golang sockopt_windows 代码
文件路径：/src/net/sockopt_windows.go
/ Copyright 2011 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
package net
import (
"os"
"syscall"
)
func setDefaultSockopts(s syscall.Handle, family, sotype int, ipv6only bool) error {
if family == syscall.AF_INET6 && sotype != syscall.SOCK_RAW {
/ Allow both IP versions even if the OS default
/ is otherwise. Note that some operating systems
/ never admit this option.
syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only))
}
if (sotype == syscall.SOCK_DGRAM || sotype == syscall.SOCK_RAW) && family != syscall.AF_UNIX && family != syscall.AF_INET6 {
/ Allow broadcast.
return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1))
}
return nil
}
func setDefaultListenerSockopts(s syscall.Handle) error {
/ Windows will reuse recently-used addresses by default.
/ SO_REUSEADDR should not be used here, as it allows
/ a socket to forcibly bind to a port in use by another socket.
/ This could lead to a non-deterministic behavior, where
/ connection requests over the port cannot be guaranteed
/ to be handled by the correct socket.
return nil
}
func setDefaultMulticastSockopts(s syscall.Handle) error {
/ Allow multicast UDP and raw IP datagram sockets to listen
/ concurrently across multiple listeners.
return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
}