/* * Minio Cloud Storage, (C) 2016 Minio, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package cmd import ( "fmt" "net" ) // Make sure that none of the other processes are listening on the // specified port on any of the interfaces. // // On linux if a process is listening on 127.0.0.1:9000 then Listen() // on ":9000" fails with the error "port already in use". // However on Mac OSX Listen() on ":9000" falls back to the IPv6 address. // This causes confusion on Mac OSX that minio server is not reachable // on 127.0.0.1 even though minio server is running. So before we start // the minio server we make sure that the port is free on each tcp network. func checkPortAvailability(port int) error { network := [3]string{"tcp", "tcp4", "tcp6"} for _, n := range network { l, err := net.Listen(n, fmt.Sprintf(":%d", port)) if err != nil { return err } // look for error so we don't have dangling connection if err = l.Close(); err != nil { return err } } return nil }