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  • Parent Objects

    - by Ali Bahrami
    Support for Parent Objects was added in Solaris 11 Update 1. The following material is adapted from the PSARC arc case, and the Solaris Linker and Libraries Manual. A "plugin" is a shared object, usually loaded via dlopen(), that is used by a program in order to allow the end user to add functionality to the program. Examples of plugins include those used by web browsers (flash, acrobat, etc), as well as mdb and elfedit modules. The object that loads the plugin at runtime is called the "parent object". Unlike most object dependencies, the parent is not identified by name, but by its status as the object doing the load. Historically, building a good plugin is has been more complicated than it should be: A parent and its plugin usually share a 2-way dependency: The plugin provides one or more routines for the parent to call, and the parent supplies support routines for use by the plugin for things like memory allocation and error reporting. It is a best practice to build all objects, including plugins, with the -z defs option, in order to ensure that the object specifies all of its dependencies, and is self contained. However: The parent is usually an executable, which cannot be linked to via the usual library mechanisms provided by the link editor. Even if the parent is a shared object, which could be a normal library dependency to the plugin, it may be desirable to build plugins that can be used by more than one parent, in which case embedding a dependency NEEDED entry for one of the parents is undesirable. The usual way to build a high quality plugin with -z defs uses a special mapfile provided by the parent. This mapfile defines the parent routines, specifying the PARENT attribute (see example below). This works, but is inconvenient, and error prone. The symbol table in the parent already describes what it makes available to plugins — ideally the plugin would obtain that information directly rather than from a separate mapfile. The new -z parent option to ld allows a plugin to link to the parent and access the parent symbol table. This differs from a typical dependency: No NEEDED record is created. The relationship is recorded as a logical connection to the parent, rather than as an explicit object name However, it operates in the same manner as any other dependency in terms of making symbols available to the plugin. When the -z parent option is used, the link-editor records the basename of the parent object in the dynamic section, using the new tag DT_SUNW_PARENT. This is an informational tag, which is not used by the runtime linker to locate the parent, but which is available for diagnostic purposes. The ld(1) manpage documentation for the -z parent option is: -z parent=object Specifies a "parent object", which can be an executable or shared object, against which to link the output object. This option is typically used when creating "plugin" shared objects intended to be loaded by an executable at runtime via the dlopen() function. The symbol table from the parent object is used to satisfy references from the plugin object. The use of the -z parent option makes symbols from the object calling dlopen() available to the plugin. Example For this example, we use a main program, and a plugin. The parent provides a function named parent_callback() for the plugin to call. The plugin provides a function named plugin_func() to the parent: % cat main.c #include <stdio.h> #include <dlfcn.h> #include <link.h> void parent_callback(void) { printf("plugin_func() has called parent_callback()\n"); } int main(int argc, char **argv) { typedef void plugin_func_t(void); void *hdl; plugin_func_t *plugin_func; if (argc != 2) { fprintf(stderr, "usage: main plugin\n"); return (1); } if ((hdl = dlopen(argv[1], RTLD_LAZY)) == NULL) { fprintf(stderr, "unable to load plugin: %s\n", dlerror()); return (1); } plugin_func = (plugin_func_t *) dlsym(hdl, "plugin_func"); if (plugin_func == NULL) { fprintf(stderr, "unable to find plugin_func: %s\n", dlerror()); return (1); } (*plugin_func)(); return (0); } % cat plugin.c #include <stdio.h> extern void parent_callback(void); void plugin_func(void) { printf("parent has called plugin_func() from plugin.so\n"); parent_callback(); } Building this in the traditional manner, without -zdefs: % cc -o main main.c % cc -G -o plugin.so plugin.c % ./main ./plugin.so parent has called plugin_func() from plugin.so plugin_func() has called parent_callback() As noted above, when building any shared object, the -z defs option is recommended, in order to ensure that the object is self contained and specifies all of its dependencies. However, the use of -z defs prevents the plugin object from linking due to the unsatisfied symbol from the parent object: % cc -zdefs -G -o plugin.so plugin.c Undefined first referenced symbol in file parent_callback plugin.o ld: fatal: symbol referencing errors. No output written to plugin.so A mapfile can be used to specify to ld that the parent_callback symbol is supplied by the parent object. % cat plugin.mapfile $mapfile_version 2 SYMBOL_SCOPE { global: parent_callback { FLAGS = PARENT }; }; % cc -zdefs -Mplugin.mapfile -G -o plugin.so plugin.c However, the -z parent option to ld is the most direct solution to this problem, allowing the plugin to actually link against the parent object, and obtain the available symbols from it. An added benefit of using -z parent instead of a mapfile, is that the name of the parent object is recorded in the dynamic section of the plugin, and can be displayed by the file utility: % cc -zdefs -zparent=main -G -o plugin.so plugin.c % elfdump -d plugin.so | grep PARENT [0] SUNW_PARENT 0xcc main % file plugin.so plugin.so: ELF 32-bit LSB dynamic lib 80386 Version 1, parent main, dynamically linked, not stripped % ./main ./plugin.so parent has called plugin_func() from plugin.so plugin_func() has called parent_callback() We can also observe this in elfedit plugins on Solaris systems running Solaris 11 Update 1 or newer: % file /usr/lib/elfedit/dyn.so /usr/lib/elfedit/dyn.so: ELF 32-bit LSB dynamic lib 80386 Version 1, parent elfedit, dynamically linked, not stripped, no debugging information available Related Other Work The GNU ld has an option named --just-symbols that can be used in a similar manner: --just-symbols=filename Read symbol names and their addresses from filename, but do not relocate it or include it in the output. This allows your output file to refer symbolically to absolute locations of memory defined in other programs. You may use this option more than once. -z parent is a higher level operation aimed specifically at simplifying the construction of high quality plugins. Although it employs the same operation, it differs from --just symbols in 2 significant ways: There can only be one parent. The parent is recorded in the created object, and can be displayed by 'file', or other similar tools.

