Listens for a connect request.
Transport Layer Interface Library (libtli.a)
int t_listen(fd, call) int fd; struct t_call *call;
The t_listen subroutine listens for a connect request from a calling transport user.
Note: If a user issues a t_listen subroutine call in synchronous mode on a transport end point that was not bound for listening (that is, the qlen field was 0 on the t_bind subroutine), the call will never return because no connect indications will arrive on that endpoint.
|fd||Identifies the local transport endpoint where connect indications arrive.|
|call|| Contains information describing the connect indication.
Since the t_listen subroutine returns values for the addr , opt , and udata fields of the call parameter, the maxlen field of each must be set before issuing the t_listen subroutine to indicate the maximum size of the buffer for each.
By default, the t_listen subroutine executes in synchronous mode and waits for a connect indication to arrive before returning to the user. However, if the O_NDELAY or O_NONBLOCK flag is set (using the t_open subroutine or the fcntl command), the t_listen subroutine executes asynchronously, reducing to a poll for existing connect indications. If none are available, the t_listen subroutine returns -1 and sets the t_errno variable to TNODATA.
On successful completion, the t_listen subroutine returns a value of 0. Otherwise, it returns a value of -1, and the t_errno variable is set to indicate the error.
If unsuccessful, the t_errno variable is set to one of the following:
|TBADF||The specified file descriptor does not refer to a transport end point.|
|TBADQLEN||The transport end point is not bound for listening. The qlen is zero.|
|TBUFOVFLW||The number of bytes allocated for an incoming argument is not sufficient to store the value of that argument. The provider's state, as seen by the user, changes to T_INCON, and the connect-indication information to be returned in the call parameter is discarded.|
|TLOOK||An asynchronous event has occurred on this transport end point and requires immediate attention.|
|TNODATA||The O_NDELAY or O_NONBLOCK flag was set, but no connect indications had been queued.|
|TNOTSUPPORT||This function is not supported by the underlying transport provider.|
|TOUTSTATE||The subroutine was issued in the wrong sequence.|
|TSYSERR||A system error has occurred during execution of this function.|
This subroutine is part of Base Operating System (BOS) Runtime.
The t_accept subroutine, t_alloc subroutine, t_bind subroutine, t_connect subroutine, t_open subroutine, t_rcvconnect subroutine.
List of Streams Programming References and STREAMS Overview in AIX Version 4.3 Communications Programming Concepts.