- What's an exit code? Who makes use of it?
The exit code is an integer value passed from a process to is parent to signal when the process ends. It represents the outcome of the process, and it is 0 if there have been no errors. The parent process can use this value to decide what to do next, such as running the process again if there is an error. - What happens when an application panics? What exit code is returned?
If panic is not recovered, the application will execute all the deferred functions and will exit with a status of 2. - What's the default behavior of a Go application when receiving all signals?
The default behavior of a Go application with signals is an early exit. - How do you intercept signals and decide how the application must behave?
The signals received can be intercepted using the signal.Notify method on a channel, specifying...
Hands-On System Programming with Go
By :
Hands-On System Programming with Go
By:
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)
Preface
Free Chapter
Section 1: An Introduction to System Programming and Go
An Introduction to System Programming
Unix OS Components
An Overview of Go
Section 2: Advanced File I/O Operations
Working with the Filesystem
Handling Streams
Building Pseudo-Terminals
Section 3: Understanding Process Communication
Handling Processes and Daemons
Exit Codes, Signals, and Pipes
Network Programming
Data Encoding Using Go
Section 4: Deep Dive into Concurrency
Dealing with Channels and Goroutines
Synchronization with sync and atomic
Coordination Using Context
Implementing Concurrency Patterns
Section 5: A Guide to Using Reflection and CGO
Using Reflection
Using CGO
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