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Oracle regains the #1 UNIX Shipments Marketshare

- by EricReid-Oracle

Oracle has regained the #1 UNIX Server Shipments spot! According to IDC, Oracle’s share was 33.6%, up from 32.7% in the year ago period, and 32.2% in C4Q13: IDC: WW Unix Unit Shipments, Share, Growth 2013Q1 Share 2013Q4 Share 2014Q1 Share Sequential Growth Y/Y Growth Oracle 10,141 32.7% 10,294 32.2% 8,355 33.6% -18.8% -17.6% IBM 10,203 32.9% 11,533 36.0% 6,919 27.8% -40.0% -32.2% HP 7,046 22.7% 6,786 21.2% 6,549 26.4% -3.5% -7.1% Fujitsu 1,174 3.8% 1,141 3.6% 1,069 4.3% -6.3% -8.9% Dell 565 1.8% 499 1.6% 519 2.1% 4.0% -8.2% NEC 69 0.2% 81 0.3% 63 0.3% -22.5% -9.4% Others 1,804 5.8% 1,684 5.3% 1,380 5.6% -18.1% -23.5% Total Market 31,002 100.0% 32,018 100.0% 24,854 100.0% -22.4% -19.8% While the UNIX server space is currently undergoing some contraction (on a pure numbers basis), this can be traced in part to an overall consolidation trend, due to the greatly-increased price-performance of our systems. Consider this: one SPARC T5-4 system has 1/16th the number of sockets and 1/192nd the number of cores of the previous high-end M9000-64 system -- all at 5X the price-performance. SPARC. Solaris. Nuff' said.

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What good technology podcasts are out there?

- by Michael Stum

Yes, Podcasts, those nice little Audiobooks I can listen to on the way to work. With the current amount of Podcasts, it's like searching a needle in a haystack, except that the haystack happens to be the Internet and is filled with too many of these "Hot new Gadgets" stuff :( Now, even though I am mainly a .NET developer nowadays, maybe anyone knows some good Podcasts from people regarding the whole software lifecycle? Unit Testing, Continous Integration, Documentation, Deployment... So - what are you guys and gals listening to? Please note that the categorizations are somewhat subjective and may not be 100% accurate as many podcasts cover several areas. Categorization is made against what is considered the "main" area. General Software Engineering / Productivity Stack Overflow TekPub (Requires Paid Subscription) SE Radio 43 Folders Perspectives Dr. Dobb's (now a video feed) The Pragmatic Podcast (Inactive) IT Matters Agile Toolkit Podcast The Stack Trace (Inactive) Parleys Techzing The Startup Success Podcast Berkeley CS class lectures FOSS Weekly .NET / Visual Studio / Microsoft Herding Code Hanselminutes .NET Rocks! Deep Fried Bytes Alt.Net Podcast Polymorphic Podcast Sparkling Client (The Silverlight Podcast) dnrTV! Spaghetti Code ASP.NET Podcast Channel 9 Radio TFS PowerScripting Podcast The Thirsty Developer Elegant Code ConnectedShow Crafty Coders Coding QA jQuery yayQuery The official jQuery podcast Java / Groovy The Java Posse Grails Podcast Java Technology Insider Ruby / Rails Railscasts Rails Envy The Ruby on Rails Podcast Rubiverse Web Design / JavaScript / Ajax WebDevRadio Boagworld The Rissington podcast Ajaxian YUI Theater Unix / Linux / Mac / iPhone Mac Developer Network Hacker Public Radio Linux Outlaws Mac OS Ken LugRadio Linux radio show (Inactive) The Linux Action Show! Linux Kernel Mailing List (LKML) Summary Podcast Stanford's iPhone programming class SysAdmin, Security or Infrastructure RunAs Radio Security Now! Crypto-Gram Security Podcast Hak5 VMWare VMTN Windows Weekly PaulDotCom Security The Register - Semi-Coherent Computing FeatherCast General Tech / Business Tekzilla This Week in Tech The Guardian Tech Weekly PCMag Radio Podcast Entrepreneurship Corner Manager Tools Other / Misc. / Podcast Networks IT Conversations Retrobits Podcast No Agenda Netcast Cranky Geeks The Command Line Freelance Radio IBM developerWorks The Register - Open Season Drunk and Retired Technometria Sod This Radio4Nerds Hacker Medley

