Golang os.NewFile函数代码示例

func listenStream(netw, addr string) (l net.Listener, err error) {
	var (
		file *os.File
	)

	fd, err := listen(netw, addr)
	if err != nil {
		return nil, err
	}

	// Set backlog size to the maximum
	if err = syscall.Listen(fd, syscall.SOMAXCONN); err != nil {
		syscall.Close(fd)
		return nil, err
	}

	file = os.NewFile(uintptr(fd), filePrefix+strconv.Itoa(os.Getpid()))
	if l, err = net.FileListener(file); err != nil {
		syscall.Close(fd)
		return nil, err
	}

	if err = file.Close(); err != nil {
		syscall.Close(fd)
		l.Close()
		return nil, err
	}

	return l, err
}

func newfile(fd uintptr, name string) *os.File {
	p, err := winPath(name)
	if err != nil {
		return os.NewFile(fd, name)
	}
	return os.NewFile(fd, p)
}

func newPipeFd() (*Pipe, error) {
	r2pipeIn := os.Getenv("R2PIPE_IN")
	r2pipeOut := os.Getenv("R2PIPE_OUT")
	if r2pipeIn == "" || r2pipeOut == "" {
		return nil, errors.New("missing R2PIPE_{IN,OUT} vars")
	}
	r2pipeInFd, err := strconv.Atoi(r2pipeIn)
	if err != nil {
		return nil, err
	}
	r2pipeOutFd, err := strconv.Atoi(r2pipeOut)
	if err != nil {
		return nil, err
	}
	stdout := os.NewFile(uintptr(r2pipeInFd), "R2PIPE_IN")
	stdin := os.NewFile(uintptr(r2pipeOutFd), "R2PIPE_OUT")

	r2p := &Pipe{
		File:   "",
		r2cmd:  nil,
		stdin:  stdin,
		stdout: stdout,
	}
	return r2p, nil
}

func newSocketPair(name string) (*os.File, *os.File, error) {
	pair, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
	if err != nil {
		return nil, nil, err
	}
	return os.NewFile(uintptr(pair[0]), name), os.NewFile(uintptr(pair[1]), name), nil
}

// Pty returns a UNIX 98 pseudoterminal device.
// Pty returns a pair of fds representing the master and slave pair.
func Pty() (*os.File, *os.File, error) {
	open := func(path string) (uintptr, error) {
		fd, err := syscall.Open(path, syscall.O_NOCTTY|syscall.O_RDWR|syscall.O_CLOEXEC, 0666)
		if err != nil {
			return 0, fmt.Errorf("unable to open %q: %v", path, err)
		}
		return uintptr(fd), nil
	}

	ptm, err := open("/dev/ptmx")
	if err != nil {
		return nil, nil, err
	}

	sname, err := ptsname(ptm)
	if err != nil {
		return nil, nil, err
	}

	err = grantpt(ptm)
	if err != nil {
		return nil, nil, err
	}

	err = unlockpt(ptm)
	if err != nil {
		return nil, nil, err
	}

	pts, err := open(sname)
	if err != nil {
		return nil, nil, err
	}
	return os.NewFile(uintptr(ptm), "ptm"), os.NewFile(uintptr(pts), sname), nil
}

// Pty returns a UNIX 98 pseudoterminal device.
// Pty returns a pair of fds representing the master and slave pair.
func Pty() (*os.File, *os.File, error) {
	ptm, err := open_pty_master()
	if err != nil {
		return nil, nil, err
	}

	sname, err := Ptsname(ptm)
	if err != nil {
		return nil, nil, err
	}

	err = grantpt(ptm)
	if err != nil {
		return nil, nil, err
	}

	err = unlockpt(ptm)
	if err != nil {
		return nil, nil, err
	}

	pts, err := open_device(sname)
	if err != nil {
		return nil, nil, err
	}
	return os.NewFile(uintptr(ptm), "ptm"), os.NewFile(uintptr(pts), sname), nil
}

// Opens a pseudo-terminal, forks, sets up the pty slave as the new child process's controlling terminal and
// stdin/stdout/stderr, and execs the given command in the child process.  Returns the master
// terminal control, the child pid, and an Error if any.
func ForkPty(name string, argv []string, attr *Attributes, size *WindowSize) (*Terminal, int, os.Error) {
	master, slave, err := OpenPty(attr, size)
	if err != nil {
		return nil, -1, err
	}

	procattr := &os.ProcAttr{
		Dir: "",
		Env: nil,
		Files: []*os.File{
			os.NewFile(slave.Fd(), "/dev/stdin"),
			os.NewFile(slave.Fd(), "/dev/stdout"),
			os.NewFile(slave.Fd(), "/dev/stderr"),
		},
		Sys: &syscall.SysProcAttr{
			Setsid:  true,
			Setctty: true,
		},
	}

	proc, err := os.StartProcess(name, argv, procattr)
	if err != nil {
		return nil, -1, err
	}
	return master, proc.Pid, nil
}

func newPipe() (parent *os.File, child *os.File, err error) {
	fds, err := syscall.Socketpair(syscall.AF_LOCAL, syscall.SOCK_STREAM|syscall.SOCK_CLOEXEC, 0)
	if err != nil {
		return nil, nil, err
	}
	return os.NewFile(uintptr(fds[1]), "parent"), os.NewFile(uintptr(fds[0]), "child"), nil
}

func newFakeVTYServer() (*fakeVTYServer, error) {
	fds, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
	if err != nil {
		return nil, err
	}

	vtyClientFile := os.NewFile(uintptr(fds[1]), "vty-client")
	vtyClientConn, err := net.FileConn(vtyClientFile)
	if err != nil {
		return nil, err
	}