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  • How to use the Netduino Go Piezo Buzzer Module

    - by Chris Hammond
    Originally posted on ChrisHammond.com Over the next couple of days people should be receiving their Netduino Go Piezo Buzzer Modules , at least if they have ordered them from Amazon. I was lucky enough to get mine very quickly from Amazon and put together a sample project the other night. This is by no means a complex project, and most of it is code from the public domain for projects based on the original Netduino. Project Overview So what does the project do? Essentially it plays 3 “tunes” that...(read more)

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  • Website speed issue

    - by Jose David Garcia Llanos
    I've exhausted all my options. The website that I am developing had a load speed of 1.12 seconds and for some unknown reason it is now taking 2 seconds to connect then load. I've tried deactivating loads of plugins but is not the plugins or javascript or images. http://tools.pingdom.com/fpt/#!/ONC4QfFJt/n1bar.com I've tried re-configuring the cache and the .htacess file but still taking long for the first connection. Can someone help me find the problem...

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  • SSAS DMVs: useful links

    - by Davide Mauri
    From time to time happens that I need to extract metadata informations from Analysis Services DMVS in order to quickly get an overview of the entire situation and/or drill down to detail level. As a memo I post the link I use most when need to get documentation on SSAS Objects Data DMVs: SSAS: Using DMV Queries to get Cube Metadata http://bennyaustin.wordpress.com/2011/03/01/ssas-dmv-queries-cube-metadata/ SSAS DMV (Dynamic Management View) http://dwbi1.wordpress.com/2010/01/01/ssas-dmv-dynamic-management-view/ Use Dynamic Management Views (DMVs) to Monitor Analysis Services http://msdn.microsoft.com/en-us/library/hh230820.aspx

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  • Web Developer or Web Designer

    - by user1702801
    I have built 10+ straightforward websites using the Symfony framework and Wordpress. Does this mean I am a web developer or a web designer? I set the sites up in Symfony and wrote the CSS/Javascript/HTML. I had to write themes for Wordpress and move some code about. What experience do I need to to be a web developer and not a designer? What experience distinguishes me from a designer that knows HTML and jQuery?

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  • Ashamed to admit using jQuery?

