cpython/socket.py at 3.9 · python/cpython

	# Wrapper module for _socket, providing some additional facilities
	# implemented in Python.

	"""\
	This module provides socket operations and some related functions.
	On Unix, it supports IP (Internet Protocol) and Unix domain sockets.
	On other systems, it only supports IP. Functions specific for a
	socket are available as methods of the socket object.

	Functions:

	socket() -- create a new socket object
	socketpair() -- create a pair of new socket objects [*]
	fromfd() -- create a socket object from an open file descriptor [*]
	send_fds() -- Send file descriptor to the socket.
	recv_fds() -- Recieve file descriptors from the socket.
	fromshare() -- create a socket object from data received from socket.share() [*]
	gethostname() -- return the current hostname
	gethostbyname() -- map a hostname to its IP number
	gethostbyaddr() -- map an IP number or hostname to DNS info
	getservbyname() -- map a service name and a protocol name to a port number
	getprotobyname() -- map a protocol name (e.g. 'tcp') to a number
	ntohs(), ntohl() -- convert 16, 32 bit int from network to host byte order
	htons(), htonl() -- convert 16, 32 bit int from host to network byte order
	inet_aton() -- convert IP addr string (123.45.67.89) to 32-bit packed format
	inet_ntoa() -- convert 32-bit packed format IP to string (123.45.67.89)
	socket.getdefaulttimeout() -- get the default timeout value
	socket.setdefaulttimeout() -- set the default timeout value
	create_connection() -- connects to an address, with an optional timeout and
	optional source address.

	[*] not available on all platforms!

	Special objects:

	SocketType -- type object for socket objects
	error -- exception raised for I/O errors
	has_ipv6 -- boolean value indicating if IPv6 is supported

	IntEnum constants:

	AF_INET, AF_UNIX -- socket domains (first argument to socket() call)
	SOCK_STREAM, SOCK_DGRAM, SOCK_RAW -- socket types (second argument)

	Integer constants:

	Many other constants may be defined; these may be used in calls to
	the setsockopt() and getsockopt() methods.
	"""

	import _socket
	from _socket import *

	import os, sys, io, selectors
	from enum import IntEnum, IntFlag

	try:
	import errno
	except ImportError:
	errno = None
	EBADF = getattr(errno, 'EBADF', 9)
	EAGAIN = getattr(errno, 'EAGAIN', 11)
	EWOULDBLOCK = getattr(errno, 'EWOULDBLOCK', 11)

	__all__ = ["fromfd", "getfqdn", "create_connection", "create_server",
	"has_dualstack_ipv6", "AddressFamily", "SocketKind"]
	__all__.extend(os._get_exports_list(_socket))

	# Set up the socket.AF_* socket.SOCK_* constants as members of IntEnums for
	# nicer string representations.
	# Note that _socket only knows about the integer values. The public interface
	# in this module understands the enums and translates them back from integers
	# where needed (e.g. .family property of a socket object).

	IntEnum._convert_(
	'AddressFamily',
	__name__,
	lambda C: C.isupper() and C.startswith('AF_'))

	IntEnum._convert_(
	'SocketKind',
	__name__,
	lambda C: C.isupper() and C.startswith('SOCK_'))

	IntFlag._convert_(
	'MsgFlag',
	__name__,
	lambda C: C.isupper() and C.startswith('MSG_'))

	IntFlag._convert_(
	'AddressInfo',
	__name__,
	lambda C: C.isupper() and C.startswith('AI_'))

	_LOCALHOST = '127.0.0.1'
	_LOCALHOST_V6 = '::1'


	def _intenum_converter(value, enum_klass):
	"""Convert a numeric family value to an IntEnum member.

