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Programming Interfaces Guide     Oracle Solaris 11.1 Information Library
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1.  Memory and CPU Management

2.  Session Description Protocol API

3.  Process Scheduler

4.  Locality Group APIs

5.  Input/Output Interfaces

6.  Interprocess Communication

7.  Socket Interfaces

8.  Programming With XTI and TLI

What Are XTI and TLI?

XTI/TLI Read/Write Interface

Write Data

Read Data

Close Connection

Advanced XTI/TLI Topics

Asynchronous Execution Mode

Advanced XTI/TLI Programming Example

Asynchronous Networking

Networking Programming Models

Asynchronous Connectionless-Mode Service

Making the Endpoint Asynchronous

Asynchronous Network Transfers

Asynchronous Connection-Mode Service

Asynchronously Establishing a Connection

Asynchronous Use of a Connection

Asynchronous Open

Transferring a File Descriptor

State Transitions

XTI/TLI States

Outgoing Events

Incoming Events

State Tables

Guidelines to Protocol Independence

XTI/TLI Versus Socket Interfaces

Socket-to-XTI/TLI Equivalents

Additions to the XTI Interface

9.  Packet Filtering Hooks

10.  Transport Selection and Name-to-Address Mapping

11.  Real-time Programming and Administration

12.  The Oracle Solaris ABI and ABI Tools

A.  UNIX Domain Sockets


What Are XTI and TLI?

Note - The interfaces described in this chapter are multithread safe. This means that applications containing XTI/TLI interface calls can be used freely in a multithreaded application. Because these interface calls are not re-entrant, they do not provide linear scalability.


Caution - The XTI/TLI interface behavior has not been well specified in an asynchronous environment. Do not use these interfaces from signal handler routines.

TLI was introduced with AT&T System V, Release 3 in 1986. TLI provided a transport layer interface API. The ISO Transport Service Definition provided the model on which TLI is based. TLI provides an API between the OSI transport and session layers. TLI interfaces evolved further in AT&T System V, Release 4 version of UNIX and were also made available in SunOS 5.6 operating system interfaces.

XTI interfaces are an evolution of TLI interfaces and represent the future direction of this family of interfaces. Compatibility for applications using TLI interfaces is available. You do not need to port TLI applications to XTI immediately. New applications can use the XTI interfaces and you can port older applications to XTI when necessary.

TLI is implemented as a set of interface calls in a library (libnsl) to which the applications link. XTI applications are compiled using the c89 front end and must be linked with the xnet library (libxnet). For additional information on compiling with XTI, see the standards(5) man page.

Note - An application using the XTI interface uses the xti.h header file, whereas an application using the TLI interface includes the tiuser.h header file.

XTI/TLI code can be independent of current transport providers when used in conjunction with some additional interfaces and mechanisms described in Chapter 4. The SunOS 5 product includes some transport providers (TCP, for example) as part of the base operating system. A transport provider performs services, and the transport user requests the services. The transport user issues service requests to the transport provider. An example is a request to transfer data over a connection TCP and UDP.

XTI/TLI can also be used for transport-independent programming by taking advantage of two components: