neilwu neil-wu

Using OS X as a Syslog Server

This document describes how to set up an OS X to be a syslog server that logs messages from the local network. It was largely meant for my own purposes so that I don't forget what I did, but feel free to use it for your own purposes.

A problem with just "turning this on" is that you will not see the correct hostname in the syslog entries. What we will do is use

Download and install the font

Download the Consolas font from http://www.fontpalace.com/font-details/Consolas/
Open Finder and navigate to Downloads directory
Double click the Consolas.ttf file
A dialog box appears displaying the details about the font
Click Install font button

Using Consolas font on IntelliJ IDEA:

Open IDEA Preferences Window (Press Command + ,)
Editor > Colors & Fonts > Font

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.
Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

	/* DeviceUID.h
	#import <Foundation/Foundation.h>

	@interface DeviceUID : NSObject
	+ (NSString *)uid;
	@end
	*/


	// Device.m

	NSData *provisioningProfile = nil;
	NSData *raw = [NSData dataWithContentsOfURL:[NSBundle.mainBundle URLForResource:@"embedded" withExtension:@"mobileprovision"]];
	char *start = memmem(raw.bytes,
	raw.length,
	"<!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0",
	47);
	if (start) {
	char *end = memmem(start,
	(uintptr_t)start - raw.length,
	"</plist>",

	[General]
	loglevel = notify
	skip-proxy = 127.0.0.1, 192.168.0.0/16, 10.0.0.0/8, 172.16.0.0/12, 100.64.0.0/10, localhost, *.local, ::ffff:0:0:0:0/1, ::ffff:128:0:0:0/1
	bypass-tun = 192.168.0.0/16, 10.0.0.0/8, 172.16.0.0/12

	# dns-server = 119.29.29.29,223.5.5.5,114.114.115.115
	# external-controller-access = [email protected]:6155
	# ipv6 = true

	// REMEMBER TO CHANGE THE external-controller-access' PASSWORD

	# WeChat aud file converter to wav files
	# Dependencies:
	# SILK audio codec decoder (available at https://github.com/gaozehua/SILKCodec)
	# ffmpeg
	#
	# By Gabriel B. Nunes ([email protected])
	# Adapted from another script by Nicodemo Gawronski ([email protected])
	#

	import os, argparse, subprocess

	#!/bin/bash
	# update_gfwlist.sh
	# Author : VincentSit
	# Copyright (c) http://xuexuefeng.com
	#
	# Example usage
	#
	# ./whatever-you-name-this.sh
	#
	# Task Scheduling (Optional)

	//
	// Obfuscator.swift
	// SwiftObfuscatorExample
	//
	// Created by Mathieu White on 2016-07-03.
	// Copyright © 2016 Mathieu White. All rights reserved.
	//

	import Foundation

	var GB2260 = {
	"110000": "北京市",
	"110100": "北京市市辖区",
	"110101": "北京市东城区",
	"110102": "北京市西城区",
	"110103": "北京市崇文区",
	"110104": "北京市宣武区",
	"110105": "北京市朝阳区",
	"110106": "北京市丰台区",
	"110107": "北京市石景山区",