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  • Encapsulate standard C functions?

    - by Jack Stout
    While studying the C programming language and learning safe practices, I'm inclined to write a layer of functionality over several parts of the standard library. This would serve two purposes: I could use standard parts of the language in ways that feel more familiar or rational to me, and I could easily replace that functionality with my own, if I needed to. I could benefit from this, but should I do it? As an example, we can consider memory management. If I've written malloc() into the constructors of each of my objects, then decide that I need to handle memory allocation on my own, I have to edit the constructor associated with every object. By referencing my own function, I can change the contents of that function without writing a new constructors. It seems obvious that I should do this, but I'm used to Python. I'm extremely comfortable in that environment and have no problem linking to any part of the standard library from any part of my program because I know I will almost certainly leave that relationship untouched for the life of the project. The situation I'm running into with C feels like I'm trying to hide the language from myself. Will writing a layer of functionality over the C standard library help me in learning the language and developing a codebase, or will it stifle my understanding going forward?

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  • Would upgrading memory from 4GB to 8GB on my laptop solve swapping issues?

    - by Tom
    I have a laptop with 4GB of memory with Windows 7 on it and I often experience with Eclipse that it is swapped out to disk. On the net they usually write 4GB of RAM is more than enough for average use and aside from Eclipse+Android Emulator I don't really use other extra apps, yet Eclipse is always swapped out if I haven't used it for a while (say, 1 day) and it is annoying it to wait for it to be resurrected from swap. My question is: would an upgrade to 8GB solve the issue of swapped out applications? With 8GB would windows 7 keep everything in memory? Or it wouldn't change anything and Eclipse would be swapped out regardless of the amount of memory, because Win 7 has a habit of kicking out every application from memory which hasn't be used for a while?

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  • Can a S3 mount be used as the document root for Apache?

    - by Hesse
    Has anyone been successful in having their DocumentRoot reside on an S3 mount (using s3fs)? I currently have a mounted bucket at /mnt/s3. I can read and write files to it no problem. In my httpd.conf I have DocumentRoot "/mnt/s3". When I restart Apache I get the error "DocumentRoot must be a directory". Has anyone tried something similar. My goal is to have a shared storage space so my nodes can scale easily and access the same document root. Thanks

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  • Monitor Windows Terminal Sessions from Linux/Mac

    - by mhd
    I'm writing some scripts to make remote connections to a Windows 2003 server a bit more user-friendly, and in doing this I want to see who's logged in already. In Windows, I could use qwinsta.exe to do this, even for remote servers. So it is exposed somehow, but I couldn't find a matching command line tool for Unix. Lacking such a tool, I could install an ssh server on the machine and call it remotely, parsing the output or write a small service of my own that would expose this via http, if I don't want full-blown ssh access. Do I have to do this, or is there already a tool for querying terminal services remotely?

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  • gunzip unexpected end of file

    - by Mark J Seger
    I like to write high volume data directly to a zip file via perl. Works like a champ! However, on some rare occasions I've found that gunzip can't uncompress them declaring an unexpected end-of-file. The thing is I can uncompress it with a simple perl script, which probably misses the corrupted record(s) at the end. My question is, does anyone know of a way to use a standard utility to do the same thing? Maybe with a 'compress-as-much-as-you-can' switch? -mark

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  • searchd under runit continues writing to the runit's log

    - by Eugene
    searchd (Sphinx) run file: #!/bin/sh set -e APP_PATH=/srv/application TARGET_USER=user exec chpst -u $TARGET_USER /usr/bin/searchd --pidfile --nodetach --config $APP_PATH/current/config/production.sphinx.conf tail /var/log/sphinx/current 2014-06-07_18:13:56.87885 precached 9 indexes in 0.497 sec 2014-06-07_18:13:57.13740 precached 9 indexes in 0.497 sec 2014-06-07_18:13:57.88113 precached 9 indexes in 0.497 sec 2014-06-07_18:13:57.89167 precached 9 indexes in 0.497 sec 2014-06-07_18:13:59.75555 precached 9 indexes in 0.497 sec 2014-06-07_18:13:59.81554 precached 9 indexes in 0.497 sec 2014-06-07_18:14:00.33466 precached 9 indexes in 0.497 sec ... it continues to write the same line until sv stop sphinx ... Everything works fine, seachd starts and responds to the queries. But how to make logs to be less repetitive? When I start Sphinx manually it prints the "precached 9 indexes" just once.