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Embedded non-relational (nosql) data store

- by Igor Brejc

I'm thinking about using/implementing some kind of an embedded key-value (or document) store for my Windows desktop application. I want to be able to store various types of data (GPS tracks would be one example) and of course be able to query this data. The amount of data would be such that it couldn't all be loaded into memory at the same time. I'm thinking about using sqlite as a storage engine for a key-value store, something like y-serial, but written in .NET. I've also read about FriendFeed's usage of MySQL to store schema-less data, which is a good pointer on how to use RDBMS for non-relational data. sqlite seems to be a good option because of its simplicity, portability and library size. My question is whether there are any other options for an embedded non-relational store? It doesn't need to be distributable and it doesn't have to support transactions, but it does have to be accessible from .NET and it should have a small download size. UPDATE: I've found an article titled SQLite as a Key-Value Database which compares sqlite with Berkeley DB, which is an embedded key-value store library.

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Compressibility Example

- by user285726

From my algorithms textbook: The annual county horse race is bringing in three thoroughbreds who have never competed against one another. Excited, you study their past 200 races and summarize these as prob- ability distributions over four outcomes: first (“first place”), second, third, and other. Outcome Aurora Whirlwind Phantasm 0.15 0.30 0.20 first 0.10 0.05 0.30 second 0.70 0.25 0.30 third 0.05 0.40 0.20 other Which horse is the most predictable? One quantitative approach to this question is to look at compressibility. Write down the history of each horse as a string of 200 values (first, second, third, other). The total number of bits needed to encode these track- record strings can then be computed using Huffman’s algorithm. This works out to 290 bits for Aurora, 380 for Whirlwind, and 420 for Phantasm (check it!). Aurora has the shortest encoding and is therefore in a strong sense the most predictable. How did they get 420 for Phantasm? I keep getting 400 bytes, as so: Combine first, other = 0.4, combine second, third = 0.6. End up with 2 bits encoding each position. Is there something I've misunderstood about the Huffman encoding algorithm? Textbook available here: http://www.cs.berkeley.edu/~vazirani/algorithms.html (page 156).

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Which key value store is the most promising/stable?

- by Mike Trpcic

I'm looking to start using a key/value store for some side projects (mostly as a learning experience), but so many have popped up in the recent past that I've got no idea where to begin. Just listing from memory, I can think of: CouchDB MongoDB Riak Redis Tokyo Cabinet Berkeley DB Cassandra MemcacheDB And I'm sure that there are more out there that have slipped through my search efforts. With all the information out there, it's hard to find solid comparisons between all of the competitors. My criteria and questions are: (Most Important) Which do you recommend, and why? Which one is the fastest? Which one is the most stable? Which one is the easiest to set up and install? Which ones have bindings for Python and/or Ruby? Edit: So far it looks like Redis is the best solution, but that's only because I've gotten one solid response (from ardsrk). I'm looking for more answers like his, because they point me in the direction of useful, quantitative information. Which Key-Value store do you use, and why? Edit 2: If anyone has experience with CouchDB, Riak, or MongoDB, I'd love to hear your experiences with them (and even more so if you can offer a comparative analysis of several of them)

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Apache restart does not load new php.ini

