: Network Services Library (shared object)

Usage

A subsequent call to t_rcvconnect is required to complete the connection establishment phase and retrieve the information returned in call.

Return values

t_rcvconnect returns 0 on success and -1 on failure and t_errno is set to indicate the error.

Errors

On failure, t_errno may be set to one of the following:

TBADF: The specified file descriptor does not refer to a transport endpoint.
TBUFOVFLW: The number of bytes (maxlen) allocated for an incoming argument is greater than zero but not sufficient to store the value of that argument. The connect information to be returned in call will be discarded. The provider's state, as seen by the user, will be changed to DATAXFER.
TNODATA: O_NONBLOCK was set, but a connect confirmation has not yet arrived.
TLOOK: An asynchronous event has occurred on the transport connection specified by fd and requires immediate attention.
TNOTSUPPORT: This function is not supported by the underlying transport provider.
TSYSERR: A system error has occurred during execution of this function.
TOUTSTATE: The function was issued in the wrong sequence on the transport endpoint referenced by fd.
TPROTO: A communication problem has been detected with the transport provider and there is no other value of t_errno to describe the error condition.

References

fcntl(S), intro(NET), t_accept(NET), t_bind(NET), t_connect(NET), t_listen(NET), t_open(NET), t_optmgmt(NET)