x/sys/windows: missing SOCKADDR_BTH

[MatejMagat305]

I m not expert and I don t know, whether this belong to Proposals or Bugs, so sorry...

What version of Go are you using (go version)?

go version go1.18 windows/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

go env Output

set GO111MODULE=on
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\matej\AppData\Local\go-build
set GOENV=C:\Users\matej\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\matej\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\matej\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\Program Files\Go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=C:\Program Files\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.18
set GCCGO=gccgo
set GOAMD64=v1
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=C:\Users\matej\GolandProjects\bluetooth\go.mod
set GOWORK=
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\matej\AppData\Local\Temp\go-build2316299000=/tmp/go-build -gno-record-gcc-switches 

What did you do?

I wanted create bluetooth socket on windows and I found that, there is no SockaddrBth similar (eqivalent) to SOCKADDR_BTH:

package main

import "golang.org/x/sys/windows"

func main() {
	sock, err := windows.Socket(windows.AF_BTH, windows.SOCK_STREAM, windows.BTHPROTO_RFCOMM)
	if err != nil {
		panic(err)
	}
        println(sock) // here is all right  
	//err = windows.Bind(sock,?)
	//if err != nil {
	//	panic(err)
	//}
	//return
}

So I was trying to add own struct to vendor according above mention SOCKADDR_BTH

type SockaddrBth struct {
	family         uint16
	BtAddr         [6]byte
	ServiceClassId GUID
	Port           uint16
}

func (sa *SockaddrBth) sockaddr() (unsafe.Pointer, int32, error) {
	if sa.Port < 0 || sa.Port > 31 {
		return nil, 0, syscall.EINVAL
	}
	sa.family = AF_BTH
	p := (*[2]byte)(unsafe.Pointer(&sa.Port))
	p[0] = byte(sa.Port >> 8)
	p[1] = byte(sa.Port)
	return unsafe.Pointer(sa), int32(unsafe.Sizeof(*sa)), nil
}

and run

package main

import (
	"golang.org/x/sys/windows"
)

func main() {
        ...
	sock, err := windows.Socket(windows.AF_BTH, windows.SOCK_STREAM, windows.BTHPROTO_RFCOMM)
	if err != nil {
		panic(err)
	}
	g, _ := windows.GenerateGUID()
	s := &windows.SockaddrBth{
		BtAddr:         [6]byte{},
		ServiceClassId: g,
		Port:           1,
	}
	err = windows.Bind(sock, s)
	if err != nil {
		panic(err) //golang.org/x/sys/windows.WSAEFAULT (10014)
	}
       ...
}

What did you expect to see?

no error

What did you see instead?

golang.org/x/sys/windows.WSAEFAULT (10014)

[mknyszek]

CC @golang/runtime @alexbrainman

[alexbrainman]

golang.org/x/sys/windows.WSAEFAULT (10014)

@MatejMagat305

From

https://docs.microsoft.com/en-us/windows/win32/winsock/windows-sockets-error-codes-2

WSAEFAULT
10014
Bad address.
The system detected an invalid pointer address in attempting to use a pointer argument of a call. This error occurs if an application passes an invalid pointer value, or if the length of the buffer is too small. For instance, if the length of an argument, which is a sockaddr structure, is smaller than the sizeof(sockaddr).

I suspect there is a bug in your program. But I never used Bluetooth API on Windows. So I don't know what your problem is.

Alex

[MatejMagat305]

I was found it, but I do not know how i can fix it, because it should be available in pure GO ...

[alexbrainman]

I was found it, but I do not know how i can fix it, ...

I don't know how to fix it too.

Alex

[MatejMagat305]

Primary I do not want create own sockaddrBt ..., but I do not to see how and what I should use ... .