chaicko

#! /usr/bin/awk -f
# A script to extract the actual suppression info from the output of (for example) valgrind --leak-check=full --show-reachable=yes --error-limit=no --gen-suppressions=all ./minimal
# The desired bits are between ^{ and ^} (including the braces themselves).
# The combined output should either be appended to /usr/lib/valgrind/default.supp, or placed in a .supp of its own
# If the latter, either tell valgrind about it each time with --suppressions=<filename>, or add that line to ~/.valgrindrc
 
# NB This script uses the |& operator, which I believe is gawk-specific. In case of failure, check that you're using gawk rather than some other awk
 
# The script looks for suppressions. When it finds one it stores it temporarily in an array,
# and also feeds it line by line to the external app 'md5sum' which generates a unique checksum for it.

chaicko

// Allows:
//   funkyParser()

module.exports = function createFunkyParser(opt) {
  return new FunkyParser(opt)
}

function FunkyParser(opt) {
  // make params optional
  opt = opt || {}

chaicko

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

chaicko

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

chaicko

#!/usr/bin/env bash
cd $HOME
git clone git://git.linaro.org/qemu/qemu-linaro.git qemu-linaro
cd qemu-linaro
sudo apt-get build-dep qemu # to install the build dependencies of qemu
./configure --target-list=arm-softmmu --prefix=$HOME/qemu
make
make install

# Now you have a QEMU in $HOME/qemu/bin/qemu-system-arm and can test a BeagleBoard-xM build on qemu by running:

chaicko

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>

#define FILEPATH "/tmp/mmapped.bin"
#define NUMINTS  (1000)

chaicko

You might want to read this to get an introduction to armel vs armhf.

If the below is too much, you can try Ubuntu-ARMv7-Qemu but note it contains non-free blobs.

Running ARM programs under linux (without starting QEMU VM!)

First, cross-compile user programs with GCC-ARM toolchain. Then install qemu-arm-static so that you can run ARM executables directly on linux

chaicko

Secure Remote Password explained for mere mortals

Discrete Logarithm

Most SRP calculations happen in the group of integers modulo a large number N. Basically whenever a number x grow beyond N you use x mod N instead.

chaicko

'use strict';

module.exports = function CustomError(message, extra) {
  Error.captureStackTrace(this, this.constructor);
  this.name = this.constructor.name;
  this.message = message;
  this.extra = extra;
};

require('util').inherits(module.exports, Error);

chaicko

// # Mocha Guide to Testing
// Objective is to explain describe(), it(), and before()/etc hooks

// 1. `describe()` is merely for grouping, which you can nest as deep
// 2. `it()` is a test case
// 3. `before()`, `beforeEach()`, `after()`, `afterEach()` are hooks to run
// before/after first/each it() or describe().
//
// Which means, `before()` is run before first it()/describe()