STREAMS


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STREAMS

(operating system)
A collection of system calls, kernel resources, and kernel utility routines that can create, use, and dismantle a stream. A "stream head" provides the interface between the stream and the user processes. Its principal function is to process STREAMS-related user system calls. A "stream module" processes data that travel bewteen the stream head and driver. The "stream end" provides the services of an external input/output device or an internal software driver. The internal software driver is commonly called a pseudo-device driver.

The STREAMS concept has been formalised in Unix System V. For example, SVR4 implements sockets and pipes using STREAMS, resulting in pipe(2) openning bidirectional pipes.

[IBM AIX 3.2 Communication Programming Concepts, SC23-2206-03].

STREAMS

A feature of Unix System V that provides a standard way of dynamically building and passing messages up and down a protocol stack. STREAMS passes messages from the application "downstream" through the STREAMS modules to the network driver at the end of the stack. Messages are passed "upstream" from the driver to the application. A STREAMS module would be a transport layer protocol such as TCP and SPX or a network layer protocol such as IP and IPX.

STREAMS modules can be dynamically changed (pushed and popped) at runtime, allowing the stack to be used for multiple protocols. Two important STREAMS components are the TLI and LSL interfaces, which provide common languages to the transport and data link layers. See TLI, LSL, ODI and OSI.
References in classic literature ?
On the 24th, the travellers took final leave of the Sweet Water, and keeping westwardly, over a low and very rocky ridge, one of the most southern spurs of the Wind River Mountains, they encamped, after a march of seven hours and a half, on the banks of a small clear stream, running to the south, in which they caught a number of fine trout.
Moreover you have a great river hard by if he can be of any use to you, but there is no fighting against Jove the son of Saturn, with whom not even King Achelous can compare, nor the mighty stream of deep-flowing Oceanus, from whom all rivers and seas with all springs and deep wells proceed; even Oceanus fears the lightnings of great Jove, and his thunder that comes crashing out of heaven.
There they will see the happy hunting-grounds, with the souls of the brave and good living in tents in green meadows, by bright running streams, or hunting the herds of buffalo, and elk, and deer, which have been slain on earth.
The logs swung around in circles, and we got nowhere, and all the time the forest was flashing past as we drifted down the stream.
More leaping tree squirrels, more ruddy madronos and majestic oaks, more fairy circles of redwoods, and, still beside the singing stream, they passed a gate by the roadside.
He rested again until the sun was well up and gilding the great river with its splendor, and then he plunged into the stream.
The stream was still there, and singing the same sweet old song.
Now mine own affairs, which are of a spiritual kind and much more important than yours which are carnal, lie on the other side of this stream.
But the most annoying hindrance we encountered was from a multitude of crooked boughs, which, shooting out almost horizontally from the sides of the chasm, twisted themselves together in fantastic masses almost to the surface of the stream, affording us no passage except under the low arches which they formed.
He looked a moment at his "unsteadfast footing," then let his gaze wander to the swirling water of the stream racing madly beneath his feet.
A half-hour of rapid travelling across the swampy neck of land and over the rising promontory brought Tarzan, by a short cut, to the inward bend of the winding river, and there before him upon the bosom of the stream he saw the dugout, and in its stern Nikolas Rokoff.
Shortly after we resumed our course upstream, we saw the mouth of another and smaller river emptying into the main channel from the south--that is, upon our right; and almost immediately after we came upon a large island five or six miles in length; and at fifty miles there was a still larger river than the last coming in from the northwest, the course of the main stream having now changed to northeast by southwest.

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