select function and signal handling in a single threaded go code

select_example.go

package main

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

func main() {
  var count int = 1
  sig := make(chan os.Signal, 1)
  //signal.Notify(sig, syscall.SIGINT, syscall.SIGUSR2, syscall.SIGUSR1)
  signal.Notify(sig)

  go func() {
    var intr_count int = 0

    for {
       select {
         case sig1 := <-sig:
           fmt.Printf("Received signal %d\n", sig1)
           if sig1 == syscall.SIGUSR2 || sig1 == syscall.SIGUSR1 {
             fmt.Printf("Resetting counter to 1\n")
             count = 1
           } else if sig1 == syscall.SIGINT {
             intr_count += 1
             if intr_count == 1 {
               fmt.Printf("Hit Ctrl-c again to quit\n")
             } else {
               fmt.Printf("Quitting\n")
               os.Exit(0)
             }
           }

         default:
       }

       fmt.Printf("count:= %d\n", count)
       count += 1
       time.Sleep(1*time.Second)
    }
  } ()

  var input string
  # To pre-empt the main thread
  fmt.Scanln(&input)
}