T_ACCEPT(3N)

NAME
t_accept - accept a connect request

SYNOPSIS

#include <tiuser.h>

int t_accept(fd, resfd, call)
int fd;
int resfd;
struct t_call *call;

DESCRIPTION

t_accept() is issued by a transport user to accept a connect request. fd identifies the local transport endpoint where the connect indication arrived, resfd specifies the local transport endpoint where the connection is to be established, and call contains information required by the transport provider to complete the connection. call points to a t_call structure which contains the following members:
    	struct netbuf addr;
    	struct netbuf opt;
    	struct netbuf udata;
    	int sequence;

The netbuf structure contains the following members:

    unsigned int maxlen;
    unsigned int len;
    char *buf;

buf points to a user input and/or output buffer. len generally specifies the number of bytes contained in the buffer. If the structure is used for both input and output, the transport function will replace the user value of len on return. maxlen generally has significance only when buf is used to receive output from the transport function. In this case, it specifies the physical size of the buffer, and the maximum value of len that can be set by the function. If maxlen is not large enough to hold the returned information, a TBUFOVFLW error will generally result. However, certain functions may return part of the data and not generate an error. In call, addr is the address of the caller, opt indicates any protocol-specific parameters associated with the connection, udata points to any user data to be returned to the caller, and sequence is the value returned by t_listen(3N) that uniquely associates the response with a previously received connect indication.

A transport user may accept a connection on either the same, or on a different, local transport endpoint than the one on which the connect indication arrived. If the same endpoint is specified (resfd = fd), the connection can be accepted unless the following condition is true: The user has received other indications on that endpoint but has not responded to them (with t_accept() or t_snddis(3N)). For this condition, t_accept() will fail and set t_errno to TBADF.

If a different transport endpoint is specified (resfd != fd), the endpoint must be bound to a protocol address and must be in the T_IDLE state (see t_getstate(3N)) before the t_accept() is issued.

For both types of endpoints, t_accept() will fail and set t_errno to TLOOK if there are indications (such as a connect or disconnect) waiting to be received on that endpoint.

The values of parameters specified by opt and the syntax of those values are protocol specific. The udata field enables the called transport user to send user data to the caller and the amount of user data must not exceed the limits supported by the transport provider as returned by t_open(3N) or t_getinfo(3N). If the len field of udata is zero, no data will be sent to the caller.

RETURN VALUES

t_accept() returns:

0   on success.

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

ERRORS

TACCES
    The user does not have permission to accept a connection on the responding transport endpoint.

    The user does not have permission to use the specified options.

TBADDATA
    The amount of user data specified was not within the bounds allowed by the transport provider.

TBADF
    The specified file descriptor does not refer to a transport endpoint.

    The user is illegally accepting a connection on the same transport endpoint on which the connect indication arrived.

TBADOPT
    The specified options were in an incorrect format or contained illegal information.

TBADSEQ
    An invalid sequence number was specified.

TLOOK
    An asynchronous event has occurred on the transport endpoint referenced by fd 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.

    The transport endpoint referred to by resfd is not in the T_IDLE state.

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

SEE ALSO
intro(3), t_connect(3N), t_getstate(3N), t_listen(3N), t_open(3N), t_rcvconnect(3N)