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What Are the Problems with Embedded Linux?
What Are the Problems with Embedded Linux? Every Operating System Has Benefits and Drawbacks Linux is ubiquitous. It runs most internet servers, is inside Android* smartphones, and is used on millions of embedded systems that, in the past, ran Real-Time Operating Systems (RTOSes). Linux can (and should) be used were possible for embedded projects, but while it gives you extreme choice, it also presents the risk of extreme complexity. What, then, are the trade-offs between embedded Linux and an RTOS? In this article, we cover some key considerations when evaluating Linux for a new development: ■ Design your system architecture first ■ What is Linux? ■ Linux vs. RTOSes ■ Free software is about liberty—not price ■ How much does Embedded Linux cost? ■ Why pay for Embedded Linux? ■ Should you buy Embedded Linux or roll-your-own (RYO)? ■ To fork or not to fork? ■ Software patching ■ Open source licensing ■ Making an informed decision The important thing is not whether Linux or an RTOS is “the best,” but whether either operating system—or both together—makes the most technical and financial sense for your project. We hope this article helps you make an informed decision. Design Your System Architecture First It is important to design your system architecture first—before choosing either Linux or an RTOS—because both choices can limit architectural freedom. You may discover that aspects of your design require neither Linux nor an RTOS, making your design a strong candidate for a heterogeneous approach that includes one or more bare-metal environments (with possibly a Linux and/or RTOS environment as well). -
Projects on the Move
:FDDLE@KP Free Software Projects 8elg$kf$[Xk\fm\im`\nf]]i\\jf]knXi\Xe[`kjdXb\ij GIFA<:KJFEK?<DFM< Finally there’s a free alternative to the proprietary Flash on the web. Unfortunately, it implements Microsoft technology whose software patents might render the free Moonlight license useless. BY CARSTEN SCHNOBER Microsoft and Novell formed an alliance Flash format as a global standard for problems to newcomers because you can with the aim of establishing a Flash al- complex, interactive web content. The download a prebuilt version of the pl- ternative for Linux. After one year of co- proprietary browser plugin by Adobe is ugin from the project website and click operation between developers from both like a red flag to a bull for many Linux to install (Figure 1). Thus far, Moonlight companies, a beta version of the Silve- users. Because the source code is not supports only Linux systems using Fire- light free implementation, Moonlight, is available, developers and users of the fox, although the makers claim that it now available. Many members of the free operating system have been forced will support OpenSolaris and the Kon- Linux community suspect that the to rely on Adobe providing updates. In queror and Opera browsers in the near Moonlight Linux implementation [1] is the past, Adobe has been reticent with future. being used to establish Microsoft's Sil- respect to timeliness and completeness. For licensing reasons, the binary pack- verlight [2] technology on a cross-plat- age leaves out all multimedia codecs, form basis, thereby infiltrating the soft- ;Xe^\ijXe[9\e\]`kj thus seriously limiting its own function- ware freedom fighters’ fortress. -
Mono for Cross-Platform Control System Environment
