Golang syscall.Listen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
}

// Listen wraps syscall.Listen.
func (sw *Switch) Listen(s syscall.Handle, backlog int) (err error) {
	so := sw.sockso(s)
	if so == nil {
		return syscall.Listen(s, backlog)
	}
	sw.fmu.RLock()
	f, _ := sw.fltab[FilterListen]
	sw.fmu.RUnlock()

	af, err := f.apply(so)
	if err != nil {
		return err
	}
	so.Err = syscall.Listen(s, backlog)
	if err = af.apply(so); err != nil {
		return err
	}

	sw.smu.Lock()
	defer sw.smu.Unlock()
	if so.Err != nil {
		sw.stats.getLocked(so.Cookie).ListenFailed++
		return so.Err
	}
	sw.stats.getLocked(so.Cookie).Listened++
	return nil
}

func so_listen(fd int, queue int) error {
	if queue < 1 {
		return os.NewSyscallError("so_listen", syscall.Listen(fd, syscall.SOMAXCONN))
	}

	return os.NewSyscallError("so_listen", syscall.Listen(fd, queue))

}

// ListenAX25 announces on the local port axPort using mycall as the local address.
func ListenAX25(axPort, mycall string) (net.Listener, error) {
	if _, err := loadPorts(); err != nil {
		return nil, err
	}

	// Setup local address (via callsign of supplied axPort)
	localAddr := newAX25Addr(mycall)
	if err := localAddr.setPort(axPort); err != nil {
		return nil, err
	}

	// Create file descriptor
	var socket fd
	if f, err := syscall.Socket(syscall.AF_AX25, syscall.SOCK_SEQPACKET, 0); err != nil {
		return nil, err
	} else {
		socket = fd(f)
	}

	if err := socket.bind(localAddr); err != nil {
		return nil, err
	}
	if err := syscall.Listen(int(socket), syscall.SOMAXCONN); err != nil {
		return nil, err
	}

	return ax25Listener{
		sock:      fd(socket),
		localAddr: AX25Addr{localAddr},
	}, nil
}

// Create a tcp socket, setting the TCP_FASTOPEN socket option.
func (s *TFOServer) Bind() (err error) {

	s.fd, err = syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
	if err != nil {
		if err == syscall.ENOPROTOOPT {
			err = errors.New("TCP Fast Open server support is unavailable (unsupported kernel).")
		}
		return
	}

	err = syscall.SetsockoptInt(s.fd, syscall.SOL_TCP, TCP_FASTOPEN, 1)
	if err != nil {
		err = errors.New(fmt.Sprintf("Failed to set necessary TCP_FASTOPEN socket option: %s", err))
		return
	}

	sa := &syscall.SockaddrInet4{Addr: s.ServerAddr, Port: s.ServerPort}

	err = syscall.Bind(s.fd, sa)
	if err != nil {
		err = errors.New(fmt.Sprintf("Failed to bind to Addr: %v, Port: %d, Reason: %s", s.ServerAddr, s.ServerPort, err))
		return
	}

	log.Printf("Server: Bound to addr: %v, port: %d\n", s.ServerAddr, s.ServerPort)

	err = syscall.Listen(s.fd, LISTEN_BACKLOG)
	if err != nil {
		err = errors.New(fmt.Sprintf("Failed to listen: %s", err))
		return
	}

	return

}

func main() {
	acceptingFd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
	check(err)

	addr := &syscall.SockaddrInet4{Port: 3000, Addr: [4]byte{0, 0, 0, 0}}
	err = syscall.Bind(acceptingFd, addr)
	check(err)

	err = syscall.Listen(acceptingFd, 100)
	check(err)

	for {
		connectionFd, _, err := syscall.Accept(acceptingFd)
		check(err)
		fmt.Println("Accepted new connectrion")

		data := make([]byte, 1024)
		_, err = syscall.Read(connectionFd, data)
		check(err)
		fmt.Printf("Received: %s\n", string(data))

