// Copyright 2019 The Gitea Authors. All rights reserved.// SPDX-License-Identifier: MIT package ssh import (	"forgejo.org/modules/graceful"	"forgejo.org/modules/log"	"forgejo.org/modules/setting" 	"github.com/gliderlabs/ssh") func listen(server *ssh.Server) {	gracefulServer := graceful.NewServer("tcp", server.Addr, "SSH")	gracefulServer.PerWriteTimeout = setting.SSH.PerWriteTimeout	gracefulServer.PerWritePerKbTimeout = setting.SSH.PerWritePerKbTimeout 	err := gracefulServer.ListenAndServe(server.Serve, setting.SSH.UseProxyProtocol)	if err != nil {		select {		case <-graceful.GetManager().IsShutdown():			log.Critical("Failed to start SSH server: %v", err)		default:			log.Fatal("Failed to start SSH server: %v", err)		}	}	log.Info("SSH Listener: %s Closed", server.Addr)} // builtinUnused informs our cleanup routine that we will not be using a ssh portfunc builtinUnused() {	graceful.GetManager().InformCleanup()}