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  • Writing data over RxTx using usbserial?

    - by Jeach
    I'm using the RxTx library over usbserial on a Linux distro. The RxTx lib seems to behave quite differently (in a bad way) than how it works over serial. One of my biggest problems is that the RxTx SerialPortEvent.OUTPUT_BUFFER_EMPTY does not work on linux over usbserial. How do I know when I should write to the stream? Any indicators I might have missed? So far my experience with writing and reading concurrently have not been great. Does anyone know if I should lock the DATA_AVAILABLE handler from being invoked while I'm writing on the stream? Or RxTx accepts concurrent read/writes? Thanks in advance

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  • Mercurial hg clone error - "abort: error: Name or service not known"

    - by Bojan Milankovic
    I have installed the latest hg package available for Fedora Linux. However, hg clone reports an error. hg clone http://localmachine001:8000/ repository reports: "abort: error: Name or service not known" localmachine001 is a computer within the local network. I can ping it from my Linux box without any problems. I can also use the same http address and browse the existing code. However, hg clone does not work. If I execute the same command from my Macintosh machine, I can easily clone the repository. Some Internet resources recommend editing .hgrc file, and adding proxy to it: [http_proxy] host=proxy:8080 I have tried that without any success. Also, I assume that proxy is not needed in this case, since the hg server machine is in my local network. Can anyone recommend me what should I do, or how could I track the problem? Thank you in advance.

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  • I need help with this ogre dependent header (Qgears)

    - by commodore
    I'm 2 errors away from compiling Qgears. (Hacked Version of the Final Fantasy VII Engine) I've messed with the preprocessors to load the actual location of the ogre header files. Here are the errors: ||=== qgears, Debug ===| /home/cj/Desktop/qgears/trunk/project/linux/src/core/TextManager.h|48|error: invalid use of ‘::’| /home/cj/Desktop/qgears/trunk/project/linux/src/core/TextManager.h|48|error: expected ‘;’ before ‘m_LanguageRoot’| ||=== Build finished: 2 errors, 0 warnings ===| Here's the header file: // $Id$ #ifndef TEXT_MANAGER_h #define TEXT_MANAGER_h #include <OGRE/OgreString.h> #include <OGRE/OgreUTFString.h> #include <map> struct TextData { TextData(): text(""), width(0), height(0) { } Ogre::String name; Ogre::UTFString text; int width; int height; }; typedef std::vector<TextData> TextDataVector; class TextManager { public: TextManager(void); virtual ~TextManager(void); void SetLanguageRoot(const Ogre::String& root); void LoadTexts(const Ogre::String& file_name); void UnloadTexts(const Ogre::String& file_name); const TextData GetText(const Ogre::String& name); private: struct TextBlock { Ogre::String block_name; std::vector<TextData> text; } Ogre::String m_LanguageRoot; // Line #48 std::list<TextBlock> m_Texts; }; extern TextManager* g_TextManager; #endif // TEXT_MANAGER_h The only header file that's in include that's not a ogre header file is "map". If it helps, I'm using the Code::Blocks IDE/GCC Compiler in GNU/Linux. (Arch) I'm not sure even if I get this header fixed, I think I'll have build errors latter, but it's worth a shot. Edit: I added the semicolon and I have one more error in the header file: error: expected unqualified-id before ‘{’ token

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  • Can't get Logback Eclipse plugin to display output

    - by Zombies
    I followed these instructions here: http://logback.qos.ch/consolePlugin.html I have the correct and found logback.xml, it is set up correctly, and the port is listening. Nothing shows up with logger.error("Test"); It logs to sysout fine when I remove logback.xml, which shows to me that the logback is working fine. I installed the plugin on linux by moving it to /usr/lib/eclipse/plugins ...The window shows up, but no logging events are showing up. I also added a catch all ACCEPT filter like on that link. Perhaps this is a linux permission issue?

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  • undefined reference linker error

    - by klaus-johan
    Hi, I've stuck myself in a c++ project under linux ,for which I get an undefined reference when I try to create an object of a class that I just wrote.I believe this is an linker error caused by the fact that somewhere , somehow I should tell the linker to take into account the new class. I looked at the project properties and at the run command it executes a script (cmake.sh) . Because the project wasn't created by me , and because I'm a novice in working under linux, I just don't know how to direct the linker to do what I expect him to do !

