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  • Output of free -m on a Linux server

    - by cat pants
    I can see from this page here: http://www.linuxatemyram.com/ That the correct amount of free ram is on the "-/+ buffers/cache" line. The extra ram being used is for disk caching. However, I noticed that the total amount of memory used listed in "-/+ buffers/cache" line is significantly less than the sum total of the "RES" column of the processes shown in top. And AFAIK, the "RES" column is how much physical memory is being used by a process. How do you explain this discrepancy?

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  • Linux virtualized screen resolution

    - by vladev
    Hopefully there is a positive answer to this question: I have a 15.4" laptop with native screen resolution of 1920x1200. You can imagine that everything is completely unreadable by default. If I increase the font size it becomes readable, but ugly. Is it possible to set the "real" resolution to 1920x1200 so it plays nice with the monitor, but set some "virtual" resolution of 1440x900 so that everything starts looking nice. Note: If I just change the resolution to 1440x900 everything becomes blurry, since this is not the monitor's default resolution. I know that having a small monitor with high resolution is not very optimal - not my choice. (Using nvidia GF8400M)

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  • How to autostart service in ANY linux?

    - by user329115
    I need to install the dumbest possible service (a binary) and have it reliably run as the current user at boot (or login, whatever) at as many platforms as possible (of the aging point-of-sale type). The app monitors another archives generated by another app in the user-session. Startup alternatives considered: init.d @reboot in crontab a .desktop file in ~/.config/autostart a myriad of other solutions including .profile and .bashrc All of the above break down at some point. The problems stem from not wanting to run as root (I want the files generated to be user-accessible), and not having a way to reliably get the current user name in sudo on all platforms. Ideally not even sudo can be assumed available. Hey, I just want to run something on boot and I have "root" power to do so. Windows get the job done easily enough. This isn't rocket science, is it?

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  • Mimicing Mac-style command/alt/control keys in Linux

    - by Kenrick Rilee
    I absolutely love that Mac separates the command key from the control key, allowing OS shortcuts and text shortcuts to co-exist. It's incredibly useful, especially because it allows emacs shortcuts everywhere. I've searched almost everywhere for some kind of utility that can allow this and can't find anything. Any help? Note: I want to do more than just remap my keyboard. I want to actually split OS shortcuts and text shortcuts. The only way I can see doing that is to manually go through each shortcut in Gnome and Compiz and change it.

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  • Linux Server partitioning

    - by user1717735
    There's a lot of infos about this out there, but there's also a lot of contradictory infos… That's why i need some advices about it. So far, on the servers i had home for test (or even "home production") purposes i didn't really care about partitioning and i configured all in / + a swap partition, over RAID 0. Nevertheless, this pattern can't apply to production servers. I have found a good starting point here, but also it depends on what the servers will be used for… So basically, i have a server on which there will be apache, php, mysql. It will have to handle file uploads (up to 2GB) and has 2*2TB hard drive. I plan to set : / 100GB, /var 1000GB (apache files and mysql files will be here), /tmp 800GB (handles the php tmp file) /home 96GB swap 4GB All of this if of course over RAID 1. But actually, it's not a big deal if I lose data being uploaded, so would it be interesting mounting /tmp over raid 0 while maintaining the rest over raid 1? Sounds complicated…

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  • Seg Fault when using std::string on an embedded Linux platform

    - by Brad
    Hi, I have been working for a couple of days on a problem with my application running on an embedded Arm Linux platform. Unfortunately the platform precludes me from using any of the usual useful tools for finding the exact issue. When the same code is run on the PC running Linux, I get no such error. In the sample below, I can reliably reproduce the problem by uncommenting the string, list or vector lines. Leaving them commented results in the application running to completion. I expect that something is corrupting the heap, but I cannot see what? The program will run for a few seconds before giving a segmentation fault. The code is compiled using a arm-linux cross compiler: arm-linux-g++ -Wall -otest fault.cpp -ldl -lpthread arm-linux-strip test Any ideas greatly appreciated. #include <stdio.h> #include <vector> #include <list> #include <string> using namespace std; ///////////////////////////////////////////////////////////////////////////// class TestSeg { static pthread_mutex_t _logLock; public: TestSeg() { } ~TestSeg() { } static void* TestThread( void *arg ) { int i = 0; while ( i++ < 10000 ) { printf( "%d\n", i ); WriteBad( "Function" ); } pthread_exit( NULL ); } static void WriteBad( const char* sFunction ) { pthread_mutex_lock( &_logLock ); printf( "%s\n", sFunction ); //string sKiller; // <----------------------------------Bad //list<char> killer; // <----------------------------------Bad //vector<char> killer; // <----------------------------------Bad pthread_mutex_unlock( &_logLock ); return; } void RunTest() { int threads = 100; pthread_t _rx_thread[threads]; for ( int i = 0 ; i < threads ; i++ ) { pthread_create( &_rx_thread[i], NULL, TestThread, NULL ); } for ( int i = 0 ; i < threads ; i++ ) { pthread_join( _rx_thread[i], NULL ); } } }; pthread_mutex_t TestSeg::_logLock = PTHREAD_MUTEX_INITIALIZER; int main( int argc, char *argv[] ) { TestSeg seg; seg.RunTest(); pthread_exit( NULL ); }

