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Articles indexed Thursday February 24 2011

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• Were you a good programmer when you first left university?

  - by dustyprogrammer

  I recently graduated, from university. I have since then joined a development team where I am by far the least experienced developer, with maybe with a couple work terms under my belt, meanwhile the rest of the team is rocking 5-10 years experience. I am/was a very good student and a pretty good programmer when it came to bottled assignments and tests. I have worked on some projects with success. But now I working with a much bigger code-base, and the learning curve is much higher... I was wondering how many other developers started out their careers in teams and left like they sucked. When does this change? How can I speed up the process? My seniors are helping me but I want to be great and show my value now. I don't to start a flame war, this is just a question I have been having and I was hoping to get some advice from other experienced developers, as well as other beginners like me.

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• Simulating simultaneous entities

  - by Steven Jeuris

  Consider the need to simulate a set of entitities in an accurate way. All entities exist in an artificial timeline. Within 'steps' of this timeline, all entities can do certain operations. It is imperative that timed events, are handled accurately, and not in processing order. So simple threading isn't a proper simulation, nor is procedurally walking across all entities. Processing may be slow, accuracy is key here. I have some ideas how to implement this myself, but most likely something like this has been done before. Are there any frameworks available for these purposes? Is there any particular paradigm more suitable?

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• rc.local is not always executed upon boot

  - by starcorn

  Hey, I have some weird problem with the rc.local file which is located in /etc/rc.local the thing is that it is not always running when I boot up the laptop. Maybe every second time, I haven't counted. Anyway when that happens I have to manually go to terminal and type sudo /etc/init.d/rc.local start, which kinda kills the purpose of having this script. Anyone know what the problem could be? EDIT Since this wasn't obvious. This is an issue where I make a fresh boot up. Which mean I have shut down the computer. And next time when I boot up the computer, the rc.local file is randomly deciding whether it will automatically start or not. Here's a copy of what my rc.local file contains echo -n 255 > /sys/devices/platform/i8042/serio1/serio2/sensitivity echo level 2 > /proc/acpi/ibm/fan touch /home/starcorn/Desktop/foo rfkill block bluetooth exit 0

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• USB device changes using udev and D-Bus

  - by kicsyromy

  I am trying to get a list of currently plugged in USB devices in Ubuntu 10.10 and monitor changes that happen, like devices being plugged in or out using udev and D-Bus. I'm fairly new to programming using D-Bus. I saw one example: "Linux: How to detect is usb keyboard is plugged and unplugged". Problem is that it uses HAL and I know that HAL is deprecated. I found some working code, but it's working only with storage devices such as USB sticks, media players or CD-ROM drives. I want the whole thing: mice, keyboards, USB cameras, chargers; anything that is plugged in to the USB. How can I listen D-Bus events for any USB device plug and unplug? This is basically what I have now (also): import dbus import gobject from dbus.mainloop.glib import DBusGMainLoop def device_added_callback(device): print 'Device %s was added' % (device) def device_changed_callback(device): print 'Device %s was changed' % (device) #must be done before connecting to DBus DBusGMainLoop(set_as_default=True) bus = dbus.SystemBus() proxy = bus.get_object("org.freedesktop.UDisks", "/org/freedesktop/UDisks") iface = dbus.Interface(proxy, "org.freedesktop.UDisks.Device") devices = iface.get_dbus_method('EnumerateDevices')() print '%s' % (devices) #addes two signal listeners iface.connect_to_signal('DeviceAdded', device_added_callback) iface.connect_to_signal('DeviceChanged', device_changed_callback) #start the main loop mainloop = gobject.MainLoop() mainloop.run()

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• Unable to mount 1TB USB external HDD - Error

  - by superbDeveloper

  Hi, I'm getting an error when I plug in my 1TB USB external HDD, the wierd thing about this is that it was working fine before and I've been using it for about a couple of months now. yesterday I compressed one of the folders which had about 120GB of data but the compression failed after an hour and I decided to unmount the drive and shut everything down. Today when I tried to plug in the drive I got the following error: Error mounting: mount: wrong fs type, bad option, bad superblock on /dev/sdc, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so output of cat /proc/partitions below muzikayise@muzikayise-supercom:~$ sudo fdisk -l /dev/sdc Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x39dcba64 Device Boot Start End Blocks Id System please will someone kindly assist with this? thanks in advance,

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• System freezes while not in use, how do I fix this?

