Juxhin JuxhinDB

## WhatIsStrictAliasingAndWhyDoWeCare.md

      
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                shafik
                / WhatIsStrictAliasingAndWhyDoWeCare.md
            
            
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              May 2, 2024 15:08
            
              
                What is Strict Aliasing and Why do we Care?
              
          
    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

  
## rr-with-rust.md

      
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                spacejam
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                using rr with rust
              
          
    using rust with rr

rr is a great debugging tool. it records a trace of a program's execution, as well as the results of
any syscalls it executes, so that you can "rewind" while you debug, and get deterministic forward and reverse
instrumented playback. it works with rust, but by default if you try it out, it could be pretty ugly when you
inspect variables. if this bothers you, configure gdb to use a rust pretty-printer
rr is probably in your system's package manager.
usage


## Ansible Let's Encrypt Nginx setup
Ansible playbook to setup HTTPS using Let's encrypt on nginx.

The Ansible playbook installs everything needed to serve static files from a nginx server over HTTPS.
The server pass A rating on [SSL Labs](https://www.ssllabs.com/).

To use:
 1. Install [Ansible](https://www.ansible.com/)
 2. Setup an Ubuntu 16.04 server accessible over ssh
 3. Create `/etc/ansible/hosts` according to template below and change example.com to your domain
 4. Copy the rest of the files to an empty directory (`playbook.yml` in the root of that folder and the rest in the `templates` subfolder)

## docker-clear.bat
@echo off
FOR /f "tokens=*" %%i IN ('docker ps -aq') DO docker rm %%i
FOR /f "tokens=*" %%i IN ('docker images --format "{{.ID}}"') DO docker rmi %%i
	Ansible playbook to setup HTTPS using Let's encrypt on nginx.

	The Ansible playbook installs everything needed to serve static files from a nginx server over HTTPS.
	The server pass A rating on [SSL Labs](https://www.ssllabs.com/).

	To use:
	1. Install [Ansible](https://www.ansible.com/)
	2. Setup an Ubuntu 16.04 server accessible over ssh
	3. Create `/etc/ansible/hosts` according to template below and change example.com to your domain
	4. Copy the rest of the files to an empty directory (`playbook.yml` in the root of that folder and the rest in the `templates` subfolder)
	@echo off
	FOR /f "tokens=*" %%i IN ('docker ps -aq') DO docker rm %%i
	FOR /f "tokens=*" %%i IN ('docker images --format "{{.ID}}"') DO docker rmi %%i