golang sendfile_stub 代码
文件路径：/src/net/sendfile_stub.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.
//go:build aix || (js && wasm) || netbsd || openbsd || ios
package net
import "io"
func sendFile(c *netFD, r io.Reader) (n int64, err error, handled bool) {
return 0, nil, false
}