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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 | } |