	If it's not a known member, return the numeric value itself.
	"""
	try:
	return enum_klass(value)
	except ValueError:
	return value


	# WSA error codes
	if sys.platform.lower().startswith("win"):
	errorTab = {}
	errorTab[6] = "Specified event object handle is invalid."
	errorTab[8] = "Insufficient memory available."
	errorTab[87] = "One or more parameters are invalid."
	errorTab[995] = "Overlapped operation aborted."
	errorTab[996] = "Overlapped I/O event object not in signaled state."
	errorTab[997] = "Overlapped operation will complete later."
	errorTab[10004] = "The operation was interrupted."
	errorTab[10009] = "A bad file handle was passed."
	errorTab[10013] = "Permission denied."
	errorTab[10014] = "A fault occurred on the network??" # WSAEFAULT
	errorTab[10022] = "An invalid operation was attempted."
	errorTab[10024] = "Too many open files."
	errorTab[10035] = "The socket operation would block"
	errorTab[10036] = "A blocking operation is already in progress."
	errorTab[10037] = "Operation already in progress."
	errorTab[10038] = "Socket operation on nonsocket."
	errorTab[10039] = "Destination address required."
	errorTab[10040] = "Message too long."
	errorTab[10041] = "Protocol wrong type for socket."
	errorTab[10042] = "Bad protocol option."
	errorTab[10043] = "Protocol not supported."
	errorTab[10044] = "Socket type not supported."
	errorTab[10045] = "Operation not supported."
	errorTab[10046] = "Protocol family not supported."
	errorTab[10047] = "Address family not supported by protocol family."
	errorTab[10048] = "The network address is in use."
	errorTab[10049] = "Cannot assign requested address."
	errorTab[10050] = "Network is down."
	errorTab[10051] = "Network is unreachable."
	errorTab[10052] = "Network dropped connection on reset."
	errorTab[10053] = "Software caused connection abort."
	errorTab[10054] = "The connection has been reset."
	errorTab[10055] = "No buffer space available."
	errorTab[10056] = "Socket is already connected."
	errorTab[10057] = "Socket is not connected."
	errorTab[10058] = "The network has been shut down."
	errorTab[10059] = "Too many references."
	errorTab[10060] = "The operation timed out."
	errorTab[10061] = "Connection refused."
	errorTab[10062] = "Cannot translate name."
	errorTab[10063] = "The name is too long."
	errorTab[10064] = "The host is down."
	errorTab[10065] = "The host is unreachable."
	errorTab[10066] = "Directory not empty."
	errorTab[10067] = "Too many processes."
	errorTab[10068] = "User quota exceeded."
	errorTab[10069] = "Disk quota exceeded."
	errorTab[10070] = "Stale file handle reference."
	errorTab[10071] = "Item is remote."
	errorTab[10091] = "Network subsystem is unavailable."
	errorTab[10092] = "Winsock.dll version out of range."
	errorTab[10093] = "Successful WSAStartup not yet performed."
	errorTab[10101] = "Graceful shutdown in progress."
	errorTab[10102] = "No more results from WSALookupServiceNext."
	errorTab[10103] = "Call has been canceled."
	errorTab[10104] = "Procedure call table is invalid."
	errorTab[10105] = "Service provider is invalid."
	errorTab[10106] = "Service provider failed to initialize."
	errorTab[10107] = "System call failure."
	errorTab[10108] = "Service not found."
	errorTab[10109] = "Class type not found."
	errorTab[10110] = "No more results from WSALookupServiceNext."
	errorTab[10111] = "Call was canceled."
	errorTab[10112] = "Database query was refused."
	errorTab[11001] = "Host not found."
	errorTab[11002] = "Nonauthoritative host not found."
	errorTab[11003] = "This is a nonrecoverable error."
	errorTab[11004] = "Valid name, no data record requested type."
	errorTab[11005] = "QoS receivers."
	errorTab[11006] = "QoS senders."
	errorTab[11007] = "No QoS senders."
	errorTab[11008] = "QoS no receivers."
	errorTab[11009] = "QoS request confirmed."
	errorTab[11010] = "QoS admission error."
	errorTab[11011] = "QoS policy failure."
	errorTab[11012] = "QoS bad style."
	errorTab[11013] = "QoS bad object."
	errorTab[11014] = "QoS traffic control error."
	errorTab[11015] = "QoS generic error."
	errorTab[11016] = "QoS service type error."
	errorTab[11017] = "QoS flowspec error."
	errorTab[11018] = "Invalid QoS provider buffer."
	errorTab[11019] = "Invalid QoS filter style."
	errorTab[11020] = "Invalid QoS filter style."
	errorTab[11021] = "Incorrect QoS filter count."
	errorTab[11022] = "Invalid QoS object length."
	errorTab[11023] = "Incorrect QoS flow count."
	errorTab[11024] = "Unrecognized QoS object."
	errorTab[11025] = "Invalid QoS policy object."
	errorTab[11026] = "Invalid QoS flow descriptor."
	errorTab[11027] = "Invalid QoS provider-specific flowspec."
	errorTab[11028] = "Invalid QoS provider-specific filterspec."
	errorTab[11029] = "Invalid QoS shape discard mode object."
	errorTab[11030] = "Invalid QoS shaping rate object."
	errorTab[11031] = "Reserved policy QoS element type."
	__all__.append("errorTab")


