How to Get the Number of Hard Links for a File in Go?

Retrieving the Number of Hard Links in Go

When working with files in Go, you may need to retrieve the number of hard links associated with a specific file. Hard links provide an alternative way to access the same file without creating a separate physical copy.

The built-in os.Stat function in Go returns a FileInfo interface that offers various information about a file, including its name, size, mode, and modification time. However, the FileInfo interface does not provide direct access to the number of hard links.

To retrieve the number of hard links, you can use the underlying system-specific information accessible through the Sys field of FileInfo. For Linux systems, this data is stored in a syscall.Stat_t struct. The Nlink field in this struct represents the count of hard links to the file.

Here's an example of how to retrieve the number of hard links in Go:

<code class="go">package main

import (
    "fmt"
    "os"
    "syscall"
)

func main() {
    fi, err := os.Stat("filename")
    if err != nil {
        fmt.Println(err)
        return
    }
    nlink := uint64(0)
    if sys := fi.Sys(); sys != nil {
        if stat, ok := sys.(*syscall.Stat_t); ok {
            nlink = uint64(stat.Nlink)
        }
    }
    fmt.Println(nlink)
}</code>

Running this code with filename as a hard-linked file will print the number of hard links associated with it.

Using the system-specific information from the Sys field allows you to access deeper information about the file, including the number of hard links, which can be useful for various file management tasks.

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