t_rcvconnect(3xti)
Name
t_rcvconnect − receive the confirmation from a connect request
Syntax
#include <xti.h>
int t_rcvconnect(fd, call)
int fd;
struct t_call *call;
Arguments
fdIdentifies the local transport endpoint where communications is established.
callContains information associated with the newly established connection. Call points to a t_call structure that contains the following members:
struct netbuf addr;
struct netbuf opt;
struct netbuf udata;
int sequence;
The members of the t_call structure have the following meanings:
addrReturns the protocol address associated with the responding transport endpoint.
optPresents any protocol-specific information associated with the transport endpoint.
udataPoints to any optional user data that may be returned by the destination transport user during connection establishment.
sequenceHas no meaning for this function.
Description
This function enables a calling transport user to determine the status of a previously sent connect request. Is used in conjunction with t_connect() to establish a connection in asynchronous mode. The connection is established on successful completion of 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 can 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.
| Parameters | Before Call | After Call |
| fd | x | / |
| call->addr.maxlen | x | / |
| call->addr.len | / | x |
| call->addr.buf | x | (x) |
| call->opt.maxlen | x | / |
| call->opt.len | / | x |
| call->opt.buf | x | (x) |
| call->udata.maxlen | x | / |
| call->udata.len | / | x |
| call->udata.buf | x | (?) |
| call->sequence | / | / |
If O_NONBLOCK is set by means of t_open() or fcntl(), t_rcvconnect() executes in asynchronous mode and reduces to a poll for existing connect confirmations. If none is available, t_rcvconnect() fails and returns immediately without waiting for the connection to be established. The t_rcvconnect() function must be reissued at a later time to complete the connection establishment phase and retrieve the information returned to call.
Return Values
Upon successful completion, a value of 0 is returned. On failure, a value of −1 is returned, and t_errno is set to indicate the error.
Diagnostics
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 is not sufficient to store the value of that argument. The connect information to be returned in call is discarded. The provider’s state, as seen by the user, is 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 and requires immediate attention.
[TNOTSUPPORT] This function is not supported by the underlying transport provider.
[TOUTSTATE] The function was issued in the wrong sequence on the transport endpoint referenced by fd.
[TSYSERR] A system error has occurred during execution of this function.
See Also
t_accept(3xti), t_alloc(3xti), t_bind(3xti), t_connect(3xti), t_listen(3xti), t_open(3xti), t_optmgmt(3xti)