monomono forfor crosscross--platformplatform controlcontrol systemsystem environmentenvironment H.H. NishimuraNishimura andand C.C. TimossiTimossi,, LBNL,LBNL, Berkeley,Berkeley, CACA 94720,94720, U.S.AU.S.A Work supported by the U.S. Department of Energy under Contract No. DE-AC03-76SF00098 .NET.NET FrameworkFramework z MicrosoftMicrosoft ÄÄ ECMA/ISOECMA/ISO z 1.01.0 inin 20022002 z 1.11.1 inin 20032003 z 2.02.0 inin 20052005 z 3.03.0 inin 2006?2006? z WindowsWindows VistaVista isis .NET.NET--based.based. z C#C# andand manymany otherother languages.languages. .NET.NET missesmisses 22 pieces..pieces.. WhatWhat isis Mono?Mono? z AnAn independentindependent implementationimplementation ofof .NET.NET FrameworkFramework byby XimiaXimiann ÄÄNovell.Novell. z Linux,Linux, FreeBSD,FreeBSD, UNIX,UNIX, MacMac OSOS X,X, SolarisSolaris andand WindowsWindows z s390/s390x,s390/s390x, SPARC,SPARC, PowerPC,PowerPC, x86,x86, x86x86--64,64, IA64,IA64, ARMARM z DualDual LicensedLicensed byby NovellNovell HPHP atat www.mono-project.com SearchSearch MonoMono atat www.wikipedia.orgwww.wikipedia.org WhoWho mademade Mono?Mono? z MiguelMiguel dede IcazaIcaza z CreatedCreated GnomeGnome withwith FedericoFederico MenaMena inin 1997.1997. z CreatedCreated MonoMono inin 20012001 atat XimianXimian.. z ““MonoMono andand GNOME.GNOME. TheThe longlong replyreply”” z 0606 FebFeb 20022002 z http://mail.gnome.org/archives/gnomehttp://mail.gnome.org/archives/gnome-- hackers/2002hackers/2002--February/msg00031.htmlFebruary/msg00031.html z NowNow underunder Novell.Novell. IsIs MonoMono aa CrossCross--PlatformPlatform .NET?.NET? z DefinitelyDefinitely YES!YES! z AsAs .NET.NET RuntimeRuntime EnvironmentEnvironment z AsAs .NET.NET DevelopmentDevelopment EnvironmentEnvironment z AA fewfew yearsyears behindbehind thethe ““.NET.NET onon WindowsWindows””.. z NonNon--graphicalgraphical classesclasses areare basicallybasically OK.OK. -
Schon Mal Dran Gedacht,Linux Auszuprobieren? Von G. Schmidt
Schon mal dran gedacht, Linux auszuprobieren? Eine Einführung in das Betriebssystem Linux und seine Distributionen von Günther Schmidt-Falck Das Magazin AUSWEGE wird nun schon seit 2010 mit Hilfe des Computer-Betriebs- system Linux erstellt: Texte layouten, Grafiken und Fotos bearbeiten, Webseiten ge- stalten, Audio schneiden - alles mit freier, unabhängiger Software einer weltweiten Entwicklergemeinde. Aufgrund der guten eigenen Erfahrungen möchte der folgende Aufsatz ins Betriebssystem Linux einführen - mit einem Schwerpunkt auf der Distri- bution LinuxMint. Was ist Linux? „... ein hochstabiles, besonders schnelles und vor allem funktionsfähiges Betriebssystem, das dem Unix-System ähnelt, … . Eine Gemeinschaft Tausender programmierte es und verteilt es nun unter der GNU General Public Li- cense. Somit ist es frei zugänglich für jeden und kos- tenlos! Mehrere Millionen Leute, viele Organisatio- nen und besonders Firmen nutzen es weltweit. Die meisten nutzen es aus folgenden Gründen: • besonders schnell, stabil und leistungs- stark • gratis Support aus vielen Internet- Newsgruppen Tux, der Pinguin, ist das Linux-Maskottchen • übersichtliche Mailing-Listen • massenweise www-Seiten • direkter Mailkontakt mit dem Programmierer sind möglich • Bildung von Gruppen • kommerzieller Support“1 Linux ist heute weit verbreitet im Serverbereich: „Im Oktober 2012 wurden mindes- tens 32% aller Webseiten auf einem Linux-Server gehostet. Da nicht alle Linux-Ser- ver sich auch als solche zu erkennen geben, könnte der tatsächliche Anteil um bis zu 24% höher liegen. Damit wäre ein tatsächlicher Marktanteil von bis zu 55% nicht 1 http://www.linuxnetworx.com/linux-richtig-nutzen magazin-auswege.de – 2.11.2015 Schon mal dran gedacht, Linux auszuprobieren? 1 auszuschliessen. (…) Linux gilt innerhalb von Netzwerken als ausgesprochen sicher und an die jeweiligen Gegebenheiten anpassbar. -
OS Linux Desktop Effects
