Heading for a Record: Chromium, the 5th CheckPVS-Studio
We checked Chromium more than once before, and those who follow our blog could reasonably ask, "Why another check? Weren't there enough of them?" Sure, Chromium's source code is particularly clean, which was shown by each of the previous checks, but new errors inevitably continue to appear. Repeated checks prove that the more often you use static analysis, the better. A good practice is to use the analyzer every day. An even better practice is to analyze the new code right after you finish writing it (automatic analysis of recently modified code).
This document discusses RuntimeUnitTestToolkit, a tool for running unit tests on IL2CPP games. It allows creating unit test classes with public methods that will be automatically registered as tests. Tests can make assertions using the Is method and can be asynchronous by returning IEnumerator. It works with UniRx and allows testing asynchronous coroutines. The tool focuses on play time testing and supports running tests on actual devices.
LibreOffice uses Oss-Fuzz, crash testing, and Coverity for testing. Oss-Fuzz finds over 100 issues per year through continuous fuzzing of import filters. Crash testing imports over 100,000 documents and reports failed imports/exports. Coverity scans C++ and Java code to detect defects like uninitialized variables.
The document provides instructions for installing Ruby on Rails in Linux using either yum or apt. It describes general rules for Linux installations and alternatives like yum and apt for package management. The yum section outlines 7 steps for installing Ruby on Rails using yum, including installing Ruby, RubyGems, Rails, and MySQL. The apt section lists 3 commands for installing Ruby and related packages using apt.
Kees Cook works to keep the Ubuntu operating system secure. His responsibilities include finding new vulnerabilities, checking mailing lists for reports of issues, performing code audits, triaging vulnerabilities by priority, finding or developing patches, testing patches, and publishing updated packages. He discussed various types of software vulnerabilities and mitigation strategies used in Ubuntu to improve security.
Vagrant allows users to configure and manage virtual machine environments through files and commands. It uses configuration files to define VMs and provisioning tools to automate software installation. Key features include:
- Managing virtual machines from a Vagrantfile configuration
- Provisioning VMs through tools like Chef and Ansible
- Accessing VMs through SSH using the vagrant command
- Installing plugins to add functionality like AWS integration
This document provides an overview of tools for effective data manipulation including GNU Emacs, the BASH shell, and Ruby. It discusses how GNU Emacs can be used for powerful text editing and file manipulation through keyboard macros and mode-specific commands. The BASH shell and variables are summarized as useful for file manipulation and applying UNIX commands. Ruby is presented as a scripting language well-suited for directly processing file contents, with an example provided to select and rearrange fields from a comma-separated file. References for further learning about these tools are also listed.
The document provides an introduction to using the Linux shell. It explains that the shell is a program that takes commands from the user and gives them to the operating system to perform. While graphical user interfaces are common, the shell allows users to access the full power of Linux. It then demonstrates basic shell commands like pwd, ls, and cd. Finally, it walks through compiling a simple "Hello World" C program using the gcc compiler by navigating directories, compiling with gcc, and running the output executable file.
Heading for a Record: Chromium, the 5th CheckPVS-Studio
We checked Chromium more than once before, and those who follow our blog could reasonably ask, "Why another check? Weren't there enough of them?" Sure, Chromium's source code is particularly clean, which was shown by each of the previous checks, but new errors inevitably continue to appear. Repeated checks prove that the more often you use static analysis, the better. A good practice is to use the analyzer every day. An even better practice is to analyze the new code right after you finish writing it (automatic analysis of recently modified code).
This document discusses RuntimeUnitTestToolkit, a tool for running unit tests on IL2CPP games. It allows creating unit test classes with public methods that will be automatically registered as tests. Tests can make assertions using the Is method and can be asynchronous by returning IEnumerator. It works with UniRx and allows testing asynchronous coroutines. The tool focuses on play time testing and supports running tests on actual devices.
LibreOffice uses Oss-Fuzz, crash testing, and Coverity for testing. Oss-Fuzz finds over 100 issues per year through continuous fuzzing of import filters. Crash testing imports over 100,000 documents and reports failed imports/exports. Coverity scans C++ and Java code to detect defects like uninitialized variables.
The document provides instructions for installing Ruby on Rails in Linux using either yum or apt. It describes general rules for Linux installations and alternatives like yum and apt for package management. The yum section outlines 7 steps for installing Ruby on Rails using yum, including installing Ruby, RubyGems, Rails, and MySQL. The apt section lists 3 commands for installing Ruby and related packages using apt.
