vi’s gists

vi / genetic_regex.pl

Created November 24, 2014 11:42

Generate regular expressions using genetic algorithm.

	#!/usr/bin/perl -w

	use strict;

	$\|=1;

	if ($#ARGV != 3) {
	print STDERR "Usage: genetic_regex.pl file_with_passing_lines file_with_failing_lines {file_with_hints\|''} {file_with_bans\|''} \n";
	print STDERR "Created by Vitaly '_Vi' Shukela, in 2014. License is LGPLv2+.\n";
	exit 1;

vi / genregex.log

Last active August 29, 2015 14:10

Log for finding the http://codegolf.stackexchange.com/a/41814/7773

vi / directfbtext.c

Created November 26, 2014 23:23

DirectFB simple text outputter

	/*
	directfbtext, implemented by Vitaly "_Vi" Shukela in 2014.

	Based on:

	DirectFB Tutorials

	(c) Copyright 2000-2002 convergence integrated media GmbH.
	(c) Copyright 2002 convergence GmbH.
	All rights reserved.

vi / copy_with_links

Created December 18, 2014 16:20

Copy a file with accompanying symlinks

	#!/bin/bash

	if [ -z "$2" ]; then
	echo "Usage: copy_with_links one_or_more_source_files target_directory/"
	exit 1
	fi

	set -e

	f=("$@")

vi / hash_.cpp

Created June 9, 2015 16:19

	#include <stdio.h>

	void hash(const unsigned char* buf, size_t len, unsigned long long hash1, unsigned long long hash2)
	{
	unsigned long long &h=*hash1;
	unsigned long long &j=*hash2;
	size_t l = len;
	const unsigned char* b = buf;

	h=0xC0CC3051F486B191;

vi / bpg93_remove_alpha.pl

Last active October 21, 2015 10:17

Alpha channel remover from old BPG pictures

	#!/usr/bin/perl

	# Removes alpha channel from BPG v0.9.3- image, so it can be decoded with libbpg v0.9.4+.
	# Implemented by Vitaly "_Vi" Shukela in 2015
	# License: MIT

	read STDIN,$_,4;
	my $magic=unpack("N", $_);
	printf STDERR "magic: %08X\n", $magic;
	print STDOUT pack("N", $magic);

vi / cgroup_memory_pressure_monitor.c

Created July 19, 2015 22:51

Simple command-line tool use cgroup's memory.pressure_level

	#include <sys/eventfd.h>
	#include <unistd.h>
	#include <stdlib.h>
	#include <stdio.h>
	#include <stdint.h>
	#include <string.h>
	#include <errno.h>
	#include <fcntl.h>

	// Implemented by Vitaly "_Vi" Shukela in 2015, License=MIT.

vi / vmtouchpoll

Last active April 9, 2019 06:04

Keep files locked in memory by periodically restarting vmtouch

	#!/bin/bash

	# vmtouchpoll: Keep some files locked in memory (including new files, dropping deleted files)

	# Usage: vmtouchpoll '/path/to/some/files/*.idx'

	# Works by periodically restarting vmtouch with a new set of files
	# Implemented by Vitaly "_Vi" Shukela in 2015, License=MIT

vi / selectfuzz.c

Created July 22, 2015 22:25

Intentionally cause select/poll spurious activations for testing, LD_PRELOAD-based

vi / inhibitseekfail.c

Created July 22, 2015 22:28

Inhibit seek failures to force programs to continue when writing to pipes/sockets, LD_PRELOAD-based

	#define _GNU_SOURCE 1
	#include <stdio.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <sys/types.h>
	#include <dlfcn.h>
	#include <errno.h>

	static int (*orig_llseek)(
	unsigned int fd, unsigned long offset_high,

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