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Name

t_rcvconnect - receive the confirmation from a connect request

Synopsis

cc [ flag ... ] file ... -lnsl [ library ... ]

#include <tiuser.h>

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

MT-Level

MT-Safe

Description

This function enables a calling transport user to determine the status of a previously sent connect request and is used in conjunction with t_connect(3N) to establish a connection in asynchronous mode. The connection will be established on successful completion of this function.

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


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

netbuf is described in t_connect(3N) . 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 (see netbuf in t_connect(3N) ) 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(). 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_NDELAY or O_NONBLOCK is set (using t_open(3N) or fcntl(2) ), t_rcvconnect() executes in asynchronous mode, and reduces to a poll for existing connect confirmations. If none are available, t_rcvconnect() fails and returns immediately without waiting for the connection to be established. (See TNODATA below.) t_rcvconnect() must be re-issued at a later time to complete the connection establishment phase and retrieve the information returned in call.

Return Values

t_rcvconnect() returns 0 on success. On failure t_rcvconnect() returns -1, t_errno is set to indicate the error, and possibly errno is set.

Errors

On failure, t_errno will be 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 is not sufficient to store the value of that argument and 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 .
TLOOK
An asynchronous event has occurred on this transport connection and requires immediate attention.
TNODATA
O_NDELAY or O_NONBLOCK was set, but a connect confirmation has not yet arrived.
TNOTSUPPORT
This function is not supported by the underlying transport provider.
TSYSERR
A system error has occurred during execution of this function, errno will be set to the specific error.

See Also

fcntl(2) , t_accept(3N) , t_bind(3N) , t_connect(3N) , t_listen(3N) , t_open(3N)

Notes

This interface is safe in multithreaded applications.

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