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  • Access Control Service: Walkthrough Videos of Web Application, SOAP, REST and Silverlight Integration

    - by Your DisplayName here!
    Over the weekend I worked a little more on my ACS2 sample. Instead of writing it all down, I decided to quickly record four short videos that cover the relevant features and code. Have fun ;) Part 1 – Overview This video does a quick walkthrough of the solution and shows the web application part. This includes driving the sign in UI via JavaScript (thanks Matias) as well as the registration logic I wrote about here. watch Part 2 – SOAP Service and Client The sample app also exposes a WCF SOAP service. This video shows how to wire up the service to ACS and hows how to create a client that first requests a token from an IdP and then sends this token to ACS. watch Part 3 – REST Service and Client This part shows how to set up a WCF REST service that consumes SWT tokens from ACS. Unfortunately there is currently no standard WIF plumbing for REST. For the service integration I had to combine a lot of code from different sources (kzu, zulfiq) as well as the WIF SDK and OAuth CTPs together. But it is working. watch Part 4 – Silverlight and Web Identity Integration This part took by far the most time to write. The Silverlight Client shows ho to sign in to the application using a registered identity provider (including web identities) and using the resulting SWT token to call our REST service. This is designed to be a desktop (OOB) client application (thanks to Jörg for the UI magic). watch code download

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  • Windows network: deny file access to another user if file is currently open

    - by Steve
    Some users on my network are having difficulties saving files, because the file is open elsewhere. Let's say Lemuel wants to edit a file, but Bernice in the next office over is working on it. Lemuel opens, edits, and tries to save, but then gets a "no write access" error. Bernice chortles with glee (since earlier that week Lemuel stole her sandwich). Unfortunately, various softwares will not warn the user that they have opened a read-only file. Is there a way (in Windows) to limit file access to ONE user only, i.e. 777 for the first user to open the file, and 000 for all users after that? (Sorry for the Linux terminology but it gets my point across).

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  • Java login through LDAP

    - by Salda
    I am starting to write an application for our office and the first step is authentication through LDAP where all users already exist. Everything I need is a code in Java to check if the pair <nick,password> is right. Google found me many links, but I think that I will find here the most sofisticate, short and up to date solution (I don't want to read all articles like 2 whole days to do something so simple). I have written many dkBs of code in C++, but in Java I am total noob and I haven't coded anything with LDAP yet so try to be simple if speaking in Java and LDAP terms if possible.

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  • Artists and music - Need Help Deciding on a CMS

    - by infty
    A friend has asked me to build a site with the following options: staff members must be able to add new music and artists to the page a gallery must be provided - it is also good if each artist has the ability to have his/her own smaller gallery users must be able to vote for artists users must be able to alter in discussions (forums or comments sections) staff members must be able to blog staff members must be able to write articles I did a small project where i actually implemented all of these features, but I want to use an existing content management system for all of these features so that future developers can, hopefully, more easy extend the website. And also, so that I don't have to provide too much documentation. I have never developed a website using an external CMS like Drupal or Wordpress and after seeing hours of tutorial videos of both systems, I still can't make up my mind on whether i should : a) use Drupal 7 b) use Wordpress 3 c) create my own cms I can imagine that staff members would also want to create content using iPhone or android based mobile devices, but this is not a required feature. Can someone, with experience, please tell me about their experiences with larger projects like this? The site will have approximately 400 000 - 500 000 visitors (not daily visitors, based on numbers from last year in a period of 4 months)

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  • Choosing the Database Solution for Large Data Application

