github.com/alibaba/ilogtail/pkg@v0.0.0-20250526110833-c53b480d046c/helper/net.go (about)

     1  // Copyright 2022 iLogtail Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package helper
    16  
    17  import (
    18  	"net"
    19  )
    20  
    21  func GetFreePort() (port int, err error) {
    22  	listener, err := net.Listen("tcp", ":0") //nolint:gosec
    23  	if err != nil {
    24  		return 0, err
    25  	}
    26  	defer listener.Close()
    27  	return listener.Addr().(*net.TCPAddr).Port, nil
    28  }