Basic template for a correctly cancelable go application.

main.go

/* Here is a basic template for a cancellable go app using ctr-c.
*/

package main

import (    
  "flag"
  "fmt"
  "io"
  "log"
  "os"
  "os/signal"
  "sync"
  "syscall"
  "golang.org/x/net/context"
)

func main_run(ctx context.Context) {
   /* Do main work here; ctx.Done() will return somtheing when ctr-c has been pressed. */
}

func main() {
    flag.Parse()
    ctx, cancel := context.WithCancel(context.Background())
    c := make(chan os.Signal)
    signal.Notify(c, os.Interrupt)
    signal.Notify(c, syscall.SIGTERM)
    var cancelwg sync.WaitGroup
    cancelwg.Add(1)
    go func() {
        select {
        case <-c:
            cancel()
        case <-ctx.Done():
        }
        cancelwg.Done()
    }()
    main_run(ctx)
    // Make sure cancel go routine exits.
    cancel()
    // Wait for the cancel go routine to exit.
    cancelwg.Wait()
}

I have packaged this up here https://github.com/gdey/cmd

So the above becomes:

package main

import (
   "github.com/gdey/cmd"
)

func main(){
     defer cmd.New().Complete()
     // do main stuff here. Use cmd.IsCancelled() and cmd.Cancelled() as needed.
}