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UNIX System V
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=== SVR4 === <!-- This section is linked from [[SVR4]] --> [[File:HP-HP9000-C110-Workstation 10.jpg|thumb|[[HP 9000]] C110 running [[HP-UX]] in console mode]] [[File:Openwindows.jpg|thumb|[[OpenWindows]], an early [[desktop environment]] for SVR4]] [[File:HP-HP9000-735-99-Workstation 02.jpg|thumb|[[HP 9000]] 735 running [[HP-UX]] with the [[Common Desktop Environment]] (CDE)]] [[File:Unix SVR4.2 mousepad.jpg|thumb|'Catch the wave' promotional mousepad for SVR4.2]] [[File:Sun Ultra 20 Workstation (2005).jpeg|thumb|[[Sun Ultra series|Sun Ultra 20]] with [[Solaris (operating system)|Solaris]] 10]] System V Release 4.0 was announced on October 18, 1988<ref>{{cite press release |title= SEVERAL MAJOR COMPUTER AND SOFTWARE COMPANIES ANNOUNCE STRATEGIC COMMITMENT TO AT&T'S UNIX SYSTEM V, RELEASE 4.0 |publisher= Amdahl, Control Data Corporation, et al. |date= October 18, 1988 |url= http://groups.google.com/group/comp.unix.questions/msg/2e02a599c5c62848 |access-date= 2007-01-01 }}</ref> and was incorporated into a variety of commercial Unix products from early 1989 onwards.<ref name="levenez"/> A joint project of AT&T Unix System Laboratories and [[Sun Microsystems]],<ref name="patton19880118">{{Cite magazine |last=Patton |first=Carole |date=18 January 1988 |title=Sun and AT&T Plan to Engineer Next-Generation Unix System |url=https://books.google.com/books?id=Dz8EAAAAMBAJ&pg=PA11#v=onepage&q&f=false |access-date=2025-05-25 |magazine=[[InfoWorld]] |page=11 |volume=10 |issue=3}}</ref> it combined technology from: * SVR3 * [[Berkeley Software Distribution|4.3BSD]] * [[Xenix]] * [[SunOS]] New features included: * From BSD: ** [[TCP/IP]] support ** Sockets ** [[Unix File System|UFS]] ** Support for multiple groups ** [[C shell]] * From SunOS: ** [[Virtual file system]] interface (replacing File System Switch in System V Release 3) ** [[Network File System (protocol)|NFS]] ** New virtual memory system including support for [[mmap|memory mapped]] files ** Improved shared library system based on the SunOS 4.x model<ref name="Levine_1999_CH10"/> ** [[OpenWindows]] [[GUI]] environment ** [[External Data Representation]] (XDR) and [[ONC RPC]] * From Xenix: ** x86 [[device driver]]s ** Binary compatibility with Xenix (in the x86 version of System V) * [[KornShell]] * [[C (programming language)#ANSI C and ISO C|ANSI X3J11 C]] compatibility * Multi-National Language Support (MNLS) * Better [[internationalization and localization|internationalization]] support * An [[application binary interface]] (ABI) based on [[Executable and Linkable Format]] (ELF) * Support for standards such as [[POSIX]] and [[X/Open]] Many companies licensed SVR4 and bundled it with computer systems such as [[workstation]]s and [[network server]]s. SVR4 systems vendors included [[Atari Corporation|Atari]] ([[Atari System V]]), [[Commodore International|Commodore]] ([[Amiga Unix]]), [[Data General]] ([[DG/UX]]), [[Fujitsu]] ([[UXP/DS]]), [[Hitachi]] (HI-UX), Hewlett-Packard (HP-UX), [[NCR Corporation|NCR]] ([[Unix/NS]]), [[NEC]] ([[EWS-UX]], UP-UX, UX/4800, [[SUPER-UX]]), [[Oki Electric Industry|OKI]] (OKI System V), [[Pyramid Technology]] ([[DC/OSx]]), [[Silicon Graphics|SGI]] ([[IRIX]]), [[Siemens]] ([[SINIX]]), [[Sony]] ([[Sony NEWS|NEWS-OS]]), [[Sumitomo Electric Industries]] (SEIUX), and [[Sun Microsystems]] ([[Solaris (operating system)|Solaris]]) with [[illumos]] in the 2010s as the only [[open-source software|open-source]] platform. Software porting houses also sold enhanced and supported [[x86 architecture|Intel x86]] versions. SVR4 software vendors included [[Dell]] (Dell UNIX),<ref>{{Citation |title=Technologists notes β A brief history of Dell UNIX |url=http://technologists.com/notes/2008/01/10/a-brief-history-of-dell-unix/ |date=10 January 2008 |access-date=2009-02-18 }}</ref> [[Everex]] (ESIX), Micro Station Technology (SVR4), [[Microport Systems|Microport]] (SVR4), and UHC (SVR4).<ref>[[Eric S. Raymond]], [http://www.catb.org/~esr/faqs/clone-unix-guide.txt A buyer's guide to UNIX versions for PC-clone hardware], posted to [[Usenet]] November 16, 1994.</ref> The primary platforms for SVR4 were Intel x86 and [[SPARC]]; the SPARC version, called Solaris 2 (or, internally, [[SunOS]] 5.x), was developed by Sun. The relationship between Sun and AT&T was terminated after the release of SVR4, meaning that later versions of Solaris did not inherit features of later SVR4.x releases. Sun would in 2005 release most of the source code for Solaris 10 (SunOS 5.10) as the [[open-source software|open-source]] [[OpenSolaris]] project, creating, with its forks, the only open-source (albeit heavily modified) System V implementation available. After [[Oracle Corporation|Oracle]] took over Sun, Solaris was [[Fork (software development)|fork]]ed into proprietary release, but [[illumos]] as the continuation project is being developed in open-source. A consortium of Intel-based resellers including [[Unisys]], [[International Computers Limited|ICL]], [[NCR Corporation]], and [[Olivetti]] developed SVR4.0MP with [[multiprocessing]] capability (allowing system calls to be processed from any processor, but interrupt servicing only from a "master" processor).<ref> {{Citation |title=Unix Internatl. and USL release early version of SVR4 multiprocessing software |url=http://www.allbusiness.com/technology/computer-software/165194-1.html |date=17 June 1991 |archive-url=https://web.archive.org/web/20100111232743/https://www.allbusiness.com/technology/computer-software/165194-1.html |archive-date=2010-01-11 |access-date=2009-04-22 }} </ref> Release 4.1 ES (Enhanced Security) added security features required for [[Trusted Computer System Evaluation Criteria|Orange Book]] B2 compliance and [[Access Control List]]s and support for dynamic loading of kernel modules.<ref>{{cite journal |title=Unix International reviews the Unix System V.4 story so far |author=William Fellows |date=13 August 1992 |journal=Computer Business Review |url=http://www.cbronline.com/news/unix_international_reviews_the_unix_system_v4_story_so_far |access-date=2008-10-31 |archive-url=https://web.archive.org/web/20090221065610/http://www.cbronline.com/news/unix_international_reviews_the_unix_system_v4_story_so_far |archive-date=2009-02-21}}</ref><ref> {{Citation |title=Computer Security |first=Matt |last=Bishop |publisher=Addison Wesley |date=December 2, 2002 |isbn=0-201-44099-7 |page=505 }} </ref>
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