Kees Cook works to keep the Ubuntu operating system secure. His responsibilities include finding new vulnerabilities, checking mailing lists for reports of issues, performing code audits, triaging vulnerabilities by priority, finding or developing patches, testing patches, and publishing updated packages. He discussed various types of software vulnerabilities and mitigation strategies used in Ubuntu to improve security.
Vagrant allows users to configure and manage virtual machine environments through files and commands. It uses configuration files to define VMs and provisioning tools to automate software installation. Key features include:
- Managing virtual machines from a Vagrantfile configuration
- Provisioning VMs through tools like Chef and Ansible
- Accessing VMs through SSH using the vagrant command
- Installing plugins to add functionality like AWS integration
This document provides an overview of tools for effective data manipulation including GNU Emacs, the BASH shell, and Ruby. It discusses how GNU Emacs can be used for powerful text editing and file manipulation through keyboard macros and mode-specific commands. The BASH shell and variables are summarized as useful for file manipulation and applying UNIX commands. Ruby is presented as a scripting language well-suited for directly processing file contents, with an example provided to select and rearrange fields from a comma-separated file. References for further learning about these tools are also listed.
The document provides an introduction to using the Linux shell. It explains that the shell is a program that takes commands from the user and gives them to the operating system to perform. While graphical user interfaces are common, the shell allows users to access the full power of Linux. It then demonstrates basic shell commands like pwd, ls, and cd. Finally, it walks through compiling a simple "Hello World" C program using the gcc compiler by navigating directories, compiling with gcc, and running the output executable file.
This document provides an overview of the Perl programming language. It discusses scalars, arrays, hashes, references, subroutines, packages, warnings, strictness, password encryption, file handling, command line arguments, and process management in Perl. Specific topics covered include using @ and $ prefixes for arrays and scalars, accessing elements of arrays and hashes, defining and calling subroutines, using crypt() for password hashing, opening/writing/reading files, and using fork() to create child processes. Examples of code are provided to demonstrate many of these Perl concepts.
This document discusses the basics of writing shell scripts in Linux. It covers:
- Stringing multiple commands together in a shell script by placing them on separate lines.
- Creating a script file with the #!/bin/bash line to specify the shell, and adding commands and comments.
- Ensuring the script file is executable by using chmod.
- Using echo to display messages and strings, including proper use of quotes.
Workflow story: Theory versus Practice in large enterprises by Marcin PiebiakNETWAYS
Uphill battle against large enterprise it environments and IT corporate culture. How those difficulties turned out opportunities and clever implementations. Interesting modules, integrations and workflow pieces.
LibreSSL is a version of the TLS/crypto stack forked from OpenSSL in 2014, with goals of modernizing the codebase, improving security, and applying best practice development processes.
Primary development occurs inside the OpenBSD source tree with the usual care the project is known for. On a regular basis the code is re-packaged for portable use by other operating systems.
I am Burrows N. I am an Operating System Assignment Expert at programminghomeworkhelp.com. I hold a PhD. in Programming from, University Of Chicago, USA. I have been helping students with their homework for the past 4 years. I solve assignments related to Operating systems.
Visit programminghomeworkhelp.com or email support@programminghomeworkhelp.com.
You can also call on +1 678 648 4277 for any assistance with Operating System Assignments.
This document provides instructions for installing various development tools on Mac OSX, including Xcode, command line tools, Homebrew, Ruby, Python, VirtualBox, Vagrant, Chef, and Ansible. It describes downloading and installing each tool, and in some cases providing additional configuration steps or notes on cleaning up existing installations. The overall purpose is to set up a standard development environment with common utilities.
Presentation for building a small Contact app. Shows how to use Typescript and Angular 1.6.
Github Repository:
https://github.com/ymeirovich/Angular-1.6-Typescript-Contact-App
Was Java-Entwickler schon lange nutzen und nicht mehr missen wollen, findet immer
mehr, wenn auch skeptischen, Zuspruch in der PHP Entwicklergemeinde. Integrierte
Enticklungsumgebungen (IDEs), wie Eclipse und Netbeans, werden immer beliebter in der
PHP Szene. Dies sind nicht zuletzt die hervorragenden Vorteile, wie eine automatische
Codevervollständigung oder ein Vererbungsbaum, die eine IDE mit sich bringt, schuld.
Jedoch, es ist nicht alles Gold, was glänzt.
Wenn man sich dazu entschlieflt eine IDE zu nutzen, stellt man schnell fest, dass auch
diese so ihre Eigenheiten hat, auf die man sich einstellen muss.
Dieser Workshop wird Ihnen den Um- und Einstieg in die qualifizierte und effektive
Nutzung integrierter Entwicklungssysteme nahe bringen.