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  • wopen calls when porting to Linux

    - by laura
    I have an application which was developed under Windows, but for gcc. The code is mostly OS-independent, with very few classes which are Windows specific because a Linux port was always regarded as necessary. The API, especially that which gets called as a direct result of user interaction, is using wide char arrays instead of char arrays (as a side note, I cannot change the API itself - at this point, std::wstring cannot be used). These are considered as encoded in UTF-16. In some places, the code opens files, mostly using the windows-specific _wopen function call. The problem with this is there is no wopen-like substitute for Linux because Linux "only deals with bytes". The question is: how do I port this code ? What if I wanted to open a file with the name "something™.log", how would I go about doing so in Linux ? Is a cast to char* sufficient, would the wide chars be picked up automatically based on the locale (probably not) ? Do I need to convert manually ? I'm a bit confused regarding this, perhaps someone could point me to some documentation regarding the matter.

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  • Programming Environment for a Motorola 68000 in Linux

    - by Nick Presta
    Greetings all, I am taking a Structure and Application of Microcomputers course this semester and we're programming with the Motorola 68000 series CPU/board. The course syllabus suggests running something like Easy68K or Teesside Motorola 68000 Assembler/Emulator at home to test our programs. I told my prof I run x64 Linux and asked what sort of environment I would need to complete my coursework. He said that the easiest environment to use is a Windows XP 32bit VM with one of the two suggested applications installed, however, he doesn't really care what I use as long as I can test what I write at home. So I'm asking if there exists some sort of emulator or environment for Linux so I can test my code, and what sort of caveats I will run into by writing and testing my code in Linux. Also, I plan to do my editing in Vim, which probably isn't a problem, but I would like any insight into editors for 68000 assembly, if you have any. Thanks! EDIT: Just to clarify - I don't want to install Linux on the board at all - I want to program on my home machine, test the code locally, and then bring it onto the board for grading/running.

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  • C++: Code assistance in Netbeans on Linux

    - by Martijn Courteaux
    Hi, My IDE (NetBeans) thinks this is wrong code, but it compiles correct: std::cout << "i = " << i << std::endl; std::cout << add(5, 7) << std::endl; std::string test = "Boe"; std::cout << test << std::endl; He always says: unable to resolve identifier .... (.... = cout, endl, string); So I think it has something to do with the code assistance. I think I have to change/add/remove some folders. Currently, I have this include folders: C compiler: /usr/local/include /usr/lib/gcc/i486-linux-gnu/4.4.3/include /usr/lib/gcc/i486-linux-gnu/4.4.3/include-fixed /usr/include C++ compiler: /usr/include/c++/4.4.3 /usr/include/c++/4.4.3/i486-linux-gnu /usr/include/c++/4.4.3/backward /usr/local/include /usr/lib/gcc/i486-linux-gnu/4.4.3/include /usr/include Thanks

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  • C++: IDE Code assistance (Linux)

    - by Martijn Courteaux
    Hi, My IDE (NetBeans) thinks this is wrong code, but it compiles correct: std::cout << "i = " << i << std::endl; std::cout << add(5, 7) << std::endl; std::string test = "Boe"; std::cout << test << std::endl; He always says: unable to resolve identifier .... (.... = cout, endl, string); So I think it has something to do with the code assistance. I think I have to change/add/remove some folders. Currently, I have this include folders: C compiler: /usr/local/include /usr/lib/gcc/i486-linux-gnu/4.4.3/include /usr/lib/gcc/i486-linux-gnu/4.4.3/include-fixed /usr/include C++ compiler: /usr/include/c++/4.4.3 /usr/include/c++/4.4.3/i486-linux-gnu /usr/include/c++/4.4.3/backward /usr/local/include /usr/lib/gcc/i486-linux-gnu/4.4.3/include /usr/include Thanks

