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https://github.com/golang/go
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b384ee7ceb
The net package's sendfile tests exercise various paths where we expect sendfile to be used, but don't verify that sendfile was in fact used. Add a hook to internal/poll.SendFile to let us verify that sendfile was called when expected. Update os package tests (which use their own hook mechanism) to use this hook as well. For #66988 Change-Id: I7afb130dcfe0063d60c6ea0f8560cf8665ad5a81 Reviewed-on: https://go-review.googlesource.com/c/go/+/581778 Reviewed-by: Ian Lance Taylor <iant@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
50 lines
1.1 KiB
Go
50 lines
1.1 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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"internal/poll"
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"io"
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"os"
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"syscall"
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)
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const supportsSendfile = true
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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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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.
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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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written, err = poll.SendFile(&fd.pfd, syscall.Handle(f.Fd()), n)
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if err != nil {
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err = wrapSyscallError("transmitfile", err)
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}
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// If any byte was copied, regardless of any error
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// encountered mid-way, handled must be set to true.
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handled = written > 0
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return
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}
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