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| // 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.
|
| package net
|
| import (
| "internal/poll"
| "io"
| "os"
| "syscall"
| )
|
| // sendFile copies the contents of r to c using the TransmitFile
| // system call to minimize copies.
| //
| // if handled == true, sendFile returns the number of bytes copied and any
| // non-EOF error.
| //
| // if handled == false, sendFile performed no work.
| //
| // Note that sendfile for windows does not support >2GB file.
| func sendFile(fd *netFD, r io.Reader) (written int64, err error, handled bool) {
| var n int64 = 0 // by default, copy until EOF
|
| lr, ok := r.(*io.LimitedReader)
| if ok {
| n, r = lr.N, lr.R
| if n <= 0 {
| return 0, nil, true
| }
| }
| f, ok := r.(*os.File)
| if !ok {
| return 0, nil, false
| }
|
| done, err := poll.SendFile(&fd.pfd, syscall.Handle(f.Fd()), n)
|
| if err != nil {
| return 0, wrapSyscallError("transmitfile", err), false
| }
| if lr != nil {
| lr.N -= int64(done)
| }
| return int64(done), nil, true
| }
|
|
