Exemplo n.º 1
0
func TestDup(t *testing.T) {
	file, err := ioutil.TempFile("", "TestDup")
	if err != nil {
		t.Fatalf("Tempfile failed: %v", err)
	}
	defer os.Remove(file.Name())
	defer file.Close()
	f := int(file.Fd())

	newFd, err := unix.Dup(f)
	if err != nil {
		t.Fatalf("Dup: %v", err)
	}

	err = unix.Dup2(newFd, newFd+1)
	if err != nil {
		t.Fatalf("Dup2: %v", err)
	}

	b1 := []byte("Test123")
	b2 := make([]byte, 7)
	_, err = unix.Write(newFd+1, b1)
	if err != nil {
		t.Fatalf("Write to dup2 fd failed: %v", err)
	}
	_, err = unix.Seek(f, 0, 0)
	_, err = unix.Read(f, b2)
	if err != nil {
		t.Fatalf("Read back failed: %v", err)
	}
	if string(b1) != string(b2) {
		t.Errorf("Dup: stdout write not in file, expected %v, got %v", string(b1), string(b2))
	}
}
Exemplo n.º 2
0
// hackDump returns the value dump as a string.
func hackDump(v llvm.Value) (string, error) {
	// Open temp file.
	// TODO: Use an in-memory file instead of /tmp/x.
	fd, err := unix.Open("/tmp/x", unix.O_WRONLY|unix.O_TRUNC|unix.O_CREAT, 0644)
	if err != nil {
		return "", errutil.Err(err)
	}

	// Store original stderr.
	stderr, err := unix.Dup(2)
	if err != nil {
		return "", errutil.Err(err)
	}

	// Capture stderr and redirect its output to the temp file.
	err = unix.Dup2(fd, 2)
	if err != nil {
		return "", errutil.Err(err)
	}
	err = unix.Close(fd)
	if err != nil {
		return "", errutil.Err(err)
	}

	// Dump value.
	v.Dump()
	C.fflush_stderr()

	// Restore stderr.
	err = unix.Dup2(stderr, 2)
	if err != nil {
		return "", errutil.Err(err)
	}
	err = unix.Close(stderr)
	if err != nil {
		return "", errutil.Err(err)
	}

	// Return content of temp file.
	buf, err := ioutil.ReadFile("/tmp/x")
	if err != nil {
		return "", errutil.Err(err)
	}
	return string(buf), nil
}
Exemplo n.º 3
0
// redirectStderr to the file passed in
func redirectStderr(f *os.File) {
	err := unix.Dup2(int(f.Fd()), int(os.Stderr.Fd()))
	if err != nil {
		log.Fatalf("Failed to redirect stderr to file: %v", err)
	}
}
Exemplo n.º 4
0
// Filter ..
func Filter() error {

	/*if GCOn() == false {
		return fmt.Errorf("GC Debug flag not set")
	}*/

	fmt.Println("filtering GC statements")

	current = os.Stderr
	r, w, err := os.Pipe()
	if err != nil {
		return err
	}

	rr, ww, err := os.Pipe()
	if err != nil {
		return err
	}

	// dup the Stderr File descriptor
	syscall.Dup2(int(w.Fd()), int(os.Stderr.Fd()))

	// Listen on os.Stderr for messages and pipe them to the new files below
	go func(fwd *os.File, rr *os.File) {
		fmt.Println("running the goroutine - os.Stderr listener")
		// Just copy everything from the new os.Stderr into the older one
		io.Copy(w, rr)
	}(w, rr)

	// move os.Stderr
	os.Stderr = ww

	go func() {
		fmt.Println("running the goroutine")
		scanner := bufio.NewScanner(r)
		for scanner.Scan() {
			line := scanner.Text()

			if line[0:2] == "gc" {
				var wall, cpu, hs string

				run := &GCRun{
					Clock: Timing{},
					CPU:   CPU{},
					Heap:  Heap{},
				}

				// gc 2 @1.289s 0%: 0.10+0.61+0.018+1.3+0.20 ms clock, 0.20+0.61+0+0.13/1.1/2.5+0.41 ms cpu, 4->4->1 MB, 4 MB goal, 4 P
				_, err := fmt.Sscanf(line, "gc %d @%fs %d%%: %s ms clock, %s ms cpu, %s MB, %d MB goal, %d P", &run.N, &run.Time, &run.Perc, &wall, &cpu, &hs, &run.Heap.Goal, &run.Procs)

				if err != nil {
					fmt.Print(err)
				}

				fmt.Sscanf(hs, "%d->%d->%d", &run.Heap.Start, &run.Heap.End, &run.Heap.Live)
				fmt.Sscanf(wall, "%f+%f+%f+%f+%f", &run.Clock.SweepTerm, &run.Clock.Scan, &run.Clock.Sync, &run.Clock.Mark, &run.Clock.MarkTerm)
				fmt.Sscanf(cpu, "%f+%f+%f+%f/%f/%f+%f", &run.CPU.SweepTerm, &run.CPU.Scan, &run.CPU.Sync, &run.CPU.Mark.Assist, &run.CPU.Mark.Background, &run.CPU.Mark.Idle, &run.CPU.MarkTerm)

				fmt.Println(run)

			} else {

				fmt.Println(line)

			}

		}
	}()

	return nil
}
Exemplo n.º 5
0
func syscallDup(oldfd int, newfd int) (err error) {
	return unix.Dup2(oldfd, newfd)
}