Too many open file error in net.Listener.Accept loop

server.go

package main

/*
Observe different behavior of net.Listener.Accept on Linux and OS X.

Steps:

1. Build this program on Linux or OS X.
2. Execute "ulimit -Sn 5" to limit the number of open file. (You may need to
   change the number to 6 or other values.)
3. Run the program.
4. Execute "nc 127.0.0.1 2345" several times.

On OS X, each connection will generate one failure log.
On Linux, each connection will generate hundreds or thousands of logs.
*/

import (
	"fmt"
	"net"
	"os"
)

func main() {
	ln, err := net.Listen("tcp", "127.0.0.1:2345")
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	errcnt := 0
	for {
		_, err := ln.Accept()
		if err != nil {
			errcnt++
			fmt.Println(err, errcnt)
			continue
		}
	}
}