- by Tiffany Walker

Never had this problem till updated CPanel today? Maybe that is part the problem? I only have the one php.ini file # /usr/local/bin/php --info | grep php.ini Configure Command => './configure' '--disable-cgi' '--disable-fileinfo' '--enable-bcmath' '--enable-calendar' '--enable-exif' '--enable-ftp' '--enable-gd-native-ttf' '--enable-libxml' '--enable-magic-quotes' '--enable-mbstring' '--enable-pdo=shared' '--enable-soap' '--enable-sockets' '--enable-zip' '--prefix=/usr/local' '--with-bz2' '--with-config-file-path=/usr/local/lib' '--with-config-file-scan-dir=/usr/local/lib/php.ini.d' '--with-curl=/opt/curlssl/' '--with-curlwrappers' '--with-freetype-dir=/usr' '--with-gd' '--with-imap=/opt/php_with_imap_client/' '--with-imap-ssl=/usr' '--with-jpeg-dir=/usr' '--with-kerberos' '--with-libdir=lib64' '--with-libexpat-dir=/usr' '--with-libxml-dir=/opt/xml2' '--with-libxml-dir=/opt/xml2/' '--with-mcrypt=/opt/libmcrypt/' '--with-mysql=/usr' '--with-mysql-sock=/var/lib/mysql/mysql.sock' '--with-mysqli=/usr/bin/mysql_config' '--with-openssl=/usr' '--with-openssl-dir=/usr' '--with-pcre-regex=/opt/pcre' '--with-pdo-mysql=shared' '--with-pdo-sqlite=shared' '--with-pic' '--with-png-dir=/usr' '--with-pspell' '--with-sqlite=shared' '--with-tidy=/opt/tidy/' '--with-xmlrpc' '--with-xpm-dir=/usr' '--with-xsl=/opt/xslt/' '--with-zlib' '--with-zlib-dir=/usr' '--with-gettext' Configuration File (php.ini) Path => /usr/local/lib Loaded Configuration File => /usr/local/lib/php.ini Scan this dir for additional .ini files => /usr/local/lib/php.ini.d # /usr/bin/php --info | grep php.ini <tr><td class="e">Configure Command </td><td class="v"> './configure' '--disable-fileinfo' '--enable-bcmath' '--enable-calendar' '--enable-exif' '--enable-ftp' '--enable-gd-native-ttf' '--enable-libxml' '--enable-magic-quotes' '--enable-mbstring' '--enable-pdo=shared' '--enable-soap' '--enable-sockets' '--enable-zip' '--prefix=/usr' '--with-bz2' '--with-config-file-path=/usr/local/lib' '--with-config-file-scan-dir=/usr/local/lib/php.ini.d' '--with-curl=/opt/curlssl/' '--with-curlwrappers' '--with-freetype-dir=/usr' '--with-gd' '--with-imap=/opt/php_with_imap_client/' '--with-imap-ssl=/usr' '--with-jpeg-dir=/usr' '--with-kerberos' '--with-libdir=lib64' '--with-libexpat-dir=/usr' '--with-libxml-dir=/opt/xml2' '--with-libxml-dir=/opt/xml2/' '--with-mcrypt=/opt/libmcrypt/' '--with-mysql=/usr' '--with-mysql-sock=/var/lib/mysql/mysql.sock' '--with-mysqli=/usr/bin/mysql_config' '--with-openssl=/usr' '--with-openssl-dir=/usr' '--with-pcre-regex=/opt/pcre' '--with-pdo-mysql=shared' '--with-pdo-sqlite=shared' '--with-pic' '--with-png-dir=/usr' '--with-pspell' '--with-sqlite=shared' '--with-tidy=/opt/tidy/' '--with-xmlrpc' '--with-xpm-dir=/usr' '--with-xsl=/opt/xslt/' '--with-zlib' '--with-zlib-dir=/usr' </td></tr> <tr><td class="e">Configuration File (php.ini) Path </td><td class="v">/usr/local/lib </td></tr> <tr><td class="e">Loaded Configuration File </td><td class="v">/usr/local/lib/php.ini </td></tr> <tr><td class="e">Scan this dir for additional .ini files </td><td class="v">/usr/local/lib/php.ini.d </td></tr> everytime I restart apache I still seem to be running the old one. Nothing changes. I removed phpinfo() and ini_set() from the php.ini but I still can't use them. # service httpd -k restart [Fri Oct 26 15:27:10 2012] [warn] module hostinglimits_module is already loaded, skipping [Fri Oct 26 15:27:10 2012] [warn] NameVirtualHost 127.0.0.1:8081 has no VirtualHosts There is also no php.ini files under the vhosts or .htaccess. # /usr/bin/php -v PHP 5.3.15 (cgi-fcgi) (built: Aug 4 2012 21:33:58) Copyright (c) 1997-2012 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies with eAccelerator v0.9.6.1, Copyright (c) 2004-2010 eAccelerator, by eAccelerator with the ionCube PHP Loader v4.2.2, Copyright (c) 2002-2012, by ionCube Ltd., and with Zend Guard Loader v3.3, Copyright (c) 1998-2010, by Zend Technologies with Suhosin v0.9.33, Copyright (c) 2007-2012, by SektionEins GmbH and # /usr/local/bin/php -v PHP 5.3.15 (cli) (built: Aug 4 2012 21:34:27) Copyright (c) 1997-2012 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies with eAccelerator v0.9.6.1, Copyright (c) 2004-2010 eAccelerator, by eAccelerator with the ionCube PHP Loader v4.2.2, Copyright (c) 2002-2012, by ionCube Ltd., and with Zend Guard Loader v3.3, Copyright (c) 1998-2010, by Zend Technologies with Suhosin v0.9.33, Copyright (c) 2007-2012, by SektionEins GmbH Nothing shows up in the error logs either. The only errors we get are under the vhost's with error_log saying phpinfo and ini_set are disabled. EDIT: Both php binaries use the same php.ini file EDIT: Running php as mod_fgcid.so with suexec EDIT: From SSH I see the correct values for PHP from the php.ini file being loaded from both binaries When using php from apache [26-Oct-2012 20:25:34 UTC] PHP Warning: phpinfo() has been disabled for security reasons in /home/jake/public_html/phpinfo.php on line 1 EDIT: /usr/bin/php is the correct PHP file. Forgot to mention. It is the one in the wrapper script.

