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64 lines
1.7 KiB
64 lines
1.7 KiB
/*
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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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// checkPortAvailability - check if given port is already in use.
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// Note: The check method tries to listen on given port and closes it.
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// It is possible to have a disconnected client in this tiny window of time.
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func checkPortAvailability(port 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("", port))
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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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