Am Beispiel der Eclipse IDE für PHP Entwicklung (Eclipse PDT 2.0), werden Ihnen der
grundsätzliche Aufbau und Funktionsweisen erklärt. Darüberhinaus zeigt der Workshop,
die Installation, Konfiguration und die Erweiterungsmöglichkeiten der Eclipse IDE.
Im Detail werden Ihnen die Integration von phpDokumentor und xDebug in die
Entwicklungsumgebung gezeigt.
Das Ziel dieses Workshops ist es, Sie fit für Ihre tägliche Arbeit zu machen, deshalb
wird Ihnen herzlich angeraten ihren Laptop mit zubringen, um bereitgestellte Übungen
nachvollziehen und durchführen zu können. Um zeitraubenden Installationen vorzubeugen
wird Ihnen ein Ubuntu in Form eines VMware-oder Virtualbox-Images bereitgelegt.
Teilnehmer mit bestehender Linux-Installation und entsprechenden Rechten können ihr
System während des Workshops direkt für den täglichen Gebrauch einrichten.
Linux provides powerful multiplexing capabilities through file descriptors and APIs like epoll. Multiplexing allows a single thread to handle multiple I/O operations simultaneously. File descriptors can represent network sockets, pipes, timers, signals and more. The epoll API in particular provides efficient waiting on large numbers of file descriptors in kernel space. This allows applications to achieve high concurrency with fewer threads than alternative approaches like multi-threading.
This document discusses shell scripting for Oracle professionals. It begins with the author's background and credentials in database administration and shell scripting. It then covers topics to be discussed, including when to use scripts, scripting basics, connecting to Oracle from scripts, useful scripting techniques, troubleshooting, and examples of scripts. The document provides guidance on determining what tasks are good candidates for scripts, the basics of writing scripts, using variables and comments, and other programming elements needed to get started with shell scripting.
This document provides an overview of shell programming and the Unix command line interface. It defines a shell as the command interpreter that interfaces with the operating system, allowing users to type commands. It recommends starting with the bash shell and provides tutorials on shell scripting basics like variables, command flow, I/O redirection, and configuration files. The document also lists many common Unix commands and tools for text manipulation that shell programmers should learn.
This document contains notes from a PHP extensions workshop. It introduces Julien Pauli, the workshop presenter, and outlines what attendees should bring and know, such as C skills and a Linux environment. The document then covers various topics around PHP extensions, including compiling PHP with debugging, creating an extension skeleton, extension APIs and versions, memory management using Zend Memory Manager, and working with zvals (PHP variables). Attendees will learn how to create, build, and load their first PHP extension.
The document contains a list of 31 lab exercises for a UNIX class, including tasks to list environment variables and shells, edit profile files, create aliases, manage processes, and use commands like ls, grep, sort, and jobs. It instructs students to complete tasks like changing login prompts, redirecting command output to files, running commands in the background, and killing their own processes. The document is from the UNIX Department of the Information Technology Institute in Giza, Egypt.
Vagrant is a well-known tool for creating development environments in a simple and consistent way. Since we adopted in our organization we experienced several benefits: lower project setup times, better shared knowledge among team members, less wtf moments ;-)
In this session I'd like to share our experience, including but not limited to:
- advanced vagrantfile configuration
- vm configuration tips for dev environment: performance, debug, tuning
- our wtf moments
- puphet/phansilbe: hot or not?
- tips for sharing a box
This document discusses using Eclipse Equinox framework extensions to customize and integrate existing OSGi bundles at runtime without modifying their source code. It describes using XSLT transforms to modify plugin.xml definitions, and AspectJ weaving to suppress method calls or access internals. While this allows customizing bundles without access to their APIs, it breaks information hiding and relies on internal implementation details, requiring coping with changes across versions. The approach shifts responsibility from bundle vendors to those doing the integration work.
This document discusses using BitTorrent on iOS. It provides an overview of BitTorrent, including its history, usage statistics, and technical details. It then discusses challenges with using BitTorrent on iOS and potential solutions, including using the libtorrent C++ library. It covers how to build and configure libtorrent for iOS, and how to interface it with Swift. It also describes how to implement an event loop to fetch torrent updates and progress. Some caveats mentioned are the need for fine-tuning to avoid heavy battery usage and lack of background session support on iOS.
Raphaël Pinson's talk on "Configuration surgery with Augeas" at PuppetCamp Geneva '12. Video at http://youtu.be/H0MJaIv4bgk
Learn more: www.puppetlabs.com
This document provides an overview of shell scripting, cron, and atd for scheduling tasks on Linux systems. It discusses using shell scripts to automate commands, the cron daemon for executing commands on a schedule, and atd for running one-time jobs. Key points covered include using the shebang to directly execute shell scripts, crontab syntax for defining schedules, and commands like crond, at, atq and atrm for managing cron and at jobs. The document is intended as a learning resource for system administration tasks using scheduling utilities in Linux.