    - by Matt Stevens
    Something I've noticed over the past few weeks is how many big commercial websites use jQuery combined with lots of plugins - but don't admit it. They will rename the main library to something obscure, as well as the plugins. Quite a few will even remove the comments that contain the MIT/GPL license information. (just noticed today that odeon.co.uk have done exactly this) Why are they doing this? are they abashed by the face that they are using a free and open source library?

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  • Java EE 5, d'Antonio Goncalves, critique par Philippe Vialatte

    Je vous propose une critique pour le livre Java EE5 : EJB 3.0 - JPA - JSP - JSF - Web services - JMS - GlassFish 3 - Maven 3: Amazon.fr: Antonio Goncalves: Livres [IMG]http://images-eu.amazon.com/images/P/2212126581.08.LZZZZZZZ.jpg[/IMG] Citation: Ce cahier détaille la conception d'un site de e-commerce avec UML et Java Enterprise Edition 5. Inspirée du Java Petstore, l'étude de cas se construit au fil des chapitres en appliq...

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  • My blog has now moved to http://dataidol.com/tonyrogerson

    - by tonyrogerson
    I've decided to implement a new blogging infrastructure based on WordPress; the community server stuff I'm using has got a bit tired and WordPress offers a wealth of plug-ins to do pretty much everything I want.So, see http://dataidol.com/tonyrogerson for my new blog; its not just a move, I have broadened my coverage to encompass all things data, the first couple of posts talk about Short-Stroking hard disks (something I've presented on a number of times now), I've also got some Erlang content.Anyway, enjoy!T

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  • How do I get my Google+ picture to show up on Google searches?

    - by daviesgeek
    I am looking to move my blog: The Geek Tech Blog (which is currently a Blogger blog), over to a .com name with Wordpress. However, I still would lik my picture from Google+ to show up in search results like this, as it adds a personal touch to my blog: How do I make the picture show up on Google searches with a .com name and a Wordpress blog? I have no idea how that showed up in Google searches, as I did nothing to get the picture to show up (as far as I know).

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  • Can I use my computer as an A2DP receiver?

    - by Pierre-Yves Gillier
    First, the problem: I'm using a Cowon MP3 player as my main music player with basic earplugs. It offers A2DP & I'd like to have my netbook (running UNE 10.04) act as receiver. Some resources on the web about a2dp, but most are out of date: http://fosswire.com/post/2008/10/better-bluetooth-audio/ http://jprvita.wordpress.com/2009/12/15/1-2-3-4-a2dp-stream/ http://dpillay.wordpress.com/2010/09/27/ubuntu-10-04-a2dp-awesome-headset-music/

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  • Week in Geek: Study finds Men more Likely to Fall for Facebook Scams

    - by Asian Angel
    This week we learned how to “read Blue Screen codes, clean your computer, & get started with scripting”, upgrade or install Mac OS X Lion on a Hackintosh using UniBeast, use Amazon’s barcode scanner to easily buy anything from your phone, had fun with a great set of geeky do-it-yourself projects for pets, got introduced to How-To Geek’s new Google+ account, and more. Photo by mac_filko. Use Amazon’s Barcode Scanner to Easily Buy Anything from Your Phone How To Migrate Windows 7 to a Solid State Drive Follow How-To Geek on Google+

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  • Latest and Smartest Web Investment Guide

    One of the hottest trends on the internet these days is the creation of blogs. People create their blogs and post relevant topics on their blogs in the hope of being able to catch the attention of readers and have them revisit the blogs frequently. The blogs are linked to Google or Amazon and then for each person that visits the blog, the owner of the blog space gets paid by Google and Amazon.

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  • MCSD Certification, any recommended study material?

    - by Dayan
    I wish to study for the new MCSD Certification For web applications: I headed over to Amazon in search of some books and had no luck with finding anything up to date, most books are outdated, such as the list provided by Amazon MCSD Books. Is this because the test is more based on experience rather than just an understanding of the subject? Any tips and/or recommended materials will be appreciated, thank you!

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  • Is paypal's IPN reliable enough?