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Silverlight Ftp Upload

- by Curtis

Hi I'm working on trying to ftp a file to the server through a silverlight application. Where the location to upload the file on server file system, exists outside the sandbox area for the web server. In this case the web server root exists at "C:\test\www\" and the location to upload the file will exist at "C:\User\Uploads". In this scenerio i'm not sure if Http POST will work (doesn't that use the web server root). I just need to upload the file selected by the user to a different location that may exist outside the sandbox. With silverlight i'm thinking sockets are my last option based on the limited port range for silverlight being 4502-4532. Can i do this using WebClient and Http POST? Can i make an ftp connection through silverlight or javascript?

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HttpWebRequest and BindIPEndPointDelegate getting socket exception

- by Evgeny Gavrin

I've got c# code running on a computer with multiple network interfaces, and the following code to select an IP address for a HttpWebRequest to bind ServicePoint: HttpWebRequest request = (HttpWebRequest)WebRequest.Create(remoteFilename); request.KeepAlive = false; request.ServicePoint.BindIPEndPointDelegate = delegate( ServicePoint servicePoint, IPEndPoint remoteEndPoint, int retryCount) { return new IPEndPoint(IPAddress.Parse(ipAddr), 0); }; But it works only for one of the available network interfaces. Trying to access remote server through others throws an exception: System.Net.WebException: Unable to connect to the remote server --- System.Net.Sockets.SocketException: A socket operation was attempted to an unreachable network How can it be solved?