Дмитрий Копляров , Потокобезопасные сигналы в C++Sergey Platonov
Распространённые подходы к реализации сигналов (boost, Qt) удобны в однопоточном окружении, но, к сожалению, имеют два недостатка при использовании из нескольких потоков: 1. Нет возможности атомарно подключиться к сигналу и получить текущее состояние объекта. 2. Отключение от сигнала плохо совместимо с идиомой RAII. В результате, “очевидный” код приводит к race condition’ам и обращениям к разрушенным объектам, а “правильный” подразумевает сложные схемы владения (shared_from_this, либо введение функционально избыточных объектов).
В докладе я расскажу об альтернативной реализации сигналов, лишённой этих недостатков, и объясню на примерах её преимущества перед boost::signals2.
This document provides an overview of the Perl programming language. It discusses scalars, arrays, hashes, references, subroutines, packages, warnings, strictness, password encryption, file handling, command line arguments, and process management in Perl. Specific topics covered include using @ and $ prefixes for arrays and scalars, accessing elements of arrays and hashes, defining and calling subroutines, using crypt() for password hashing, opening/writing/reading files, and using fork() to create child processes. Examples of code are provided to demonstrate many of these Perl concepts.
This document discusses the basics of writing shell scripts in Linux. It covers:
- Stringing multiple commands together in a shell script by placing them on separate lines.
- Creating a script file with the #!/bin/bash line to specify the shell, and adding commands and comments.
- Ensuring the script file is executable by using chmod.
- Using echo to display messages and strings, including proper use of quotes.
Workflow story: Theory versus Practice in large enterprises by Marcin PiebiakNETWAYS
Uphill battle against large enterprise it environments and IT corporate culture. How those difficulties turned out opportunities and clever implementations. Interesting modules, integrations and workflow pieces.
LibreSSL is a version of the TLS/crypto stack forked from OpenSSL in 2014, with goals of modernizing the codebase, improving security, and applying best practice development processes.
Primary development occurs inside the OpenBSD source tree with the usual care the project is known for. On a regular basis the code is re-packaged for portable use by other operating systems.
I am Burrows N. I am an Operating System Assignment Expert at programminghomeworkhelp.com. I hold a PhD. in Programming from, University Of Chicago, USA. I have been helping students with their homework for the past 4 years. I solve assignments related to Operating systems.
Visit programminghomeworkhelp.com or email support@programminghomeworkhelp.com.
You can also call on +1 678 648 4277 for any assistance with Operating System Assignments.
This document provides instructions for installing various development tools on Mac OSX, including Xcode, command line tools, Homebrew, Ruby, Python, VirtualBox, Vagrant, Chef, and Ansible. It describes downloading and installing each tool, and in some cases providing additional configuration steps or notes on cleaning up existing installations. The overall purpose is to set up a standard development environment with common utilities.
Presentation for building a small Contact app. Shows how to use Typescript and Angular 1.6.
Github Repository:
https://github.com/ymeirovich/Angular-1.6-Typescript-Contact-App
Was Java-Entwickler schon lange nutzen und nicht mehr missen wollen, findet immer
mehr, wenn auch skeptischen, Zuspruch in der PHP Entwicklergemeinde. Integrierte
Enticklungsumgebungen (IDEs), wie Eclipse und Netbeans, werden immer beliebter in der
PHP Szene. Dies sind nicht zuletzt die hervorragenden Vorteile, wie eine automatische
Codevervollständigung oder ein Vererbungsbaum, die eine IDE mit sich bringt, schuld.
Jedoch, es ist nicht alles Gold, was glänzt.
Wenn man sich dazu entschlieflt eine IDE zu nutzen, stellt man schnell fest, dass auch
diese so ihre Eigenheiten hat, auf die man sich einstellen muss.
Dieser Workshop wird Ihnen den Um- und Einstieg in die qualifizierte und effektive
Nutzung integrierter Entwicklungssysteme nahe bringen.
Am Beispiel der Eclipse IDE für PHP Entwicklung (Eclipse PDT 2.0), werden Ihnen der
grundsätzliche Aufbau und Funktionsweisen erklärt. Darüberhinaus zeigt der Workshop,
die Installation, Konfiguration und die Erweiterungsmöglichkeiten der Eclipse IDE.
Im Detail werden Ihnen die Integration von phpDokumentor und xDebug in die
Entwicklungsumgebung gezeigt.
