skull-squadron

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skull-squadron

How to correctly use a hardware random number generator (hwrng, trng) on Linux 5+ (Debian 12+)

Problem

1. Linux entropy pool doesn't know about external, non-default, non-driver entropy sources.
2. Modern Linux usually reports 256 for cat /proc/sys/kernel/random/entropy_avail. This has to do with the entropy pool rewrite sometime ago that prevented blocking of /dev/random.
3. There is presently no userland entropy pool seeding "pull" mechanism.

Solution

skull-squadron

diff --git a/installwatch/installwatch.c b/installwatch/installwatch.c
index 15cb75c..77189dc 100644
--- a/installwatch/installwatch.c
+++ b/installwatch/installwatch.c
@@ -157,6 +157,20 @@ static int (*true_unlinkat)(int, const char *, int);
 	#define inline
 #endif	
 
+#ifndef _STAT_VER
+	#if defined (__aarch64__)

skull-squadron

/*                                                                           */
/*                           PAGEDEMO.C                                      */
/*                                                                           */
/*   There is a nonstandard 320x400 256 color VGA mode which has two pages.  */
/*   This program demonstrates its use by setting up the mode, drawing to    */
/*   the two pages, and flipping the pages for instanteous appearance of     */
/*   of the graphics.                                                        */
/*                                                                           */
/*   A scanline function is included which shows how to take advantage of    */
/*   memory plane masking to draw four pixels simutaneously.                 */

skull-squadron

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

typedef uint64_t n;

n sqrt_n(n x) {
  if (x <= 1) return x;

skull-squadron

// Specialize stack to work with forward_list (STL singly-linked lists)

// Notes:
// - This is a proof-of-concept as an exercise for template specialization. Don't use in production!
// - Not cache-efficient.
// - Use stack<T, vector<T>> most of the time instead.

// Output
// ======
// t:

skull-squadron

0. brew install ncurses ruby

1. gem install curses -- --use-system-libraries --with-ncurses-dir="$(brew --prefix ncurses)" --with-cflags='-Wno-error=incompatible-pointer-types'

This is because the Ruby maintainers are hipsters unable to work effectively with reality and Clang/LLVM breaking everyone's shit.

skull-squadron

Auto Ethernet/Wi-Fi switching script for macOS

! CRITICAL PROBLEM ! Currently broken because ...../airport -z no longer functions and the replacement is uncertain and nonexistent for now

Installation

1. Add local.auto-switch-wifi-ethernet.zsh to /usr/local/sbin
2. Add local.auto-switch-wifi-ethernet.plist to /Library/LaunchDaemons
3. Create /usr/local/.home.wifi.ssid containing the Wi-Fi network name (SSID) to try to connect to when Ethernet is no longer internet reachable
4. Start it permanently sudo launchctl unload -w /Library/LaunchDaemons/local.auto-switch-wifi-ethernet.plist

skull-squadron

1. brew edit node@18
2. Insert ENV["CXXFLAGS"] = "-Wno-enum-constexpr-conversion" after ENV["PYTHON"] = ...
3. brew install node@18
4. Profit!

Notes:

• i. Don't bother reporting this to homebrew because it has severely unprofessional contributors.
• ii. Clang/LLVM people insist on breaking all software and systems for idealological purity.
• iii. Node people refuse to take ownership of this.

skull-squadron

#ifndef LIBC_BITS_H
#define LIBC_BITS_H

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <float.h>
#include <limits.h>
#include <locale.h>
#include <math.h>