ben-cohen

/*
 * ptrace_test: Set breakpoints and watchpoints on the child process using
 *              ptrace on x86-64 Linux
 *
 * Compile using:
 *    gcc -o ptrace_test ptrace_test.c -Wall -ggdb
 *
 * Ben Cohen, February 2025
 */

ben-cohen

/*
 * sparsedump: Show offsets of holes and data in a possibly sparse file on Linux
 *
 * Compile using:
 *     gcc -o sparsedump sparsedump.c -ggdb -Wall
 *
 * Ben Cohen, February 2025.
 */

/*

ben-cohen

How to set up QEMU to debug the kernel using gdb

1. Install packages that we need. For Ubuntu this includes:

    apt-install git build-essential ncurses-dev xz-utils libssl-dev \
                bc flex libelf-dev bison qemu-system-x86 gdb
   

2. Get the Linux source. (Or use your Linux distribution's package manager to fetch it.)

ben-cohen

#!/usr/bin/python3
#
# Keep the X primary selection and the clipboard
# in sync. Polls regularly and, when one changes,
# it's copied to the other.
#
# To the extent possible under law, Alun Jones has waived all copyright and
# related or neighbouring rights to this work. This work is published from:
# United Kingdom.
#

ben-cohen

#!/usr/bin/python3
#
# pipewinch: Forward a terminal with window size changes across a unix
#            domain socket.
#
# Usage:
#   pipewinch <uds-action> <uds-path> exec ARGS...
#   pipewinch <uds-action> <uds-path> term
# where uds-action is "listen" or "connect"
#

ben-cohen

// window-size-changed.c: Demo program to handle window changed events
//
// Ben Cohen, July 2022.
//

#include <sys/ioctl.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>

ben-cohen

#!/usr/bin/python3
#
# idleterm.py: Open a pty so that a process from elsewhere - such as a gdb
#              inferior - can attach to it and copy the IO between the pty and
#              this process's stdin and stdout.
#
#              This is a Python version of the idleterm program at
#              https://stackoverflow.com/a/71314902/2319122
#
# Ben Cohen, April 2022.

ben-cohen

#!/bin/bash
#
# tmux_pane_wait.sh: Launch an interactive process in a second tmux pane and
# wait for it to complete before continuing the script in the first pane.
#
# Ben Cohen, February 2022.
#
set -x
set -e
if [ -z "$TMUX" ]

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.

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)