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ruby on rails configuration

- by Themasterhimself

Im using the following guide for getting started with rails for ubuntu 9.10. http://guides.rails.info/getting_started.html I have installed both ruby and gem. gokul@gokul-laptop:~$ ruby -v ruby 1.8.7 (2009-06-12 patchlevel 174) [i486-linux] gokul@gokul-laptop:~$ gem -v 1.3.6 gokul@gokul-laptop:~$ For rails, gokul@gokul-laptop:~$sudo gem install rails doesnt seem to give any response. so used the synaptic package manager for installing it. And it seems to have installed correctly. gokul@gokul-laptop:~$ rails Usage: /usr/bin/rails /path/to/your/app [options] Options: -r, --ruby=path Path to the Ruby binary of your choice (otherwise scripts use env, dispatchers current path). Default: /usr/bin/ruby1.8 -d, --database=name Preconfigure for selected database (options: mysql/oracle/postgresql/sqlite2/sqlite3/frontbase/ibm_db). Default: sqlite3 -D, --with-dispatchers Add CGI/FastCGI/mod_ruby dispatches code to generated application skeleton Default: false --freeze Freeze Rails in vendor/rails from the gems generating the skeleton Default: false -m, --template=path Use an application template that lives at path (can be a filesystem path or URL). Default: (none) Rails Info: -v, --version Show the Rails version number and quit. -h, --help Show this help message and quit. General Options: -p, --pretend Run but do not make any changes. -f, --force Overwrite files that already exist. -s, --skip Skip files that already exist. -q, --quiet Suppress normal output. -t, --backtrace Debugging: show backtrace on errors. -c, --svn Modify files with subversion. (Note: svn must be in path) -g, --git Modify files with git. (Note: git must be in path) Description: The 'rails' command creates a new Rails application with a default directory structure and configuration at the path you specify. Example: rails ~/Code/Ruby/weblog This generates a skeletal Rails installation in ~/Code/Ruby/weblog. See the README in the newly created application to get going. gokul@gokul-laptop:~$ app folder is created with all the proper folders. The problem starts with the following commands... gokul@gokul-laptop:~$ sudo gem install bundler [sudo] password for gokul: Successfully installed bundler-0.9.24 1 gem installed Installing ri documentation for bundler-0.9.24... Installing RDoc documentation for bundler-0.9.24... gokul@gokul-laptop:~$ bundle install Could not locate Gemfile gokul@gokul-laptop:~$ coming to the database, the default sqlite3 seems to have installed correctly. gokul@gokul-laptop:~$ sqlite3 SQLite version 3.6.16 Enter ".help" for instructions Enter SQL statements terminated with a ";" sqlite The welcome aboard page is not being able to be found at (http://localhost:3000) after executing the following commands... gokul@gokul-laptop:~/Desktop$ rails blog create create app/controllers create app/helpers create app/models create app/views/layouts create config/environments create config/initializers create config/locales create db create doc create lib create lib/tasks create log create public/images create public/javascripts create public/stylesheets create script/performance create test/fixtures create test/functional create test/integration create test/performance create test/unit create vendor create vendor/plugins create tmp/sessions create tmp/sockets create tmp/cache create tmp/pids create Rakefile create README create app/controllers/application_controller.rb create app/helpers/application_helper.rb create config/database.yml create config/routes.rb create config/locales/en.yml create db/seeds.rb create config/initializers/backtrace_silencers.rb create config/initializers/inflections.rb create config/initializers/mime_types.rb create config/initializers/new_rails_defaults.rb create config/initializers/session_store.rb create config/environment.rb create config/boot.rb create config/environments/production.rb create config/environments/development.rb create config/environments/test.rb create script/about create script/console create script/dbconsole create script/destroy create script/generate create script/runner create script/server create script/plugin create script/performance/benchmarker create script/performance/profiler create test/test_helper.rb create test/performance/browsing_test.rb create public/404.html create public/422.html create public/500.html create public/index.html create public/favicon.ico create public/robots.txt create public/images/rails.png create public/javascripts/prototype.js create public/javascripts/effects.js create public/javascripts/dragdrop.js create public/javascripts/controls.js create public/javascripts/application.js create doc/README_FOR_APP create log/server.log create log/production.log create log/development.log create log/test.log gokul@gokul-laptop:~/Desktop$ cd blog gokul@gokul-laptop:~/Desktop/blog$ rake db:create (in /home/gokul/Desktop/blog) gokul@gokul-laptop:~/Desktop/blog$ rails server create create app/controllers create app/helpers create app/models create app/views/layouts create config/environments create config/initializers create config/locales create db create doc create lib create lib/tasks create log create public/images create public/javascripts create public/stylesheets create script/performance create test/fixtures create test/functional create test/integration create test/performance create test/unit create vendor create vendor/plugins create tmp/sessions create tmp/sockets create tmp/cache create tmp/pids create Rakefile create README create app/controllers/application_controller.rb create app/helpers/application_helper.rb create config/database.yml create config/routes.rb create config/locales/en.yml create db/seeds.rb create config/initializers/backtrace_silencers.rb create config/initializers/inflections.rb create config/initializers/mime_types.rb create config/initializers/new_rails_defaults.rb create config/initializers/session_store.rb create config/environment.rb create config/boot.rb create config/environments/production.rb create config/environments/development.rb create config/environments/test.rb create script/about create script/console create script/dbconsole create script/destroy create script/generate create script/runner create script/server create script/plugin create script/performance/benchmarker create script/performance/profiler create test/test_helper.rb create test/performance/browsing_test.rb create public/404.html create public/422.html create public/500.html create public/index.html create public/favicon.ico create public/robots.txt create public/images/rails.png create public/javascripts/prototype.js create public/javascripts/effects.js create public/javascripts/dragdrop.js create public/javascripts/controls.js create public/javascripts/application.js create doc/README_FOR_APP create log/server.log create log/production.log create log/development.log create log/test.log gokul@gokul-laptop:~/Desktop/blog$ hope some one can help me with this...

