shafik

What is the Strict Aliasing Rule and Why do we care?

(OR Type Punning, Undefined Behavior and Alignment, Oh My!)

What is strict aliasing? First we will describe what is aliasing and then we can learn what being strict about it means.

In C and C++ aliasing has to do with what expression types we are allowed to access stored values through. In both C and C++ the standard specifies which expression types are allowed to alias which types. The compiler and optimizer are allowed to assume we follow the aliasing rules strictly, hence the term strict aliasing rule. If we attempt to access a value using a type not allowed it is classified as undefined behavior(UB). Once we have undefined behavior all bets are off, the results of our program are no longer reliable.

Unfortunately with strict aliasing violations, we will often obtain the results we expect, leaving the possibility the a future version of a compiler with a new optimization will break code we th

masklinn

I've never had great understanding of launchctl but the deprecation of the old commands with launchctl 2 (10.10) has been terrible as all resources only cover the old commands, and documentation for Apple utilities is generally disgracefully bad, with launchctl not dissembling.

Mad props to https://babodee.wordpress.com/2016/04/09/launchctl-2-0-syntax/ which contains most details

domains

Internally, launchd has several domains, but launchctl 1 would only ask for service names,

goldengrape

# coding: utf-8

# # 持续训练
# 
# 问题提出: 如果人脸识别在使用中发现准确率并不够高, 是否可以继续改进? 如何在已有的基础之上继续改进? 
# 
# 解决方法: 建立并联的判别神经网络, 将A人脸的128位编码和待测人脸的128位编码作为输入, 二值判别输出 
# * 路径A: 计算二阶范数距离, 并以原题目中的阈值作为分界, 形成输出
# * 路径B: 待训练神经网络, 早期时参数值都很小, 因此输出值也很小, 但可被训练. 

Proteas

Following are my steps to build the ARM64 version of xnu-4570.1.46, hope this is helpfull for saving time.
1. Use Xcode 9.0
2. Preparation is same as macOS, and there is a guide: https://0xcc.re/building-xnu-kernel-macosx-sierrra-10-12-x/
3. There is an ARM64 version libfirehose: https://github.com/Proteas/install_firehose_lib
4. Copy and edit the ARM64 config(CFLAGS, LDFLAGS) from darwin-on-arm/xnu to your target project
5. Example CFLAGS: -Darm64 -DARM64 -D__arm64__ -D__ARM64__ -DLP64 -DCONFIG_EMBEDDED -mkernel -DARM64_BOARD_CONFIG_T8011=1
6. Fix compiling stage errors by directly importing the missing headers or editing the code
7. Fix linking stage errors by implementing place holder funcitons for: chudxnu_cpu_alloc, etc 
8. If missing symbol __divti3 in linking stage, get the runtime from llvm.

lenew

#Download realtek r8168 linux driver from official site [http://www.realtek.com/downloads/downloadsView.aspx?PNid=13&PFid=5&Level=5&Conn=4&DownTypeID=3]
#Unpack source file
#Replace orginal Makefile with this file
#Put this source to 'package' folder of OpenWRT/LEDE SDK
#Build(make menuconfig, make defconfig, make)

include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/kernel.mk

PKG_NAME:=r8168

lattner

Swift Concurrency Manifesto

Author: Chris Lattner

Chinese Translation by Jason Yu

Contents

• Introduction
• Overall Vision

inamiy

React & Elm inspired frameworks in Swift

This is a curated list of iOS (Swift & ObjC) frameworks which are inspired by React and Elm.

Swift frameworks

React-inspired

• ReactSwift by @ColinEberhardt
• https://github.com/ColinEberhardt/ReactSwift

deanlyoung

Note

Apple will reject apps that are using private url schemes (Ugh, Apple....) if they are pretty much obvius. Some apps are rejected and others are not, so, be aware of this issue before implementing any of those URL's in your app as a feature.

Updates

• [UPDATE 4] iOS 10 update: apparently settings now can be reached using App-Pref instead of prefs
• [UPDATE 3] For now you just can use url schemes to open your apps's settings with Swift 3.0 (Xcode 8). I'll keep you informed when OS preferences can be reached
• [UPDATE 2] The openURL() method of UIApplication is now deprecated. You should use application(_:open:options:) instead
• [UPDATE 1] Not yet tested in iOS 10. It will fail because of policies changes in URL scheme handling.

mdo

Ikea Bekant standing desk with Gerton table top

williballenthin

'''
IDA plugin to display the calls and strings referenced by a function as hints.

Installation: put this file in your %IDADIR%/plugins/ directory.
Author: Willi Ballenthin <[email protected]>
Licence: Apache 2.0
'''
import idc
import idaapi
import idautils