SIGHUP race

gistfile1.go

package main

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

func main() {
	sigCh := make(chan os.Signal)
	signal.Notify(sigCh, syscall.SIGHUP)
	go func() {
		<-sigCh
		fmt.Println("caught")
	}()
	time.Sleep(time.Second)
	fmt.Println("finish")
}

Signal sent before handler is registered:

$ ./main & kill -HUP $!
[1] 16944
[1]+  Hangup: 1               ./main

Handler is given a short time to complete registering:

$ ./main & sleep 0.1 && kill -HUP $!
[1] 16947
caught
finish