From 7aaecdbc52e952fa1291eec4d43ca46e4b092e2f Mon Sep 17 00:00:00 2001
From: yyoshiki41 <yyoshiki41@gmail.com>
Date: Wed, 3 Feb 2016 10:21:47 +0900
Subject: [PATCH] Add RunFd

---
 gin.go | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/gin.go b/gin.go
index 60f4ab29..7269c8a2 100644
--- a/gin.go
+++ b/gin.go
@@ -5,6 +5,7 @@
 package gin
 
 import (
+	"fmt"
 	"html/template"
 	"net"
 	"net/http"
@@ -255,6 +256,23 @@ func (engine *Engine) RunUnix(file string) (err error) {
 	return
 }
 
+// RunFd attaches the router to a http.Server and starts listening and serving HTTP requests
+// through the specified file descriptor.
+// Note: this method will block the calling goroutine indefinitely unless an error happens.
+func (engine *Engine) RunFd(fd int) (err error) {
+	debugPrint("Listening and serving HTTP on fd@%d", fd)
+	defer func() { debugPrintError(err) }()
+
+	f := os.NewFile(uintptr(fd), fmt.Sprintf("fd@%d", fd))
+	listener, err := net.FileListener(f)
+	if err != nil {
+		return
+	}
+	defer listener.Close()
+	err = http.Serve(listener, engine)
+	return
+}
+
 // Conforms to the http.Handler interface.
 func (engine *Engine) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	c := engine.pool.Get().(*Context)