	class _GiveupOnSendfile(Exception): pass


	class socket(_socket.socket):

	"""A subclass of _socket.socket adding the makefile() method."""

	__slots__ = ["__weakref__", "_io_refs", "_closed"]

	def __init__(self, family=-1, type=-1, proto=-1, fileno=None):
	# For user code address family and type values are IntEnum members, but
	# for the underlying _socket.socket they're just integers. The
	# constructor of _socket.socket converts the given argument to an
	# integer automatically.
	if fileno is None:
	if family == -1:
	family = AF_INET
	if type == -1:
	type = SOCK_STREAM
	if proto == -1:
	proto = 0
	_socket.socket.__init__(self, family, type, proto, fileno)
	self._io_refs = 0
	self._closed = False

	def __enter__(self):
	return self

	def __exit__(self, *args):
	if not self._closed:
	self.close()

	def __repr__(self):
	"""Wrap __repr__() to reveal the real class name and socket
	address(es).
	"""
	closed = getattr(self, '_closed', False)
	s = "<%s.%s%s fd=%i, family=%s, type=%s, proto=%i" \
	% (self.__class__.__module__,
	self.__class__.__qualname__,
	" [closed]" if closed else "",
	self.fileno(),
	self.family,
	self.type,
	self.proto)
	if not closed:
	try:
	laddr = self.getsockname()
	if laddr:
	s += ", laddr=%s" % str(laddr)
	except error:
	pass
	try:
	raddr = self.getpeername()
	if raddr:
	s += ", raddr=%s" % str(raddr)
	except error:
	pass
	s += '>'
	return s

	def __getstate__(self):
	raise TypeError(f"cannot pickle {self.__class__.__name__!r} object")

	def dup(self):
	"""dup() -> socket object

	Duplicate the socket. Return a new socket object connected to the same
	system resource. The new socket is non-inheritable.
	"""
	fd = dup(self.fileno())
	sock = self.__class__(self.family, self.type, self.proto, fileno=fd)
	sock.settimeout(self.gettimeout())
	return sock

	def accept(self):
	"""accept() -> (socket object, address info)

	Wait for an incoming connection. Return a new socket
	representing the connection, and the address of the client.
	For IP sockets, the address info is a pair (hostaddr, port).
	"""
	fd, addr = self._accept()
	sock = socket(self.family, self.type, self.proto, fileno=fd)
	# Issue #7995: if no default timeout is set and the listening
	# socket had a (non-zero) timeout, force the new socket in blocking
	# mode to override platform-specific socket flags inheritance.
	if getdefaulttimeout() is None and self.gettimeout():
	sock.setblocking(True)
	return sock, addr

	def makefile(self, mode="r", buffering=None, *,
	encoding=None, errors=None, newline=None):
	"""makefile(...) -> an I/O stream connected to the socket

