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Go Systems Programming

You're reading from   Go Systems Programming Master Linux and Unix system level programming with Go

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Product type Paperback
Published in Sep 2017
Publisher Packt
ISBN-13 9781787125643
Length 466 pages
Edition 1st Edition
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Author (1):
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Mihalis Tsoukalos Mihalis Tsoukalos
Author Profile Icon Mihalis Tsoukalos
Mihalis Tsoukalos
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Table of Contents (13) Chapters Close

Preface 1. Getting Started with Go and Unix Systems Programming 2. Writing Programs in Go FREE CHAPTER 3. Advanced Go Features 4. Go Packages, Algorithms, and Data Structures 5. Files and Directories 6. File Input and Output 7. Working with System Files 8. Processes and Signals 9. Goroutines - Basic Features 10. Goroutines - Advanced Features 11. Writing Web Applications in Go 12. Network Programming

A simplified Go version of the dd utility

The dd(1) tool can do many things, but this section will implement a small part of its functionality. Our version of dd(1) will include support for two command-line flags: one for specifying the block size in bytes (-bs) and the other for specifying the total number of blocks that will be written (-count). Multiplying these two values will give you the size of the generated file in bytes.

The Go code is saved as ddGo.go and will be presented to you in four parts. The first part is the expected preamble:

package main 
 
import ( 
   "flag" 
   "fmt" 
   "math/rand" 
   "os" 
   "time" 
) 

The second part contains the Go code of two functions:

func random(min, max int) int { 
   return rand.Intn(max-min) + min 
} 
 
func createBytes(buf *[]byte, count int) { 
   if count == 0 { 
        ...
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