OS Linux Desktop Effects Tomáš Dlouhý Y04A1L Presentation Content • Basics • Composite Managers • Compiz Fusion • Basic Effects • Advanced Effects • Small scratch Y04A1L Presentation Basics I • Linux Kernel • X Server • Window Manager • Composite Manager Y04A1L Presentation Basics II • How does compositing works? Y04A1L Presentation Composite Managers I • Compiz • Compiz Quinnstorm known as Beryl • Kwin from KDE4 platform • Compiz Fusion (in next chapter) Y04A1L Presentation Composite Managers II • Compiz – Released by Novell in january 2006 – Include effects as Cube, rain, wobbly... – Supports newest NVIDIA / ATI cards only – Most stable – Supports KDE and GNOME Y04A1L Presentation Composite Managers III • Beryl – Fork of compiz – Extended effects from Compiz – Adding: Show, Animations, Emerald (window borders),... – Works with all graphics cards which supports 3d acceleration (requires driver with support 3d) – Supports KDE and GNOME Y04A1L Presentation Composite Managers IV • Kwin 4 – Relativly newest, many effects still under development – Few effects as: mouse position highlight, show all desktop, animations,... – Many effects dont require 3d acceleration (using X Server DRI) Y04A1L Presentation Compiz Fusion • After reunion Compiz and Beryl (renamed to Compiz Extras) • First release in summer 2007 • Adding all advatages from both projects • Come with more effects as Expo, Paint,... • CompizConfig Settings Manager Y04A1L Presentation Basic effects I • Cube – Most popular effect – Can have more then 4 desktops – Change background -
GNU Guix Cookbook Tutorials and Examples for Using the GNU Guix Functional Package Manager
GNU Guix Cookbook Tutorials and examples for using the GNU Guix Functional Package Manager The GNU Guix Developers Copyright c 2019 Ricardo Wurmus Copyright c 2019 Efraim Flashner Copyright c 2019 Pierre Neidhardt Copyright c 2020 Oleg Pykhalov Copyright c 2020 Matthew Brooks Copyright c 2020 Marcin Karpezo Copyright c 2020 Brice Waegeneire Copyright c 2020 Andr´eBatista Copyright c 2020 Christine Lemmer-Webber Copyright c 2021 Joshua Branson Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled \GNU Free Documentation License". i Table of Contents GNU Guix Cookbook ::::::::::::::::::::::::::::::: 1 1 Scheme tutorials ::::::::::::::::::::::::::::::::: 2 1.1 A Scheme Crash Course :::::::::::::::::::::::::::::::::::::::: 2 2 Packaging :::::::::::::::::::::::::::::::::::::::: 5 2.1 Packaging Tutorial:::::::::::::::::::::::::::::::::::::::::::::: 5 2.1.1 A \Hello World" package :::::::::::::::::::::::::::::::::: 5 2.1.2 Setup:::::::::::::::::::::::::::::::::::::::::::::::::::::: 8 2.1.2.1 Local file ::::::::::::::::::::::::::::::::::::::::::::: 8 2.1.2.2 `GUIX_PACKAGE_PATH' ::::::::::::::::::::::::::::::::: 9 2.1.2.3 Guix channels ::::::::::::::::::::::::::::::::::::::: 10 2.1.2.4 Direct checkout hacking:::::::::::::::::::::::::::::: 10 2.1.3 Extended example :::::::::::::::::::::::::::::::::::::::: -
How-To Gnome-Look Guide
HHOOWW--TTOO Written by David D Lowe GGNNOOMMEE--LLOOOOKK GGUUIIDDEE hen I first joined the harddisk, say, ~/Pictures/Wallpapers. right-clicking on your desktop Ubuntu community, I and selecting the appropriate You may have noticed that gnome- button (you know which one!). Wwas extremely look.org separates wallpapers into impressed with the amount of different categories, according to the customization Ubuntu had to size of the wallpaper in pixels. For Don't let acronyms intimidate offer. People posted impressive the best quality, you want this to you; you don't have to know screenshots, and mentioned the match your screen resolution. If you what the letters stand for to themes they were using. They don't know what your screen know what it is. Basically, GTK is soon led me to gnome-look.org, resolution is, click System > the system GNOME uses to the number one place for GNOME Preferences > Screen Resolution. display things like buttons and visual customization. The However, Ubuntu stretches controls. GNOME is Ubuntu's screenshots there looked just as wallpapers quite nicely if you picked default desktop environment. I impressive, but I was very the wrong size, so you needn't fret will only be dealing with GNOME confused as to what the headings about it. on the sidebar meant, and I had customization here--sorry no idea how to use the files I SVG is a special image format that Kubuntu and Xubuntu folks! downloaded. Hopefully, this guide doesn't use pixels; it uses shapes Gnome-look.org distinguishes will help you learn what I found called vectors, which means you can between two versions of GTK: out the slow way. -
