69 lines
1.3 KiB
Go
69 lines
1.3 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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"io"
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"os"
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"syscall"
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)
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type sendfileOp struct {
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anOp
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src syscall.Handle // source
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n uint32
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}
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func (o *sendfileOp) Submit() (errno int) {
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return syscall.TransmitFile(o.fd.sysfd, o.src, o.n, 0, &o.o, nil, syscall.TF_WRITE_BEHIND)
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}
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func (o *sendfileOp) Name() string {
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return "TransmitFile"
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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 suppport >2GB file.
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func sendFile(c *netFD, r io.Reader) (written int64, err os.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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c.wio.Lock()
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defer c.wio.Unlock()
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c.incref()
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defer c.decref()
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var o sendfileOp
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o.Init(c)
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o.n = uint32(n)
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o.src = f.Fd()
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done, err := iosrv.ExecIO(&o, 0)
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if err != nil {
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return 0, 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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