	The arguments are as for io.open() after the filename, except the only
	supported mode values are 'r' (default), 'w' and 'b'.
	"""
	# XXX refactor to share code?
	if not set(mode) <= {"r", "w", "b"}:
	raise ValueError("invalid mode %r (only r, w, b allowed)" % (mode,))
	writing = "w" in mode
	reading = "r" in mode or not writing
	assert reading or writing
	binary = "b" in mode
	rawmode = ""
	if reading:
	rawmode += "r"
	if writing:
	rawmode += "w"
	raw = SocketIO(self, rawmode)
	self._io_refs += 1
	if buffering is None:
	buffering = -1
	if buffering < 0:
	buffering = io.DEFAULT_BUFFER_SIZE
	if buffering == 0:
	if not binary:
	raise ValueError("unbuffered streams must be binary")
	return raw
	if reading and writing:
	buffer = io.BufferedRWPair(raw, raw, buffering)
	elif reading:
	buffer = io.BufferedReader(raw, buffering)
	else:
	assert writing
	buffer = io.BufferedWriter(raw, buffering)
	if binary:
	return buffer
	text = io.TextIOWrapper(buffer, encoding, errors, newline)
	text.mode = mode
	return text

	if hasattr(os, 'sendfile'):

	def _sendfile_use_sendfile(self, file, offset=0, count=None):
	self._check_sendfile_params(file, offset, count)
	sockno = self.fileno()
	try:
	fileno = file.fileno()
	except (AttributeError, io.UnsupportedOperation) as err:
	raise _GiveupOnSendfile(err) # not a regular file
	try:
	fsize = os.fstat(fileno).st_size
	except OSError as err:
	raise _GiveupOnSendfile(err) # not a regular file
	if not fsize:
	return 0 # empty file
	# Truncate to 1GiB to avoid OverflowError, see bpo-38319.
	blocksize = min(count or fsize, 2 ** 30)
	timeout = self.gettimeout()
	if timeout == 0:
	raise ValueError("non-blocking sockets are not supported")
	# poll/select have the advantage of not requiring any
	# extra file descriptor, contrarily to epoll/kqueue
	# (also, they require a single syscall).
	if hasattr(selectors, 'PollSelector'):
	selector = selectors.PollSelector()
	else:
	selector = selectors.SelectSelector()
	selector.register(sockno, selectors.EVENT_WRITE)

	total_sent = 0
	# localize variable access to minimize overhead
	selector_select = selector.select
	os_sendfile = os.sendfile
	try:
	while True:
	if timeout and not selector_select(timeout):
	raise _socket.timeout('timed out')
	if count:
	blocksize = count - total_sent
	if blocksize <= 0:
	break
	try:
	sent = os_sendfile(sockno, fileno, offset, blocksize)
	except BlockingIOError:
	if not timeout:
	# Block until the socket is ready to send some
	# data; avoids hogging CPU resources.
	selector_select()
	continue
	except OSError as err:
	if total_sent == 0:
	# We can get here for different reasons, the main
	# one being 'file' is not a regular mmap(2)-like
	# file, in which case we'll fall back on using
	# plain send().
	raise _GiveupOnSendfile(err)
	raise err from None
	else:
	if sent == 0:
	break # EOF
	offset += sent
	total_sent += sent
	return total_sent
	finally:
	if total_sent > 0 and hasattr(file, 'seek'):
	file.seek(offset)
	else:
	def _sendfile_use_sendfile(self, file, offset=0, count=None):
	raise _GiveupOnSendfile(
	"os.sendfile() not available on this platform")

	def _sendfile_use_send(self, file, offset=0, count=None):
	self._check_sendfile_params(file, offset, count)
	if self.gettimeout() == 0:
	raise ValueError("non-blocking sockets are not supported")
	if offset:
	file.seek(offset)
	blocksize = min(count, 8192) if count else 8192
	total_sent = 0
	# localize variable access to minimize overhead
	file_read = file.read
	sock_send = self.send
	try:
	while True:
	if count:
	blocksize = min(count - total_sent, blocksize)
	if blocksize <= 0:
	break
	data = memoryview(file_read(blocksize))
	if not data:
	break # EOF
	while True:
	try:
	sent = sock_send(data)
	except BlockingIOError:
	continue
	else:
	total_sent += sent
	if sent < len(data):
	data = data[sent:]
	else:
	break
	return total_sent
	finally:
	if total_sent > 0 and hasattr(file, 'seek'):
	file.seek(offset + total_sent)

	def _check_sendfile_params(self, file, offset, count):
	if 'b' not in getattr(file, 'mode', 'b'):
	raise ValueError("file should be opened in binary mode")
	if not self.type & SOCK_STREAM:
	raise ValueError("only SOCK_STREAM type sockets are supported")
	if count is not None:
	if not isinstance(count, int):
	raise TypeError(
	"count must be a positive integer (got {!r})".format(count))
	if count <= 0:
	raise ValueError(
	"count must be a positive integer (got {!r})".format(count))

	def sendfile(self, file, offset=0, count=None):
	"""sendfile(file[, offset[, count]]) -> sent