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  • Why GPRS modem provides embedded TCP/IP stack

    - by Christian Madsen
    My colleague and I are mining the GPRS MODEM market for a module suitable for use with embedded Linux. During the market scan, we see that several vendors highlight that their MODEMs include an embedded TCP/IP stack. This makes me wonder: when we are using embedded Linux which already contains a TCP/IP stack and connects using PPP, will it make use of the stack included in the GPRS MODEM at all? My current assumption is that the stack is included for use with tiny microcontroller OS that do not supply their own stack. Also some of the MODEMs allow for running small applications IN the MODEM baseband processor which could explain the embedded stack... So: is the TCP/IP stack supplied by the GPRS MODEM superfluous when using it with an HL OS or did I overlook something?

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  • What happens after a packet is captured?

    - by Rayne
    Hi all, I've been reading about what happens after packets are captured by NICs, and the more I read, the more I'm confused. Firstly, I've read that traditionally, after a packet is captured by the NIC, it gets copied to a block of memory in the kernel space, then to the user space for whatever application that then works on the packet data. Then I read about DMA, where the NIC directly copies the packet into memory, bypassing the CPU. So is the NIC - kernel memory - User space memory flow still valid? Also, do most NIC (e.g. Myricom) use DMA to improve packet capture rates? Secondly, does RSS (Receive Side Scaling) work similarly in both Windows and Linux systems? I can only find detailed explanations on how RSS works in MSDN articles, where they talk about how RSS (and MSI-X) works on Windows Server 2008. But the same concept of RSS and MSI-X should still apply for linux systems, right? Thank you. Regards, Rayne

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  • How to find connected hosts at network (vpn or lan)

    - by Javier Novoa C.
    Hello, I'm looking for possible solutions to the following need: I have a VPN configured (using openVPN over Linux, BTW), and I want to know at any moment which hosts are connected to it. I recognize that it probably is the same thing as trying to know which hosts are connected to a lan, so any of the solutions might do the job... The fact is that I once used a hamachi vpn on linux and with it I had the chance to know which hosts were connected to a particular network where I belonged, so I was wondering if something similar might be possible in openVPN (or even any VPN and/or any LAN). Preferably, I'm looking for opensource/free sw solutions, or maybe the hints to program it myself (in the most simple way if possible, not that I don't know how to program, but I'm trying to achieve this in a simple manner). But anyway, if there are no os/fsw solutions, any other one might do... Thanks a lot! Javier, Mexico city

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  • How can I include platform-specific native libraries in the .JAR file using Eclipse?

    - by Martin Wiboe
    Hello all, I am just starting to learn JNI. I have been following a simple example, and I have created a Java app that calls a Hello World method in a native library. I'd like to target Win32 and Linux x86. My library resides in a DLL, and I can call it just fine using LoadLibrary when the DLL is added to the root of my Eclipse project. However, I can't figure out how to get Eclipse to export a runnable JAR that includes the DLL and the .SO file for Linux. So my question is basically; how would you go about creating a project in Eclipse and include several versions of the same native library? Thank you, Martin

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  • How to find which type of system call is used by a program

    - by bala1486
    I am working on x86_64 machine. My linux kernel is also 64 bit kernel. As there are different ways to implement a system call (int 80, syscall, sysenter), i wanted to know what type of system call my machine is using. I am newbie to linux. I have written a demo program. include int main() { getpid(); return 0; } getpid() does one system call. Can anybody give me a method to find which type of system call will be used by my machine for this program.. Thank you....

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  • Understanding the output of ldd

    - by nebukadnezzar
    I'm having a hard time understanding the output of ldd - Especially the processor identifiers. The string in question is this one: Shortest.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, from ']', not stripped I have several questions about it: What does "ELF" mean? I know that's what Linux binaries are called like (Windows Binaries are called PE Binaries, "Portable Executable" Binaries), but isn't ELF an abbreviation for something? What does LSB mean? I can't even guess it... I see the string "Intel" there, now I seriously wonder about the portability of Linux binaries, as ldd seems to expect every binary to be compiled on a intel processor... but what if it wasn't compiled on a Intel processor? Or when I attempt to run the binary on a computer that doesn't run ontop of a Intel processor? Why the ']'? My guess is it should be some sort of Linker identify, but ']' doesn't look much like a Identifier... Thanks in advance

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  • what is the difference between "./somescript.sh" and ". ./somescript.sh"

    - by Peter
    This question may sounds silly to you. Today I was following some instructions to install a software in Linux. There was a script that needs to be run first. It set some environment variables. The instruction told me to execute . ./setup.sh, but I made a mistake by executing ./setup.sh. So the env was not set. Finally I noticed this and proceeded. I want to know what exactly is the difference between both? I am completely new to Linux so please be as elaborate as possible.

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  • Is there an ftp plugin for gedit that will let me work locally?