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Convert IP address string to binary in Python

- by pizzim13

As part of a larger application, I am trying to convert an IP address to binary. Purpose being to later calculate the broadcast address for Wake on LAN traffic. I am assuming that there is a much more efficient way to do this then the way I am thinking. Which is breaking up the IP address by octet, adding 0's to the beginning of each octet where necessary, converting each octet to binary, then combining the results. Should I be looking at netaddr, sockets, or something completely different? Example: From 192.168.1.1 to 11000000.10101000.00000001.00000001

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how to install posix in php

- by Nizzy

posix does not appear when I run php -m cmd, however, I see it from the phpinfo() –enable-posix=shared on Linux with Plesk 9. Basically, I can't use posix_*() functions as described at http://www.php.net/manual/en/ref.posix.php this shows doesn't exists: if (function_exists(‘posix_getuid’)) { echo “posix_getuid available”; } else { echo “posix_getuid not available”; // this prints in my server. } could someone show me how to install it? thank you [PHP Modules] bz2 calendar ctype curl date dbase dom exif fileinfo filter ftp gd geoip gettext gmp hash iconv imap ionCube Loader json libxml mbstring mcrypt memcache mhash mysql mysqli openssl pcntl pcre PDO pdo_mysql pdo_sqlite readline Reflection session shmop SimpleXML sockets SPL sqlite standard tokenizer wddx xml xmlreader xmlwriter xsl zip zlib

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socat usage for FIFO speed vs socket speed on localhost

- by Fishy

Hello, As per a suggestion on stackoverflow, to compare IPC on a single machine using a) sockets (TCP) on localhost to localhost b) using FIFOs (between Java and C) To answer (a), I used netcat to gauge transfer speed (91 MBytes/sec)[1] (b) Q: How can I test FIFO write speed using socat? My approach(where /tmp/gus is created using mkfifo on RHEL): dd if=/dev/zero of=/tmp/gus bs=1G count=1 but i get: 1073741824 bytes (1.1 GB) copied, 1.1326 seconds, 948 MB/s Does this mean writing to a FIFO ~10 times faster? Or is my experiment completely wrong ? Thank you Sporsi [1] From machine A to B across 1Gbps link, this number dropped to ~80 MBytes/sec - I expected localhost to be much higher ...

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Tiny, very-basic outgoing MTA?

- by Xeoncross

I am looking for a very tiny Mail-Transfer-Agent (MTA) for my smaller VPS which only need to send emails for new accounts or notifications. Originally, I used PHP sockets and wrote a 4kb STMP class to connect to google SMTP and send the emails - but I would like to be free of the 500 emails a day (or whatever) limit they have. On larger VPS I can run Postfix - but it takes about 50MB which makes it too big for a 128/256MB VPS. So are there any very tiny MTA's out there - or is there a rundown of the protocol of sending email (I guess it works by forwarding the mail through other servers till it reaches the correct end mail server right?) so I could build a smaller bash or PHP script for this outgoing stuff?

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SLES 9 vs. SLES 10

- by Michael Covelli

Are there any important change in how SLES 10 implements Tcp sockets vs. SLES 9? I have several apps written in C# (.NET 3.5) that run on Windows XP and Windows Server 2003. They've been running fine for over a year, getting market data from a SLES 9 machine using a socket connection. The machine was upgraded today to SLES 10 and its causing some strange behavior. The socket normally returns a few hundred or thousand bytes every second. But occasionally, I stop receiving data. Ten or more seconds will go by with no data and then Receive returns with a 10k+ bytes. And some buffer is causing data loss because the bytes I receive on the socket no longer make a correct packet. The only thing changed was the SLES 9 to 10 upgrade. And rolling back fixes this immediately. Any ideas?