	Send a file until EOF is reached by using high-performance
	os.sendfile() and return the total number of bytes which
	were sent.
	file must be a regular file object opened in binary mode.
	If os.sendfile() is not available (e.g. Windows) or file is
	not a regular file socket.send() will be used instead.
	offset tells from where to start reading the file.
	If specified, count is the total number of bytes to transmit
	as opposed to sending the file until EOF is reached.
	File position is updated on return or also in case of error in
	which case file.tell() can be used to figure out the number of
	bytes which were sent.
	The socket must be of SOCK_STREAM type.
	Non-blocking sockets are not supported.
	"""
	try:
	return self._sendfile_use_sendfile(file, offset, count)
	except _GiveupOnSendfile:
	return self._sendfile_use_send(file, offset, count)

	def _decref_socketios(self):
	if self._io_refs > 0:
	self._io_refs -= 1
	if self._closed:
	self.close()

	def _real_close(self, _ss=_socket.socket):
	# This function should not reference any globals. See issue #808164.
	_ss.close(self)

	def close(self):
	# This function should not reference any globals. See issue #808164.
	self._closed = True
	if self._io_refs <= 0:
	self._real_close()

	def detach(self):
	"""detach() -> file descriptor

	Close the socket object without closing the underlying file descriptor.
	The object cannot be used after this call, but the file descriptor
	can be reused for other purposes. The file descriptor is returned.
	"""
	self._closed = True
	return super().detach()

	@property
	def family(self):
	"""Read-only access to the address family for this socket.
	"""
	return _intenum_converter(super().family, AddressFamily)

	@property
	def type(self):
	"""Read-only access to the socket type.
	"""
	return _intenum_converter(super().type, SocketKind)

	if os.name == 'nt':
	def get_inheritable(self):
	return os.get_handle_inheritable(self.fileno())
	def set_inheritable(self, inheritable):
	os.set_handle_inheritable(self.fileno(), inheritable)
	else:
	def get_inheritable(self):
	return os.get_inheritable(self.fileno())
	def set_inheritable(self, inheritable):
	os.set_inheritable(self.fileno(), inheritable)
	get_inheritable.__doc__ = "Get the inheritable flag of the socket"
	set_inheritable.__doc__ = "Set the inheritable flag of the socket"

	def fromfd(fd, family, type, proto=0):
	""" fromfd(fd, family, type[, proto]) -> socket object

	Create a socket object from a duplicate of the given file
	descriptor. The remaining arguments are the same as for socket().
	"""
	nfd = dup(fd)
	return socket(family, type, proto, nfd)

	if hasattr(_socket.socket, "sendmsg"):
	import array

	def send_fds(sock, buffers, fds, flags=0, address=None):
	""" send_fds(sock, buffers, fds[, flags[, address]]) -> integer

	Send the list of file descriptors fds over an AF_UNIX socket.
	"""
	return sock.sendmsg(buffers, [(_socket.SOL_SOCKET,
	_socket.SCM_RIGHTS, array.array("i", fds))])
	__all__.append("send_fds")

	if hasattr(_socket.socket, "recvmsg"):
	import array

	def recv_fds(sock, bufsize, maxfds, flags=0):
	""" recv_fds(sock, bufsize, maxfds[, flags]) -> (data, list of file
	descriptors, msg_flags, address)

