Restoring authorship annotation for <[email protected]>. Commit 2 of 2.

1 files changed, 640 insertions, 640 deletions

diff --git a/contrib/tools/python3/src/Lib/asyncore.py b/contrib/tools/python3/src/Lib/asyncore.py
index 0424b0c875c..ce16f11a2f5 100644
--- a/contrib/tools/python3/src/Lib/asyncore.py
+++ b/contrib/tools/python3/src/Lib/asyncore.py
@@ -1,642 +1,642 @@
-# -*- Mode: Python -*- 
-#   Id: asyncore.py,v 2.51 2000/09/07 22:29:26 rushing Exp 
-#   Author: Sam Rushing <[email protected]> 
- 
-# ====================================================================== 
-# Copyright 1996 by Sam Rushing 
-# 
-#                         All Rights Reserved 
-# 
-# Permission to use, copy, modify, and distribute this software and 
-# its documentation for any purpose and without fee is hereby 
-# granted, provided that the above copyright notice appear in all 
-# copies and that both that copyright notice and this permission 
-# notice appear in supporting documentation, and that the name of Sam 
-# Rushing not be used in advertising or publicity pertaining to 
-# distribution of the software without specific, written prior 
-# permission. 
-# 
-# SAM RUSHING DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 
-# INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN 
-# NO EVENT SHALL SAM RUSHING BE LIABLE FOR ANY SPECIAL, INDIRECT OR 
-# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS 
-# OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, 
-# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 
-# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 
-# ====================================================================== 
- 
-"""Basic infrastructure for asynchronous socket service clients and servers. 
- 
-There are only two ways to have a program on a single processor do "more 
-than one thing at a time".  Multi-threaded programming is the simplest and 
-most popular way to do it, but there is another very different technique, 
-that lets you have nearly all the advantages of multi-threading, without 
-actually using multiple threads. it's really only practical if your program 
-is largely I/O bound. If your program is CPU bound, then pre-emptive 
-scheduled threads are probably what you really need. Network servers are 
-rarely CPU-bound, however. 
- 
-If your operating system supports the select() system call in its I/O 
-library (and nearly all do), then you can use it to juggle multiple 
-communication channels at once; doing other work while your I/O is taking 
-place in the "background."  Although this strategy can seem strange and 
-complex, especially at first, it is in many ways easier to understand and 
-control than multi-threaded programming. The module documented here solves 
-many of the difficult problems for you, making the task of building 
-sophisticated high-performance network servers and clients a snap. 
-""" 
- 
-import select 
-import socket 
-import sys 
-import time 
-import warnings 
- 
-import os 
-from errno import EALREADY, EINPROGRESS, EWOULDBLOCK, ECONNRESET, EINVAL, \ 
-     ENOTCONN, ESHUTDOWN, EISCONN, EBADF, ECONNABORTED, EPIPE, EAGAIN, \ 
-     errorcode 
- 
-_DISCONNECTED = frozenset({ECONNRESET, ENOTCONN, ESHUTDOWN, ECONNABORTED, EPIPE, 
-                           EBADF}) 
- 
-try: 
-    socket_map 
-except NameError: 
-    socket_map = {} 
- 
-def _strerror(err): 
-    try: 
-        return os.strerror(err) 
-    except (ValueError, OverflowError, NameError): 
-        if err in errorcode: 
-            return errorcode[err] 
-        return "Unknown error %s" %err 
- 
-class ExitNow(Exception): 
-    pass 
- 
-_reraised_exceptions = (ExitNow, KeyboardInterrupt, SystemExit) 
- 
-def read(obj): 
-    try: 
-        obj.handle_read_event() 
-    except _reraised_exceptions: 
-        raise 
-    except: 
-        obj.handle_error() 
- 
-def write(obj): 
-    try: 
-        obj.handle_write_event() 
-    except _reraised_exceptions: 
-        raise 
-    except: 
-        obj.handle_error() 
- 
-def _exception(obj): 
-    try: 
-        obj.handle_expt_event() 
-    except _reraised_exceptions: 
-        raise 
-    except: 
-        obj.handle_error() 
- 
-def readwrite(obj, flags): 
