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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.
- // +build hurd linux
- package net
- import (
- "internal/poll"
- "io"
- "os"
- )
- // sendFile copies the contents of r to c using the sendfile
- // 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.
- func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
- var remain int64 = 1 << 62 // by default, copy until EOF
- lr, ok := r.(*io.LimitedReader)
- if ok {
- remain, r = lr.N, lr.R
- if remain <= 0 {
- return 0, nil, true
- }
- }
- f, ok := r.(*os.File)
- if !ok {
- return 0, nil, false
- }
- sc, err := f.SyscallConn()
- if err != nil {
- return 0, nil, false
- }
- var werr error
- err = sc.Read(func(fd uintptr) bool {
- written, werr = poll.SendFile(&c.pfd, int(fd), remain)
- return true
- })
- if werr == nil {
- werr = err
- }
- if lr != nil {
- lr.N = remain - written
- }
- return written, wrapSyscallError("sendfile", err), written > 0
- }
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