	Receive up to maxfds file descriptors returning the message
	data and a list containing the descriptors.
	"""
	# Array of ints
	fds = array.array("i")
	msg, ancdata, flags, addr = sock.recvmsg(bufsize,
	_socket.CMSG_LEN(maxfds * fds.itemsize))
	for cmsg_level, cmsg_type, cmsg_data in ancdata:
	if (cmsg_level == _socket.SOL_SOCKET and cmsg_type == _socket.SCM_RIGHTS):
	fds.frombytes(cmsg_data[:
	len(cmsg_data) - (len(cmsg_data) % fds.itemsize)])

	return msg, list(fds), flags, addr
	__all__.append("recv_fds")

	if hasattr(_socket.socket, "share"):
	def fromshare(info):
	""" fromshare(info) -> socket object

	Create a socket object from the bytes object returned by
	socket.share(pid).
	"""
	return socket(0, 0, 0, info)
	__all__.append("fromshare")

	if hasattr(_socket, "socketpair"):

	def socketpair(family=None, type=SOCK_STREAM, proto=0):
	"""socketpair([family[, type[, proto]]]) -> (socket object, socket object)

	Create a pair of socket objects from the sockets returned by the platform
	socketpair() function.
	The arguments are the same as for socket() except the default family is
	AF_UNIX if defined on the platform; otherwise, the default is AF_INET.
	"""
	if family is None:
	try:
	family = AF_UNIX
	except NameError:
	family = AF_INET
	a, b = _socket.socketpair(family, type, proto)
	a = socket(family, type, proto, a.detach())
	b = socket(family, type, proto, b.detach())
	return a, b

	else:

	# Origin: https://gist.github.com/4325783, by Geert Jansen. Public domain.
	def socketpair(family=AF_INET, type=SOCK_STREAM, proto=0):
	if family == AF_INET:
	host = _LOCALHOST
	elif family == AF_INET6:
	host = _LOCALHOST_V6
	else:
	raise ValueError("Only AF_INET and AF_INET6 socket address families "
	"are supported")
	if type != SOCK_STREAM:
	raise ValueError("Only SOCK_STREAM socket type is supported")
	if proto != 0:
	raise ValueError("Only protocol zero is supported")

	# We create a connected TCP socket. Note the trick with
	# setblocking(False) that prevents us from having to create a thread.
	lsock = socket(family, type, proto)
	try:
	lsock.bind((host, 0))
	lsock.listen()
	# On IPv6, ignore flow_info and scope_id
	addr, port = lsock.getsockname()[:2]
	csock = socket(family, type, proto)
	try:
	csock.setblocking(False)
	try:
	csock.connect((addr, port))
	except (BlockingIOError, InterruptedError):
	pass
	csock.setblocking(True)
	ssock, _ = lsock.accept()
	except:
	csock.close()
	raise
	finally:
	lsock.close()
	return (ssock, csock)
	__all__.append("socketpair")

	socketpair.__doc__ = """socketpair([family[, type[, proto]]]) -> (socket object, socket object)
	Create a pair of socket objects from the sockets returned by the platform
	socketpair() function.
	The arguments are the same as for socket() except the default family is AF_UNIX
	if defined on the platform; otherwise, the default is AF_INET.
	"""

	_blocking_errnos = { EAGAIN, EWOULDBLOCK }

	class SocketIO(io.RawIOBase):

	"""Raw I/O implementation for stream sockets.

	This class supports the makefile() method on sockets. It provides
	the raw I/O interface on top of a socket object.
	"""

	# One might wonder why not let FileIO do the job instead. There are two
	# main reasons why FileIO is not adapted:
	# - it wouldn't work under Windows (where you can't used read() and
	# write() on a socket handle)
	# - it wouldn't work with socket timeouts (FileIO would ignore the
	# timeout and consider the socket non-blocking)

	# XXX More docs

	def __init__(self, sock, mode):
	if mode not in ("r", "w", "rw", "rb", "wb", "rwb"):
	raise ValueError("invalid mode: %r" % mode)
	io.RawIOBase.__init__(self)
	self._sock = sock
	if "b" not in mode:
	mode += "b"
	self._mode = mode
	self._reading = "r" in mode
	self._writing = "w" in mode
	self._timeout_occurred = False

	def readinto(self, b):
	"""Read up to len(b) bytes into the writable buffer b and return
	the number of bytes read. If the socket is non-blocking and no bytes
	are available, None is returned.

