ben-cohen

/*
 * shared_mutex: Mutex in mmap memory shared between processes.
 *
 * Ben Cohen, July 2017.
 *
 * Compile using:
 *    gcc -o shared_mutex shared_mutex.c -ggdb -Wall -std=c99 -pthread
 *
 * Two processes are created with an mmap shared memory region
 * containing an array of chars and a mutex.  The mutex is created with

ben-cohen

#!/usr/bin/python
#
# Ben Cohen, October 2017.
#
# mouse_motion.py: Display "breadcrumb trail" to test mouse motion events.
#
# Move the mouse and the positions of the motion events will be displayed.
# Clear the canvas by pressing Backspace.  Quit by pressing Escape.

import sys

ben-cohen

#!/bin/sh
#
# Git post-commit hook to create a branch automatically when commiting from a
# detached HEAD.
#
# Install in your repo as .git/hooks/post-commit and make it executable.
#
# Ben Cohen, December 2017.

set -e

ben-cohen

/* 
 * ptrace_without_exec: Ptrace child process without calling exec()
 *
 * Compile using:
 *     gcc -o ptrace_without_exec ptrace_without_exec.c -ggdb -Wall
 *
 * Ben Cohen, May 2018.
 */

#include <unistd.h>

ben-cohen

#
# GDB Python pretty printer for the int datatype to Roman Numerals
#
# Ben Cohen, June 2019
#

import gdb

# GDB pretty printer for the "int" type
class IntPrinter:

ben-cohen

#
# GDB Python unwinder and frame decorator prototype
#
# This is a very basic demonstration for how to get GDB to unwind the
# "frametest" example crash in https://github.com/ben-cohen/corelibgen and
# apply a frame decorator to the backtrace.
#
# It needs a recent version of gdb and only works on i386 or x86_64.
# You need to manually fill in the PC value of the crash at "XXX" below!
#

ben-cohen

#!/bin/bash
#
# fontlist.sh: Create a XeLaTeX document giving samples for each of the fonts
# available to the local system from fc-list, and run XeLaTeX on it ignoring
# errors.
#
# Ben Cohen, August 2020.
#

OUTFILE=fontlist.tex

ben-cohen

%
% A LaTeX document where images called img-1.jpg, img-2.jpg, ... are
% displayed in the corner of the page instead of a textual page number.
%
% Ben Cohen, November 2020
%

\documentclass{article}
\usepackage{lipsum}
\usepackage{graphicx}

ben-cohen

#!/bin/bash

# usage: diffpdf.sh file_1.pdf file_2.pdf

# requirements:
# - ImageMagick
# - Poppler's pdftoppm and pdfinfo tools (works with 0.18.4 and 0.41.0,
#                                         fails with 0.42.0)
#   (could be replaced with Ghostscript if speed is
#    not important - see commented commands below)

ben-cohen

#!/bin/bash
#
# git_check_status.sh: check whether git is in a special state
#
# Ben Cohen, July 2021
#
# This script returns failure if the current directory is a git worktree
# that is in a special state - merge, rebase, bisect or detached HEAD - or
# returns success if the worktree is in a normal state, or the current
# directory is not a git worktree.