The Glib/GTK+ Development Platform
The GLib/GTK+ Development Platform A Getting Started Guide Version 0.8 Sébastien Wilmet March 29, 2019 Contents 1 Introduction 3 1.1 License . 3 1.2 Financial Support . 3 1.3 Todo List for this Book and a Quick 2019 Update . 4 1.4 What is GLib and GTK+? . 4 1.5 The GNOME Desktop . 5 1.6 Prerequisites . 6 1.7 Why and When Using the C Language? . 7 1.7.1 Separate the Backend from the Frontend . 7 1.7.2 Other Aspects to Keep in Mind . 8 1.8 Learning Path . 9 1.9 The Development Environment . 10 1.10 Acknowledgments . 10 I GLib, the Core Library 11 2 GLib, the Core Library 12 2.1 Basics . 13 2.1.1 Type Definitions . 13 2.1.2 Frequently Used Macros . 13 2.1.3 Debugging Macros . 14 2.1.4 Memory . 16 2.1.5 String Handling . 18 2.2 Data Structures . 20 2.2.1 Lists . 20 2.2.2 Trees . 24 2.2.3 Hash Tables . 29 2.3 The Main Event Loop . 31 2.4 Other Features . 33 II Object-Oriented Programming in C 35 3 Semi-Object-Oriented Programming in C 37 3.1 Header Example . 37 3.1.1 Project Namespace . 37 3.1.2 Class Namespace . 39 3.1.3 Lowercase, Uppercase or CamelCase? . 39 3.1.4 Include Guard . 39 3.1.5 C++ Support . 39 1 3.1.6 #include . 39 3.1.7 Type Definition . 40 3.1.8 Object Constructor . 40 3.1.9 Object Destructor . -
Openprinting Plenary
OpenPrinting Plenary Till Kamppeter, OpenPrinting IPP Everywhere under Linux – Driverless Printing · Support completely implemented: cups-filters: gstoraster/pdftoraster turns PDF into PWG Raster to send to IPP Everywhere printer, rastertopdf accepts PWG Raster as input for CUPS queue to emulate IPP Everywhere printer cups-browsed: If activated IPP Everywhere printers are discovered and a queue auto-generated, even with PPD file (PPD generator taken from CUPS 2.1.x, experimental) Ghostscript: PWG Raster format can be generated via “pwgraster” device or via “cups” device and MediaClass “PwgRaster” Printing stack of Level 2 is enough · Ubuntu Vivid (15.04) contains all this and therefore should fully support IPP Everywhere · Backport to Ubuntu Trusty (14.04 LTS) planned, but we need testing by manufacturers first · NEEDED: Testing all this by printer manufacturers, so please take Ubuntu 15.04 and test with your printers 2 Mobile Printing · Printing stack ready for mobile: cupsd and cups-browsed can be run on-demand, with systemd (most modern distros, incl. Ubuntu 15.04) or Upstart (Ubuntu Phone) Packaging of printing stack in three levels, level 2 for mobile, level 3 for desktop, server can be level 2 (appliance) or level 3 (computer) Printing stack is same software for mobile and desktop, so convergence (connect mobile phone to monitor to get desktop) is easy · MISSING: Mobile print dialog, but will be implemented soon for Ubuntu Mobile · Nice to have: Lightweight renderer like MuPDF 3 cups-filters · Most important changes: Create -
Clutter Version 1.10.0, Updated 9 May 2012
Guile-GNOME: Clutter version 1.10.0, updated 9 May 2012 Matthew Allum and OpenedHand LTD Intel Corporation This manual is for (gnome clutter) (version 1.10.0, updated 9 May 2012) Copyright 2006,2007,2008 OpenedHand LTD Copyright 2009,2010,2011,2012 Intel Corporation Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. You may obtain a copy of the GNU Free Documentation License from the Free Software Foundation by visiting their Web site or by writing to: The Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA i Short Contents 1 Overview :::::::::::::::::::::::::::::::::::::::::::: 1 2 ClutterAction :::::::::::::::::::::::::::::::::::::::: 2 3 ClutterActorMeta ::::::::::::::::::::::::::::::::::::: 3 4 ClutterActor ::::::::::::::::::::::::::::::::::::::::: 5 5 ClutterAlignConstraint:::::::::::::::::::::::::::::::: 63 6 ClutterAlpha :::::::::::::::::::::::::::::::::::::::: 65 7 ClutterAnimatable ::::::::::::::::::::::::::::::::::: 68 8 Implicit Animations :::::::::::::::::::::::::::::::::: 69 9 ClutterAnimator ::::::::::::::::::::::::::::::::::::: 76 10 ClutterBackend :::::::::::::::::::::::::::::::::::::: 82 11 ClutterBinLayout :::::::::::::::::::::::::::::::::::: 84 12 ClutterBindConstraint :::::::::::::::::::::::::::::::: 87 13 Key Bindings:::::::::::::::::::::::::::::::::::::::: 90 -
