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  • Linux, static lib referring to other static lib within an executable

    - by andras
    Hello, I am creating an application, which consists of two static libs and an executable. Let's call the two static libs: libusefulclass.a libcore.a And the application: myapp libcore instantiates and uses the class defined in libusefulclass (let's call it UsefulClass) Now, if I link the application in the following way: g++ -m64 -Wl,-rpath,/usr/local/Trolltech/Qt-4.5.4/lib -o myapp src1.o src2.o srcN.o -lusefulclass -lcore The linker complains about the methods in libusefulclass not being found: undefined reference to `UsefulClass::foo()' etc. I found a workaround for this: If UsefulClass is also instantiated within the source files of the executable itself, the application is linked without any problems. My question is: is there a more clean way to make libcore refer to methods defined in libusefulclass, or static libs just cannot be linked against eachother? TIA P.S.: In case that matters: the application is being developed in C++ using Qt, but I feel this is not a Qt problem, but a library problem in general.

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  • Linux/OpenSSL:Send find output to openssl

    - by Starsky
    I am trying to send the output from the find command to OpenSSL in order to find out when certificates expire. This finds the files find . -name \*.pem -type f This generates the cert info I want openssl x509 -in certname.pem -noout -enddate Can I merge these two? Thanks for your help.

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  • Change Cursor for Netbeans on Linux

    - by Daziplqa
    Hi, I am recently have been successfully installed NetBean 6.8 on Ubuntu Box (10.04). But the problem is, NetBeans doesn't use the Gnome mouse Cursor by default. instead, It uses some freak mouse cursor that I hate! So, do you have any idea about how to change the cursor that appears inside netbeans.(I have looked inside tools options but without any output) Also I have did: $ grep -iR cursor * Binary file var/cache/all-resources.dat matches Binary file var/cache/all-layers.dat matches Binary file var/cache/index/s2/javascript/8/1/_0.cfs matches (note, I didn't talked here about how to change the cursor inside some Java program written in NetBeans) Thanks in advance.

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  • Differnce between linux write and sendfile syscall

    - by JosiP
    Hi Im programming webserver (C), which should send big files. My question is: What are the main differneces in two syscalls: write and sendfile. Does sendfile depends on size of socket system buffer ? I noticed that write often writes less then i requested. For example, if got many requests for one file: should i open it, copy into memory and use 'write', or maybe i can do 'sendfile' for each client ? thx in advance for all answers

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  • Linux Shared Memory

    - by Betamoo
    The function which creates shared memory in *inux programming takes a key as one of its parameters.. What is the meaning of this key? And How can I use it? Edit: Not shared memory id

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  • Linux C/C++ : How to reload dynamic modules?

    - by Arman
    Hi, Are there way to reload dynamic library? I am loading module by dlopen library: bool load_functions(){ std::string function_name="libfunction-factory.so"; void* handle = dlopen(function_name.c_str(), RTLD_NOW); //some initialization and usage // ''' // unload the library dlclose(handle); return true; } int main() { int i=0; for(;;) { cout<<"##prompt##"<<i++<<">"; if(std::cin.get()=='q') break; else { if(!load_functions()) std::cout<<"Failed to load Function Factory..."<<std::endl; } cout<<endl; } return 0; } after running I am editing library and trying to reload the library, but the new library does not load. Always the first loaded library is used. Are there way to force to reload library? Why dlclose does not unload library? Kind regards Arman.

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  • linux locale unset

    - by naugtur
    I have a ARM based machine with ubuntu distro on it and it often feeds me with this while running various commands: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "pl_PL.UTF-8" This is output of the locale command locale: Cannot set LC_CTYPE to default locale: No such file or directory locale: Cannot set LC_MESSAGES to default locale: No such file or directory locale: Cannot set LC_ALL to default locale: No such file or directory LANG=pl_PL.UTF-8 LC_CTYPE="pl_PL.UTF-8" LC_NUMERIC="pl_PL.UTF-8" LC_TIME="pl_PL.UTF-8" LC_COLLATE="pl_PL.UTF-8" LC_MONETARY="pl_PL.UTF-8" LC_MESSAGES="pl_PL.UTF-8" LC_PAPER="pl_PL.UTF-8" LC_NAME="pl_PL.UTF-8" LC_ADDRESS="pl_PL.UTF-8" LC_TELEPHONE="pl_PL.UTF-8" LC_MEASUREMENT="pl_PL.UTF-8" LC_IDENTIFICATION="pl_PL.UTF-8" LC_ALL= What should I do to stop it from popping now and then and configure it properly for the aescznól [important characters of mine]?

