英文:
How do I fill out the syscall.Sockaddr structure so that I can later use it with syscall.Bind?
问题
使用go语言在Windows上，我有一个名为sock的syscall.Handle，我想将其绑定到一个名为"sa"的syscall.Sockaddr结构中指定的地址。
我该如何填写syscall.Sockaddr结构，以便稍后可以将其与syscall.Bind一起使用？
顺便说一下，sock是一个原始套接字。
var sa syscall.Sockaddr // 如何用我的IP地址填写这个结构？
e := syscall.Bind(sock, sa)
if e != nil {
fmt.Println("bind error", e)
}
英文:
Using go on Windows I have a syscall.Handle called sock that I want to bind to an address specified in a syscall.Sockaddr structure called "sa".
How do I fill out the syscall.Sockaddr structure so that I can later use it with syscall.Bind?
BTW, sock is a raw socket.
var sa syscall.Sockaddr // how to fill out this structure with my ip address???
e := syscall.Bind(sock, sa)
if e != nil {
fmt.Println("bind error", e)
}
答案1
得分: 7
当你在go语言中对某些事情不确定时，一个好的经验法则是“查看源代码”，特别是在涉及系统调用的地方。我怀疑缺乏文档是半有意的，因为正如之前提到的，这不是推荐的接口 - 最好使用net包来实现可移植的解决方案 
一旦你进入源代码（$GOROOT/src/pkg/syscall/syscall_windows.go），你会注意到Sockaddr根本不是一个结构体：
type Sockaddr interface {
sockaddr() (ptr uintptr, len int32, err error) // 小写；只有我们可以定义Sockaddrs
}
所以让我们寻找实现这个接口的结构体：
func (sa *SockaddrInet4) sockaddr() (uintptr, int32, error) {
func (sa *SockaddrInet6) sockaddr() (uintptr, int32, error) {
func (sa *SockaddrUnix) sockaddr() (uintptr, int32, error) {
在我查看的版本（1.0.2）中，Inet6和Unix的实现只是存根，但SockaddrInet4已经准备好了：
type SockaddrInet4 struct {
Port int
Addr [4]byte
raw RawSockaddrInet4
}
只需要填写Port和Addr即可。
英文:
A good rule of thumb when you're unsure of something in go is "check the source", especially where the syscall stuff is concerned. I suspect the lack of documentation is semi-intentional because as previously mentioned, it's not the recommended interface - better to use the net package for a portable solution
Once you get to the source ($GOROOT/src/pkg/syscall/syscall_windows.go), you'll notice that Sockaddr isn't a struct at all:
type Sockaddr interface {
sockaddr() (ptr uintptr, len int32, err error) // lowercase; only we can define Sockaddrs
}
So lets look for structs that implement this interface:
func (sa *SockaddrInet4) sockaddr() (uintptr, int32, error) {
func (sa *SockaddrInet6) sockaddr() (uintptr, int32, error) {
func (sa *SockaddrUnix) sockaddr() (uintptr, int32, error) {
The Inet6 and Unix implementations are just stubs in the version I'm looking at (1.0.2), but SockaddrInet4 is ready to go:
type SockaddrInet4 struct {
Port int
Addr [4]byte
raw RawSockaddrInet4
}
Just need to fill in Port and Addr.
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论