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Java: Read POST data from a socket on an HTTP server

- by danpalmer

I have a website (python/django) that needs to use a load of Java resources that may or may not be on the same server. Therefore I am writing a mini webserver in Java that will receive a request and then when processing is finished, POST some data back to a url on the site. I have got the java code receiving connections on sockets and responding with some simple HTML. My problem is that I will POST data to the Java server and that code needs to act on the data. How do I go about reading the data that is posted in the HTML request, if it is even possible. If not, is there any other way you would do this. If you think I am going about this in completely the wrong way then please tell me and I will consider another method, but after conversing with some Java developers, this seemed like the best way for what I was doing. Thanks

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Are there some general Network programming best practices?

- by uriDium

I am implementing some networking stuff in our project. It has been decided that the communication is very important and we want to do it synchronously. So the client sends something the server acknowledges. Are there some general best practices for the interaction between the client and the server. For instance if there isn't an answer from the server should the client automatically retry? Should there be a timeout period before it retries? What happens if the acknowledgement fails? At what point do we break the connection and reconnect? Is there some material? I have done searches but nothing is really coming up. I am looking for best practices in general. I am implementing this in c# (probably with sockets) so if there is anything .Net specific then please let me know too.

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Problem sending mail with simple .net application. Server refusal error.

- by Fatih

I have a very simple .net application for testing SMTP on .net. But i am receiving this weird error. "System.Net.Mail.SmtpException: Failure sending mail. --- System.Net.WebException: Unable to connect to the remote server --- System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it" SMTP server is remote and doesn't need any kind of authentication so i don't need credentials. But i can send mails from this computer with outlook using same smtp server and same smtp settings without any problem. Any ideas? It will be appreciated so much. Imports System.Net.Mail Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim smtp As New SmtpClient smtp.Host = "10.241.128.220" smtp.Port = 25 smtp.Send("[email protected]", "[email protected]", "test", "test") End Sub

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What technical skills needed for algorithmic trading, HFT, etc?

- by alchemical

I'm interested in getting into developing trading systems, black box, HFT, etc. My primary experience is with C# and .Net (7 years). I've also done some sockets programming. I have some experience in finance working on analysis applications (2 years). My goal is to move into developing automated trading systems for a hedge fund, bank, etc. Is there any way to learn the skills needed for this without somehow getting the job first? I've looked at the open source tradelink, IB interactive brokerage, etc. I'm playing around with this framework, and may hook it up and do some paper trading. However, I'm not sure if this has much relationship with how a well-funded entity would be conducting a high-level automated trading operation. I.e. would the tools and frameworks they prefer be a totally different skill-set? Also wondering if I need to learn C++ and/or Java for these types of apps.

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Using Protocol Buffers in J2EE?

- by mlaverd

Hello everyone, I have coded a server that uses Protocol Buffers in Java. A client talks to it using PB. I'd like to migrate the server code to J2EE and take advantage of the containers' built-in features like clustering. How can I have a service that receives PB messages and interprets them properly, and then gets them handled? I was thinking of a dedicated type of servlet, but how can it be done? I'm a J2EE newbie... I'm not familiar enough with J2EE application servers to know if there is a way to make that happen. P.S. I'm looking for a solution that uses TLS sockets directly. No overhead-causing middleman protocols like HTTP are welcome here. P.P.S. Open source solutions only please.

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Windows Network Programming

- by bdhar

I am planning to get some good book for Windows Socket Programming in VC++. I have 2+ years of experience in working with VC++/ATL/COM/MFC; but not in the networking domain. I have been doing some search in Google for "Windows network programming" books. There are few but they have both good and bad comments scattered all over; and I am not able to decide anything. Please recommend some good book with Pros and Cons. The books I found are below. Windows Sockets Network programming Network Programming for Microsoft Windows Thanks.

