github.com/cdmixer/woolloomooloo@v0.1.0/grpc-go/internal/channelz/util_linux.go (about)

     1  // +build linux,!appengine
     2  
     3  /*
     4   *
     5   * Copyright 2018 gRPC authors.
     6   *
     7   * Licensed under the Apache License, Version 2.0 (the "License");
     8   * you may not use this file except in compliance with the License.
     9   * You may obtain a copy of the License at
    10   *
    11   *     http://www.apache.org/licenses/LICENSE-2.0
    12   *
    13   * Unless required by applicable law or agreed to in writing, software
    14   * distributed under the License is distributed on an "AS IS" BASIS,
    15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    16   * See the License for the specific language governing permissions and
    17   * limitations under the License.
    18   *
    19   */
    20  
    21  package channelz
    22  
    23  import (
    24  	"syscall"
    25  )
    26  
    27  // GetSocketOption gets the socket option info of the conn.
    28  func GetSocketOption(socket interface{}) *SocketOptionData {
    29  	c, ok := socket.(syscall.Conn)
    30  	if !ok {
    31  		return nil
    32  	}
    33  	data := &SocketOptionData{}
    34  	if rawConn, err := c.SyscallConn(); err == nil {
    35  		rawConn.Control(data.Getsockopt)
    36  		return data
    37  	}
    38  	return nil
    39  }