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// 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 (
"internal/syscall/windows"
"os"
"syscall"
)
const _SO_TYPE = windows.SO_TYPE
func dupSocket(h syscall.Handle) (syscall.Handle, error) {
var info syscall.WSAProtocolInfo
err := windows.WSADuplicateSocket(h, uint32(syscall.Getpid()), &info)
if err != nil {
return 0, err
}
return windows.WSASocket(-1, -1, -1, &info, 0, windows.WSA_FLAG_OVERLAPPED|windows.WSA_FLAG_NO_HANDLE_INHERIT)
}
func dupFileSocket(f *os.File) (syscall.Handle, error) {
// Call Fd to disassociate the IOCP from the handle,
// it is not safe to share a duplicated handle
// that is associated with IOCP.
// Don't use the returned fd, as it might be closed
// if f happens to be the last reference to the file.
f.Fd()
sc, err := f.SyscallConn()
if err != nil {
return 0, err
}
var h syscall.Handle
var syserr error
err = sc.Control(func(fd uintptr) {
h, syserr = dupSocket(syscall.Handle(fd))
})
if err == nil {
err = syserr
}
if err != nil {
return 0, err
}
return h, nil
}
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