Das Ziel dieses Workshops ist es, Sie fit für Ihre tägliche Arbeit zu machen, deshalb
wird Ihnen herzlich angeraten ihren Laptop mit zubringen, um bereitgestellte Übungen
nachvollziehen und durchführen zu können. Um zeitraubenden Installationen vorzubeugen
wird Ihnen ein Ubuntu in Form eines VMware-oder Virtualbox-Images bereitgelegt.
Teilnehmer mit bestehender Linux-Installation und entsprechenden Rechten können ihr
System während des Workshops direkt für den täglichen Gebrauch einrichten.
Linux provides powerful multiplexing capabilities through file descriptors and APIs like epoll. Multiplexing allows a single thread to handle multiple I/O operations simultaneously. File descriptors can represent network sockets, pipes, timers, signals and more. The epoll API in particular provides efficient waiting on large numbers of file descriptors in kernel space. This allows applications to achieve high concurrency with fewer threads than alternative approaches like multi-threading.
This document discusses shell scripting for Oracle professionals. It begins with the author's background and credentials in database administration and shell scripting. It then covers topics to be discussed, including when to use scripts, scripting basics, connecting to Oracle from scripts, useful scripting techniques, troubleshooting, and examples of scripts. The document provides guidance on determining what tasks are good candidates for scripts, the basics of writing scripts, using variables and comments, and other programming elements needed to get started with shell scripting.
This document provides an overview of shell programming and the Unix command line interface. It defines a shell as the command interpreter that interfaces with the operating system, allowing users to type commands. It recommends starting with the bash shell and provides tutorials on shell scripting basics like variables, command flow, I/O redirection, and configuration files. The document also lists many common Unix commands and tools for text manipulation that shell programmers should learn.
This document contains notes from a PHP extensions workshop. It introduces Julien Pauli, the workshop presenter, and outlines what attendees should bring and know, such as C skills and a Linux environment. The document then covers various topics around PHP extensions, including compiling PHP with debugging, creating an extension skeleton, extension APIs and versions, memory management using Zend Memory Manager, and working with zvals (PHP variables). Attendees will learn how to create, build, and load their first PHP extension.
The document contains a list of 31 lab exercises for a UNIX class, including tasks to list environment variables and shells, edit profile files, create aliases, manage processes, and use commands like ls, grep, sort, and jobs. It instructs students to complete tasks like changing login prompts, redirecting command output to files, running commands in the background, and killing their own processes. The document is from the UNIX Department of the Information Technology Institute in Giza, Egypt.
Vagrant is a well-known tool for creating development environments in a simple and consistent way. Since we adopted in our organization we experienced several benefits: lower project setup times, better shared knowledge among team members, less wtf moments ;-)
In this session I'd like to share our experience, including but not limited to:
- advanced vagrantfile configuration
- vm configuration tips for dev environment: performance, debug, tuning
- our wtf moments
- puphet/phansilbe: hot or not?
- tips for sharing a box
This document discusses using Eclipse Equinox framework extensions to customize and integrate existing OSGi bundles at runtime without modifying their source code. It describes using XSLT transforms to modify plugin.xml definitions, and AspectJ weaving to suppress method calls or access internals. While this allows customizing bundles without access to their APIs, it breaks information hiding and relies on internal implementation details, requiring coping with changes across versions. The approach shifts responsibility from bundle vendors to those doing the integration work.
This document discusses using BitTorrent on iOS. It provides an overview of BitTorrent, including its history, usage statistics, and technical details. It then discusses challenges with using BitTorrent on iOS and potential solutions, including using the libtorrent C++ library. It covers how to build and configure libtorrent for iOS, and how to interface it with Swift. It also describes how to implement an event loop to fetch torrent updates and progress. Some caveats mentioned are the need for fine-tuning to avoid heavy battery usage and lack of background session support on iOS.
Raphaël Pinson's talk on "Configuration surgery with Augeas" at PuppetCamp Geneva '12. Video at http://youtu.be/H0MJaIv4bgk
Learn more: www.puppetlabs.com
This document provides an overview of shell scripting, cron, and atd for scheduling tasks on Linux systems. It discusses using shell scripts to automate commands, the cron daemon for executing commands on a schedule, and atd for running one-time jobs. Key points covered include using the shebang to directly execute shell scripts, crontab syntax for defining schedules, and commands like crond, at, atq and atrm for managing cron and at jobs. The document is intended as a learning resource for system administration tasks using scheduling utilities in Linux.
