_ "unsafe"
)

//go:linkname RecvfromInet4 syscall.recvfromInet4
//go:noescape
func RecvfromInet4(fd int, p []byte, flags int, from *syscall.SockaddrInet4) (int, error)

//go:linkname RecvfromInet6 syscall.recvfromInet6
//go:noescape
func RecvfromInet6(fd int, p []byte, flags int, from *syscall.SockaddrInet6) (n int, err error)

//go:linkname SendtoInet4 syscall.sendtoInet4
//go:noescape

//go:build js

package unix

import (
	"syscall"
	_ "unsafe"
)

func RecvfromInet4(fd int, p []byte, flags int, from *syscall.SockaddrInet4) (int, error) {
	return 0, syscall.ENOSYS
}

func RecvfromInet6(fd int, p []byte, flags int, from *syscall.SockaddrInet6) (n int, err error) {
	return 0, syscall.ENOSYS
}

func SendtoInet4(fd int, p []byte, flags int, to *syscall.SockaddrInet4) (err error) {
	return syscall.ENOSYS

//go:build wasip1

package unix

import (
	"syscall"
	_ "unsafe"
)

func RecvfromInet4(fd int, p []byte, flags int, from *syscall.SockaddrInet4) (int, error) {
	return 0, syscall.ENOSYS
}

func RecvfromInet6(fd int, p []byte, flags int, from *syscall.SockaddrInet6) (n int, err error) {
	return 0, syscall.ENOSYS
}

func SendtoInet4(fd int, p []byte, flags int, to *syscall.SockaddrInet4) (err error) {
	return syscall.ENOSYS

		return
	}
	pp := (*RawSockaddrInet4)(unsafe.Pointer(&rsa))
	port := (*[2]byte)(unsafe.Pointer(&pp.Port))
	from.Port = int(port[0])<<8 + int(port[1])
	from.Addr = pp.Addr
	return
}

func recvfromInet6(fd int, p []byte, flags int, from *SockaddrInet6) (n int, err error) {
	var rsa RawSockaddrAny
	var socklen _Socklen = SizeofSockaddrAny
	if n, err = recvfrom(fd, p, flags, &rsa, &socklen); err != nil {
		return
	}

	if err := fd.readLock(); err != nil {
		return 0, err
	}
	defer fd.readUnlock()
	if err := fd.pd.prepareRead(fd.isFile); err != nil {
		return 0, err
	}
	for {
		n, err := unix.RecvfromInet6(fd.Sysfd, p, 0, from)
		if err != nil {
			if err == syscall.EINTR {
				continue
			}
			n = 0
			if err == syscall.EAGAIN && fd.pd.pollable() {
				if err = fd.pd.waitRead(fd.isFile); err == nil {