How Can I Perform Cleanup Actions When a Go Program Exits?

Performing End-of-Execution Actions in Go

In Go, you can execute specific actions when your program exits, including in response to a user-initiated interrupt (Ctrl-C). Understanding Unix signals can be helpful in these scenarios.

Catching the Interrupt Signal

To catch the interrupt signal (SIGINT), which is triggered when a user presses Ctrl-C, you can use the os.Signal and signal.Notify packages like this:

package main

import (
    "fmt"
    "os"
    "os/signal"
)

func main() {
    fmt.Println("Program started!")

    // Create a channel for receiving signals
    sigchan := make(chan os.Signal, 1)

    // Notify the channel on receipt of the interrupt signal
    signal.Notify(sigchan, os.Interrupt)

    // Start a separate goroutine to handle the interrupt signal
    go func() {
        <-sigchan
        fmt.Println("Program interrupted!")
        fmt.Println("Performing cleanup actions...")

        // Perform end-of-execution actions

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

    // Start main program tasks
}

In this example, a goroutine is launched to handle the interrupt signal. When Ctrl-C is pressed, it prints a message, performs any necessary cleanup actions (e.g., flushing buffers, closing connections), and calls os.Exit(0) to exit the program gracefully.

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