kazcw

Sparse blocks

• exchange priority policies in peer introductions
• assign unique sequential IDs in the order the transactions were inved (per peer) receiving a getdata for a tx updates last-known-peer-received inv to all invs up to the one referenced
• include ID-last-received, last-known-peer-received in sparse block
• reference txes in sparse block by index in receiver's prioritiziation with peer's sent invs up to ID-last-received and sender's prior invs up to last-known-peer-received

kazcw

[package]
name = "rust-async-qotd"
version = "0.1.0"
authors = ["Gökberk Yaltıraklı <[email protected]>"]

[dependencies]
tokio = { git = "https://github.com/tokio-rs/tokio" }
rand = "0.3"

kazcw

{ pkgs ? import <nixpkgs> {} }:                                                                                               
                                                                                                                              
(pkgs.buildFHSUserEnv {                                                                                                       
  name = "esy-env";
  targetPkgs = pkgs: (with pkgs;                                                                                              
    [                                                                                                                         
      # this set suffices to build esy 0.3.4 with esy 0.2.11
      # and also to build the hello-ocaml demo with esy 0.3.4
      nodejs-10_x
      stdenv.cc

kazcw

stdenv.mkDerivation {
  name = "rustc-local";
  buildInputs = [
    gcc gnumake python2 cmake curl git
    # if enabled in config.toml
    ninja
  ];
}

kazcw

Classification of undefined behavior that is not demonstrably unreachable in production:

Unportable (across toolchains as well as platforms)

Classes of "technically undefined" behavior that a lot of software depends on, so the supported toolchain/platform combinations wouldn't be able to get away with breaking it.

Examples: Out-of-bounds pointer created, but not dereferenced

kazcw

#!/bin/sh

# Distinguishes B0 from C0. Likely won't distinguish C0 from whatever comes next.

SD=$(od -An -tx1 -w24 /proc/device-tree/emmc2bus/dma-ranges | tr -d ' ')

if [ $SD = 00000000c0000000000000000000000040000000 ]; then echo B0; exit; fi
if [ $SD = 00000000000000000000000000000000fc000000 ]; then echo C0; exit; fi
echo '??'