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    Copyright
    Foreword
    Preface
    Ch. 1. Strings
    Ch. 2. Numbers
    Ch. 3. Dates and Times
    Ch. 4. Arrays
    Ch. 5. Hashes
    Ch. 6. Pattern Matching
    Ch. 7. File Access
    Ch. 8. File Contents
    Ch. 9. Directories
    Ch. 10. Subroutines
    Ch. 11. References and Records
    Ch. 12. Packages, Libraries, and Modules
    Ch. 13. Classes, Objects, and Ties
    Ch. 14. Database Access
    Ch. 15. Interactivity
    Ch. 16. Process Management and Communication
    Introduction
    Recipe 16.1. Gathering Output from a Program
    Recipe 16.2. Running Another Program
    Recipe 16.3. Replacing the Current Program with a Different One
    Recipe 16.4. Reading or Writing to Another Program
    Recipe 16.5. Filtering Your Own Output
    Recipe 16.6. Preprocessing Input
    Recipe 16.7. Reading STDERR from a Program
    Recipe 16.8. Controlling Input and Output of Another Program
    Recipe 16.9. Controlling the Input, Output, and Error of Another Program
    Recipe 16.10. Communicating Between Related Processes
    Recipe 16.11. Making a Process Look Like a File with Named Pipes
    Recipe 16.12. Sharing Variables in Different Processes
    Recipe 16.13. Listing Available Signals
    Recipe 16.14. Sending a Signal
    Recipe 16.15. Installing a Signal Handler
    Recipe 16.16. Temporarily Overriding a Signal Handler
    Recipe 16.17. Writing a Signal Handler
    Recipe 16.18. Catching Ctrl-C
    Recipe 16.19. Avoiding Zombie Processes
    Recipe 16.20. Blocking Signals
    Recipe 16.21. Timing Out an Operation
    Recipe 16.22. Turning Signals into Fatal Errors
    Recipe 16.23. Program: sigrand
    Ch. 17. Sockets
    Ch. 18. Internet Services
    Ch. 19. CGI Programming
    Ch. 20. Web Automation
    Ch. 21. mod_perl
    Ch. 22. XML
    Colophon
    Index
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    Chapter 16. Process Management and Communication

    Chapter 16. Process Management and Communication

    It is quite a three-pipe problem, and I beg that you won't speak to me for fifty minutes.

    —Sherlock Holmes, The Red-Headed League


      

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