	vtyServerFile := os.NewFile(uintptr(fds[0]), "vty-server")
	vtyServerConn, err := net.FileConn(vtyServerFile)
	if err != nil {
		return nil, err
	}
	syscall.SetNonblock(fds[0], false)

	vs := &fakeVTYServer{
		clientConn: vtyClientConn,
		serverConn: vtyServerConn,
		clientFile: vtyClientFile,
		serverFile: vtyServerFile,

		send:     make(chan []byte),
		received: make(chan []byte),
	}

	go vs.read()
	go vs.write()

	return vs, nil
}

func createAttachment(stream *spdystream.Stream) (*os.File, error) {
	if stream.IsFinished() {
		return nil, fmt.Errorf("stream already finished")
	}

	socketFds, socketErr := syscall.Socketpair(syscall.AF_LOCAL, syscall.SOCK_STREAM|syscall.FD_CLOEXEC, 0)
	if socketErr != nil {
		return nil, socketErr
	}
	pipe := os.NewFile(uintptr(socketFds[1]), "")
	defer pipe.Close()
	conn, connErr := net.FileConn(pipe)
	if connErr != nil {
		return nil, connErr
	}

	go func() {
		io.Copy(conn, stream)
		conn.Close()
	}()
	go func() {
		io.Copy(stream, conn)
	}()

	return os.NewFile(uintptr(socketFds[0]), ""), nil
}

func socketPair() (sock1 *os.File, sock2 *os.File, err error) {
	var fds [2]int
	fds, err = syscall.Socketpair(syscall.AF_LOCAL, syscall.SOCK_STREAM, 0)
	if err != nil {
		fmt.Println(err.Error())
	}
	return os.NewFile(uintptr(fds[0]), "|0"), os.NewFile(uintptr(fds[1]), "|1"), err
}

func mount(dir string, ready chan<- struct{}, errp *error) (fusefd *os.File, err error) {
	// linux mount is never delayed
	close(ready)

	fds, err := syscall.Socketpair(syscall.AF_FILE, syscall.SOCK_STREAM, 0)
	if err != nil {
		return nil, fmt.Errorf("socketpair error: %v", err)
	}
	defer syscall.Close(fds[0])
	defer syscall.Close(fds[1])

	cmd := exec.Command("fusermount", "--", dir)
	cmd.Env = append(os.Environ(), "_FUSE_COMMFD=3")

	writeFile := os.NewFile(uintptr(fds[0]), "fusermount-child-writes")
	defer writeFile.Close()
	cmd.ExtraFiles = []*os.File{writeFile}

	out, err := cmd.CombinedOutput()
	if len(out) > 0 || err != nil {
		return nil, fmt.Errorf("fusermount: %q, %v", out, err)
	}

	readFile := os.NewFile(uintptr(fds[1]), "fusermount-parent-reads")
	defer readFile.Close()
	c, err := net.FileConn(readFile)
	if err != nil {
		return nil, fmt.Errorf("FileConn from fusermount socket: %v", err)
	}
	defer c.Close()

	uc, ok := c.(*net.UnixConn)
	if !ok {
		return nil, fmt.Errorf("unexpected FileConn type; expected UnixConn, got %T", c)
	}

	buf := make([]byte, 32) // expect 1 byte
	oob := make([]byte, 32) // expect 24 bytes
	_, oobn, _, _, err := uc.ReadMsgUnix(buf, oob)
	scms, err := syscall.ParseSocketControlMessage(oob[:oobn])
	if err != nil {
		return nil, fmt.Errorf("ParseSocketControlMessage: %v", err)
	}
	if len(scms) != 1 {
		return nil, fmt.Errorf("expected 1 SocketControlMessage; got scms = %#v", scms)
	}
	scm := scms[0]
	gotFds, err := syscall.ParseUnixRights(&scm)
	if err != nil {
		return nil, fmt.Errorf("syscall.ParseUnixRights: %v", err)
	}
	if len(gotFds) != 1 {
		return nil, fmt.Errorf("wanted 1 fd; got %#v", gotFds)
	}
	f := os.NewFile(uintptr(gotFds[0]), "/dev/fuse")
	return f, nil
}

func newCtlSockets() (*os.File, *os.File, error) {
	fds, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_SEQPACKET, 0)
	if err != nil {
		return nil, nil, err
	}

	f1 := os.NewFile(uintptr(fds[0]), "ctl")
	f2 := os.NewFile(uintptr(fds[1]), "ctl")
	return f1, f2, nil
}

func unixgramSocketpair() (l, r *os.File, err error) {
	fd, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_SEQPACKET, 0)
	if err != nil {
		return nil, nil, os.NewSyscallError("socketpair",
			err.(syscall.Errno))
	}
	l = os.NewFile(uintptr(fd[0]), "socketpair-half1")
	r = os.NewFile(uintptr(fd[1]), "socketpair-half2")
	return
}

// either gets a pipe off the pool or returns a brand new one
func initPipe() (p *pipe, err error) {
	var pp [2]int32
	_, _, e := syscall.RawSyscall(syscall.SYS_PIPE2, uintptr(unsafe.Pointer(&pp)), syscall.O_CLOEXEC, 0)
	if e != 0 {
		return nil, os.NewSyscallError("pipe", e)
	}
	fmt.Printf("Got new pipe, read fd %d, write fd %d\n", pp[0], pp[1])
	return &pipe{os.NewFile(uintptr(pp[0]), "|0"), os.NewFile(uintptr(pp[1]), "|1"), 0}, nil

}