HTTP伺服器退出時如何執行清理操作？

import (
    "log"
    "os"
    "os/signal"
)

func main() {
    // Create a channel to receive signals
    sigchan := make(chan os.Signal)

    // Register to receive interrupt signals
    signal.Notify(sigchan, os.Interrupt)

    // Start a goroutine to handle signals
    go func() {
        // Wait for an interrupt signal
        <-sigchan

        // Log the event
        log.Println("Program killed!")

        // Perform final actions and wait for write operations to complete

        // Exit cleanly
        os.Exit(0)
    }()

    // Start the main program tasks
}