Дмитрий Копляров , Потокобезопасные сигналы в C++Sergey Platonov
Распространённые подходы к реализации сигналов (boost, Qt) удобны в однопоточном окружении, но, к сожалению, имеют два недостатка при использовании из нескольких потоков: 1. Нет возможности атомарно подключиться к сигналу и получить текущее состояние объекта. 2. Отключение от сигнала плохо совместимо с идиомой RAII. В результате, “очевидный” код приводит к race condition’ам и обращениям к разрушенным объектам, а “правильный” подразумевает сложные схемы владения (shared_from_this, либо введение функционально избыточных объектов).
В докладе я расскажу об альтернативной реализации сигналов, лишённой этих недостатков, и объясню на примерах её преимущества перед boost::signals2.
Руслан Муллахметов, Открытый и неинтрузивный менеджер зависимостей для С++Sergey Platonov
Одной из наиболее признанных и хорошо-известных проблем С++ является проблема доставки внешних зависимостей. В докладе очерчиваются проблемы доставки зависимостей, рассматриваются распространенные пути решения и их связи с системами сборки. Предлагается неинтруизивный подход в построении менеджера зависимостей для С/С++ и с обсуждением <a>cdist</a> в качестве модельной реализации данного подхода.
Илья Шишков, Принципы создания тестируемого кодаSergey Platonov
В докладе рассмотрено зачем нужно покрывать код автотестами и почему многие этого до сих пор не делают. Что такое хорошие юнит-тесты и какую пользу они дают помимо собственно тестирования. Три принципа организации кода, упрощающие создание юнит-тестов: закон Деметры, внедрение зависимости и принцип единой ответственности. Каждый принцип разобран на примере, демонстрирующем его применение и получаемые при этом преимущества.
All you need to know about XPath 1.0 in a web scraping project: the different axes, attribute matching, string functions, EXSLT extensions plus a few other handy patterns like CSS selectors and Javascript parsing.
Фитнес для вашего кода: как держать его в формеIlia Shishkov
C++ Россия 2017
Во время моего выступления мы поговорим о принципе "Minimize coupling, maximize cohesion". Обсудим, что это такое и что значат эти непонятные слова. Кроме того на приближенном к реальности примере мы рассмотрим, как, применяя указанный принцип, можно держать ваш код в форме, чтобы он был готов ко всем неожиданностям, которые подстерегают ваш проект в течение его жизни.
This document summarizes an update on searching in Drupal. It discusses improvements to the views user interface for searching, how Drupal's core search works and its SQL, and three patches to improve core search SQL performance. It also briefly mentions other search options like fuzzy search and faceted search. The document focuses on views-based searching and provides an overview of core search indexing, ranking, and queries. It examines the SQL for AND, OR, and exclude queries and proposes solutions to improve performance.
This document provides an overview of the C programming language under Linux, covering preprocessing, compiling, assembling, linking, libraries, and related tools. It discusses:
1. The four main steps of preprocessing, compiling, assembling, and linking using GNU tools like cpp, cc1, as, and collect2.
2. How to display symbol tables using nm and strip symbols from executables.
3. Creating static libraries with ar and ranlib and linking them, as well as creating shared libraries with gcc and soname.
4. The roles of environment variables like LIBRARY_PATH and LD_LIBRARY_PATH in locating libraries.
The Raspberry Pi is a series of credit card–sized single-board computers developed in the UK by the Raspberry Pi Foundation with the intention of promoting the teaching of basic computer science in schools.
The original Raspberry Pi and Raspberry Pi 2 are manufactured in several board configurations through licensed manufacturing agreements with Newark element14 (Premier Farnell), RS Components and Egoman. These companies sell the Raspberry Pi online. Egoman produces a version for distribution solely in China and Taiwan, which can be distinguished from other Pis by their red colouring and lack of FCC/CE marks. The hardware is the same across all manufacturers.
The original Raspberry Pi is based on the Broadcom BCM2835 system on a chip (SoC), which includes an ARM1176JZF-S 700 MHz processor, VideoCore IV GPU, and was originally shipped with 256 megabytes of RAM, later upgraded (models B and B+) to 512 MB. The system has Secure Digital (SD) (models A and B) or MicroSD (models A+ and B+) sockets for boot media and persistent storage.
This document provides release notes and supplementary information for Delphi 7. It notes that some components have been deprecated and recommends newer alternatives. It also describes changes made to string handling functions, warnings added by the compiler, and issues fixed in streaming of subcomponents. Finally, it provides notes on various other topics like Apache, UDDI, Windows XP input, and databases.
The document discusses Node.js and provides instructions for installing Node.js via different methods:
1) Homebrew can be used to install Node.js on OSX by running "brew install node.js".
2) nDistro allows creating and installing Node.js distributions within seconds by specifying module and Node binary version dependencies in a .ndistro file.
3) Node.js can be compiled from source by cloning the Node.js repository via git or downloading the source, running configuration, make, and make install commands.
