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Editing: _socketio.py

"""
SocketIO imported from socket module in Python 3.

from socket import *
import io
import errno

__all__ = ['SocketIO']

EINTR = errno.EINTR
_blocking_errnos = (errno.EAGAIN, errno.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 IOError("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:
                n = e.args[0]
                if n == EINTR:
                    continue
                if n 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

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