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Mastering  Node.js

You're reading from   Mastering Node.js Build robust and scalable real-time server-side web applications efficiently

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Product type Paperback
Published in Dec 2017
Publisher Packt
ISBN-13 9781785888960
Length 498 pages
Edition 2nd Edition
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Authors (2):
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Sandro Pasquali Sandro Pasquali
Author Profile Icon Sandro Pasquali
Sandro Pasquali
Kevin Faaborg Kevin Faaborg
Author Profile Icon Kevin Faaborg
Kevin Faaborg
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Toc

Table of Contents (13) Chapters Close

Preface 1. Understanding the Node Environment FREE CHAPTER 2. Understanding Asynchronous Event-Driven Programming 3. Streaming Data Across Nodes and Clients 4. Using Node to Access the Filesystem 5. Managing Many Simultaneous Client Connections 6. Creating Real-Time Applications 7. Using Multiple Processes 8. Scaling Your Application 9. Microservices 10. Testing Your Application 11. Organizing Your Work into Modules 12. Creating Your Own C++ Add-ons

Communicating with your child

All instances of the ChildProcess object extend EventEmitter, exposing events useful for managing child data connections. Additionally, ChildProcess objects expose some useful methods for interacting with children directly. Let's go through those now, beginning with attributes and methods:

  • child.connected: When a child is disconnected from its parent via child.disconnect(), this flag will be set to false.
  • child.stdin: This is a WritableStream corresponding to the child's standard in.
  • child.stdout: This is a ReadableStream corresponding to the child's standard out.
  • child.stderr: This is a ReadableStream corresponding to the child's standard error.
  • child.pid: This is an integer representing the process ID (PID) assigned to the child process.
  • child.kill: This tries to terminate a child process, sending it an optional signal. If no...
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