T_LISTEN(3N)

NAME
t_listen - listen for a connect request

SYNOPSIS

#include <tiuser.h>

int t_listen(fd, call)
int fd;
struct t_call *call;

DESCRIPTION

t_listen() listens for a connect request from a calling transport user. fd identifies the local transport endpoint where connect indications arrive, and on return, call contains information describing the connect indication. call points to a t_call() structure which contains the following members:

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

The maxlen, len, and buf members of the netbuf structure are described in t_accept(3N). In call, addr returns the protocol address of the calling transport user, opt returns protocol-specific parameters associated with the connect request, udata returns any user data sent by the caller on the connect request, and sequence is a number that uniquely identifies the returned connect indication. The value of sequence enables the user to listen for multiple connect indications before responding to any of them.

Since this function returns values for the addr, opt, and udata fields of call, the maxlen field of each must be set before issuing the t_listen() to indicate the maximum size of the buffer for each.

By default, t_listen() executes in synchronous mode and waits for a connect indication to arrive before returning to the user. However, if T_NDELAY is set (using t_open(3N) or fcntl()), t_listen() executes asynchronously, reducing to a poll(2) for existing connect indications. If none are available, it returns -1 and sets t_errno to TNODATA.

RETURN VALUES

t_listen() returns:

0   on success.

-1  on failure and sets t_errno to indicate the error.

ERRORS

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 provider's state, as seen by the user, changes to T_INCON and the connect indication information to be returned in call is discarded.

TLOOK
    An asynchronous event has occurred on this transport endpoint and requires immediate attention.

TNODATA
    T_NDELAY was set, but no connect indications had been queued.

TNOTSUPPORT
    This function is not supported by the underlying transport provider.

TSYSERR
    The function failed due to a system error and set errno to indicate the error.

SEE ALSO
intro(3), t_accept(3N), t_bind(3N), t_connect(3N), t_open(3N), t_rcvconnect(3N)