File: freeport.go

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golang-github-facebookgo-freeport 0.0~git20150612.0.d4adf43-7
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// Package freeport provides an API to find a free port to bind to.
package freeport

import (
	"net"
	"strconv"
)

// Get a free port.
func Get() (port int, err error) {
	listener, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		return 0, err
	}
	defer listener.Close()

	addr := listener.Addr().String()
	_, portString, err := net.SplitHostPort(addr)
	if err != nil {
		return 0, err
	}

	return strconv.Atoi(portString)
}