  - by PHLAK

  Bare with me, the following is a bit winded. I have Ubuntu 10.10 Desktop 64-bit installed on my laptop and up until a few weeks ago it has been running great. Then one day, while I was not using the laptop it froze. I was logged in as my user but had locked the screen locked and closed the lid. I didn't notice that it had frozen until I opened the lid and wiggled the mouse to try and log in. The screen remained black and I got no response. I immediately tried Alt + F2, F3, F4, etc. but got no response. The only thing I could do was hold the power button to power off the machine. The freezing has happened as quickly as within 10-20 minutes of the system being logged off and lid closed and as long as 4-6 hours. My machine is NOT configured to go into standby when plugged in and this has happened both on AC power and battery. Troubleshooting I have performed: I uninstalled programs I knew that I had installed between when it was working fine and having problems. Those programs were CrashPlan, Shutter and Conky. After uninstalling ALL of these programs the freezing still occurs. Next, I decided to SSH into the machine from my desktop and leave an htop and tail of the syslog running. Here are screenshots of the last thing shown on both when the system froze: htop, syslog Here is a dump of my syslog after another freeze. The freeze happened at 9:14 and I didn't notice it until about 10 minutes later and rebooted, hence the 10 minute gap from 9:14 to 9:24. In the above syslog dump I noticed a lot of NVRM: os_raise_smp_barrier(), invalid context! and upon investigating that message learned it was from the proprietary Nvidia driver I had installed. Thinking this could be part of the problem I uninstalled the Nvidia driver and reverted to using the Nouveau driver. The computer still froze after a few hours. Lastly, thinking the problem could be caused by overheating I used compressed air to blow out any dust in the CPU vents and all other openings on the laptop. None of the above troubleshooting has helped and the freezing still occurs. What other steps can I take to troubleshoot and/or fix this problem? Note: Yesterday X started to eat up a lot of CPU power and eventually froze my system while I was forwarding an X session over SSH (from another PC to my laptop). I'm unsure if this is related or not as it doesn't match any of the symptoms of the problem above. Aside from this, the system has never frozen while in use, even under heavy load. EDIT: I just ran Memtest86+ and it made it through two passes without any errors. Just eliminating possible causes here.

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• Error encountered compiling kernel 2.6.35-25.44

  - by Matt

  I downloaded the linux-source-2.6.35 package and tried to compile it using the command "fakeroot make-kpkg --append-to-version=.dbg kernel_image kernel_source kernel_headers --initrd" after "make menuconfig". The image .deb file is produced and installs fine, but an error stops the build process while trying to make the source package: scripts/Makefile.clean:17: /home/ade/linux-source-2.6.35/debian/linux-source-2.6.35.10.dbg/usr/src/linux-source-2.6.35.10.dbg/crypto/Makefile: No such file or directory make[1]: *** No rule to make target `/home/ade/linux-source-2.6.35/debian/linux-source-2.6.35.10.dbg/usr/src/linux-source-2.6.35.10.dbg/crypto/Makefile'. Stop. make: *** [_clean_crypto] Error 2 Sure enough, the folder linux-source-2.6.35/debian/linux-source-2.6.35.10.dbg/usr/src/linux-source-2.6.35.10.dbg/crypto does not exist (although all of the other kernel source folders appear to be there). I haven't even been able to determine where the folder is supposed to be copied over, or what's supposed to invoke clean. Am I doing something wrong here? It should be noted that I am running 10.04.

