Retro68/gcc/libgo/go/net/sendfile_windows.go

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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package net
import (
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"internal/poll"
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"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.
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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
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
}
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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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}
if lr != nil {
lr.N -= int64(done)
}
return int64(done), nil, true
}