t_sndreldata(3)t_sndreldata(3)NAMEt_sndreldata - Initiate or respond to an orderly release with user data
SYNOPSIS
#include <xti.h>
int t_sndreldata(
int fd,
struct t_discon *discon );
LIBRARY
XTI Library (libxti.a)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
t_sndreldata(): XNS5.0
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
PARAMETERS
The following table summarizes the relevance of input and output param‐
eters before and after t_sndreldata() is called:
────────────────────────────────────────────────
Parameters Before Call After Call
────────────────────────────────────────────────
fd y n
discon->udata.maxlen y e
discon->udata.len y n
discon->udata.buf o(o) n
discon->reason o n
discon->sequence n n
────────────────────────────────────────────────
Notes to Table: This is a meaningful parameter. The content of the
object pointed to by y is meaningful. This is a meaningful but
optional parameter. The content of the object pointed to by o is mean‐
ingful. The parameter value after the call is the same as before the
call. This is not a meaningful parameter. Identifies the local trans‐
port endpoint where the connection exists. Points to a t_discon struc‐
ture that contains the following members: Identifies any user data that
was sent with the disconnection. Specifies a protocol-dependent reason
code that explains the disconnection. Unused.
If a user does not wish to send data and reason code to the
remote user, the value of discon may be a null pointer.
DESCRIPTION
The t_sndreldata() function is an XTI connection mode service function
that is used to initiate an orderly release of the outgoing direction
of data transfer and to send user data with the release.
After calling t_sndreldata(), the user may not send any more data over
the connection. However, a user may continue to receive data if an
orderly release indication has not been received.
The reason field specifies the reason for the disconnection through a
protocol-dependent reason code, and udata identifies any user data that
is sent with the disconnection; the sequence field is not used.
The udata structure specifies the user data to be sent to the remote
user. The amount of user data must not exceed the limits supported by
the transport provider, as returned in the discon field of the info
argument of t_open() or t_getinfo(). If the len field of udata is zero
or if the provider did not return T_ORDRELDATA in the t_open() flags,
no data will be sent to the remote user.
This function is an optional service of the transport provider, only
supported by providers of service type T_COTS_ORD. The T_ORDRELDATA
flagin the info->flag field returned by t_open() or t_getinfo() indi‐
cates that the provider supports orderly release user data; when the
flag is not set, this function behaves as t_rcvrel() and no user data
is returned.
This function may not be available on all systems.
ERRORS
If the t_sndreldata() function fails, t_errno may be set to one of the
following values: The amount of user data specified was not within the
bounds allowed by the transport provider, or user data was supplied and
the provider did not return T_ORDRELDATA in the t_open() flags. File
descriptor (fd) is not a valid transport endpoint. O_NONBLOCK was set,
but the flow control mechanism prevented the transport provider from
accepting the function. An asynchronous event occurred on this trans‐
port endpoint and requires immediate attention. Orderly release is not
supported by the underlying transport provider. The communications
endpoint referenced by fd is not in a valid state in which a call to
this function. A communication problem has been detected between XTI
and the transport provider for which there is no other suitable XTI
error (t_errno). A system error occurred during execution of this
function.
VALID STATES
The t_sndreldata() function can be called in either the T_DATAXFER or
T_OUTREL transport provider states.
RETURN VALUE
Upon successful completion, a value of 0 (zero) is returned. Otherwise,
a value of -1 is returned and t_errno is set to indicate the error.
SEE ALSO
Functions: t_getinfo(3), t_open(3), t_rcvrel(3), t_rcvreldata(3),
t_sndrel(3).
Standards: standards(5)
Network Programmer's Guide
t_sndreldata(3)