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• Installing drivers for an ATI 6950 in Ubuntu

  - by aj.esler

  Is there any way to get ubuntu to recognise an ATI 6950? I have tried installing the proprietary ATI drivers, but these do not seem to work properly. It seems to screw up the gnome desktop, and starts booting into terminal. I'm somewhat of a linux newbie, so not really sure whats going wrong. I don't want to game on ubuntu, I just want it to recognise my dual monitor setup rather than mirroring the monitors, so any driver that does this is fine by me. It seems like the open source ATI radeon drivers will not support the 6950/6970 for some time, at least until kernel 2.6.38 is released. The card is also flashed with the 6970 firmware, not sure if this is important. I am running a 64 bit version of ubuntu, I installed ubuntu server 10.10, then installed gnome-desktop.

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• Can and should UDF be used as a hard drive format?

  - by dlamblin

  Several time recently I've seen UDF suggested as the solution to a cross platform format for a drive used on Linux, Mac OS X and Windows XP and above. I've searched here and not found the same suggestion (most are suggesting ntfs-3g which seems to cost money and isn't preinstalled on a Mac). So my question is: how is this done right, and has anyone done this? Have you then filled up the drive and deleted some files to make space finding that everything works like a real r/w format even though it seems to have been primarily a write once format?

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• Why does Network-Manager close when it cannot bind to any connection?

  - by Agmenor

  When Network-Manager is not able to bind my Ubuntu to any connection, after a while it closes. The icon in the notification area (or indicator area) disappears, and it does not run any more. For instance this happens when there is really no ethernet network nor wireless one. Nonetheless this is a problem, since I often plug in my ethernet cable long after having booted my computer. As a hack I therefore hit Alt + F2, and type nm-applet. But I am not satisfied with this solution, because I think it is not intuitive enough. Is there a way to keep Network-Manager always running? I have Network-Manager 0.8.1 on Ubuntu 10.10, but this has been so for a long time, at least for one year.

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• ubiquity "hangs" after hitting first "forward" button

  - by bumbling fool

  I've been trying to install Ubuntu but, no matter what I try (wifi connected, wifi not connected, disk blank, disk prepartitioned...), it just "hangs" at the first window (pick your language) with a non-stop hourglass after hitting "forward". This is on a Stinkpad T42. Shouldn't ubiquity at least tell me what's going on? I tried to find a log but /var/log/installer* isn't present. Initiating ubiquity from command line doesn't provide any debug info either. Even when using --debug or other combinations.

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• Sub Domain tracking with Analytics filters

  - by Nick

  Hi All, We currently have Analytics tracking codes running throughout our site including our Sub Domains. What I would like to do is create different Profiles under the same account segmenting the sub domains by means of filters. Currently I am just excluding the hostname of the main website by using the following custom filter: Exclude: Hostname Filter pattern: ^www.mydomain.co.za(.*) I know this isn't the proper method of doing this though and have some of the main domains links coming through in the data. Ideally I would just like to include anything from: sub.domain.co.za Any help would be greatly appreciated. Thanks

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• CSS Intelligent Merger

  - by BHare

  I am looking for a tool very similar to http://www.tothepc.com/archives/combine-merge-multiple-css-files/ However, given this example: test1.css: #admin { background: #c9d2dc; border-color: #ccc } test2.css: #admin { background: #222; border-bottom: 1px solid #444; border-left: 1px solid #444; padding: 2px; position: fixed; right: 0px; top: 0px; width: 120px; z-index: 2 } It will only allow you to select one or the other. I want to merge them, making it: #admin { background: #c9d2dc; border-color: #ccc border-bottom: 1px solid #444; border-left: 1px solid #444; padding: 2px; position: fixed; right: 0px; top: 0px; width: 120px; z-index: 2 }

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• general questions about link spam