    - by GµårÐïåñ
    I have been tasked to write an application that will be a combination of document and inventory management in VB.net which will be used to store document images in TIFF, PDF, XPS, TXT, DOC, PPT and so on as binary data that can be retrieved for viewing, printing, and possible OCR to be searchable as well along with meta data such as sender, recipient, type of document, date, source, etc. So the table would probably be something like: DOC_NAME, DOC_DATE, NOTES, ... DOC_BINARY (where the actual document will be put inside) What my concern is finding a database solution that will not become unstable due to size restrictions, records limitations and performance. Some of the options are MS_SQL, SQL Express, SQLite, mySQL, and Access. Now I can pretty much eliminate Access right off the bat as it is just too limiting and not scalable. I can further eliminate SQL Express because of the 2 GB limit and again scalability. So that leaves me with MS_SQL, SQLite and mySQL (although if anyone has other options they think would be good as well, please feel free to share them, by no means am I set on these only). So this brings me to what you guys think is the best option for what I have described. The goal is that the data is all in one place (a single file) that will make backup and portability easier. For small volume usage, pretty much any solution will hold for a while, but my goal is to think ahead and make sure its able to withstand heavy large volume usage as well. Another consideration is also the interoperability with .NET and stability of such code to avoid errors and memory leaks. Your feedback would be greatly appreciated.

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  • Conflicts with MS Office temporary files when using Offline Folders on Vista

    - by Tambet
    We are using Offline Folders feature of Windows Vista to make files on network shares available when out of office. Mostly it is working, but every time I do a sync I get a lot of such errors: D500E7B8.tmp - A file was deleted on this computer and changed on the server while this computer was offline. There are hundreds of them. I always select all of them and choose resolution "Delete from both locations". But what is causing this and how can I avoid it? I suspect the reason is that we are using Debian and Samba (3.4.7) on our file server. I've been looking for some Samba options that would cure this, but with no success. I learned that probably the cause is, that both Word and Excel are using specific pattern to change files - they never change the original file, but instead always write a new temporary file and rename it to original file, when you click Save. This is documented here: http://support.microsoft.com/kb/211632/?FR=1.

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  • Guidelines for creating referentially transparent callables

    - by max
    In some cases, I want to use referentially transparent callables while coding in Python. My goals are to help with handling concurrency, memoization, unit testing, and verification of code correctness. I want to write down clear rules for myself and other developers to follow that would ensure referential transparency. I don't mind that Python won't enforce any rules - we trust ourselves to follow them. Note that we never modify functions or methods in place (i.e., by hacking into the bytecode). Would the following make sense? A callable object c of class C will be referentially transparent if: Whenever the returned value of c(...) depends on any instance attributes, global variables, or disk files, such attributes, variables, and files must not change for the duration of the program execution; the only exception is that instance attributes may be changed during instance initialization. When c(...) is executed, no modifications to the program state occur that may affect the behavior of any object accessed through its "public interface" (as defined by us). If we don't put any restrictions on what "public interface" includes, then rule #2 becomes: When c(...) is executed, no objects are modified that are visible outside the scope of c.__call__. Note: I unsuccessfully tried to ask this question on SO, but I'm hoping it's more appropriate to this site.

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  • Ubuntu live cd : black screen and blinking cursor

    - by IFasel
    I try to install ubuntu 12.04 on my computer. I can get to the purple screen on the live cd but then, if I choose "Installing Ubuntu", I have a black screen with a cursor blinking (and nothing else happens). My PC : acer aspire M3920, CPU i5-2300, 8 Gb RAM, NVIDIA gt 405. What I already tried : I tried with 12.04 and 13.04 daily build I tried with a live usb and with a live dvd I tried the following boot options : nomodset, acpi=off I googled a lot and it seems that it could be a graphic card problem. Do you know any other boot options that I could try ? UPDATE This is not a duplicate : I've tried all the common boot options (nomodeset, noacpi...) and it doesn't change anything. With the option "no splash" (instead of "quiet splash"), I can see what happens before the forever-blinking cursor : [sdg] no caching mode present [sdg] assuming drive cache : write trough ata8.00: excetion Emask 0x52 ... frozen ata8 : SError : { RecovData RecovComm UnrecovData...} ata8.00 : failed command : IDENTIFY PACKET DEVICE ... ata8.00 : status : { DRDY } ata8 : hard resetting link Does somebody know what it means ? N.B. astonishingly, Puppy Linux boots fine (but Debian, Fedora and Ubuntu do not) Solution In fact, it was not a graphic card problem. I had to disconnect the dvd drive and connect it to another free sata connector (I don't really understand why Ubuntu had trouble with this connector and Windows 7 not). After that, everything worked fine.

