How to Get Current Working Directory in C (getcwd)
Get current working directory path in C: use POSIX getcwd(buffer, size), handle PATH_MAX limits, dynamic memory allocation, and chdir().
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Linux Kernel
Linux Kernel
Powerfully Reboot Linux with a Kernel Module: Using emergency_restart API
Linux Kernel Modules are pieces of code that can be loaded into the Linux kernel to extend … Read more
How to Extract 7z Archives in Linux Terminal
Extract 7z archive files in Linux: install p7zip-full, run 7z x archive.7z for full path decompression, list contents with 7z l, and extract specific files.
How to Create a Yocto Recipe Using recipetool
Create custom Yocto Project recipes automatically: use recipetool create, parse source tarballs, generate bitbake recipes, and compile meta-layers.
How to Start and Stop Android Services via ADB Shell
Control Android background services from command line: execute adb shell am startservice, am start-foreground-service, and am stopservice.
How to Add and Delete User Accounts on Ubuntu Linux
Manage Linux user accounts on Ubuntu: add users with adduser, grant sudo privileges, delete users with deluser --remove-home, and inspect /etc/passwd.
How Linux Kernel Auto-Loads Drivers via MODALIAS
Understand Linux kernel module auto-loading: trace USB/PCI uevent broadcasts, MODALIAS environment strings, udev matching, and modprobe execution.
Tracing the Android OS Power-Off & Shutdown Sequence
Trace the Android OS power-off shutdown sequence in AOSP: inspect ShutdownThread.java, PowerManagerService, init reboot property, and kernel halt.
How to Set Up MiniDLNA Media Server on Ubuntu Linux
Set up a lightweight MiniDLNA (ReadyMedia) server on Ubuntu: configure /etc/minidlna.conf media folders, port 8200, systemctl service, and DLNA clients.
Dynamic Debugging with pr_debug in Linux Kernel
Enable dynamic debugging in Linux kernel modules: configure pr_debug(), toggle debug statements via /sys/kernel/debug/dynamic_debug/control, and dmesg.
How to Check Endianness (Little vs Big Endian) in C
Check CPU byte ordering in C: inspect pointer casting (char*)&val, compare Little-Endian vs Big-Endian memory, and convert network byte order (htons).
Reading Information from Sysfs Files in Linux: A Complete C Program Tutorial
Sysfs is a virtual filesystem in Linux that provides information and control over kernel objects and devices. … Read more
How to Enable DRM Driver Debug Logging in Linux
Enable Direct Rendering Manager (DRM) kernel debug logging: set drm.debug=0x1f boot parameter, inspect dmesg, and debug display stack output.
Integrate a Custom Driver Module into the Linux Kernel Source Tree
While out-of-tree loadable kernel modules ( .ko ) are useful for out-of-band development, integrating a driver into the Linux kernel source tree allows it to be configured via make menuconfig and compiled statically ( vmlinux ) or as a modular driver target. Step 1: Create driver directory and C s
Understanding Debug Levels for Linux Kernel PrintK: A Comprehensive Guide
In Linux kernel development, debugging is an essential process for identifying and fixing issues. The printk function … Read more
Understanding Linux Kernel likely and unlikely Macros: Optimization Insights
In Linux kernel development, performance optimization is crucial for ensuring efficient execution of code. The likely and … Read more
Read Screen Information in C: Example Using struct fb_var_screeninfo and struct fb_fix_screeninfo
Accessing screen information such as screen size and resolution is crucial for various applications and drivers in … Read more
How to Test Linux Framebuffer Drivers in C (mmap /dev/fb0)
Test Linux kernel framebuffer drivers in C: open /dev/fb0, fetch screen dimensions via FBIOGET_VSCREENINFO ioctl, and paint pixels via mmap().
How to Benchmark USB Flash Drive Read/Write Speed on Linux
Measure USB flash drive write and read speed on Linux: benchmark block performance using dd count=1000 bs=1M status=progress and hdparm.
Top Open Source Linux Performance & Debugging Tools
Master open-source Linux performance profiling and debugging tools: trace system calls with strace, profile CPU with perf, and find memory leaks.
How to Transfer Files Securely with SFTP on Ubuntu Linux
Transfer files securely over SSH using SFTP on Ubuntu Linux: connect via sftp user@host, download with get, upload with put, and configure non-standard ports.
How to Check CentOS and RHEL Version in Linux
Check CentOS and Red Hat Enterprise Linux (RHEL) release versions from terminal: inspect cat /etc/os-release, hostnamectl, and rpm -q centos-release.
How to Configure Bluetooth on Ubuntu (bluetoothctl)
Configure Bluetooth adapters on Ubuntu Linux: use bluetoothctl scan on, pair MAC address, connect devices, and manage hci0 interfaces in terminal.
How to Debug ARM Binaries on x86 Host with QEMU and GDB
Debug ARM ELF binaries on x86_64 host: run qemu-arm -g 1234 ./arm_binary, attach gdb-multiarch remote target localhost:1234, and inspect registers.