	If b is non-empty, a 0 return value indicates that the connection
	was shutdown at the other end.
	"""
	self._checkClosed()
	self._checkReadable()
	if self._timeout_occurred:
	raise OSError("cannot read from timed out object")
	while True:
	try:
	return self._sock.recv_into(b)
	except timeout:
	self._timeout_occurred = True
	raise
	except error as e:
	if e.args[0] in _blocking_errnos:
	return None
	raise

	def write(self, b):
	"""Write the given bytes or bytearray object b to the socket
	and return the number of bytes written. This can be less than
	len(b) if not all data could be written. If the socket is
	non-blocking and no bytes could be written None is returned.
	"""
	self._checkClosed()
	self._checkWritable()
	try:
	return self._sock.send(b)
	except error as e:
	# XXX what about EINTR?
	if e.args[0] in _blocking_errnos:
	return None
	raise

	def readable(self):
	"""True if the SocketIO is open for reading.
	"""
	if self.closed:
	raise ValueError("I/O operation on closed socket.")
	return self._reading

	def writable(self):
	"""True if the SocketIO is open for writing.
	"""
	if self.closed:
	raise ValueError("I/O operation on closed socket.")
	return self._writing

	def seekable(self):
	"""True if the SocketIO is open for seeking.
	"""
	if self.closed:
	raise ValueError("I/O operation on closed socket.")
	return super().seekable()

	def fileno(self):
	"""Return the file descriptor of the underlying socket.
	"""
	self._checkClosed()
	return self._sock.fileno()

	@property
	def name(self):
	if not self.closed:
	return self.fileno()
	else:
	return -1

	@property
	def mode(self):
	return self._mode

	def close(self):
	"""Close the SocketIO object. This doesn't close the underlying
	socket, except if all references to it have disappeared.
	"""
	if self.closed:
	return
	io.RawIOBase.close(self)
	self._sock._decref_socketios()
	self._sock = None


	def getfqdn(name=''):
	"""Get fully qualified domain name from name.

	An empty argument is interpreted as meaning the local host.

	First the hostname returned by gethostbyaddr() is checked, then
	possibly existing aliases. In case no FQDN is available and `name`
	was given, it is returned unchanged. If `name` was empty or '0.0.0.0',
	hostname from gethostname() is returned.
	"""
	name = name.strip()
	if not name or name == '0.0.0.0':
	name = gethostname()
	try:
	hostname, aliases, ipaddrs = gethostbyaddr(name)
	except error:
	pass
	else:
	aliases.insert(0, hostname)
	for name in aliases:
	if '.' in name:
	break
	else:
	name = hostname
	return name


	_GLOBAL_DEFAULT_TIMEOUT = object()

	def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT,
	source_address=None):
	"""Connect to address and return the socket object.

	Convenience function. Connect to address (a 2-tuple ``(host,
	port)``) and return the socket object. Passing the optional
	timeout parameter will set the timeout on the socket instance
	before attempting to connect. If no timeout is supplied, the
	global default timeout setting returned by :func:`getdefaulttimeout`
	is used. If source_address is set it must be a tuple of (host, port)
	for the socket to bind as a source address before making the connection.
	A host of '' or port 0 tells the OS to use the default.
	"""

	host, port = address
	err = None
	for res in getaddrinfo(host, port, 0, SOCK_STREAM):
	af, socktype, proto, canonname, sa = res
	sock = None
	try:
	sock = socket(af, socktype, proto)
	if timeout is not _GLOBAL_DEFAULT_TIMEOUT:
	sock.settimeout(timeout)
	if source_address:
	sock.bind(source_address)
	sock.connect(sa)
	# Break explicitly a reference cycle
	err = None
	return sock

	except error as _:
	err = _
	if sock is not None:
	sock.close()

	if err is not None:
	try:
	raise err
	finally:
	# Break explicitly a reference cycle
	err = None
	else:
	raise error("getaddrinfo returns an empty list")