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  • PHP session files have permissions of 000 - They're unusable

    - by vanced
    I kept having issues with a Document Management System I'm trying to install as, at the first step of the installation process, it would error with: Warning: Unknown: open(/tmp/sess_d39cac7f80834b2ee069d0c867ac169c, O_RDWR) failed: Permission denied (13) in Unknown on line 0 Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0 I looked in /tmp and saw the sess_* files have the following permissions ---------- 1 vanced vanced 1240 Jan 20 08:48 sess_d39cac7f80834b2ee069d0c867ac169c All the session files look like this. So obviously, they're unusable by PHP and it's causing me lots of problems. How can I get PHP to set the correct permissions? I've tried changing the directory which php.ini uses to /tmp/phpsessions and the same thing occurs. The directories are a+rwx.

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  • External Hard Disk's secter could not be read ?

    - by mgpyone
    I've an 500 GB Seagate External Hard Disk (NTFS) . Currently, I can't open it at Windows. Thus, I've tired with chkdsk command .. but still it stopped and can't continue checking disk.. Also I've tired with fsck on Mac . Then, it shows me the Error .. /Volumes/<HD Name>/ is not a character device CONTINUE? yes /Volumes/<HD Name>/ (NO WRITE) CANNOT READ: BLK 16 CONTINUE? yes THE FOLLOWING DISK SECTORS COULD NOT BE READ: 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, ioctl (GCINFO): Inappropriate ioctl for device fsck: /Volumes/<HD Name>/: can't read disk label The volume I've used is around 300 GB , Thus, it's hard to back up and format again . Thus, any helpful suggestions and solutions will be appreciated pretty well.

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  • Sound plays on headphones and speakers with Lenovo ThinkPad L512 + Ubuntu 10

    - by Oscar Godson
    The only thing really missing from this install is this issue with the sound. I've searched all over the forums and i found one thing where you get the model and codecs and write them to a file, however, I can't seem to find what my "model" is because none of the postings have anything about Lenovo laptops. Here is the command they all asked for: Code: cat /proc/asound/card0/codec#* | grep Codec Codec: Realtek ALC269 Codec: Intel G45 DEVIBX With that info, how do I get the model, and how do I get my speakers to stop playing when headphones are plugged in. Also, I don't have any software installed like pulse audio either, so it's not that. Thanks so much to whoever can answer this... The Ubuntu forums are nearly useless... ive never gotten a correct answer back on that site.

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  • What would prevent a .BAT file from being run on a mapped drive?

    - by JBurace
    In WinXP SP3, I have a .BAT file on a mapped drive. When I try to run this .BAT file (or even right click-edit) it gives me: --------------------------- Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item. --------------------------- OK --------------------------- This happens with any .BAT file, no matter what is within the file. If the file is on my local computer (like C:) it will run just fine. If someone else runs it from another computer (on the same mapped drive), it runs just fine. I have full permissions on the drive; I can edit/delete/save/write/create in that folder and/or .BAT file and I've ruled out permissions being the issue. It seems like a security prevention, but I can't tell what it would be. It would have to be something on my PC, but I don't use any 3rd party software. What would cause this error?

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  • Terminal, vim and ssh color problem

    - by xaph
    I'm using vim for my editor. I've problems about the colors of vim. The same colorscheme of vim gives different outputs in terminal, ssh session and screen. I learnt they've different colors(16, 88 or 256). I don't care of using 16 color or 256 color. Also the terminal emulator is not very important to me. My questions: 1- How do I use same vim colorscheme with same output on everywhere? 2- I want to write a color definition and use it every terminal(maybe with Xdefaults file). Is it possible?

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  • How to Read XML and Generate SQL Insert

    - by hackerkatt
    I am trying to write a VB Script to read a XML file (downloaded daily) and insert the information into a MSSQL DB. The content of the XML is a list if CDRs (Call Data Records). I need to parse the file and insert the cdr's into a table. I'm a Ruby,Perl,PHP,Javascript,SQL,... programer. But I've really never written any VB Script. I've done some googling and find a number of examples on how to generate XML from a SQL Query, but not the reverse. Any help/suggestions would be greatly appreciated. Thank you!

