Oxide and Friends Twitter Space: May 24, 2021

• The other Adam Leventhal [1] and the other AHL [2]
• [@3:16](https://youtu.be/85eApYSj3ic?t=196) Hockey 
  • Calder Cup
  • Charlotte Checkers
  • Grand Rapids Griffins
• [@4:02](https://youtu.be/85eApYSj3ic?t=242) Roger Faulkner invented the /proc filesystem
• Gerald Ford Presidential Library and Museum
  • Gerald Ford inaugural address (including its most famous line, “our long national nightmare is over”) > I went in a Gerald Ford cynic, and came out a Gerald Ford super-fan
• Roger’s “The Process File System and Process Model in UNIX System V” paper
• [@7:43](https://youtu.be/85eApYSj3ic?t=463) “I am on a mission from God to make programs debuggable” 
  • AVL trees and linked lists > Performance is the root of all evil.
  • Trace Normal Form
  • Watchpoints, libwatchmalloc > Watchpoints are magical, when they work. It feels like a superpower.
• [@11:37](https://youtu.be/85eApYSj3ic?t=697) > Roger made this incredible contribution about debugging infrastructure > being an attribute of a production system. 
  • strace, truss
  • BONUS: 1986 USENIX: A System Call Tracer in UNIX
  • The ptrace(2) system call
  • ptrace’s overloading of the wait(2) system call
  • The German word that we’re seeking: Misappropriation-of-mechanism-in-a-seemingly-clever way-but-is-ultimately-a-disaster > ptrace is the x86 of system calls
• [@16:45](https://youtu.be/85eApYSj3ic?t=1005) A long-coming apology.. 
  • Linux branded zones (LX)
  • “Method and system for child-parent mechanism emulation via a general interface” patent > You have to be bug-for-bug compatible.
  • LX vfork/signal bug that broke golang > vfork: unsafe at any speed, toxic in any quantity
• [@20:16](https://youtu.be/85eApYSj3ic?t=1216) Upstart’s problematic use of ptrace(2)
  • Celebrating Joshua getting ptrace correct for LX branded zones
  • Stack shenanigans breaking LX
  • Red zone, segmented stacks
• [@24:39](https://youtu.be/85eApYSj3ic?t=1479) The application was fishing in its own stack.. 
  • Clozure Common Lisp, mcontext > These kinds of lies just don’t nest. Magic does not layer well.
• [@28:56](https://youtu.be/85eApYSj3ic?t=1736) Windows Subsystem for Linux WSL
• illumos on an M1? 
  • QEMU, ARM Cortex-M > It’s hard to get the machine really properly emulated
  • AWS Mac minis
• [@33:55](https://youtu.be/85eApYSj3ic?t=2035) It’s kind of amazing that Apple has never had much interest in the server space. 
  • Apple Xserve
  • CHRP
• The story of the stolen laptop. Little endian PowerPC 
  • OpenPOWER
• [@37:35](https://youtu.be/85eApYSj3ic?t=2255) Language H! 
  • NCR
  • Language H: An informal overview ( part 1, part 2)
• The (other) D language
• [@39:12](https://youtu.be/85eApYSj3ic?t=2352) 
  • AADEBUG’03
  • Postmortem Object Type Identification
• [@41:31](https://youtu.be/85eApYSj3ic?t=2491) It all comes back to awk
  • Bourne shell source code / Algol68 #defines
  • Thompson shell
• Bryan’s 2007 Dtrace review, Google TechTalk ~80mins
• [@48:07](https://youtu.be/85eApYSj3ic?t=2887) Dtrace language inspiration 
  • Dtrace clones > It was all based on us exploring some phenomenon, > something being kind of a pain in the ass or impossible, > and inventing something that was easy to use.
  • Architectural review board: “This reminds us a lot of awk..” > What’s the most powerful one-liner you can crank out with awk?
  • CUDA, Bluespec
• [@52:35](https://youtu.be/85eApYSj3ic?t=3155) Rust proc_macros
  • C preprocessor
  • Rust macro_rules! > Reading about it for the first time, it felt like the forbidden fruit
• Tcl
• INTERCAL which might have been co-invented by Tom’s brother?!
• Plan 9