How Can I Gracefully Handle Ctrl C Signals in Go for Clean Program Termination?

Capturing Ctrl C for Cleanup Operations: A "Defer" Approach

Handling signals in Go allows developers to respond to specific events, including the termination of a program. One common scenario is capturing the Ctrl C (SIGINT) signal to perform any necessary cleanup operations before the program exits.

Creating a Channel for Signal Handling

To capture the SIGINT signal, we utilize the os/signal package. First, we create a channel to receive signals:

c := make(chan os.Signal, 1)

Subscribing to the Ctrl C Signal

Next, we notify the channel to listen for the SIGINT signal:

signal.Notify(c, os.Interrupt)

Initiating a Goroutine for Signal Handling

We create a goroutine to handle signals continuously:

go func(){
    for sig := range c {
        // sig is a ^C, handle it
    }
}()

Performing Cleanup Operations

Within the goroutine, we can define the cleanup operations to be performed when Ctrl C is pressed. This could include writing data to disk, saving preferences, or any other task that should be completed before the program exits.

The manner in which you cause your program to terminate and print information based on the Ctrl C input is flexible and depends on the specific requirements of your program.

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