T_CLOSE(3NSL) Networking Services Library Functions T_CLOSE(3NSL)

NAME

t_close - close a transport endpoint

SYNOPSIS

#include <xti.h>


int t_close(int fd);

DESCRIPTION

This routine is part of the XTI interfaces which 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, the tiuser.h
header file must be used. Refer to the TLI COMPATIBILITY section
for a description of differences between the two interfaces.


The t_close() function informs the transport provider that the user
is finished with the transport endpoint specified by fd, and frees
any local library resources associated with the endpoint. In
addition, t_close() closes the file associated with the transport
endpoint.


The function t_close() should be called from the T_UNBND state. See
t_getstate(3NSL). However, this function does not check state
information, so it may be called from any state to close a transport
endpoint. If this occurs, the local library resources associated
with the endpoint will be freed automatically. In addition, close(2)
will be issued for that file descriptor; if there are no other
descriptors in this process or in another process which references
the communication endpoint, any connection that may be associated
with that endpoint is broken. The connection may be terminated in an
orderly or abortive manner.


A t_close() issued on a connection endpoint may cause data previously
sent, or data not yet received, to be lost. It is the responsibility
of the transport user to ensure that data is received by the remote
peer.

RETURN VALUES

Upon successful completion, a value of 0 is returned. Otherwise, a
value of -1 is returned and t_errno is set to indicate an error.

VALID STATES

T_UNBND

ERRORS

On failure, t_errno is set to the following:

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


TPROTO
This error indicates that a communication problem has been
detected between XTI and the transport provider for which
there is no other suitable XTI error (t_errno).


TSYSERR
A system error has occurred during execution of this
function.

TLI COMPATIBILITY

The XTI and TLI interface definitions have common names but use
different header files. This, and other semantic differences between
the two interfaces are described in the subsections below.

Interface Header

The XTI interfaces use the header file, xti.h. TLI interfaces should
not use this header. They should use the header:


#include <tiuser.h>

Error Description Values

The t_errno value that can be set by the XTI interface and cannot be
set by the TLI interface is:

TPROTO

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|MT Level | Safe |
+---------------+-----------------+

SEE ALSO

close(2), t_getstate(3NSL), t_open(3NSL), t_unbind(3NSL),
attributes(7)

May 7, 1998 T_CLOSE(3NSL)