    - by RobertWHurst
    I'm trying to switch from a windows environment to Linux. I'm primarily PHP developer, but I do know quite a bit about other languages such as CSS, XHTML and Javascript. I need a way of editing my files locally because I work in a git repository and need to commit my saves. On windows I used Aptana and PDT. I'd save my files, upload via Aptana, then commit my work with git. I need to get a work flow going on my Linux machine now. If you know a better way to do this let me know, however my real question is, is there a plugin that allows gedit to upload files instead of working remotely?

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  • MySql UDF using shared library won't load

    - by Jarrod
    I am attempting to create a mysql UDF which will match a fingerprint using Digital Persona's free linux SDK library. I have written a trivial UDF as a learning experience which worked fine. However, when I added a dependency to Digital Persona's shared object I can no longer get MySql to load my UDF. I added includes to DP's headers and compiled my UDF using: gcc -fPIC -Wall -I/usr/src/mysql-5.0.45-linux-i686-icc-glibc23/include -shared -o dp_udf.so dp_udf.cc I also tried adding the -static argument, but whenever I restart MySql, I get the error: Can't open shared library 'dp_udf.so' (errno: 0 /usr/local/mysql/lib/plugin/dp_udf.so: undefined symbol: MC_verifyFeaturesEx) MC_verifyFeaturesEx is a function defined "dpMatch.h" which I included, and is implemented in libdpfpapi.so which I have tried placing in the same location as my dp_udf.so and in /usr/lib. Am I doing something wrong with my call to gcc (my C++ skills are rusty) or does MySql not allow UDFs to use additional shared objects?

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  • ptrace'ing of parent process

    - by osgx
    Hello Can child process use the ptrace system call to trace its parent? Os is linux 2.6 Thanks. upd1: I want to trace process1 from "itself". It is impossible, so I do fork and try to do ptrace(process1_pid, PTRACE_ATTACH) from child process. But I can't, there is a strange error, like kernel prohibits child from tracing their parent processes UPD2: such tracing can be prohibited by security policies. Which polices do this? Where is the checking code in the kernel? UPD3: on my embedded linux I have no errors with PEEKDATA, but not with GETREGS: child: getregs parent: -1 errno is 1, strerror is Operation not permitted errno = EPERM

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  • malloc()/free() behavior differs between Debian and Redhat

    - by StasM
    I have a Linux app (written in C) that allocates large amount of memory (~60M) in small chunks through malloc() and then frees it (the app continues to run then). This memory is not returned to the OS but stays allocated to the process. Now, the interesting thing here is that this behavior happens only on RedHat Linux and clones (Fedora, Centos, etc.) while on Debian systems the memory is returned back to the OS after all freeing is done. Any ideas why there could be the difference between the two or which setting may control it, etc.?

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  • How can I pipe a large amount of data as a runtime argument?

    - by Zombies
    Running an executable JAR on a linux platform here. The program it self works on a somewhat large amount of data, basically a list of URLs... could be up to 2k. Currently I get this from a simple DB call. But I was thinking that instead of creating a new mode and writing SQL to get a new result set and having to redploy everytime, I could just make the program more robust by passing in the result set (the list of URLs) that need to be worked on... so, within a linux environment, is there a pain-free/simple way to get the result set and pass it in dynamically? I know file i/o is one, but it doesn't seem to be effecient because each file has to be named, as well more logic to handle grabbing the correct file, creating a file with a unique name, etc.

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  • How can I find file system concurrency issues ?

    - by krosenvold
    I have an application running on Linux, and I find myself wanting windows (!). The problem is that every 1000 times or so I run into concurrency problems that are consistent with concurrent reading/writing of files. I am fairly sure that this behavior would be prohibited by file locking under Windows, but I don't have any sufficiently fast windows box to check. There is simply too much file access (too much data) to expect strace to work reliably - the sheer volume of output is likely to change the problem too. It also happens on different files every time. Ideally I would like to change/reconfigure the linux file system to be more restrictive (as in fail-fast) wrt concurrent access. Are there any tools/settings I can use to achieve this ?

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  • Testing the program in different OS

    - by Alex Farber
    I want to test my program by installing it in different OS versions. My development computer is Ubuntu. What other Linux versions can I test by installing them inside VirtualBox and running my program there? Though it is not critical for me right now, I want to try something different and see what happens. Also, what is the chance that the program running in Linux will work in the Unix OS? The program is not open source, I can distribute only pre-built binaries.

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  • Android and Kernel-Modules...

    - by Nils Pipenbrinck
    So - Android is build on top of a stripped down linux system. Most of the convenient utilities are missing but all the basics are there. I can call insmod and rmmod. No problem. But where do kernel-modules and firmware files reside? I can't find any. there is no /lib/modules in the standard distribution. Problem: I need modules. For sure don't want to compile support for each and every usb-device in the world into the linux-kernel. Where should I put them?

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