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Source file src/internal/poll/sendfile_windows.go

Documentation: internal/poll

     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  	ft, err := syscall.GetFileType(src)
    12  	if err != nil {
    13  		return 0, err
    14  	}
    15  	// TransmitFile does not work with pipes
    16  	if ft == syscall.FILE_TYPE_PIPE {
    17  		return 0, syscall.ESPIPE
    18  	}
    19  
    20  	if err := fd.writeLock(); err != nil {
    21  		return 0, err
    22  	}
    23  	defer fd.writeUnlock()
    24  
    25  	o := &fd.wop
    26  	o.qty = uint32(n)
    27  	o.handle = src
    28  
    29  	// TODO(brainman): skip calling syscall.Seek if OS allows it
    30  	curpos, err := syscall.Seek(o.handle, 0, 1)
    31  	if err != nil {
    32  		return 0, err
    33  	}
    34  
    35  	o.o.Offset = uint32(curpos)
    36  	o.o.OffsetHigh = uint32(curpos >> 32)
    37  
    38  	done, err := wsrv.ExecIO(o, func(o *operation) error {
    39  		return syscall.TransmitFile(o.fd.Sysfd, o.handle, o.qty, 0, &o.o, nil, syscall.TF_WRITE_BEHIND)
    40  	})
    41  	return int64(done), err
    42  }
    43  

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