t_close(3N)
NAME
t_close − close a transport endpoint
SYNOPSIS
cc [ flag ... ] file ... −lnsl [ library ... ]
#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, a different header file, tiuser.h , must be used. Refer to the section, TLI COMPATIBILITY , 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 t_close() function should be called from the T_UNBND state (see t_getstate(3N)). 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() will be issued for that file descriptor; if there are no other descriptors in this process or in another process which references the communications endpoint, any connection that may be associated with that endpoint will be broken when the close() function is called.
The connection may be terminated in an orderly or abortive manner depending on the service type supported by the underlying transport provider.
Issuing a t_close() function 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.
VALID STATES
Legitimate states (see t_getstate(3N)) for a call to this routine are every one except T_UNINIT .
RETURN VALUES
t_close returns:
0 On success.
−1 On failure.
On failure, t_errno is set to indicate the error, and possibly errno is set.
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 t_errno.
TSYSERR A system error occurred during execution of this function, errno will be set to the specific error.
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
For more information refer to the Transport Interfaces Programming Guide.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| MT-Level | MT-Safe |
SEE ALSO
close(2), t_getstate(3N), t_open(3N), t_unbind(3N), attributes(5)
Transport Interfaces Programming Guide
SunOS 5.6 — Last change: 10 Feb 1997