vendor/google.golang.org/grpc/internal/channelz/util_linux.go

   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 }