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1 // Copyright 2011 The Go Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style | |
3 // license that can be found in the LICENSE file. | |
4 | |
5 // Socket options for Windows | |
6 | |
7 package net | 1 package net |
8 | 2 |
9 import ( | 3 import ( |
10 "os" | |
11 "syscall" | 4 "syscall" |
12 ) | 5 ) |
13 | 6 |
14 func setDefaultSockopts(s syscall.Handle, f, t int) error { | 7 func setDefaultSockopts(s syscall.Handle, f, t int) { |
15 switch f { | 8 switch f { |
16 case syscall.AF_INET6: | 9 case syscall.AF_INET6: |
17 // Allow both IP versions even if the OS default is otherwise. | 10 // Allow both IP versions even if the OS default is otherwise. |
18 » » err := syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IP
V6_V6ONLY, 0) | 11 » » syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ON
LY, 0) |
19 » » if err != nil { | |
20 » » » return os.NewSyscallError("setsockopt", err) | |
21 » » } | |
22 | |
23 } | 12 } |
24 | 13 |
25 // Windows will reuse recently-used addresses by default. | |
26 // SO_REUSEADDR should not be used here, as it allows | |
27 // a socket to forcibly bind to a port in use by another socket. | |
28 // This could lead to a non-deterministic behavior, where | |
29 // connection requests over the port cannot be guaranteed | |
30 // to be handled by the correct socket. | |
31 | |
32 // Allow broadcast. | |
33 err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST
, 1) | |
34 if err != nil { | |
35 return os.NewSyscallError("setsockopt", err) | |
36 } | |
37 | |
38 return nil | |
39 } | |
40 | |
41 func setDefaultMulticastSockopts(s syscall.Handle) error { | |
42 // Allow multicast UDP and raw IP datagram sockets to listen | |
43 // concurrently across multiple listeners. | |
44 err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR
, 1) | |
45 if err != nil { | |
46 return os.NewSyscallError("setsockopt", err) | |
47 } | |
48 return nil | |
49 } | |
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