github.com/flyinox/gosm@v0.0.0-20171117061539-16768cb62077/src/internal/poll/sendfile_windows.go (about)

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package poll
     6  
     7  import "syscall"
     8  
     9  // SendFile wraps the TransmitFile call.
    10  func SendFile(fd *FD, src syscall.Handle, n int64) (int64, error) {
    11  	if err := fd.writeLock(); err != nil {
    12  		return 0, err
    13  	}
    14  	defer fd.writeUnlock()
    15  
    16  	o := &fd.wop
    17  	o.qty = uint32(n)
    18  	o.handle = src
    19  	done, err := wsrv.ExecIO(o, func(o *operation) error {
    20  		return syscall.TransmitFile(o.fd.Sysfd, o.handle, o.qty, 0, &o.o, nil, syscall.TF_WRITE_BEHIND)
    21  	})
    22  	return int64(done), err
    23  }