		_, err = syscall.Write(connectionFd, data)
		check(err)

		err = syscall.Close(connectionFd)
		check(err)
	}
}

func (io *NetIOManager) ProxyNetListen(sa syscall.Sockaddr) error {
	serverfd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM,
		syscall.IPPROTO_TCP)
	if err != nil {
		goto Error
	}

	err = syscall.Bind(serverfd, sa)
	if err != nil {
		goto Cleanup
	}

	err = syscall.Listen(serverfd, io.max_backlog)
	if err != nil {
		goto Cleanup
	}

	err = syscall.EpollCtl(io.epoll_fd, syscall.EPOLL_CTL_ADD, serverfd,
		&syscall.EpollEvent{Events: syscall.EPOLLIN, Fd: int32(serverfd)})
	if err != nil {
		goto Cleanup
	}

	io.proxy_server_fd = serverfd
	return nil

Cleanup:
	syscall.Close(serverfd)
Error:
	return err
}

func CreateTCPSocket(proto, addr string) (net.Listener, error) {
	var err error
	var laddr *net.TCPAddr

	laddr, err = net.ResolveTCPAddr(proto, addr)
	if err != nil {
		return nil, err
	}

	family, ipv6only := favoriteTCPAddrFamily(proto, laddr, "listen")

	var socketAddr syscall.Sockaddr
	if socketAddr, err = ipToSockaddr(family, laddr.IP, laddr.Port, laddr.Zone); err != nil {
		panic(err)
		return nil, err
	}

	var s int
	if s, err = sysSocket(family, syscall.SOCK_STREAM, 0); err != nil {
		return nil, err
	}

	if err = setDefaultSockopts(s, family, syscall.SOCK_STREAM, ipv6only); err != nil {
		closesocket(s)
		return nil, err
	}

	if err = setDefaultListenerSockopts(s); err != nil {
		closesocket(s)
		return nil, err
	}

	if err = syscall.SetsockoptInt(s, syscall.SOL_SOCKET, SO_REUSEPORT, 1); err != nil {
		closesocket(s)
		panic(err)
		return nil, err
	}

	if err = syscall.Bind(s, socketAddr); err != nil {
		closesocket(s)
		return nil, err
	}

	if err = syscall.Listen(s, maxListenerBacklog()); err != nil {
		closesocket(s)
		return nil, err
	}

	file := os.NewFile(uintptr(s), "listener-"+laddr.String())
	defer file.Close()

	var socketListener net.Listener
	if socketListener, err = net.FileListener(file); err != nil {
		return nil, err
	}

	return socketListener, nil

}

// Listen returns TCP listener with SO_REUSEPORT option set.
//
// Only tcp4 network is supported.
//
// ErrNoReusePort error is returned if the system doesn't support SO_REUSEPORT.
func Listen(network, addr string) (l net.Listener, err error) {
	var (
		soType, fd int
		file       *os.File
		sockaddr   syscall.Sockaddr
	)

	if sockaddr, soType, err = getSockaddr(network, addr); err != nil {
		return nil, err
	}

	syscall.ForkLock.RLock()
	fd, err = syscall.Socket(soType, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
	if err == nil {
		syscall.CloseOnExec(fd)
	}
	syscall.ForkLock.RUnlock()
	if err != nil {
		return nil, err
	}

	if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
		syscall.Close(fd)
		return nil, err
	}

	if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, soReusePort, 1); err != nil {
		syscall.Close(fd)
		return nil, &ErrNoReusePort{err}
	}

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

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

	name := fmt.Sprintf("reuseport.%d.%s.%s", os.Getpid(), network, addr)
	file = os.NewFile(uintptr(fd), name)
	if l, err = net.FileListener(file); err != nil {
		file.Close()
		return nil, err
	}

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

	return l, err
}

func listen2(path string) int {
	_, err := os.Stat(path)
	if err == nil {
		os.Remove(path)
	}
	fd, _ := syscall.Socket(syscall.AF_LOCAL,
		syscall.SOCK_STREAM|syscall.SOCK_CLOEXEC, 0)
	addr := &syscall.SockaddrUnix{Name: path}
	syscall.Bind(fd, addr)
	syscall.Listen(fd, 1)
	return fd
}

// NewReusablePortListener returns net.FileListener that created from
// a file discriptor for a socket with SO_REUSEPORT option.
func NewReusablePortListener(proto, addr string) (l net.Listener, err error) {
	var (
		soType, fd int
		file       *os.File
		sockaddr   syscall.Sockaddr
	)

	if sockaddr, soType, err = getSockaddr(proto, addr); err != nil {
		return nil, err
	}

	syscall.ForkLock.RLock()
	if fd, err = syscall.Socket(soType, syscall.SOCK_STREAM, syscall.IPPROTO_TCP); err != nil {
		return nil, err
	}
	syscall.ForkLock.RUnlock()

	if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
		syscall.Close(fd)
		return nil, err
	}

	if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, reusePort, 1); err != nil {
		syscall.Close(fd)
		return nil, err
	}

