unix: add Sendfile test
There wasn't one. I was mucking around with the Sendfile internals in
CL 154663 so I need one to make sure I didn't break anything.
Change-Id: I38b25de4995831680fdac440dfa7f26542d2624f
Reviewed-on: https://go-review.googlesource.com/c/154664
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/unix/sendfile_test.go b/unix/sendfile_test.go
new file mode 100644
index 0000000..d41fb93
--- /dev/null
+++ b/unix/sendfile_test.go
@@ -0,0 +1,98 @@
+// 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.
+
+// +build darwin,amd64 darwin,386 dragonfly freebsd linux solaris
+
+package unix_test
+
+import (
+ "io/ioutil"
+ "net"
+ "os"
+ "path/filepath"
+ "testing"
+
+ "golang.org/x/sys/unix"
+)
+
+func TestSendfile(t *testing.T) {
+ // Set up source data file.
+ tempDir, err := ioutil.TempDir("", "TestSendfile")
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer os.RemoveAll(tempDir)
+ name := filepath.Join(tempDir, "source")
+ const contents = "contents"
+ err = ioutil.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.Fatal(err)
+ }
+ defer conn.Close()
+ b, err := ioutil.ReadAll(conn)
+ 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
+}
