Book Image

Hands-On System Programming with Go

By : Alex Guerrieri
Book Image

Hands-On System Programming with Go

By: Alex Guerrieri

Overview of this book

System software and applications were largely created using low-level languages such as C or C++. Go is a modern language that combines simplicity, concurrency, and performance, making it a good alternative for building system applications for Linux and macOS. This Go book introduces Unix and systems programming to help you understand the components the OS has to offer, ranging from the kernel API to the filesystem. You'll then familiarize yourself with Go and its specifications. You'll also learn how to optimize input and output operations with files and streams of data, which are useful tools in building pseudo-terminal applications. You'll gain insights into how processes communicate with each other, and learn about processes and daemon control using signals, pipes, and exit codes. This book will also enable you to understand how to use network communication using various protocols, including TCP and HTTP. As you advance, you'll focus on Go's best feature - concurrency, which will help you handle communication with channels and goroutines, other concurrency tools to synchronize shared resources, and the context package to write elegant applications. By the end of this book, you will have learned how to build concurrent system applications using Go
Table of Contents (24 chapters)
Free Chapter
Section 1: An Introduction to System Programming and Go
Section 2: Advanced File I/O Operations
Section 3: Understanding Process Communication
Section 4: Deep Dive into Concurrency
Section 5: A Guide to Using Reflection and CGO

Introduction to CGO

CGO is the tool that makes it possible to run C code in a Go application. This feature has been around since Go reached version 1.0 in 2009 and allowed us to use existing C libraries when there were fewer packages available outside the standard library than today.

The C code is accessed through the C pseudo package, and it is accessed and called using the package name followed by the identifier, for instance, C.print.

The import declaration is preceded by a series of special comments, which specify what C source file the application should import:

package example

// #include <stdio.h>
import "C"

This statement can also be a multiline comment, which can contain more include directives, like the one from the example earlier, and even actual C code directly:

package example

#include <stdio.h>
#include <stdlib.h>
#include &lt...