	def has_dualstack_ipv6():
	"""Return True if the platform supports creating a SOCK_STREAM socket
	which can handle both AF_INET and AF_INET6 (IPv4 / IPv6) connections.
	"""
	if not has_ipv6 \
	or not hasattr(_socket, 'IPPROTO_IPV6') \
	or not hasattr(_socket, 'IPV6_V6ONLY'):
	return False
	try:
	with socket(AF_INET6, SOCK_STREAM) as sock:
	sock.setsockopt(IPPROTO_IPV6, IPV6_V6ONLY, 0)
	return True
	except error:
	return False


	def create_server(address, *, family=AF_INET, backlog=None, reuse_port=False,
	dualstack_ipv6=False):
	"""Convenience function which creates a SOCK_STREAM type socket
	bound to address (a 2-tuple (host, port)) and return the socket
	object.

	family should be either AF_INET or AF_INET6.
	backlog is the queue size passed to socket.listen().
	reuse_port dictates whether to use the SO_REUSEPORT socket option.
	dualstack_ipv6: if true and the platform supports it, it will
	create an AF_INET6 socket able to accept both IPv4 or IPv6
	connections. When false it will explicitly disable this option on
	platforms that enable it by default (e.g. Linux).

	>>> with create_server(('', 8000)) as server:
	... while True:
	... conn, addr = server.accept()
	... # handle new connection
	"""
	if reuse_port and not hasattr(_socket, "SO_REUSEPORT"):
	raise ValueError("SO_REUSEPORT not supported on this platform")
	if dualstack_ipv6:
	if not has_dualstack_ipv6():
	raise ValueError("dualstack_ipv6 not supported on this platform")
	if family != AF_INET6:
	raise ValueError("dualstack_ipv6 requires AF_INET6 family")
	sock = socket(family, SOCK_STREAM)
	try:
	# Note about Windows. We don't set SO_REUSEADDR because:
	# 1) It's unnecessary: bind() will succeed even in case of a
	# previous closed socket on the same address and still in
	# TIME_WAIT state.
	# 2) If set, another socket is free to bind() on the same
	# address, effectively preventing this one from accepting
	# connections. Also, it may set the process in a state where
	# it'll no longer respond to any signals or graceful kills.
	# See: msdn2.microsoft.com/en-us/library/ms740621(VS.85).aspx
	if os.name not in ('nt', 'cygwin') and \
	hasattr(_socket, 'SO_REUSEADDR'):
	try:
	sock.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
	except error:
	# Fail later on bind(), for platforms which may not
	# support this option.
	pass
	if reuse_port:
	sock.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1)
	if has_ipv6 and family == AF_INET6:
	if dualstack_ipv6:
	sock.setsockopt(IPPROTO_IPV6, IPV6_V6ONLY, 0)
	elif hasattr(_socket, "IPV6_V6ONLY") and \
	hasattr(_socket, "IPPROTO_IPV6"):
	sock.setsockopt(IPPROTO_IPV6, IPV6_V6ONLY, 1)
	try:
	sock.bind(address)
	except error as err:
	msg = '%s (while attempting to bind on address %r)' % \
	(err.strerror, address)
	raise error(err.errno, msg) from None
	if backlog is None:
	sock.listen()
	else:
	sock.listen(backlog)
	return sock
	except error:
	sock.close()
	raise


	def getaddrinfo(host, port, family=0, type=0, proto=0, flags=0):
	"""Resolve host and port into list of address info entries.

	Translate the host/port argument into a sequence of 5-tuples that contain
	all the necessary arguments for creating a socket connected to that service.
	host is a domain name, a string representation of an IPv4/v6 address or
	None. port is a string service name such as 'http', a numeric port number or
	None. By passing None as the value of host and port, you can pass NULL to
	the underlying C API.

	The family, type and proto arguments can be optionally specified in order to
	narrow the list of addresses returned. Passing zero as a value for each of
	these arguments selects the full range of results.
	"""
	# We override this function since we want to translate the numeric family
	# and socket type values to enum constants.
	addrlist = []
	for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
	af, socktype, proto, canonname, sa = res
	addrlist.append((_intenum_converter(af, AddressFamily),
	_intenum_converter(socktype, SocketKind),
	proto, canonname, sa))
	return addrlist