48 lines
1.0 KiB
Go
48 lines
1.0 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package net
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import (
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"internal/poll"
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"io"
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"os"
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"syscall"
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)
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// sendFile copies the contents of r to c using the TransmitFile
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// system call to minimize copies.
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//
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// if handled == true, sendFile returns the number of bytes copied and any
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// non-EOF error.
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//
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// if handled == false, sendFile performed no work.
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//
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// Note that sendfile for windows does not support >2GB file.
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func sendFile(fd *netFD, r io.Reader) (written int64, err error, handled bool) {
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var n int64 = 0 // by default, copy until EOF
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lr, ok := r.(*io.LimitedReader)
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if ok {
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n, r = lr.N, lr.R
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if n <= 0 {
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return 0, nil, true
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}
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}
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f, ok := r.(*os.File)
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if !ok {
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return 0, nil, false
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}
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done, err := poll.SendFile(&fd.pfd, syscall.Handle(f.Fd()), n)
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if err != nil {
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return 0, wrapSyscallError("transmitfile", err), false
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}
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if lr != nil {
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lr.N -= int64(done)
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}
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return int64(done), nil, true
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}
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