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

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

	file = os.NewFile(uintptr(fd), getSocketFileName(proto, addr))
	if l, err = net.FileListener(file); err != nil {
		syscall.Close(fd)
		return nil, err
	}

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

	return l, err
}

// TuneAndListenTCP announces on the TCP address laddr and returns a TCP
// listener. The configuration config indicates additional socket options
// set on the listener socket.
func TuneAndListenTCP(net string, laddr *TCPAddr, tuners ...Tuner) (Listener, error) {
	var err error
	family, ipv6only := favoriteTCPAddrFamily(net, laddr, "listen")

	var socketAddr syscall.Sockaddr
	if socketAddr, err = ipToSockaddr(family, laddr.IP, laddr.Port, laddr.Zone); err != nil {
		return nil, err
	}

	var s int
	if s, err = sysSocket(family, syscall.SOCK_STREAM, 0); err != nil {
		return nil, err
	}

	if err = setDefaultSockopts(s, family, syscall.SOCK_STREAM, ipv6only); err != nil {
		closesocket(s)
		return nil, err
	}

	if err = setDefaultListenerSockopts(s); err != nil {
		closesocket(s)
		return nil, err
	}

	for _, tuner := range tuners {
		if err := tuner(s); err != nil {
			return nil, err
		}
	}

	if err = syscall.Bind(s, socketAddr); err != nil {
		closesocket(s)
		return nil, err
	}

	if err = syscall.Listen(s, maxListenerBacklog()); err != nil {
		closesocket(s)
		return nil, err
	}

	file := os.NewFile(uintptr(s), "listener-"+laddr.String())
	defer file.Close()

	var socketListener Listener
	if socketListener, err = FileListener(file); err != nil {
		return nil, err
	}

	return socketListener, nil
}

// NewReusablePortListener returns net.FileListener that created from a file discriptor for a socket with SO_REUSEPORT option.
func NewReusablePortListener(proto, addr string) (l net.Listener, err error) {
	var (
		soType, fd int
		file       *os.File
		sockaddr   syscall.Sockaddr
	)

	if sockaddr, soType, err = getSockaddr(proto, addr); err != nil {
		return nil, err
	}

	if fd, err = syscall.Socket(soType, syscall.SOCK_STREAM, syscall.IPPROTO_TCP); err != nil {
		return nil, err
	}

	defer func() {
		if err != nil {
			syscall.Close(fd)
		}
	}()

	if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
		return nil, err
	}

	if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, reusePort, 1); err != nil {
		return nil, err
	}

	if err = syscall.Bind(fd, sockaddr); err != nil {
		return nil, err
	}

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

	// File Name get be nil
	file = os.NewFile(uintptr(fd), filePrefix+strconv.Itoa(os.Getpid()))
	if l, err = net.FileListener(file); err != nil {
		return nil, err
	}

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

	return l, err
}

// ListenTCP announces on the TCP address laddr and returns a TCP listener.
// Net must be "tcp", "tcp4", or "tcp6".
// If laddr has a port of 0, it means to listen on some available port.
// The caller can use l.Addr() to retrieve the chosen address.
func ListenTCP(net string, laddr *TCPAddr) (*TCPListener, error) {
	fd, err := internetSocket(net, laddr.toAddr(), nil, syscall.SOCK_STREAM, 0, "listen", sockaddrToTCP)
	if err != nil {
		return nil, err
	}
	err = syscall.Listen(fd.sysfd, listenerBacklog)
	if err != nil {
		closesocket(fd.sysfd)
		return nil, &OpError{"listen", net, laddr, err}
	}
	l := new(TCPListener)
	l.fd = fd
	return l, nil
}

// ListenTCP announces on the TCP address laddr and returns a TCP listener.
// Net must be "tcp", "tcp4", or "tcp6".
// If laddr has a port of 0, it means to listen on some available port.
// The caller can use l.Addr() to retrieve the chosen address.
func ListenTCP(net string, laddr *TCPAddr) (l *TCPListener, err os.Error) {
	fd, err := internetSocket(net, laddr.toAddr(), nil, syscall.SOCK_STREAM, "listen", sockaddrToTCP)
	if err != nil {
		return nil, err
	}
	errno := syscall.Listen(fd.sysfd, listenBacklog())
	if errno != 0 {
		syscall.Close(fd.sysfd)
		return nil, &OpError{"listen", "tcp", laddr, os.Errno(errno)}
	}
	l = new(TCPListener)
	l.fd = fd
	return l, nil
}