Xsun

Last updated
Xsun
Developer(s) Sun Microsystems
Initial releaseNovember 1993;25 years ago (1993-11)
Operating system Solaris
Type X Window System

Xsun is an X Window System (X11) display server implementation included with Solaris, developed by Sun Microsystems. It replaced the older Xnews server, which supported the display of not only X11 applications, but also NeWS and SunView programs. Xsun discontinued support for these legacy environments, and added support for Display PostScript.

X Window System windowing system for bitmap displays on UNIX-like systems

The X Window System is a windowing system for bitmap displays, common on Unix-like operating systems.

Display server program to coordinate the input and output of display clients

A display server or window server is a program whose primary task is to coordinate the input and output of its clients to and from the rest of the operating system, the hardware, and each other. The display server communicates with its clients over the display server protocol, a communications protocol, which can be network-transparent or simply network-capable.

Solaris (operating system) Unix operating system originally developed by Sun Microsystems

Solaris is a Unix operating system originally developed by Sun Microsystems. It superseded their earlier SunOS in 1993. In 2010, after the Sun acquisition by Oracle, it was renamed Oracle Solaris.

Contents

Xsun was first released as part of Solaris 2.3 in November 1993. It was originally based on X11R5; the version included with Solaris 10 is based on X11R6.6.

Solaris 10 includes both Xsun and the X.Org Server, Xorg, the open-source software reference implementation of X, based on X11R7. The Xorg server was the most commonly used display server on x86 systems, while the Xsun server remained the most commonly used on SPARC systems; Xorg support for SPARC was only added in Solaris 10 8/07, and had very limited driver support. [1] The OpenSolaris project stated that the future direction of X support is the X.Org implementation. [2] Oracle Solaris 11, released in November, 2011, includes only the Xorg server (X.Org 1.10.3). [3]

X.Org Server is the free and open-source implementation of the display server for the X Window System stewarded by the X.Org Foundation.

Open-source software software licensed to ensure source code usage rights

Open-source software (OSS) is a type of computer software in which source code is released under a license in which the copyright holder grants users the rights to study, change, and distribute the software to anyone and for any purpose. Open-source software may be developed in a collaborative public manner. Open-source software is a prominent example of open collaboration.

In the software development process, a reference implementation is the standard from which all other implementations and corresponding customizations are derived. An improvement to a reference implementation reflects an unchanging specification. Conversely, a failed attempt at an implementation may prove that the specification is not suitable and needs improvement itself. Testing the implementation-vs.-specification relationship further enhances the production's inter-process efficiencies:

A reference implementation is, in general, an implementation of a specification to be used as a definitive interpretation for that specification. During the development of the ... conformance test suite, at least one relatively trusted implementation of each interface is necessary to (1) discover errors or ambiguities in the specification, and (2) validate the correct functioning of the test suite.

Characteristics of a Reference Implementation:

  1. Developed concurrently with the specification and test suite;
  2. Verifies that specification is implementable;
  3. Enables the test suite to be tested;
  4. Serves as a Gold Standard against which other implementations can be measured;
  5. Helps to clarify the intent of the specification in situations where conformance tests are inadequate

Design

In contrast to XFree86, Xsun implemented kernel-based mode setting for some graphics device drivers.

XFree86 implementation of the X Window System

XFree86 is an implementation of the X Window System. It was originally written for Unix-like operating systems on IBM PC compatibles and was available for many other operating systems and platforms. It is free and open source software under the XFree86 License version 1.1. It was developed by the XFree86 Project, Inc. The lead developer was David Dawes. The last released version was 4.8.0, released December 2008. The last XFree86 CVS commit was made on May 18, 2009; the project was confirmed dormant in December 2011.

Mode setting

Mode setting is a software operation that activates a display mode for a computer's display controller.

In computing, a device driver is a computer program that operates or controls a particular type of device that is attached to a computer. A driver provides a software interface to hardware devices, enabling operating systems and other computer programs to access hardware functions without needing to know precise details about the hardware being used.

See also

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References

  1. "Chapter 5 What's New in the Solaris 10 8/07 Release". Solaris 10 What's New. Oracle Corporation. 2010. Retrieved 2018-01-31.
  2. "OpenSolaris Community: X Window System". 2009-08-11. Archived from the original on 2009-09-29. Retrieved 2018-01-31. We've been working to migrate all of the existing libraries and clients to build from this source base as well for future Solaris releases, and have almost finished that now.
  3. "Xorg Family of Servers". Chapter 12: Transitioning From Oracle Solaris 10 to Oracle Solaris 11. 2012. Retrieved 2018-01-31. While Oracle Solaris 10 includes both the Xsun family of X servers, with Xsun as the default on SPARC platforms, and Xorg as the default on x86 platforms, Oracle Solaris 11 only supports the Xorg family of servers.