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Source file src/net/sendfile_windows.go

Documentation: net

  // 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
  }
  

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