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  • scp using a password on the command line

    - by spierepf
    I am trying to write a script that will deploy a build created on my desktop machine (windows/cygwin) to a machine in my test environment (linux). I would like to use scp to copy the build to the target machine. The only account on the target machine is root, and I cannot create a special user for this task. The root user is unable to log in using an ssh key (I suspect that this is configured on the ssh server, but I do not know which configuration options control this). At any rate, I cannot change the configuration of the ssh server. My desktop machine uses Cygwin, and I have ssh installed. What I need is the command-line-fu that will allow me to put the password on the command line. I am aware of the dangers of having a plaintext password in a shell script, but that is not a concern here.

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  • Proper way to encapsulate a Shader into different modules

    - by y7haar
    I am planning to build a Shader system which can be accessed through different components/modules in C++. Each component has its own functionality like transform-relevated stuff (handle the MVP matrix, ...), texture handler, light calculation, etc... So here's an example: I would like to display an object which has a texture and a toon shading material applied and it should be moveable. So I could write ONE shading program that handles all 3 functionalities and they are accessed through 3 different components (texture-handler, toon-shading, transform). This means I have to take care of feeding a GLSL shader with different uniforms/attributes. This implies to know all necessary uniform locations and attribute locations, that the GLSL shader owns. And it would also necessary to provide different algorithms to calculate the value for each input variable. Similar functions would be grouped together in one component. A possible way would be, to wrap all shaders in a own definition file written in JSON/XML and parse that file in C++ to get all input members and create and compile the resulting GLSL. But maybe there is another way that is not so complex? So I'm searching for a way to build a system like that, but I'm not sure yet which is the best approach.

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  • Mailing list with dynamically generated addresses

    - by Joe Tomasone
    I am trying to implement a dynamic mailing list from a database that changes quite often. Conditions: Postfix is the MTA Email addresses are in a MySql Database Postfix only allows senders whose emails are in that database (via smtpd_sender_restrictions) Cron job extracts the current emails from the database nightly and puts them into an alias file, then runs postalias on it. This works well, but since the sender remains the same, many domains are rejecting the email since my server is not a DNS listed mail server for the sender's domain. So, I either have to find a way to re-write the outgoing address as "listserv@mydomain" or find some mailing list package that will use database-retrieved emails (either queried directly or in a flat file) as the subscriber list, with that list replaced daily. I've tried Sympa and am pretty much ready to give up on it - it's a nightmare to get working right - but that's the only open source listserver that I have seen that works with dynamic mail lists. Does anyone have any ideas? Thanks, Joe

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  • PARTNER News: Tips and Guidelines from Avago (formerly LSI)

    - by Zeynep Koch
    In this blog write-up we would like to focus our attention to one of our IHV partners, Avago (formerly LSI) . Avago and Oracle have been collaborating at many levels for many years.  At the lowest level, Avago and Oracle engineer solutions to inbox advanced features in our I/O device drivers.  We collaborate to test, verify and optimize these drivers in Oracle Linux with Unbreakable Enterprise Kernel. Both LSI Nytro and Sun F-Series PCIe flash devices are supported inbox in Oracle Linux with Unbreakable Enterprise Kernel. By collaborating early in the engineering design cycle we can find and resolve issues sooner and deliver to the end-customer a fully optimized platform for I/O efficiency and data protection.  Hear more about the partnership and benefits in this podcast  LSI and Oracle Partnership. Avago had also been working on technical whitepaper and video whiteboard to explain some of the optimizations you can achieve by using smart flash cache with Oracle Linux.  Technical Paper: Improve Database Performance Using Sun Flash Accelerator Card, Database Smart Flash Cache and Oracle Linux Video: Improving DB Performance with Database Smart Flash Cache If you want more information about the partnership and product benefits, you can visit the LSI Oracle alliance page. 

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  • SSD Performance for PHP?

    - by Andrew Fashion
    My programmer just built an application with PHP using Doctrine ORM (will be a high traffic social networking website), and it's very heavy in PHP/Apache and CPU. The queries are wonderfully fast, and MySQL is barely using any CPU, it's just Apache. I was curious to if an SSD would help speed up PHP/Apache, because I know the bottleneck is in PHP reading multiple files, class files, and loading up a bunch of data. So common sense makes me think if PHP is reading multiple PHP files, an SSD would only help as far as read/write? I was thinking of doing a high performance SSD for the PHP application, but for user image uploads, I would just continue using a 15k SAS. Is there any performance issues regarding using an SSD in this kind of situation? And would it prove to help speed up PHP/Apache, and help the CPU problem out?

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