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  • Quick introduction to Linux needed [closed]

    - by 0xDEAD BEEF
    Hi guys! I have to get into Linux ASAP and realy mean ASAP. I have installed Cygwin but as allways - things dont go as easy as one would like. First problem i enconter was - i choose KDE package, but there is no sign of KDE files anywhere in cygwin folder. How do i run KDE windows. Currently startx fires, but all looks ugly! My desire is to download and run Qt Creator. Seems that there is no cygwin package, but downloading source and compiling is good to go. Only that i have forgoten every linux command i ever knew! :D Please - what are default commands u use on linux? What does exec do? what ./ stands for? What is directory strucutre and why there is such mess in bin folder? Thanks god - i have windows over cygwin, so downloading files is not a problem, but again -how do i unpack them in linux style and how to i build? simply issue "make" command from folder, where i extracted files? Please help!

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  • Is it possible to execute keyboard input programmatically in Linux?

    - by Taylor Hawkes
    For example is there a Linux command or way that I could from a program (c++ | python| or other) enter a series of keyboard inputs that are interpreted as though they are keyboard inputs. I have a bad case of Repetitive Stress Injury (RSI) from typing. To ease my pain I developed a voice controlled interface using pocket sphinx and a custom grammar and to run a number of very common commands. ex: "open chrome" , "open vim". Basically what is shown here, but with slightly diff tools: http://bloc.eurion.net/archives/2008/writing-a-command-and-control-application-with-voice-recognition/ I have run into some limitation as I can only execute command line commands given a voice command. Rather than having a "voice command" - "command line command" mapping, I would like to have "voice command" - "keyboard input" mapping. So when my active window is a browser and I type + n, and new tab opens. If I'm in vim and new vim tab opens. Any suggestions, ideas, tools or approaches to this problem would be much appreciated. I understand the answer may not be simple, but would like to develop it none the less.

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  • is it possible to execute keyboard input programmaticly in linux?

    - by Taylor Hawkes
    For example is there a Linux command or way that I could from a program (c++ | python| or other) enter a serious of keyboard inputs that are interpreted as though they are keyboard inputs. I have a bad case of RSI from typing. To ease my pain I developed a voice controlled interface using pocket sphinx and a custom grammar and to run a number of very common commands. ex: "open chrome" , "open vim". basically what is shown here, but with slightly diff tools: http://bloc.eurion.net/archives/2008/writing-a-command-and-control-application-with-voice-recognition/ I have run into some limitation as I can only execute command line commands given a voice command. Rather than having a "voice command" - "command line command" mapping I would like to have "voice command" - "keyboard input" mapping. So when my active window is a browser and i type + n, and new tab opens. If i'm in vim and new vim tab opens. Any suggestions, ideas, tools or approaches to this problem would be much appreciated. I understand the answer may not be simple, but would like to develop it none the less.

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  • Reminder: Oracle Linux 5 Exams Soon To Retire

    - by Brandye Barrington
    This is a reminder that Oracle will retire Oracle Linux System Administration (1Z0-403) and Oracle Linux Fundamentals (1Z0-402) on October 31, 2013. We will also re-release exam 1Z0-402 as Oracle Linux Fundamentals (1Z0-409) on November 1, 2013. New Oracle Linux 5 and 6 OCA and OCP certifications are now available. Existing certification holders should note that these retirements suspend the delivery of any further exams, but do not affect your certification. If you currently hold a certification earned by one of these exams, your credential remains fully valid. Retiring Certification Path Oracle Linux Administrator Certified Associate Retiring Exam 1Z0-402 Oracle Linux Fundamentals (this will be re-released as Oracle Linux Fundamentals (1Z0-409) and lead to the  Oracle Linux Certified Implementation Specialist certification.) 1Z0-403 Oracle Linux System Administration These exams will continue to be offered through October 31, 2013. Candidates pursuing these certification paths must successfully complete the required certification exams by this date. Re-takes will not be available after this date. For more information, see Oracle Certification retirements. For more information on the new exams and certifications, see the Oracle Certification Blog.

