Go语言中检测已打开文件重命名：原理、局限与实践

package main

import (
    "fmt"
    "os"
    "time"
)

func main() {
    path := "data.txt"
    // 确保文件存在
    f, err := os.Create(path)
    if err != nil {
        fmt.Println("Error creating file:", err)
        return
    }
    f.Close()

    file, err := os.Open(path)
    if err != nil {
        fmt.Println("Error opening file:", err)
        return
    }
    defer file.Close()

    fmt.Printf("Initial file descriptor name: %s\n", path)

    // 模拟文件重命名操作
    fmt.Println("Renaming data.txt to renamed_data.txt in 10 seconds...")
    go func() {
        time.Sleep(10 * time.Second)
        newPath := "renamed_data.txt"
        err := os.Rename(path, newPath)
        if err != nil {
            fmt.Println("Error renaming file:", err)
        } else {
            fmt.Printf("File renamed from %s to %s\n", path, newPath)
        }
    }()

    for i := 0; i < 20; i++ { // 循环20次，每次间隔5秒，总计100秒
        details, err := file.Stat()
        if err != nil {
            fmt.Println("Error getting file stats:", err)
            break
        }
        // 观察 details.Name() 的输出，它不会随文件重命名而改变
        // 而 details.Size() 会反映文件内容变化（如果发生）
        fmt.Printf("Iteration %d: Name from file descriptor: %s, Size: %d bytes\n", i+1, details.Name(), details.Size())
        time.Sleep(5 * time.Second)
    }
}