Does Linux operating system exist? [closed]
AFAIK Linux is not an operating system, but a kernel. Even though, I encountered courses/articles where Linux was mentioned to be nothing but an OS like Windows, Solaris etc. Could someone give more...
View Articletrouble compiling a lkm in ubuntu
I'm doing some exercises to introduce operating system concepts and I am asked to create a loadable kernel module in linux in c. I copied the code from the book along with a makefile and am trying to...
View ArticleUnable to set scheduler value to "deadline"
I am trying to set scheduler value to "deadline", but it is reverting to none.:~ # echo "deadline" > /sys/block/md0/queue/scheduler:~ # cat /sys/block/md0/queue/scheduler noneI was able to set the...
View ArticleGet argv from bprm_check_security in linux kernel. Is the documentation wrong?
According to Linux Kernel's doc:bprm_check_security:This hook mediates the point when a search for a binary handler willbegin. It allows a check against the bprm->cred->security valuewhich was...
View Articlelinux/init.h: No such file or directory
I'm trying to build a kernel module for my class, and I'm getting a massive wall of errors, but at the top of said wall is the infamous 'No such file or directory' error. It seems to be the root of the...
View ArticleFailing to downgrade my kernel version Ubuntu 20.04
I am trying to downgrade my kernel version, because I am having problems installing AMD-pro GPU drivers.So I am using Ubuntu 20.04 and my kernel is:IN:uname -rOUT:5.4.0-65-genericI need kernel ver...
View ArticleWhy is data written to a file opened with O_APPEND flag, always written at...
I have been given a programming assignment:Write a program that opens an existing file for writing with the O_APPEND flag, and then seeks to the beginning of the file before writing some data. Where...
View ArticleWhy is the gdt not getting loaded in this code?
This is written in AT&T syntax. I'm asking if there is any issues with my gdt here, because my interrupts aren't working. Please point out any errors I may haveI'm using GRUB as my bootloader and...
View ArticleQEMU kernel for raspberry pi 3 with networking and virtio support
I used the QEMU(qemu-system-aarch64 -M raspi3) for emulating the Raspberry pi3 with the kernel from the working image. Everything was working but there was no networking.qemu-system-aarch64 \ -kernel...
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Connection to the Jupyter Notebook Server could not be established
For the past many months I am trying to code in Jupyter Notebook but whenever I open Jupyter Notebook, then, I see a message where it is written 'A connection to the notebook server could not be...
View ArticleWhat is the "current" in Linux kernel source?
I'm studying about Linux kernel and I have a problem.I see many Linux kernel source files have current->files. So what is the current?struct file *fget(unsigned int fd){ struct file *file; struct...
View ArticleLaplacian kernels of higher order in image processing
In literature on digital image processing you find examples of Laplace kernels of relatively low orders, typically, 3 or 5. I wonder, is there any general way to build Laplace kernels or arbitrary...
View ArticleHow to copy /var/lib/docker with overlayfs directory structure with data...
I have a docker installation with several images and about 150Gigs of data in /var/lib/docker. This setup uses overlayfs as its storage driver. There are several directories for each layer under...
View ArticleSymfony 4 phpunit : KERNEL_CLASS env variable error
I'm trying to learn how to make phpunit by testing the User class made by "make:user" but i'm facing this problem when extending "KernelTestCase" and run the test :LogicException: You must set the...
View ArticleKernel character device implementation
I wanted to make inter-processor communication through shared memory and using Pselect() to know that there is a data ready to read.If I type message from terminal for example then pressed Enter or any...
View ArticleHow Create bootable ISO to mount another img file after boot
I Have BSD img file encrypted by CRYPTO_LUKS (like sophos).I have decryption key as file.key.I want create and bootable iso using bzImage excecutable boot kernel for decrypt .img and mount into main...
View ArticleHow to create bootable application image (efi)?
I trying to boot an elf microkernel in an UEFI environment. So i compiled a minimal boot loader and created an ESP image. This works fine if I boot via an HDD but I want to direct boot it via the qemu...
View ArticleInstall Python 3.8 kernel in Google Colaboratory
I try to install a new Python version (3.8) using conda.!wget -O mini.sh https://repo.anaconda.com/miniconda/Miniconda3-py38_4.8.2-Linux-x86_64.sh!chmod +x mini.sh!bash ./mini.sh -b -f -p...
View Articlegstreamer fails at "Call to S_FMT failed"
Hi I have been trying to use gstreamer to send web cam image over the network. The following command fails../test-launch --gst-debug=3 '( v4l2src device=/dev/video2 ! image/jpeg,width=800,height=600 !...
View ArticleJupyter_Kernel error_%1 is not a valid Win32 application
I've installed Anaconda 4.9.2 64-Bit to my Windows 10 64-Bit. Wanted to open Jupyter within it's shortcut, but it didn't work. Then I tried to open Jupyter through Anaconda prompt with command jupyter...
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