I am working on bringing up SPI on Kontron’s Atom-based SMARC-sXBTi board under Linux. Kontron provided Yocto BSP but it does not include SPI driver. I rebuilt Linux with SPI support. I can see the SPI controller in lspci and in sysfs the SPI PCI device is bound to pca2xx_spi_pci driver. As I understand…
Tag: linux
Adjust context switch frequency in Java on Linux
I’m looking into a potential concurrency issue in some binary Java code. The code sometimes has a strange behavior, but I’m not sure if it’s actually due to concurrency issues in the code itself, or if it’s something else. I haven’t been able to reproduce the strange behavior mys…
how to calculate percentage in shell
I would like to calculate percentage in shell. But I can’t do it. My script is It is neither showing any value nor terminating when executing this script. Answer awk will give you an n1 illegal field name if you do that, as it’s inside single quotes. Also, to avoid awk keep reading stdin you shoul…
Execute root command with no root user avoiding password prompt
I have a script.sh file executing the following command: If i try to execute with a non-root user (username = marco), the prompt password halts the script waiting for the input. I’m trying to configure the /etc/sudoers file adding the following lines, but with none of them works and I’m always pro…
Capture output from external command and write it to a file
I am trying to create a script that calls on a linux command from my Ubuntu server and prints the output of aforementioned command to txt files. This is literally the first script I’ve ever written, I just started learning python recently. I want 3 files in 3 separate folders with filenames unique to da…
boost asio notify server of disconnect
I was wondering if there is any way to notify a server if a client side application was closed. Normally, if I Ctrl+C my client side terminal an EOF-signal is sent to the server side. The server side async_read function has a handle which has boost::system::error_code ec argument fed into it. The handle is ca…
How to traverse when using `cat` command? [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 years ago. Improve this question How to travel in the shell using cat command? (arrow keys are not working) Answer I think yo…
HTTP Live Stream stops playing after a while
I have a problem with streaming with ffserver. After I start ffserver and desktop-capture, everything seems to work fine. Then I open the browser and access the output(http://localhost:8090/test1.mpeg). It plays fine for 6-7 seconds then it stops and I have to refresh the page to get it work again. Does anyon…
Facing issues writing code with perl expect
I want to run a command which will connect to a remote host and perform some actions, while I try to run the command below actions are required. also it asks for a password as below I have written a perl script as below: I needed a code which can answer the questions asked on console i.e. as below and
Automation of networks using ansible on openstack
I’ve written an ansible script, to create a network based on a condition. So that, even if I run ansible script again it will not create duplicate entries in my openstack environment. task: I don’t have either of the twonetworks in my project. My intention was, both the statments display null outp…