The document discusses the Mach-O file format used on Mac OS X for compiled programs and libraries. It describes the Mach-O header, load commands, symbols, linking and loading processes. It also demonstrates how to explore Mach-O files using command line tools like otool and graphical tools like Mach-O View. Dynamic linking and the procedure linkage table are explained. Finally, it introduces a Mach-O hooking tool for intercepting function calls at runtime.
Advanced Rational Robot A Tribute (http://www.geektester.blogspot.com)raj.kamal13
This document provides information about Rational Robot testing software including:
1. An advanced course is designed to teach complex automated testing techniques using Rational Robot such as building effective test scripts through best practices.
2. Rational Robot can be used to record, playback, and view logs of test scripts. It also supports different types of header and library files to share code between scripts.
3. Various recording modes, verification points, and clipboard commands are described that allow Rational Robot to test different types of applications in flexible ways.
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BACKGROUND A shell provides a command-line interface for users. I.docxwilcockiris
BACKGROUND
: A shell provides a command-line interface for users. It interprets user commands and executes them. Some shells provide simple scripting terms, such as
if
or
while
, and allow users to make a program that facilitates their computing environment. Under the hood, a shell is just another user program as you know from Minor2 assignment. The file
/bin/bash
is an executable program file for the bash shell. The only thing special about your login shell is that it is listed in your login record so that /bin/login (i.e., the program that prompts you for your password) knows what program to start when you log in. If you run "cat /etc/passwd", you will see the login records of the machine.
PROGRAM DESCRIPTION
GROUP COLLABORATIVE PORTION
: In this assignment, you will implement the shell “engine” as the group component, where all members are responsible for the following functionality.
A Command-Line Interpreter, or Shell
Your shell should read the line from standard input (i.e., interactive mode) or a file (i.e., batch mode), parse the line with command and arguments, execute the command with arguments, and then prompt for more input (i.e., the shell prompt) when it has finished. This is what Minor 2 program should do with addition of batch processing which means just reading a batch line by line and calling the same interpretation logic.
Batch Mode
In batch mode, your shell is started by specifying a batch file on its command line. The batch file contains the list of commands that should be executed. In batch mode, you should not display a prompt, but you should echo each line you read from the batch file back to the user before executing it. After a batch is finished the shell will exit.
Interactive Mode
No parameters specified on command line when the shell is started. In this mode, you will display a prompt (any string of your choice) and the user of the shell will type in a command at the prompt.
You will need to use the fork() and exec() family of system calls. You may not use the system() system call as it simply invokes the system’s /bin/bash shell to do all of the work. You may assume that arguments are separated by whitespace. You do not have to deal with special characters such as ', ", \, etc. You may assume that the command-line a user types is no longer than 512 bytes (including the '\n'), but you should not assume that there is any restriction on the number of arguments to a given command.
INDIVIDUAL PORTIONS
Build-in Commands:
Every shell needs to support a number of built-in commands, which are functions in the shell itself, not external programs. Shells directly make system calls to execute built-in commands, instead of forking a child process to handle them.
In this assignment, each member of the group will implement one of the following section and commit in GitLab the code that supports those commands:
Add a new built-in
alias
command that allows you to define a shortcut for commands by essenti.
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* patterns: the most frequent design patterns and their incarnations
* helpers: the what and the where of helper functionality
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- It describes the structure of sbt's build.sbt file which defines project settings, dependencies, and repositories.
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- Integration of sbt projects with IntelliJ IDEA and Eclipse IDEs is covered, with IDEA having better support and integration with sbt than Eclipse.
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3) Compiled stylesheets that bundle CSS and images into the JavaScript for fewer HTTP requests.
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SWIG is a tool that connects C/C++ code to scripting languages like PHP. It works by taking C/C++ declarations and generating wrapper code. To use SWIG with PHP: 1) Write a SWIG interface file; 2) Run SWIG to generate wrapper code; 3) Compile the wrapper code into a PHP extension. The extension can then be loaded in PHP to access functions defined in the C/C++ code.
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1. Let’s Take A Look At The
Boost Libraries
Seoul System Programmers Network #6
@TomSmartBishop Thomas Pollak
2. Setup Boost (currently v1.61)
Download and unzip (http://www.boost.org/users/download/)
Run bootstrap(.bat|.sh)
Run b2 to generate the libs for your toolchain
Without parameters b2 will try to auto-detect your toolchain
In case you would like to build for another platform or b2 has troubles use --help to
see all options
Libs will be in the sub directory stage/lib, you can move/install everything to the
default locations with b2 install
3. Let’s look at the samples
You can find the source code here:
https://github.com/TomSmartBishop/sspn_06_lets_boost
I picked 7 boost libraries that I found interesting and used some more as little helpers,
but there is much more: http://www.boost.org/users/history/version_1_61_0.html
Most libraries are header only and make heavy use of templates (and macros). Samples
that need library linkage are pointed out on the slides.
