msullivan

void reboot(void)
{

	while (1) { /* keep trying if it doesn't work */
		/* wait for the output buffer to be empty */
		while (inb(KEYBOARD_CMD_PORT) & KEYBOARD_OUTBUF_FULL_MASK)
			;
		/* send the command to have the keyboard controller reboot the machine.
		 * wtf. */
		outb(KEYBOARD_CMD_PORT, KEYBOARD_CMD_REBOOT);

msullivan

// clang++ --std=c++11 clang-crash.cpp

template<typename F>
auto foo(F f) -> decltype(f()) { }

void bar() {
    foo([&]() { return *bogus; });
}

msullivan

#!/bin/sh

if pgrep unity-settings > /dev/null; then
    exit
fi

xsetroot -solid black
# sleeps: evade, don't solve, concurrency problems
unity-settings-daemon& sleep 1;
wmdocker & sleep 1

msullivan

// This compiles without error on stable and beta but gives a borrow
// error on nightly. It worked as of nightly 6e5a32547.

// Replacing the .by_ref() with explicitly taking a &mut ref fixes it.
// Other more dubious things fix it also.

pub type Session = i32;

pub struct StreamParser<'a, T: Iterator<Item=i32>> {
    _tokens: T,

msullivan

#!/usr/bin/env python3

# Michael J. Sullivan (http://www.msully.net/)

# Stupid little script to make gnome/unity media keys work when running
# weirdo window managers like xmonad and notion.
# Directions:
# With unity-settings-daemon running, run this script in the background.

# Tested on Ubuntu 15.04 using notion.

msullivan

// This code is all kinds of illegal and tests whether other threads
// keep running while there is an outstanding vfork

#include <atomic>
#include <thread>
#include <iostream>
#include <unistd.h>

std::atomic<bool> child_running;
std::atomic<bool> child_signaled;

msullivan

let time_execution func =
  let start_time = Sys.time () in
  let ret = func () in
  let end_time = Sys.time () in
  end_time -. start_time, ret
(* val time_execution : (unit -> 'a) -> float * 'a *)

let print_stuff () = Printf.printf "hello, world\n"
let compute_stuff () = 10 + 10

msullivan

// Copying variables into a tmp using __typeof__ is a common
// pattern in hacky gcc C macros, but it can backfire and
// allow the value to be evaluated twice!
// This is because __typeof__ will evaluate its argument if
// the value has a variably sized type!
// gcc added __auto_type to get around this problem in its stdatomic.h, but I'm
// not losing any sleep over this.

// See http://patchwork.ozlabs.org/patch/290802/

msullivan

// Make a copy of a value that the compiler doesn't know anything about.
#define launder_value(v) \
    ({                                           \
    __typeof__(v) __v = v;                       \
    __asm__ __volatile__("" : "+r" (__v)::);     \
    __v;                                         \
    })

msullivan

import Control.Monad

type Var = Integer
type Subst = [(Var, Term)]
type State = (Subst, Integer)
type Program = State -> KList State

data Term = Atom String | Pair Term Term | Var Var deriving Show

-- Apply a substitution to the top level of a term