I have two applications running on Embedded Linux board. One runs as a daemon and other acts as an interface for it. They communicate with each other using Unix sockets. As to handle any abnormal termination of socket, I tried terminating the interface application [ctr+c]. But as a result, the daemon applicat…
Tag: linux
How to get all lines from one file which contain a string in another file?
File 1: File 2: My desired output: I am trying to implement this using bash or Python. In python I tried: In bash I was thinking of using grep but grep will give the output that matches the entire line but this is not the case here. Any ideas? Answer This is what works finally.
“Name or service not knownname” using SSH from script [closed]
Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers. Closed 7 y…
possible missing library when running cmake
I am trying to install a program on my machine (running Linux), but I get the following error when I run make: What is wrong, am I missing a library? Answer The problem is that the Makefile uses bash specific syntax (|&) but the commands are executed by /bin/sh, which does not point to /bin/bash. On my co…
Why does linking with pthread cause a segmentation fault?
I have a stripped down simple program with a static variable (‘abc.cpp’): I compile it and it works: However, if I link in the pthread library…. I know it doesn’t use threading here, but in the actual non-stripped-down program, it links to a library that does use threading. It feels li…
Audio Channel change/swap automatically
I am working with digital TV in Linux platform. Currently I am facing with one issue in audio. When I give stereo audio to Function and after long time running the audio channels get swapped. That is, right channel audio hearing in Left channel and Left in Right. I dumped the PCM data in to a file before givi…
How can I make a chgrp command optional in my install script?
I’m creating an install script for a Linux game. As part of the installation, I change the suid permissions of the game executable to the “games” group so that the game can update the highscore file even when its run by regular users. Right now my Makefile.am looks like this: The problem I a…
What is the integer value of AF_UNIX?
So, I’m trying to write some JNA code to work with Unix sockets, and I’m trying to reference AF_UNIX for sockets. I looked through some of the gcc included files, but I couldn’t find anything. Answer On my Ubuntu-machine it is defined in /usr/include/x86_64-linux-gnu/bits/socket.h as 1. I ha…
Ubuntu: hadoop command not found
I am trying to check my installation of hadoop. I did create the environment variables and when I call printenv, I do see my HADOOP_HOME and PATH variables printed and correct (home/hadoop and HADOOP_HOME/bin respectively). If I go to home/hadoop in the terminal and call ls, I see the hadoop file there. If I …
How to distinguish between pressed, released and long press when using QAbstractButton::autoRepeat
I am using Qt 4.8.X on Linux with X11 and/or Qt-QWS with custom buttons derived from QAbstractButton. Now I have to distinguish between a button press, release and the user holding down the button. To do so, I would like to use QAbstractButton::autoRepeat as described in this question. As the QT Documentation…