stop process on exit by catching SIGINT.

go/qst.go

import "log"
import "os"
import "os/exec"
import "os/signal"
import "path"
import "strings"
import "syscall"
	}
	runner := MakeRunner(fn(file))
	go runCmd(file, runner)
	c := make(chan os.Signal, 1)
	signal.Notify(c, os.Interrupt, os.Kill)
	s := <-c
	log.Printf("got signal: %s, exiting...", s)
	runner.Stop()
}
func runCmd(file string, runner *Runner) {
	runner.Start()
	lastMtime := time.Now()
	for {
	cmd      *exec.Cmd
	shellCmd string
	started  bool
	restart  bool
}
func MakeRunner(shellCmd string) *Runner {
	return &Runner{nil, shellCmd, false}
	return &Runner{nil, shellCmd, false, true}
}
func (r *Runner) Start() error {
			log.Printf("%s finished: %s", r.shellCmd, err)
			time.Sleep(1 * time.Second)
			if !r.restart {
				break
			}
		}
	}()
	return nil
}
func (r *Runner) Restart() error {
func (r *Runner) Kill() error {
	pgid, err := syscall.Getpgid(r.cmd.Process.Pid)
	if err == nil {
		syscall.Kill(-pgid, syscall.SIGTERM)
	return err
}
func (r *Runner) Restart() error {
	return r.Kill()
}
func (r *Runner) Stop() {
	r.restart = false
	r.Kill()
}
func isFile(file string) bool {
	info, err := os.Stat(file)
	return err == nil && !info.IsDir()