mirror of https://github.com/minio/minio.git
77 lines
2.3 KiB
Go
77 lines
2.3 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"net"
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"os"
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"syscall"
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)
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// Make sure that none of the other processes are listening on the
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// specified port on any of the interfaces.
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//
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// On linux if a process is listening on 127.0.0.1:9000 then Listen()
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// on ":9000" fails with the error "port already in use".
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// However on Mac OSX Listen() on ":9000" falls back to the IPv6 address.
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// This causes confusion on Mac OSX that minio server is not reachable
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// on 127.0.0.1 even though minio server is running. So before we start
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// the minio server we make sure that the port is free on each tcp network.
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//
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// Port is string on purpose here.
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// https://github.com/golang/go/issues/16142#issuecomment-245912773
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//
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// "Keep in mind that ports in Go are strings: https://play.golang.org/p/zk2WEri_E9"
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// - @bradfitz
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func checkPortAvailability(portStr string) error {
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network := [3]string{"tcp", "tcp4", "tcp6"}
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for _, n := range network {
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l, err := net.Listen(n, net.JoinHostPort("", portStr))
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if err != nil {
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if isAddrInUse(err) {
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// Return error if another process is listening on the
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// same port.
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return err
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}
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// Ignore any other error (ex. EAFNOSUPPORT)
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continue
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}
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// look for error so we don't have dangling connection
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if err = l.Close(); err != nil {
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return err
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}
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}
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return nil
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}
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// Return true if err is "address already in use" error.
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// syscall.EADDRINUSE is available on all OSes.
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func isAddrInUse(err error) bool {
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if opErr, ok := err.(*net.OpError); ok {
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if sysErr, ok := opErr.Err.(*os.SyscallError); ok {
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if errno, ok := sysErr.Err.(syscall.Errno); ok {
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if errno == syscall.EADDRINUSE {
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return true
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}
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}
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}
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}
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return false
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}
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