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  • Architectural approaches to creating a game menu/shell overlay on PC/Linux?

    - by Ghopper21
    I'm am working on a collection of games for a custom digital tabletop installation (similar to Microsoft Surface tables). Each game will be an individual executable that runs full-screen. In addition, there needs to be a menu/shell overlay program running simultaneously. The menu/shell will allow users to pause games, switch to other games, check their game history, etc. Some key requirements of the shell: it intercepts all user input (mainly multitouch) first before passing it on to the currently running game (so that it can, for instance, know to pop-up at a "pause" command); can reveal on arbitrary portions of the screen, with the currently running (but presumably paused) game still showing underneath, ideally with its shape/size being dynamic, to allow for creation of an animated in/out drawer effect over the game. I'm currently looking into different architectural approaches to this problem, including Fraps and DirectX overlays, but I'm sure I'm missing some ways to think about this. What are the main approaches I should be considering? (Note the table is currently being run by Windows PC, but it could potentially be a Linux box instead.)

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  • Linux, GNU GCC, ld, version scripts and the ELF binary format -- How does it work? [closed]

    - by themoondothshine
    I'm trying to learn more about library versioning in Linux and how to put it all to work. Here's the context: I have two versions of a dynamic library which expose the same set of interfaces, say libsome1.so and libsome2.so. An application is linked against libsome1.so. This application uses libdl.so to dynamically load another module, say libmagic.so. Now libmagic.so is linked against libsome2.so. Obviously, without using linker scripts to hide symbols in libmagic.so, at run-time all calls to interfaces in libsome2.so are resolved to libsome1.so. This can be confirmed by checking the value returned by libVersion() against the value of the macro LIB_VERSION. So I try next to compile and link libmagic.so with a linker script which hides all symbols except 3 which are defined in libmagic.so and are exported by it. This works... Or at least libVersion() and LIB_VERSION values match (and it reports version 2 not 1). However, when some data structures are serialized to disk, I noticed some corruption. In the application's directory if I delete libsome1.so and create a soft link in its place to point to libsome2.so, everything works as expected and the same corruption does not happen. I can't help but think that this may be caused due to some conflict in the run-time linker's resolution of symbols. I've tried many things, like trying to link libsome2.so so that all symbols are alised to symbol@@VER_2 (which I am still confused about because the command nm -CD libsome2.so still lists symbols as symbol and not symbol@@VER_2), but nothing seems to work. What am I doing wrong?

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  • Can Core Data be used on Linux?

    - by glenc
    This might be a stupid question, but I was wondering whether or not you can use the Core Data libraries on Linux at all? I'm planning how to build the server side of an iPhone app that I'm working on, and have found that you can use PyObjC to get access to Core Data in a Python environment, e.g. use Core Data in a TurboGears web application. At this point I'm thinking that you would have to run the web server on Mac OSX, because I can't find any evidence on the internet that you can access the Objective-C libraries on Linux. I've always written webapps on Linux but will obviously make the jump to an OSX server if it allows me to use the same datastore implementation on the iPhone and the server, the only job remaining being the Core Data <- Web Services XML translation that has to happen on the wire.

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  • Using Linux vs Windows for development

    - by Philipp Lenssen
    On my servers I run everything on Linux/ Apache, but for offline preparation before upload of the projects I'm using Windows (Vista) with a local Apache/ WAMP, PHP, Python, GD_image installation and so on. My question, would it be much easier in terms of setting up a good environment if I were to use Linux, e.g. Ubuntu distribution, as development OS for these things? Would you know some pros and cons when it comes to Windows vs Linux in terms of web development? (As I'm using mostly web apps these days, switching the OS might be less of a problem. I would need a good replacement for my image editor, though, as I prefer Corel PhotoPaint and PSP4 over Gimp, last time I tried.)

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  • Using .lib and .dll files in Linux

    - by smile
    Hi all, I have to make a project to run successfully on a Linux machine. Right now my project works very well on windows machine. On Windows machine it is compiling and working fine. My project is using one ".lib" and one ".dll" file to do the tasks successfully on Windows. Can i use the same .lib file and .dll file on linux machine to build the project successfully? I am compiling the project with G++ and using GNU Makefile to do the task. What should i do in the case that i can not use the .LIB and .DLL file on Linux machine. Thanks in advance Shivakumar.Konidela

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