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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. : Portable Operating System Interface, a set of IEEE standards designed to provide application portability between UNIX variants.


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  • The Unix epoch (also known as Unix Time Stamp) is the representation of time as the number of non-leap seconds since 00: 00: 00 UTC on January 1, 1970, introduced by the Unix operating system, standardised in POSIX, and later adopted by the Java programming language and JavaScript.

    2004 August

  • For those who don't know, Unix time is also known as POSIX time and is defined as the number of seconds that have elapsed since midnight on January 1, 1970, not including added leap seconds.

    Planet Ubuntu

  • But keep in mind that calling the POSIX function exit (3) still terminates the complete process and not just the current thread.

    Netvouz - new bookmarks

  • Or it might be based around compiling source, in which case the platform identifier might just be "POSIX", and the implementation image will be a tarball full of C source, which is compiled with the local C compiler and the result then installed.

    Snell-Pym » HYDROGEN: Bootstrapping

  • When the VMS operating system was ported to the Alpha platform, it was renamed OpenVMS, for both VAX and Alpha, in part to signify the high degree of support for industry standards such as POSIX, which provides many features of UNIX systems.

    FAQ: The DEC VMS Faq from Steve Lionel

  • Moreover, OpenVMS will provide interoperability with UNIX systems through industry standards such as POSIX, XPG, DCE, and CORBA.

    FAQ: The DEC VMS Faq from Steve Lionel

  • We show how to obtain algorithms for various matching policies such as POSIX and greedy left-to-right.

    Planet Haskell

  • IBM states that the / QOpenSys file system is compatible with UNIX-based operating system standards such as POSIX and XPG, and that it supports multiple hard links and symbolic links.

    Breaking News

  • One the one hand, implementing a standard such as POSIX gives a new operating system a leg up and a library of working or partially working software, always a boon to an OS looking to build a userbase.


  • The POSIX-compliant BlackBerry Tablet OS is built on the QNX Neutrino microkernel architecture, which has been leveraged previously in systems such as planes, trains, cars and medical equipment.

    With PlayBook, RIM jumps into tablet game


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  • Where the POSIX name came from

    The origin of the name POSIX.

    In the 1980s I was in the IEEE committee that wrote the standard that ultimately became known as POSIX. The committee set itself the task of standardizing interface specs for a Unix-like system, but had no short name for its work. When the first part of the specification was ready, someone gave it the name "IEEEIX", with a subtitle that included "Portable Operating System" — perhaps "Specifications for a Portable Operating System".

    It seemed to me that nobody would ever say "IEEEIX", since the pronunciation would sound like a shriek of terror; rather, everyone would call it "Unix". That would have boosted AT&T, the GNU Project's rival, an outcome I did not want. So I looked for another name, but nothing natural suggested itself to me.

    So I put the initials of "Portable Operating System" together with the same suffix "ix", and came up with "POSIX". It sounded good and I saw no reason not to use it, so I suggested it. Although it was just barely in time, the committee adopted it.
    I think the administrators of the committee were as relieved as I was to give the standard a pronounceable name.

    Copyright (c) 2011 Richard Stallman Verbatim copying and redistribution of this entire page are permitted provided this notice is preserved.

    March 28, 2015