How to gracefully shut down a Golang application, releasing resources and closing open files using the os package?

There are several steps you can take to gracefully shut down a Golang application, releasing resources and closing open files using the os package. Here's an example:

Create a channel to receive an interrupt signal or termination signal:

interrupt := make(chan os.Signal, 1)
signal.Notify(interrupt, os.Interrupt, syscall.SIGTERM)

Use a goroutine to wait for the interrupt signal:

go func() {
    <-interrupt
    // Perform cleanup actions and shut down the application gracefully
    // For example, close open files, release resources, etc.
    os.Exit(0)
}()

Wait for the interrupt signal or termination signal, without blocking the main goroutine:

// Your main code here...
// ...
// Wait for the interrupt signal or termination signal
select {}

Optionally, you can handle additional cleanup actions before exiting by using a defer statement:

func main() {
    // Close and release resources
    defer cleanup()
    
    // ...
    // Your main code here...
    // ...
    
    // Wait for the interrupt signal or termination signal
    select {}
}

func cleanup() {
    // Perform additional cleanup actions before exiting
    // For example, close open files, release resources, etc.
}

By following these steps, your Golang application will gracefully shut down, releasing resources and closing open files when it receives an interrupt signal or termination signal.