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  • How does symbol binding work for shared libraries in linux

    - by bbazso
    When compiling a cpp program with g++ -O0 I noticed that my binary does not contain the symbol for the empty string (basic_string): _S_empty_rep_storage When I do compile this same program with -O2 I notice that the aforementioned symbol is indeed contained within the binary as follows (using nm on the bin): 00000000006029a0 V _ZNSs4_Rep20_S_empty_rep_storageE@@GLIBCXX_3.4 My application uses several .so (dynamic libraries) and when my aplication loads I notice that several of these .so files bind as follows (I set LD_DEBUG=all and ran my program): 28596: binding file /home/bbazso/usr/local/lib/mydynamiclib.so [0] to /usr/lib64/libstdc++.so.6 [0]: normal symbol `_ZNSs4_Rep20_S_empty_rep_storageE' [GLIBCXX_3.4] 28596: binding file /home/bbazso/usr/local/lib/mydynamiclib.so [0] to /home/bbazso/workspace/mytestapplication [0]: normal symbol `_ZNSs4_Rep20_S_empty_rep_storageE' [GLIBCXX_3.4] 28596: binding file /home/bbazso/workspace/mytestapplication [0] to /usr/lib64/libstdc++.so.6 [0]: normal symbol `_ZNSs4_Rep20_S_empty_rep_storageE' [GLIBCXX_3.4]** But I also noticed that one of my .so only binds as follows: 28087: binding file /home/bbazso/usr/local/lib/anotherdynamiclib.so [0] to /usr/lib64/libstdc++.so.6 [0]: normal symbol `_ZNSs4_Rep20_S_empty_rep_storageE' [GLIBCXX_3.4] but never binds to the binary (mytestapplication) as shown above for the mydynamiclib.so. So I was wondering what this actually means? Does this mean that anotherdynamiclib.so will use a different symbol for the empty string above than the rest of the application? I guess what I'm really asking is how does symbol binding work in the context of the example above? Thanks!

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  • Map /dev/bus/usb node to /sys node on Linux

    - by Cody Brocious
    I'm using libusb to find and access a USB device, but once I get the information I need from there, I need to map it to a /sys node. This could be to the actual USB bus it's on, the /sys/bus/usb-serial node (which is where I'm going to get eventually), or effectively anywhere else since I can walk the tree from there. I can get to a /dev/bus/usb node easily enough, but I'm a bit lost from there. What would be the best route to perform this mapping?

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  • Background process in linux using Ruby on Rails

    - by Salil
    Hi All, I want to do some process such as sending emails or using ffmpeg commands in backgound as it takes to much time. I want it should run in a background. I am using Fedora 10. Also can i check whether my background process is running successfully or not . is it posssible?if yes what would be the steps i should follow.Any help is appreciated. Thanks in Advance.

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  • Create a thumbnail of a dwg in in a linux environment

    - by Kyle
    Creating a ruby on rails site that uses RMagick to create thumbnails for many types of images. RMagick cannot read dwg files however. I've tried a few things, looked into the Java library JDWGLib, which would probably allow me to write a converter, but it would be a total from the ground up solution, where I just need a thumbnail. Also considered using a viewer program to open the file in a remote X session and do a screen capture, however I'm not sure how I could ever guarantee that the viewer had completed opening when I took the screenshot. I'm not concerned with being able to manipulate the file other than to create the thumbnail. It is going to be used for commercial purposes, so any libraries used need to be compatible.

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  • Krusader on Linux

    - by Guus
    In Krusader you can create a New Network Connection (CTRL-N) How can I save those connections? Now I have to enter all details every time.

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  • Linux shared library that uses a shared library undefined symbol

    - by johnnycrash
    two shared libraries liba.so and libb.so. liba.so uses libb.so. All c files are compiled with -fPIC. Linking uses -shared. When we call dlopen on liba.so it cannot find symbols in libb.so...we get the "undefined symbol" error. We can dlopen libb.so with no errors. We know that liba is finding libb because we don't get a file not found error. We get a file not found error when we delete libb.so. We tried -lutil and no luck. Any ideas???? oh yeah. gcc 4.1.2

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  • Linux: file recovery (Urgent) [closed]

    - by Ashine
    Hi Firends, I desperately need some help regarding problem I am facing now. While creating a softlink for a very important file I gave the reverse command by mistake. Instead of giving it "ln target linkname" I have given it 'ln linkname target'. This has resulted in references pointing to target files are now pointing to links and the actual refernces to target files are lost. How can I recover the files back. "/home/user/data1" was original file location. "/home/user/db2" was the desired softlink for this data. I haveto give "ln data1 db2" but I have given 'ln db2 data1'. This has resulted in 'data1' being now pointing towards 'db2' and the actual data in 'data1' can not be retrieved. Some one please help. Thanks in advance.

