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@sylv-io
sylv-io / gen_symbol_offsets.py
Created October 25, 2022 23:30
Convert EDK2 OVMF console log to a GDB script that adds symbol information (add-symbol-file)
#!/usr/bin/env python
import argparse
import sys
import os
import pefile
build_dir='Build/OvmfX64/DEBUG_GCC5/X64'
def parse_flags()->argparse.Namespace:
@Miouyouyou
Miouyouyou / drm-prime-dumb-kms.c
Last active October 24, 2023 06:28
Simple example showing how to use DRM to : allocate a Dumb buffer on the GPU, use it as a framebuffer, use this CRTC on the currently connected screen (expecting 1 connected screen), export the buffer, reimport it implicitly with mmap and write in it.
// This will works on Embedded GPU that implements .gem_prime_mmap like Rockchip ones.
// This will fail on most DRM drivers for GPU with dedicated memory as they tend to NOT implement .gem_prime_mmap.
#include <stdio.h>
#include <libdrm/drm.h>
#include <stdint.h>
#include <sys/mman.h>
#include <string.h>
@leommoore
leommoore / systemd_services.md
Last active April 25, 2024 02:46
Systemd Services 101

Check that your system supports systemd

pidof systemd
2733

If this return a number then your system supports systemd. Most Linux distributions in 2017 support systemd.

Check out the proceses currently running.

Since systemd starts the process then all processes will be children of systemd

@JamesDunne
JamesDunne / i2c.c
Last active May 2, 2024 17:20
C library for reading/writing I2C slave device registers from Raspberry Pi 1 Model B
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <linux/i2c-dev.h>
// Terrible portability hack between arm-linux-gnueabihf-gcc on Mac OS X and native gcc on raspbian.
#ifndef I2C_M_RD
#include <linux/i2c.h>
#endif
@NickSeagull
NickSeagull / ubuntu-bloat-removal.sh
Last active July 23, 2024 03:54
Updated Jan 22nd, 2024 - Simple command to remove all "bloatware" from ubuntu
sudo apt-get remove \
aisleriot \
brltty \
duplicity \
empathy \
empathy-common \
example-content \
gnome-accessibility-themes \
gnome-contacts \
gnome-mahjongg \
Below are the Big O performance of common functions of different Java Collections.
List | Add | Remove | Get | Contains | Next | Data Structure
---------------------|------|--------|------|----------|------|---------------
ArrayList | O(1) | O(n) | O(1) | O(n) | O(1) | Array
LinkedList | O(1) | O(1) | O(n) | O(n) | O(1) | Linked List
CopyOnWriteArrayList | O(n) | O(n) | O(1) | O(n) | O(1) | Array
@irbull
irbull / OpenSSLExample.cpp
Created August 11, 2016 18:32
Code signing and verification with OpenSSL
#include <iostream>
#include <openssl/aes.h>
#include <openssl/evp.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <assert.h>
@subfuzion
subfuzion / curl.md
Last active July 18, 2024 17:12
curl POST examples

Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

@xkr47
xkr47 / letsencrypt-jetty.sh
Last active June 26, 2024 09:03
How to use Letsencrypt certificate & private key with Jetty
# input: fullchain.pem and privkey.pem as generated by the "letsencrypt-auto" script when run with
# the "auth" aka "certonly" subcommand
# convert certificate chain + private key to the PKCS#12 file format
openssl pkcs12 -export -out keystore.pkcs12 -in fullchain.pem -inkey privkey.pem
# convert PKCS#12 file into Java keystore format
keytool -importkeystore -srckeystore keystore.pkcs12 -srcstoretype PKCS12 -destkeystore keystore.jks
# don't need the PKCS#12 file anymore