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// Copyright 2018 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.
//go:build (darwin && amd64) || dragonfly || freebsd || linux || solaris
package unix_test
import (
"io"
"net"
"os"
"path/filepath"
"testing"
"golang.org/x/sys/unix"
)
func TestSendfile(t *testing.T) {
// Set up source data file.
name := filepath.Join(t.TempDir(), "source")
const contents = "contents"
err := os.WriteFile(name, []byte(contents), 0666)
if err != nil {
t.Fatal(err)
}
done := make(chan bool)
// Start server listening on a socket.
ln, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Skipf("listen failed: %s\n", err)
}
defer ln.Close()
go func() {
conn, err := ln.Accept()
if err != nil {
t.Errorf("failed to accept: %v", err)
return
}
defer conn.Close()
b, err := io.ReadAll(conn)
if err != nil {
t.Errorf("failed to read: %v", err)
return
}
if string(b) != contents {
t.Errorf("contents not transmitted: got %s (len=%d), want %s", string(b), len(b), contents)
}
done <- true
}()
// Open source file.
src, err := os.Open(name)
if err != nil {
t.Fatal(err)
}
// Send source file to server.
conn, err := net.Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatal(err)
}
file, err := conn.(*net.TCPConn).File()
if err != nil {
t.Fatal(err)
}
var off int64
n, err := unix.Sendfile(int(file.Fd()), int(src.Fd()), &off, len(contents))
if err != nil {
t.Errorf("Sendfile failed %s\n", err)
}
if n != len(contents) {
t.Errorf("written count wrong: want %d, got %d", len(contents), n)
}
// Note: off is updated on some systems and not others. Oh well.
// Linux: increments off by the amount sent.
// Darwin: leaves off unchanged.
// It would be nice to fix Darwin if we can.
if off != 0 && off != int64(len(contents)) {
t.Errorf("offset wrong: god %d, want %d or %d", off, 0, len(contents))
}
// The cursor position should be unchanged.
pos, err := src.Seek(0, 1)
if err != nil {
t.Errorf("can't get cursor position %s\n", err)
}
if pos != 0 {
t.Errorf("cursor position wrong: got %d, want 0", pos)
}
file.Close() // Note: required to have the close below really send EOF to the server.
conn.Close()
// Wait for server to close.
<-done
}
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