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Transport Provider Interface (TPI)

Transport Provider Interface (TPI)
Copyright © 1997 The Open Group



Connectionless mode of service, in which the origin and destination addresses are included in each message packet so that a direct connection or established session between origin and destination is not required.


Connection-oriented mode of service, requiring a direct connection or established session between origin and destination.


Internet Protocol


A feature of UNIX that provides a standard way of dynamically building and passing messages up and down a protocol stack. Upstream messages are passed from the network driver through the STREAMS modules to the application. Downstream messages flow from the application to the network driver. A STREAMS module would be a transport layer protocol (e.g. TCP) or a network layer protocol (e.g. IP).


Transmission Control Protocol


Transport Provider Interface

Type Model

A mapping of the C language fundamental types onto the data formats supported by a computer architecture. Examples of type models are ILP32 (char 8 bits, short 16 bits, int, long and pointer 32 bits), and LP64 (char 8 bits, short 16 bits, int 32 bits, long and pointer 64 bits).


UNIX International. This organization developed the original specification for TPI. It was subsequently acquired by UNIX System Laboratories.


UNIX System Laboratories. This organization acquired the TPI specification rights from UI. It was subsequently acquired by Novell Inc.
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