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linux: disable using loopback and send data via wire between 2 eth cards of one comp

- by osgx

Hello I have a comp with 2 eth cards, connected with patch-cord (direct eth. cable from 1st to 2nd). The linux is installed, I want to send data from 1st network card to 2nd. And I want to force the packet to pass via cable. I can set up any ip on cards. With ping I get counters on cards constant. Is it possible with tcp/ip sockets? PS. I need to write a program. which will send packets via eth, so stackoverflow-related question. There can be some OS-dependent way, they will help me too

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How can I pre-authorize authopen?

- by Georg

I'm using authopen inside one of my programs to modify files owned by root. As can be seen in the screenshot below authopen asks for a admin password. What I'd like to achieve is that the dialog shows my app's name and then passes the authorization to authopen. Code Launching authopen which returns an authorized file descriptor. int pipe[2]; socketpair(AF_UNIX, SOCK_STREAM, 0, pipe); if (fork() == 0) { // child // close parent's pipe close(pipe[0]); dup2(pipe[1], STDOUT_FILENO); const char *authopenPath = "/usr/libexec/authopen"; execl(authopenPath, authopenPath, "-stdoutpipe", [self.device.devicePath fileSystemRepresentation], NULL); NSLog(@"Fatal error, quitting."); exit(-1); } // parent // close childs's pipe close(pipe[1]); // get file descriptor through sockets I'd really like not to use AuthorizationExecuteWithPrivileges because then I'd have to get more rights than I want to.

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Dynamics of the using keyword

- by AngryHacker

Consider the following code: // module level declaration Socket _client; void ProcessSocket() { _client = GetSocketFromSomewhere(); using (_client) { DoStuff(); // receive and send data Close(); } } void Close() { _client.Close(); _client = null; } Given that that the code calls the Close() method, which closes the _client socket and sets it to null, while still inside the `using' block, what exactly happens behind the scenes? Does the socket really get closed? Are there side effects? P.S. This is using C# 3.0 on the .NET MicroFramework, but I suppose the c#, the language, should function identically. The reason i am asking is that occasionally, very rarely, I run out of sockets (which is a very precious resource on a .NET MF devices).

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TcpListener.Start() does not open the port

- by SoMoS

Hello, I have a class that inherits from the TcpListener, this class Shadows the Start method just to call the base Start() and the base BeginAcceptTcpClient(). From time to time the method is called but the port is not opened (netstat does not show the port open). The class looks like this Public Class ExtendedTcpListener Inherits System.Net.Sockets.TcpListener Public Shadows Sub Start() SyncLock (m_stopLock) MyBase.Start() MyBase.BeginAcceptTcpClient(AddressOf Me.CompleteAcceptTcpClient, Me) My.Application.Log.WriteEntry("Extended Tcp Listener started ...", TraceEventType.Verbose) End SyncLock End Sub Any idea on what's happening or how to debug the issue? As the Start() is called without exception I expected to find the port always opened (the log is always written). Extra information: when the Start method works fine it works each time until app is restarted. When the Start method does not work it won't work again until the app is restarted.

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Reading UDP Packets

- by Thomas Mathiesen

I am having some trouble dissecting a UDP packet. I am receiving the packets and storing the data and sender-address in variables 'data' and 'addr' with: data,addr = UDPSock.recvfrom(buf) This parses the data as a string, that I am now unable to turn into bytes. I know the structure of the datagram packet which is a total of 28 bytes, and that the data I am trying to get out is in bytes 17:28. I have tried doing this: mybytes = data[16:19] print struct.unpack('>I', mybytes) --> struct.error: unpack str size does not match format And this: response = (0, 0, data[16], data[17], 6) bytes = array('B', response[:-1]) print struct.unpack('>I', bytes) --> TypeError: Type not compatible with array type And this: print "\nData byte 17:", str.encode(data[17]) --> UnicodeEncodeError: 'ascii' codec can't encode character u'\xff' in position 0: ordinal not in range(128) And I am not sure what to try next. I am completely new to sockets and byte-conversions in Python, so any advice would be helpful :) Thanks, Thomas

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