  - by hen3ry

  Hello, A CMS-based site I manage is suffering from a small but ominously growing number of almost certainly bot-emplaced, invisible spam links placed in registered-user-only shoutboxes and user forums. "Link Spam", yes? Until recently, I've kept my eyes on narrow tech issues, and I'm having trouble understanding what's going on. I understand that we need to tighten up our registration procedures, but more generally... Do I understand correctly that our primary interest in combatting link spam on our site is that major search engines reduce or zero the search visibility of sites that contain link spam? Although we're non-commercial, we don't want to be at the bottom of the rankings, or eliminated altogether. Are the linked-to sites the direct beneficiaries of the spam links, or is there some kind of indirection? What is the likely relationship between the link-spammers and the owners of the (directly or indirectly) linked-to sites? Are the owners of the linked-to sites paying the link-spammers for higher visibility? Are the owners aware that this method is being used? It is my impression that major search engines are capable these days of detecting that given sites are being promoted by link spam, and that these sites may consequently be reduced in search rank or dropped altogether. Do these sanctions occur frequently? Is there any potential value in sending notifications to the owners of the linked-to sites that their visibility is at risk? TIA, hen3ry

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• django & postgres linux hosting (with SSH access) recommendations

  - by Justin Grant

  We're looking for a good place to host our custom Django app (a fork of OSQA) and its postgresql backend. Requirements include: Linux Python 2.6 or (ideally) Python 2.7 Django 1.2 Postgres 8.4 or later DB backup/restore handled by the hoster, not us OS & dev-platform-stack patching/maintenance handled by the hoster, not us SSH access (so we can pull source code from GitHub, so we can install python eggs, etc.) ability to set up cron jobs (e.g. to send out dail email updates) ability to send up to 10K emails/day good performance (not ganged up with a zillion other sites on one CPU, not starved for RAM) FTP or SCP access to web logs dedicated public IP SSL support Costs under $1000/month for a relatively small site (<5M pageviews/month) Good customer service We already have a prototype site running on EC2 on top of a Bitnami DjangoStack. The problem is that we have to patch the OS, patch postgres, etc. We'd really prefer a platform-as-a-service (PaaS) offering, like Heroku offers for Rails apps, where all we need to worry about is deploying our code instead of worrying about system software patching and maintenance. Google App Engine is closest to what we're looking for, but they don't offer relational DB access (not yet at least). Anyone have a recommendation?

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• How to pay for servers without ads ?

  - by Matthieu

  Hi everyone ! I have a website whose goal is to provide a free educational service (like wikipedia does, not on the same scale obviously). I wonder how I will continue to pay for the servers when I reach high traffic. I don't want to use any ads or sponsor things, because this is not the goal of the website (just like wikipedia once again). Does "please donate" works ? If no, is there any alternative to a "private/premium not free" part in the website ? Thanks

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• Online job application

  - by Fred

  I am trying to add an application to my site where I can post job openings with my company and allow people to apply online. Can someone recommend a service or app already in existence for this purpose? I tried googling it, but could not find a set of search terms that did not return endless sites for job seekers. This is a (very) small business and I do not expect to have more than a few openings at any time, but what I am actually interested in is having a repository of interested job seekers to have on file. Then when people ask me about openings, I could just refer them to the page and they could apply. Then, if we have an opening, we could look through the list of candidates and if we can't fill the position(s) from that list, we could post the job and advertise to fill the position.

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• How can I call a URL as a cron job in Webmin?

