golang readfrom_stub 代码
文件路径：/src/os/readfrom_stub.go
/ Copyright 2020 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 !linux
package os
import "io"
func (f *File) readFrom(r io.Reader) (n int64, handled bool, err error) {
return 0, false, nil
}