1 // Copyright 2011 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
14 // sendFile copies the contents of r to c using the TransmitFile
15 // system call to minimize copies.
17 // if handled == true, sendFile returns the number of bytes copied and any
20 // if handled == false, sendFile performed no work.
21 func sendFile(fd
*netFD
, r io
.Reader
) (written
int64, err error
, handled
bool) {
22 var n
int64 = 0 // by default, copy until EOF.
24 lr
, ok
:= r
.(*io
.LimitedReader
)
37 written
, err
= poll
.SendFile(&fd
.pfd
, syscall
.Handle(f
.Fd()), n
)
39 err
= wrapSyscallError("transmitfile", err
)
42 // If any byte was copied, regardless of any error
43 // encountered mid-way, handled must be set to true.