  - by EmmyS

  (Possibly this belongs on stackoverflow, although it's not really a programming issue since the code works when run directly. If it needs to be moved, though, no problem.) I have a PHP file (which consumers a National Weather Service web service via SOAP, if it matters) that I need to run on a scheduled basis. I'm trying to set up a cron job in Webmin. If I use an absolute path to the file in the Command field, when I run it I get some strange errors: /var/www/html/mysite.com/test/ndfdXMLclient.php: line 1: ?php: No such file or directory /var/www/html/mysite.com/test/ndfdXMLclient.php: line 2: //: is a directory /var/www/html/mysite.com/test/ndfdXMLclient.php: line 3: //DOCUMENTATION: No such file or directory /var/www/html/mysite.com/test/ndfdXMLclient.php: line 4: //: is a directory /var/www/html/mysite.com/test/ndfdXMLclient.php: line 5: syntax error near unexpected token `"running client code",' /var/www/html/mysite.com/test/ndfdXMLclient.php: line 5: `error_log("running client code", 1, "[email protected]");' The actual code in my file for those 5 lines looks like this: <?php // *************************************************************************** //DOCUMENTATION FROM WEATHER.GOV ALL STORED IN xmlClientComments.txt // *************************************************************************** error_log("running client code", 1, "[email protected]"); The code runs perfectly fine when I run it directly in my browser, so why doesn't webmin recognize it as code? (The same thing happens if I enter the actual URL in the command field - http://mysite.com/test/ndfdXMLclient.php.) I've never worked with webmin before; most of our hosts' cron control panels allow cron jobs to run PHP files like this with no issue. Is there some trick to getting webmin to read php as actual php?

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• Reusable skill class structure

  - by Martino Wullems

  Hello, Pretty new to the whole game development scene, but I have experience in other branches of programming. Anyway, I was wondering what methods are used to implement a skill structure. I imagine a skill in itself would a class. I'm using actionscript 3 for this project btw. public class Skill { public var power:int; public var delay:int; public var cooldown:int; public function Attack(user:Mob, target:Mob) { } } } Each skill would extend the Skill class and add it's own functionality. public class Tackle extends Skill { public function Tackle(user:Mob, target:Mob) { super(user, target); executeAttack(); } private function executeAttack():void { //multiply user.strength with power etc //play attack animation } } } This where I get stuck. How do I termine which mobs has which skills? And which skill will they later be able to retrieve (by reaching a certain level etc). How does the player actually execute the skill and how is it determine if it hits. It's all very new to me so I have no idea where to begin. Any links would also be appreciated. Thanks in advance.

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• Approximating walking physics via simpler sliding physics

  - by Dave

  I am modeling walking insects. I implement them as cuboids and use forces (including friction and drag), to control motion. However, the movement characteristics of this 'sliding box' physics don't match those due to a legged creature. For example, legged creatures near-instantly accelerate to their top speed; whereas applying a force to a box takes time to accelerate it. The applied force can be increased along with the counteracting drag, giving much quicker acceleration (via force) to a max speed (via drag). However, this also means the force that creatures can exert when pushing on other objects is increased. Does anyone know of any techniques using a physics engine to cheaply model walking creatures?

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• STL for games, yea or nay?

  - by munificent

  Every programming language has its standard library of containers, algorithms, and other helpful stuff. With languages like C#, Java, and Python, it's practically inconceivable to use the language without its standard lib. Yet, on many C++ games I've worked on, we either didn't use the STL at all, used a tiny fraction of it, or used our own implementation. It's hard to tell if that was a sound decision for our games, or one simply made out of ignorance of the STL. So... is the STL a good fit or not?

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• Why don't C++ Game Developers use the boost library?

  - by James

  So if you spend any time viewing / answering questions over on Stack Overflow under the C++ tag, you will quickly notice that just about everybody uses the boost library; some would even say that if you aren't using it, you're not writing "real' C++ (I disagree, but that's not the point). But then there is the game industry, which is well known for using C++ and not using boost. I can't help but wonder why that is. I don't care to use boost because I write games (now) as a hobby, and part of that hobby is implementing what I need when I am able to and using off-the-shelf libraries when I can't. But that is just me. Why don't game developers, in general, use the boost library? Is it performance or memory concerns? Style? Something Else? I was about to ask this on stack overflow, but I figured the question is better asked here. EDIT : I realize I can't speak for all game programmers and I haven't seen all game projects, so I can't say game developers never use boost; this is simply my experience. Allow me to edit my question to also ask, if you do use boost, why did you choose to use it?

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