    - by Joann
    I am creating my first ever major plugin for Wordpress and I intend to share it to the community. It integrates paypal's subscription button which is very useful for people who wishe to build a membership site using Wordpress. Question: Is IPN reliable enough that there's no need to control the subscription thru cron myself? I have not tested my plugin for a span of a month or so though because doing so would eat a lot of my time.

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  • AWS EC2 Oracle RDB - Storing and managing my data

    - by llaszews
    When create an Oracle Database on the Amazon cloud you will need to store you database files somewhere on the EC2 cloud. There are basically three places where database files can be stored: 1. Local drive - This is the local drive that is part of the virtual server EC2 instance. 2. Elastic Block Storage (EBS) - Network attached storage that appears as a local drive. 3. Simple Storage Server (S3) - 'Storage for the Internet'. S3 is not high speed and intended for store static document type files. S3 can also be used for storing static web page files. Local drives are ephemeral so not appropriate to be used as a database storage device. The leaves EBS which is the best place to store database files. EBS volumes appear as local disk drives. They are actually network-attached to an Amazon EC2 instance. In addition, EBS persists independently from the running life of a single Amazon EC2 instance. If you use an EBS backed instance for your database data, it will remain available after reboot but not after terminate. In many cases you would not need to terminate your instance but only stop it, which is equivalent of shutdown. In order to save your database data before you terminate an instance, you can snapshot the EBS to S3. Using EBS as a data store you can move your Oracle data files from one instance to another. This allows you to move your database from one region or or zone to another. Unfortunately, to scale out your Oracle RDS on AWS you can not have read only replicas. This is only possible with the other Oracle relational database - MySQL. The free micro instances use EBS as its storage. This is a very good white paper that has more details: AWS Storage Options This white paper also discusses: SQS, SimpleDB, and Amazon RDS in the context of storage devices. However, these are not storage devices you would use to store an Oracle database. This slide deck discusses a lot of information that is in the white paper: AWS Storage Options slideshow

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  • What actions does Ubuntu trigger when battery is low?

    - by blueyed
    When the battery is low, the screen gets dimmed after a few seconds already. This appears to be some special power-saving mode, and might be related to the time in org.gnome.settings-daemon.plugins.power.time-low (1200 seconds (20 minutes) the default). While this seems to get triggered by gnome-settings-daemon, I wonder what else Ubuntu does when this happens (e.g. via DBus listeners), or other event listeners that look for a "low battery" state. It seems like something in this regard causes Ubuntu / X / the system to behave more sluggish afterwards (when the laptop is on AC again), and I would like to look into what might be causing this. I could not find anything related via dconf-editor, e.g. in org.gnome.settings-daemon.plugins.power. It appears to get setup via idle_configure in plugins/power/gsd-power-manager.c, but it's probably something more related to something that listens on the DBus interface, which gets notified via e.g.: if (!g_dbus_connection_emit_signal (manager->priv->connection, NULL, GSD_POWER_DBUS_PATH, "org.freedesktop.DBus.Properties", "PropertiesChanged", props_changed, &error)) I could imagine that some "power saving" property gets set, but not unset when AC is available anymore and/or the battery is not low anymore. I have looked at the CPU governor setting (/sys/devices/system/cpu/cpu*/cpufreq/scaling_governor), but it was ondemand. I am using gnome-settings-daemon with awesomeWM on Ubuntu 14.04. gnome-settings-daemon=3.8.6.1-0ubuntu11.1 I've also compared gsd's plugins/power/gsd-power-manager.c with the one from Debian's gnome-settings-daemon-3.12.1, but could not find anything obvious that might have been fixed/changed in this regard. I have managed to trigger the gnome-power-manager's gnome-settings plugin (which dims the screen etc), by patching upower and use it after killing the system's upower daemon. (note that it's probably only energy that is being used by gpm to calculate it by itself). It does not make the system become sluggish.. OTOH I have not heard the speaker's beeping, which might come from the BIOS, which might be involved here, too - or other programs using the kernel's interface on /sys/class/power_supply/BAT0/. --- src/linux/up-device-supply.c.orig 2014-06-07 16:48:32.735920661 +0200 +++ src/linux/up-device-supply.c 2014-06-07 16:48:39.391920525 +0200 @@ -821,6 +821,9 @@ supply->priv->energy_old_first = 0; } + percentage = 3.1f; + time_to_empty = 3*60; + energy = 5; g_object_set (device, "energy", energy, "energy-full", energy_full,

