syscall: delete passfd_test.go

We can revisit the issue of testing in syscall after Go 1.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5844057

src/pkg/syscall/passfd_test.go

-// Copyright 2012 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 linux darwin probablyfreebsd probablyopenbsd
-
-package syscall_test
-
-import (
-	"flag"
-	"fmt"
-	"io/ioutil"
-	"net"
-	"os"
-	"os/exec"
-	"syscall"
-	"testing"
-	"time"
-)
-
-// TestPassFD tests passing a file descriptor over a Unix socket.
-func TestPassFD(t *testing.T) {
-	tempDir, err := ioutil.TempDir("", "TestPassFD")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(tempDir)
-
-	fds, err := syscall.Socketpair(syscall.AF_LOCAL, syscall.SOCK_STREAM, 0)
-	if err != nil {
-		t.Fatalf("Socketpair: %v", err)
-	}
-	defer syscall.Close(fds[0])
-	defer syscall.Close(fds[1])
-	writeFile := os.NewFile(uintptr(fds[0]), "child-writes")
-	readFile := os.NewFile(uintptr(fds[1]), "parent-reads")
-	defer writeFile.Close()
-	defer readFile.Close()
-
-	cmd := exec.Command(os.Args[0], "-test.run=TestPassFDChild", "--", tempDir)
-	cmd.Env = append([]string{"GO_WANT_HELPER_PROCESS=1"}, os.Environ()...)
-	cmd.ExtraFiles = []*os.File{writeFile}
-
-	out, err := cmd.CombinedOutput()
-	if len(out) > 0 || err != nil {
-		t.Errorf("child process: %q, %v", out, err)
-		return // not fatalf, so defers above run.
-	}
-
-	c, err := net.FileConn(readFile)
-	if err != nil {
-		t.Errorf("FileConn: %v", err)
-		return
-	}
-	defer c.Close()
-
-	uc, ok := c.(*net.UnixConn)
-	if !ok {
-		t.Errorf("unexpected FileConn type; expected UnixConn, got %T", c)
-		return
-	}
-
-	buf := make([]byte, 32) // expect 1 byte
-	oob := make([]byte, 32) // expect 24 bytes
-	closeUnix := time.AfterFunc(5*time.Second, func() {
-		t.Logf("timeout reading from unix socket")
-		uc.Close()
-	})
-	_, oobn, _, _, err := uc.ReadMsgUnix(buf, oob)
-	closeUnix.Stop()
-
-	scms, err := syscall.ParseSocketControlMessage(oob[:oobn])
-	if err != nil {
-		t.Errorf("ParseSocketControlMessage: %v", err)
-		return
-	}
-	if len(scms) != 1 {
-		t.Errorf("expected 1 SocketControlMessage; got scms = %#v", scms)
-		return
-	}
-	scm := scms[0]
-	gotFds, err := syscall.ParseUnixRights(&scm)
-	if err != nil {
-		t.Errorf("syscall.ParseUnixRights: %v", err)
-		return
-	}
-	if len(gotFds) != 1 {
-		t.Errorf("wanted 1 fd; got %#v", gotFds)
-		return
-	}
-
-	f := os.NewFile(uintptr(gotFds[0]), "fd-from-child")
-	defer f.Close()
-
-	got, err := ioutil.ReadAll(f)
-	want := "Hello from child process!\n"
-	if string(got) != want {
-		t.Errorf("child process ReadAll: %q, %v; want %q", got, err, want)
-	}
-}
-
-// Not a real test. This is the helper child process for TestPassFD.
-func TestPassFDChild(*testing.T) {
-	if os.Getenv("GO_WANT_HELPER_PROCESS") != "1" {
-		return
-	}
-	defer os.Exit(0)
-
-	// Look for our fd. I<t should be fd 3, but we work around an fd leak
-	// bug here (http://golang.org/issue/2603) to let it be elsewhere.
-	var uc *net.UnixConn
-	for fd := uintptr(3); fd <= 10; fd++ {
-		f := os.NewFile(fd, "unix-conn")
-		var ok bool
-		netc, _ := net.FileConn(f)
-		uc, ok = netc.(*net.UnixConn)
-		if ok {
-			break
-		}
-	}
-	if uc == nil {
-		fmt.Println("failed to find unix fd")
-		return
-	}
-
-	// Make a file f to send to our parent process on uc.
-	// We make it in tempDir, which our parent will clean up.
-	flag.Parse()
-	tempDir := flag.Arg(0)
-	f, err := ioutil.TempFile(tempDir, "")
-	if err != nil {
-		fmt.Printf("TempFile: %v", err)
-		return
-	}
-
-	f.Write([]byte("Hello from child process!\n"))
-	f.Seek(0, 0)
-
-	rights := syscall.UnixRights(int(f.Fd()))
-	dummyByte := []byte("x")
-	n, oobn, err := uc.WriteMsgUnix(dummyByte, rights, nil)
-	if err != nil {
-		fmt.Printf("WriteMsgUnix: %v", err)
-		return
-	}
-	if n != 1 || oobn != len(rights) {
-		fmt.Printf("WriteMsgUnix = %d, %d; want 1, %d", n, oobn, len(rights))
-		return
-	}
-}