Go OS Signals Assigning signals to a channel
Example
Often times you will have reason to catch when your program is being told to stop by the OS and take some actions to preserve the state, or clean up your application. To accomplish this you can use the os/signal package from the standard library. Below is a simple example of assigning all signals from the system to a channel, and then how to react to those signals.
package main
import (
"fmt"
"os"
"os/signal"
)
func main() {
// create a channel for os.Signal
sigChan := make(chan os.Signal)
// assign all signal notifications to the channel
signal.Notify(sigChan)
// blocks until you get a signal from the OS
select {
// when a signal is received
case sig := <-sigChan:
// print this line telling us which signal was seen
fmt.Println("Received signal from OS:", sig)
}
}
When you run the above script it will create a channel, and then block until that channel receives a signal.
$ go run signals.go
^CReceived signal from OS: interrupt
The ^C above is the keyboard command CTRL+C which sends the SIGINT signal.
