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
21package channelz
22
23import (
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.
31type 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().
40func (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}
54