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.
15 // sendFile copies the contents of r to c using the sendfile
16 // system call to minimize copies.
18 // if handled == true, sendFile returns the number of bytes copied and any
21 // if handled == false, sendFile performed no work.
22 func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
23 var remain int64 = 1 << 62 // by default, copy until EOF
25 lr, ok := r.(*io.LimitedReader)
27 remain, r = lr.N, lr.R
37 sc, err := f.SyscallConn()
43 err = sc.Read(func(fd uintptr) bool {
44 written, werr = poll.SendFile(&c.pfd, int(fd), remain)
52 lr.N = remain - written
54 return written, wrapSyscallError("sendfile", err), written > 0