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

   1 // +build !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         "golang.org/x/sys/unix"
  27 )
  28
  29 // SocketOptionData defines the struct to hold socket option data, and related
  30 // getter function to obtain info from fd.
  31 type SocketOptionData struct {
  32         Linger      *unix.Linger
  33         RecvTimeout *unix.Timeval
  34         SendTimeout *unix.Timeval
  35         TCPInfo     *unix.TCPInfo
  36 }
  37
  38 // Getsockopt defines the function to get socket options requested by channelz.
  39 // It is to be passed to syscall.RawConn.Control().
  40 func (s *SocketOptionData) Getsockopt(fd uintptr) {
  41         if v, err := unix.GetsockoptLinger(int(fd), syscall.SOL_SOCKET, syscall.SO_LINGER); err == nil {
  42                 s.Linger = v
  43         }
  44         if v, err := unix.GetsockoptTimeval(int(fd), syscall.SOL_SOCKET, syscall.SO_RCVTIMEO); err == nil {
  45                 s.RecvTimeout = v
  46         }
  47         if v, err := unix.GetsockoptTimeval(int(fd), syscall.SOL_SOCKET, syscall.SO_SNDTIMEO); err == nil {
  48                 s.SendTimeout = v
  49         }
  50         if v, err := unix.GetsockoptTCPInfo(int(fd), syscall.SOL_TCP, syscall.TCP_INFO); err == nil {
  51                 s.TCPInfo = v
  52         }
  53 }