int.go

package main

import (
	"fmt"
	"os"
	"strconv"
	"syscall"
)

func main() {
	if len(os.Args) != 2 {
		fmt.Println("Usage: ./int PID")
		os.Exit(1)
	}
	pid := os.Args[1]
	i, err := strconv.Atoi(pid)
	if err != nil {
		panic(err)
	}
	fmt.Println(syscall.Kill(i, syscall.SIGINT))
}