I'm looking for a good open source message bus that is suitable for embedded Linux devices (Linux and uClinux). It needs to satisfy the following criteria: Must be free software and LGPL or a more liberal license due to uClinux only supporting static linking Must have a C API Must have a relatively small footprint and not depend on th...
Many people string together find and sed, or perl, or any number of other unix commands to find and replace across multiple files. But, there's a simple command that can do it for you without the hassle. Thanks to The Digital Ninja for pointing out that it's rpl. This is not a built in command but, for debian based distros like Ubuntu ...
I have an ARM kit beside me and a Linux kernel source code patched with Xenomai on my machine. I understand I can send data to the kit through an USB cable and a (windows-based, of course) software, but I'm stumped as to exactly what I should be sending that would make the kit run Linux. (clarifications from comments: It is an Atmel AT9...
We have a JavaScript construct that will play .wav files within Firefox on Windows and MacOSX, but it does not work for Red Hat Linux. What extension do I need? ...
I'm using the following code to try to read the results of a df command in Linux using popen. #include <iostream> // file and std I/O functions int main(int argc, char** argv) { FILE* fp; char * buffer; long bufSize; size_t ret_code; fp = popen("df", "r"); if(fp == NULL) { // head off errors reading the results...
Does anyone have any experience with running C++ applications that use the boost libraries on uclibc-based systems? Is it even possible? Which C++ standard library would you use? Is uclibc++ usable with boost? ...
I need to set an environment variable in Python and find the address in memory where it is located. Since it's on Linux, I don't mind about using libraries that only work consistently on Linux (if that's the only way). How would you do this? Edit: The scope of the problem is as follows: I'm trying to hack a program for class, and essent...
My log file is: Wed Nov 12 blah blah blah blah cat1 Wed Nov 12 blah blah blah blah Wed Nov 12 blah blah blah blah Wed Nov 12 blah blah blah blah cat2 more blah blah even more blah blah Wed Nov 12 blah blah blah blah cat3 Wed Nov 12 blah blah blah blah cat4 I want to parse out the full multiline entries where cat is fo...
I have a directory with 500,000 files in it. I would like to access them as quickly as possible. The algorithm requires me to repeatedly open and close them (can't have 500,000 file open simultaneously). How can I do that efficiently. I had originally thought that I could cache the inodes and open the files that way, but *nix doesn't...
Accepting the possibility of extreme ridicule, I must admit that I really miss sun Teamware's filemerge tool. I have switched from solaris to red hat linux, and find myself regularly missing filemerge (not to be confused with the Apple tool of the same name), as well as the solaris version of pstack (which worked on core files just as we...
I am looking for a tool like ltrace or strace that can trace locally defined functions in an executable. ltrace only traces dynamic library calls and strace only traces system calls. For example, given the following C program: #include <stdio.h> int triple ( int x ) { return 3 * x; } int main (void) { printf("%d\n", triple(10));...
I want to use part of the output of a command run from the command line in another xterm, or as part of a different command. For instance: > grep error error.log error: can't find file ~/<some very long path>/thisfile and I want to do this: >ls ~/<some very long path>/ I know two ways to do this: 1. copy ~/<some very long path>/...
I'm currently trying to create a kernel module that will produce data based on kernel events and push them to a file. After reading that this is bad (and I agree), I decided it would make more sense to have the data in a /proc file that a user program could pull from when necessary. However, this idea led to all sorts of problems, part...
this was for an old computer class project which I am over with and now am wondering if there was a better way of doing things . we used to program an appointment.sh program where I solved the comparing time using an algorithm which converts time to a certain number you can compare today and tomorrow and of course what happens is it c...
I have to call ping from c++ code.I'd like to easily read the output for further utilizations. I have come up with two solutions: use a fork and a pipe, redirect ping output to the pipe and then parse it find a library suited for the purpose to use a ping(ip_addresss) function directly I'd like the latter but i didn't find anything ...
I am running a java program that sets up a database connection to an SQL database. It works fine on Mac OS X, but when I try to run the same code on Linux, I get a Exception in thread "main" java.lang.NoClassDefFoundError: java/sql/SQLClientInfoException. I am using jdk-1.6.0_02 - if I unzip src.zip, it turns out that SQLClientInfoExcep...
Hello. I'm running Xorg and my (Qt) program daemonises itself. Now I log out and restart the X server. When I log in again my process is still running fine, but I can't see it. Is there a way of attatching the new incarnation of the X server to the old process? If I don't restart the whole server, but log out and in again, is there a wa...
Hello I will have around 200,000 images as part of my website. Each image will be stored 3 times: full size, thumbnail, larger thumbnail. Full size images are around 50Kb to 500Kb. Normal tech: Linux, Apache, MySQL, PHP on a VPS. What is the optimum way to store these for fast retrieval and display via a browser?? Should I store ever...
Hi, I'm a non-computer science student doing a history thesis that involves determining the frequency of specific terms in a number of texts and then plotting these frequencies over time to determine changes and trends. While I have figured out how to determine word frequencies for a given text file, I am dealing with a (relatively, for...
Given a linux kernel oops, how do you go about diagnosing the problem? In the output I can see a stack trace which seems to give some clues. Are there any tools that would help find the problem? What basic procedures do you follow to track it down? Unable to handle kernel paging request for data at address 0x33343a31 Faulting instru...