Be aware that there s a compile time overhead, also for small samples.
Due to the fact that most boost libraries have different authors the API seems not always
homogenous (however there are core components used across all libs).
Sometimes the API feels sometimes a bit over-engineered but does work as expected
(compared to the STL lib).
In VS2015 /Wall produces a lot warnings so that /W4 seems like a better choice.
4. Boost Program Options
http://www.boost.org/doc/libs/1_61_0/doc/html/program_options.html
In case you are writing a program with command line parameters this is quite useful.
No need to re-implement boring stuff again and again. The github sample uses the
program options also to switch between the other sample implementations.
Needs to be linked against the program_options library.
po::options_description desc("Allowed options");
desc.add_options()
("help", "produce help message")
("compression", po::value<int>(), "set compression level");
po::variables_map vm;
po::store(po::parse_command_line(ac, av, desc), vm);
po::notify(vm);
if (vm.count("help"))
cout << desc << "n";
else if (vm.count("compression"))
cout << "Compression level was set to " << vm["compression"].as<int>() << ".n";
else
cout << "Compression level was not set.n";
5. Boost Any
http://www.boost.org/doc/libs/1_61_0/doc/html/any.html
This behaves more or less what we know from Java and C# as “object”. It uses a
template class to store the exact type you using. Therefore no implicit conversions,
if you assign 5, the type will be an int and if you assign 5.0 it will be a double.
Boost Any is really handy and interestingly has been described in a paper back in
the year 2000, however it’s not part of the STL (would be nice though).
std::vector<boost::any> values;
values.push_back(std::string("Hello"));
values.push_back("World");
values.push_back(42);
values.push_back(3.14f);
6. Boost Variant
http://www.boost.org/doc/libs/1_61_0/doc/html/variant.html
Similar to Any, but Variant accepts only the predefined types. So it looks more like
a union, but without the drawback of a union.
Drawbacks of a union?
You can access a union at any time with any variation, eg. access the a float’s data as an
int and this behavior is not defined in the standard. The standard only specified
subsequent access of the same variant. Interestingly this is supported by most compilers
(at least MSVC, clang, GCC) and is actually used in real world applications to access the
bit representation of floating point number (or similar).
Only POD types allowed, but boost Variant also allows non PODs so we can create a
variant like this: boost::variant< int, std::string > var("hello world");
7. Boost Lexical Cast
http://www.boost.org/doc/libs/1_61_0/doc/html/boost_lexical_cast.html
Convenient type conversion, no more need for atoi or sprintf to convert from
int to string or the other way around.
Supports all fundamental C++ types and much more convenient compared to
std::strtol and similar: int32_t i = lexical_cast<int32_t>("42");
Heap allocation can be avoided if desired (when converting to string).
8. Boost Signals2
http://www.boost.org/doc/libs/1_61_0/doc/html/signals2.html
Callbacks with multiple targets. Comparable with event listeners in Java (without
interfaces).
The callback receivers are called “slots” which are invoked by the “signal”.
struct HelloWorld
{
void operator()() const { cout << "Hello, World!n"; }
};
// Signal with no arguments and a void return value
boost::signals2::signal<void ()> sig;
// Connect a HelloWorld slot
HelloWorld hello;
sig.connect(hello);
// Call all of the slots
sig();
9. Boost Serialization
http://www.boost.org/doc/libs/1_61_0/libs/serialization/doc/index.html
Easy serialization, even though I cannot speak of a large scale experience, the interface
looks good and I couldn’t spot any obvious pitfalls.
Can handle STL containers and as far as I could see also other boost classes like
boost::greogorian::date.
Can restore pointers (serializes the content, not the pointer).
Needs to be linked against the serialization library
(as well as the chrono/date_time library).
Uses RTTI by default, but also can be used without RTTI (with some typing overhead).
10. Boost Compute
http://www.boost.org/doc/libs/1_61_0/libs/compute/doc/html/index.html
Compute is one of the latest additions to boost. In my small samples I also got
two warning during “normal” API usage, which I could fix by myself by doing some
explicit type casts in the library’s header, so it looks like it needs still some time to
really get stable.
However the concept is quite interesting: You can use your GPU to perform
computations and the API let’s you do that in a very convenient way without
worrying about the underlying hardware or compute shaders.
I didn’t perform any tests how much that can speedup operations, so I still need
some more time to play around and explore…