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  • Getting Started on Building a Website Or Blog

    If you are looking to build a website or blog then you have to have hosting. There is no way of getting around hosting unless you want to use a free service like WordPress.com or Blogger in which case you do not get a distinguished domain name. Your domain name would be a sub domain name. For example: yourname.wordpress.com would be your specific URL. This is not really an option for someone even remotely serious about owning a website or blog.

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  • After juju deploy : [Errno 2] No such file or directory

    - by user84471
    I get this after juju deploy. hsf@ubuntuserver:~$ juju deploy wordpress 2012-10-23 13:12:15,663 INFO Searching for charm cs:precise/wordpress in charm store [Errno 2] No such file or directory: '/home/hsf/.juju/cache/downloads/cs_3a_precise_2f_wordpress-9.charmGLg7sI.part' 2012-10-23 13:12:16,075 ERROR [Errno 2] No such file or directory: '/home/hsf/.juju/cache/downloads/cs_3a_precise_2f_wordpress-9.charmGLg7sI.part' I am using Ubuntu 12.04 server.

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  • Adding custom applications to Gnome launcher

    - by Shaftoe2702
    Looking for a utility that allows me insert an item into the list of applications that GNOME knows about. For example: I have downloaded Eclipse EE (I have some very special plugins that I need to work with, and those plugins don't "like" the version available in the default repository). I'm using GNOME 3, on Ubuntu 11.10. So I want to execute Eclipse w/o opening a terminal and running it. It must be something very simple.

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  • SEO Expert Question

    - by CheatSEO
    I have worked with a website in the past freedomist.com This site gathers wordpress articles from multiple news source sites, and then republishes them. The company that runs this site has about 50 other sites that do the same thing. They post links to sites such as twitter and secondary wordpress sites. Is this a moral way of increasing page ranking? Is this against the terms of service with lets say Google?

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  • Standalone URL 301 Redirect Manager [on hold]

    - by Lex
    I'm looking for a script with a simple interface that helps me manage a large list of 301 redirects of the form: http://example.com/short ---> http://example.com/long-and-descriptive For example the following Wordpress plugin does this job, but it seems excessive to install Wordpress just for this one simple functionality. It looks like my question is similar to this closed question, but hopefully rephrased in such a way that makes it more relevant and "constructive".

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  • Can I Hide a part of joomla link in source code? [migrated]

    - by pastor
    link rel="stylesheet" type="text/css" href="/nettt/plugins/system/jch_optimize/cache/jscss.php?f=019a87662ec9a3b8c890c566b8019f23-cache-plg_jch_optimize-652b9fac2d3cde50d0b5ec53b6e540d4&amp;type=css&amp;gz=gz&amp;d=30"/> I wont to hide /nettt/plugins/system/jch_optimize/cache/jscss.php?f=019a87662ec9a3b8c890c566b8019f23-cache-plg_jch_optimize-652b9fac2d3cde50d0b5ec53b6e540d4&amp any ideas?

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  • ????????·???

    - by katsumii
    ???????????????????? ?????5????????????????????? ?????????K???????????????SQL?????Celko?????????????????????????????????????????Joe Celko - Wikipedia, the free encyclopediaHe has participated on the ANSI X3H2 Database Standards Committee, and helped write the SQL-89 and SQL-92 standards.???NoSQL????????????Joe Celko's Complete Guide to NoSQL: What Every SQL Professional Needs to Know about Non-Relational Databases: Joe Celko: 9780124071926: Amazon.com: BooksPublication Date: October 31, 2013???????????????????3??????????Amazon.co.jp: ???·????????????SQL ?4? ???·????Joe Celko? ??? (2013/5/24)  

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