How to take advantage of io.CopyBuff if os.File not support copy_file_range?

qingyunha · July 4, 2022, 6:05am

golang/go/blob/2e773a3894fba7af744090d7d42968f4993018e2/src/os/file.go#L155

    
      
          	return
          }
          
          
// ReadFrom implements io.ReaderFrom.
          func (f *File) ReadFrom(r io.Reader) (n int64, err error) {
          	if err := f.checkValid("write"); err != nil {
          		return 0, err
          	}
          	n, handled, e := f.readFrom(r)
          	if !handled {
          		return genericReadFrom(f, r) // without wrapping
          	}
          	return n, f.wrapErr("write", e)
          }
          
          
func genericReadFrom(f *File, r io.Reader) (int64, error) {
          	return io.Copy(onlyWriter{f}, r)
          }
          
          
type onlyWriter struct {
          	io.Writer

It will fallback to io.Copy if copy_file_range is not supported.

system · October 2, 2022, 6:06am

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