Networking Services Library Functions t_accept(3NSL)
NAME
t_accept - accept a connection request
SYNOPSIS
#include
int t_accept(int fd, int resfd, const struct t_call *call);
DESCRIPTION
This routine is part of the XTI interfaces that evolved from the TLI interfaces. XTI represents the future evolution of these interfaces. However, TLI interfaces are supported for compatibility. When using a TLI routine that has the same name as an XTI routine, a different header file, tiuser.h, must be used. Refer to the TLI COMPATIBILITY section for a description of differences between the two interfaces.This function is issued by a transport user to accept a con-
nection request. The parameter fd identifies the local transport endpoint where the connection indication arrived;resfd specifies the local transport endpoint where the con-
nection is to be established, and call contains informationrequired by the transport provider to complete the connec-
tion. The parameter call points to a t_call structure which
contains the following members: struct netbuf addr; struct netbuf opt; struct netbuf udata; int sequence;In call, addr is the protocol address of the calling tran-
sport user, opt indicates any options associated with the connection, udata points to any user data to be returned to the caller, and sequence is the value returned byt_listen(3NSL) that uniquely associates the response with a
previously received connection indication. The address of the caller, addr may be null (length zero). Where addr is not null then it may optionally be checked by XTI. A transport user may accept a connection on either the same, or on a different, local transport endpoint than the one onwhich the connection indication arrived. Before the connec-
tion can be accepted on the same endpoint (resfd==fd), theSunOS 5.11 Last change: 1 May 1998 1
Networking Services Library Functions t_accept(3NSL)
user must have responded to any previous connection indica-
tions received on that transport endpoint by means oft_accept() or t_snddis(3NSL). Otherwise, t_accept() will
fail and set t_errno to TINDOUT.
If a different transport endpoint is specified (resfd!=fd), then the user may or may not choose to bind the endpointbefore the t_accept() is issued. If the endpoint is not
bound prior to the t_accept(), the endpoint must be in the
T_UNBND state before the t_accept() is issued, and the
transport provider will automatically bind it to an addressthat is appropriate for the protocol concerned. If the tran-
sport user chooses to bind the endpoint it must be bound to a protocol address with a qlen of zero and must be in theT_IDLE state before the t_accept() is issued.
Responding endpoints should be supplied to t_accept() in
the state T_UNBND.
The call to t_accept() may fail with t_errno set to TLOOK
if there are indications (for example connect or disconnect) waiting to be received on endpoint fd. Applications should be prepared for such a failure. The udata argument 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 in the connect field of the info argument oft_open(3NSL) or t_getinfo(3NSL). If the len field of udata
is zero, no data will be sent to the caller. All the maxlen fields are meaningless.When the user does not indicate any option (call->opt.len =
0) the connection shall be accepted with the option values currently set for the responding endpoint resfd.RETURN VALUES
Upon successful completion, a value of 0 is returned. Oth-
erwise, a value of -1 is returned and t_errno is set to
indicate an error. VALID STATESfd: T_INCON
resfd (fd!=resfd): T_IDLE, T_UNBND
SunOS 5.11 Last change: 1 May 1998 2
Networking Services Library Functions t_accept(3NSL)
ERRORS
On failure, t_errno is set to one of the following:
TACCES The user does not have permission to accept a connection on the responding transport endpoint or to use the specified options. TBADADDR The specified protocol address was in an incorrect format or contained illegal information. TBADDATA The amount of user data specified was not within the bounds allowed by the transport provider. TBADF The file descriptor fd or resfd does not refer to a transport endpoint. TBADOPT The specified options were in an incorrect format or contained illegal information. TBADSEQ Either an invalid sequence number was specified, or a valid sequence number was specified but the connection request was aborted by the peer. In the latter case,its T_DISCONNECT event will be received on
the listening endpoint. TINDOUT The function was called with fd==resfd butthere are outstanding connection indica-
tions on the endpoint. Those other connec-
tion indications must be handled either byrejecting them by means of t_snddis(3NSL)
or accepting them on a different endpointby means of t_accept.
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.SunOS 5.11 Last change: 1 May 1998 3
Networking Services Library Functions t_accept(3NSL)
TOUTSTATE The communications endpoint referenced by fd or resfd is not in one of the states in which a call to this function is valid. TPROTO This error indicates that a communication problem has been detected between XTI and the transport provider for which there isno other suitable XTI error (t_errno).
TPROVMISMATCH The file descriptors fd and resfd do not refer to the same transport provider. TRESADDR This transport provider requires both fd and resfd to be bound to the same address. This error results if they are not. TRESQLEN The endpoint referenced by resfd (where resfd != fd) was bound to a protocol address with a qlen that is greater than zero.TSYSERR A system error has occurred during execu-
tion of this function. TLI COMPATIBILITY The XTI and TLI interface definitions have common names butuse different header files. This, and other semantic differ-
ences between the two interfaces are described in the sub-
sections below. Interface HeaderThe XTI interfaces use the header file, xti.h. TLI inter-
faces should not use this header. They should use the header:#include
Error Description ValuesThe t_errno values that can be set by the XTI interface and
cannot be set by the TLI interface are: TPROTOSunOS 5.11 Last change: 1 May 1998 4
Networking Services Library Functions t_accept(3NSL)
TINDOUT TPROVMISMATCH TRESADDR TRESQLEN Option Buffer The format of the options in an opt buffer is dictated by the transport provider. Unlike the XTI interface, the TLI interface does not specify the buffer format.ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| MT Level | Safe ||_____________________________|_____________________________|
SEE ALSO
t_connect(3NSL), t_getinfo(3NSL), t_getstate(3NSL),
t_listen(3NSL), t_open(3NSL), t_optmgmt(3NSL),
t_rcvconnect(3NSL), t_snddis(3NSL), attributes(5)
WARNINGSThere may be transport provider-specific restrictions on
address binding.Some transport providers do not differentiate between a con-
nection indication and the connection itself. If the con-
nection has already been established after a successfulreturn of t_listen(3NSL), t_accept() will assign the exist-
ing connection to the transport endpoint specified by resfd.SunOS 5.11 Last change: 1 May 1998 5