SPARTAN ILY Fee Hikes May Stop KEEPING FIT and EDUCATED
VOLUME 108, NO. 88 TUESDAY MAY 6. 1 9 9 7 INSIDE * INSIDE a IS ell Spirit of friendship goes 4,#..sk The Offspring gives its.. w leehi beyond competition dose of alternative rock(---' Page 5 1" -V-- Page 8 Ma Ser San Jose State University Since 1 93 .1 SPARTAN ILY Fee hikes may stop KEEPING FIT AND EDUCATED By Dennis Knight said Ducheny, the chair of the Spartan Daily Stuff Write, Assembly Budget Committee, in a press release. "Not only would AB 01 pay Students who are tired 1318 hold the line on fee hikes for at California ing exorbitant fees die rest of the decade, but it would soon find relief if universities may give working families the opportu- Act of the College Affordability nity to plan and save for their chil- the 1997 makes its way through dren's education." State Assembly. Besides freezing fees until the Written by Assemblywoman turn of the century, AB 1318 (D - Denise Moreno Ducheny would limit student fee increases Vista), the bill, known as Chula after the year 2000 to no more AB 1318. would freeze student fees than the rise in personal income University, in the t ..difornia State from the prior year. The bill would California and University of also express the intent of the legis- College California Community lature to financially support public the year 2000. systems until colleges based on growth in enroll- continues in the spirit "This act ment and personal income, accord- 1960 in mak- of the Master Plan of ing to Ducheny. as essible ing our public colleges Currently, the cost for students by laying out a rational and pre- dictable policy for student lees," See Fees, page 5 It's standing room only in the Washington Square Hall let, ture room as author Anne Lamott speaks to SJSU students Friday afternoon. -
Toward General Purpose 3D User Interfaces: Extending Windowing Systems to Three Dimensions
TOWARD GENERAL PURPOSE 3D USER INTERFACES: EXTENDING WINDOWING SYSTEMS TO THREE DIMENSIONS A Thesis presented to the Faculty of California Polytechnic State University San Luis Obispo In Partial Fulfillment of the Requirements for the Degree Master of Science in Computer Science by Forrest Reiling June 2014 c 2014 Forrest Reiling ALL RIGHTS RESERVED ii COMMITTEE MEMBERSHIP TITLE: Toward General Purpose 3D User Inter- faces: Extending Windowing Systems to Three Dimensions AUTHOR: Forrest Reiling DATE SUBMITTED: June 2014 COMMITTEE CHAIR: Assistant Professor Zo¨eWood, Ph.D., Department of Computer Science COMMITTEE MEMBER: Assistant Professor Chris Lupo, Ph.D., Department of Computer Science COMMITTEE MEMBER: Professor Franz Kurfess, Ph.D., Department of Computer Science iii ABSTRACT Toward General Purpose 3D User Interfaces: Extending Windowing Systems to Three Dimensions Forrest Reiling Recent growth in the commercial availability of consumer grade 3D user interface de- vices like the Microsoft Kinect and the Oculus Rift, coupled with the broad availability of high performance 3D graphics hardware, has put high quality 3D user interfaces firmly within the reach of consumer markets for the first time ever. However, these devices require custom integration with every application which wishes to use them, seriously limiting application support, and there is no established mechanism for mul- tiple applications to use the same 3D interface hardware simultaneously. This thesis proposes that these problems can be solved in the same way that the same problems were solved for 2D interfaces: by abstracting the input hardware behind input prim- itives provided by the windowing system and compositing the output of applications within the windowing system before displaying it.