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  • Data in linux FIFO seems lost

    - by Utoah
    Hi, I have a bash script which wants to do some work in parallel, I did this by putting each job in an subshell which is run in the background. While the number of job running simultaneously should under some limit, I achieve this by first put some lines in a FIFO, then just before forking the subshell, the parent script is required to read a line from this FIFO. Only after it gets a line can it fork the subshell. Up to now, everything works fine. But when I tried to read a line from the FIFO in the subshell, it seems that only one subshell can get a line, even if there are apparently more lines in the FIFO. So I wonder why cannot other subshell(s) read a line even when there are more lines in the FIFO. My testing code looks something like this: #!/bin/sh fifo_path="/tmp/fy_u_test2.fifo" mkfifo $fifo_path #open fifo for r/w at fd 6 exec 6 $fifo_path process_num=5 #put $process_num lines in the FIFO for ((i=0; i<${process_num}; i++)); do echo "$i" done &6 delay_some(){ local index="$1" echo "This is what u can see. $index \n" sleep 20; } #In each iteration, try to read 2 lines from FIFO, one from this shell, #the other from the subshell for i in 1 2 do date /tmp/fy_date #If a line can be read from FIFO, run a subshell in bk, otherwise, block. read -u6 echo " $$ Read --- $REPLY --- from 6 \n" /tmp/fy_date { delay_some $i #Try to read a line from FIFO read -u6 echo " $$ This is in child # $i, read --- $REPLY --- from 6 \n" /tmp/fy_date } & done And the output file /tmp/fy_date has content of: Mon Apr 26 16:02:18 CST 2010 32561 Read --- 0 --- from 6 \n Mon Apr 26 16:02:18 CST 2010 32561 Read --- 1 --- from 6 \n 32561 This is in child # 1, read --- 2 --- from 6 \n

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  • Programmatically talking to a Serial Port in OS X or Linux

    - by deadprogrammer
    I have a Prolite LED sign that I like to set up to show scrolling search queries from a apache logs and other fun statistics. The problem is, my G5 does not have a serial port, so I have to use a usb to serial dongle. It shows up as /dev/cu.usbserial and /dev/tty.usbserial . When i do this everything seems to be hunky-dory: stty -f /dev/cu.usbserial speed 9600 baud; lflags: -icanon -isig -iexten -echo iflags: -icrnl -ixon -ixany -imaxbel -brkint oflags: -opost -onlcr -oxtabs cflags: cs8 -parenb Everything also works when I use the serial port tool to talk to it. If I run this piece of code while the above mentioned serial port tool, everthing also works. But as soon as I disconnect the tool the connection gets lost. #!/usr/bin/python import serial ser = serial.Serial('/dev/cu.usbserial', 9600, timeout=10) ser.write("<ID01><PA> \r\n") read_chars = ser.read(20) print read_chars ser.close() So the question is, what magicks do I need to perform to start talking to the serial port without the serial port tool? Is that a permissions problem? Also, what's the difference between /dev/cu.usbserial and /dev/tty.usbserial?

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  • Run Linux command as predefined user

    - by vijay.shad
    Hi all, I have created a shell script to start a server program. startup.sh start When above command will executes, it will try starts the server as adminuser. To achieve this my script has written like this. SUBIT="su - adminuser -c " SERVER_BOX_COMMAND_A="Server" ############## # Function to start cluster function start(){ $SUBIT "$SERVER_BOX_COMMAND_A" } When i execute the command it asks for password. Is there any other way to do this so, it will not ask for password.

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  • sem_open() error: "undefined reference to sem_open()" on linux (Ubuntu 10.10)

    - by Robin
    So I am getting the error: "undefined reference to sem_open()" even though I have include the semaphore.h header. The same thing is happening for all my pthread function calls (mutex, pthread_create, etc). Any thoughts? I am using the following command to compile: g++ '/home/robin/Desktop/main.cpp' -o '/home/robin/Desktop/main.out' #include <iostream> using namespace std; #include <pthread.h> #include <semaphore.h> #include <fcntl.h> const char *serverControl = "/serverControl"; sem_t* semID; int main ( int argc, char *argv[] ) { //create semaphore used to control servers semID = sem_open(serverControl,O_CREAT,O_RDWR,0); return 0; }

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  • linux usb driver: probing already plugged devices

    - by jacob
    hello, im writing a Usb driver and i have an issue. when i insmod the driver with the device already plugged in before, the probe function is not called. it is only called after i disconnect the device and plug it again. i wanna make it work when i start my pc with the device plugged in. could someone please help me? best regards, jacob.

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