-    try: 
-        if flags & select.POLLIN: 
-            obj.handle_read_event() 
-        if flags & select.POLLOUT: 
-            obj.handle_write_event() 
-        if flags & select.POLLPRI: 
-            obj.handle_expt_event() 
-        if flags & (select.POLLHUP | select.POLLERR | select.POLLNVAL): 
-            obj.handle_close() 
-    except OSError as e: 
-        if e.args[0] not in _DISCONNECTED: 
-            obj.handle_error() 
-        else: 
-            obj.handle_close() 
-    except _reraised_exceptions: 
-        raise 
-    except: 
-        obj.handle_error() 
- 
-def poll(timeout=0.0, map=None): 
-    if map is None: 
-        map = socket_map 
-    if map: 
-        r = []; w = []; e = [] 
-        for fd, obj in list(map.items()): 
-            is_r = obj.readable() 
-            is_w = obj.writable() 
-            if is_r: 
-                r.append(fd) 
-            # accepting sockets should not be writable 
-            if is_w and not obj.accepting: 
-                w.append(fd) 
-            if is_r or is_w: 
-                e.append(fd) 
-        if [] == r == w == e: 
-            time.sleep(timeout) 
-            return 
- 
-        r, w, e = select.select(r, w, e, timeout) 
- 
-        for fd in r: 
-            obj = map.get(fd) 
-            if obj is None: 
-                continue 
-            read(obj) 
- 
-        for fd in w: 
-            obj = map.get(fd) 
-            if obj is None: 
-                continue 
-            write(obj) 
- 
-        for fd in e: 
-            obj = map.get(fd) 
-            if obj is None: 
-                continue 
-            _exception(obj) 
- 
-def poll2(timeout=0.0, map=None): 
-    # Use the poll() support added to the select module in Python 2.0 
-    if map is None: 
-        map = socket_map 
-    if timeout is not None: 
-        # timeout is in milliseconds 
-        timeout = int(timeout*1000) 
-    pollster = select.poll() 
-    if map: 
-        for fd, obj in list(map.items()): 
-            flags = 0 
-            if obj.readable(): 
-                flags |= select.POLLIN | select.POLLPRI 
-            # accepting sockets should not be writable 
-            if obj.writable() and not obj.accepting: 
-                flags |= select.POLLOUT 
-            if flags: 
-                pollster.register(fd, flags) 
- 
-        r = pollster.poll(timeout) 
-        for fd, flags in r: 
-            obj = map.get(fd) 
-            if obj is None: 
-                continue 
-            readwrite(obj, flags) 
- 
-poll3 = poll2                           # Alias for backward compatibility 
- 
-def loop(timeout=30.0, use_poll=False, map=None, count=None): 
-    if map is None: 
-        map = socket_map 
- 
-    if use_poll and hasattr(select, 'poll'): 
-        poll_fun = poll2 
-    else: 
-        poll_fun = poll 
- 
-    if count is None: 
-        while map: 
-            poll_fun(timeout, map) 
- 
-    else: 
-        while map and count > 0: 
-            poll_fun(timeout, map) 
-            count = count - 1 
- 
-class dispatcher: 
- 
-    debug = False 
-    connected = False 
-    accepting = False 
-    connecting = False 
-    closing = False 
-    addr = None 
-    ignore_log_types = frozenset({'warning'}) 
- 
-    def __init__(self, sock=None, map=None): 
-        if map is None: 
-            self._map = socket_map 
-        else: 
-            self._map = map 
- 
-        self._fileno = None 
- 
-        if sock: 
-            # Set to nonblocking just to make sure for cases where we 
-            # get a socket from a blocking source. 
+# -*- Mode: Python -*-
+#   Id: asyncore.py,v 2.51 2000/09/07 22:29:26 rushing Exp
+#   Author: Sam Rushing <[email protected]>
+
+# ======================================================================
+# Copyright 1996 by Sam Rushing
+#
+#                         All Rights Reserved
+#
+# Permission to use, copy, modify, and distribute this software and
+# its documentation for any purpose and without fee is hereby
+# granted, provided that the above copyright notice appear in all
+# copies and that both that copyright notice and this permission
+# notice appear in supporting documentation, and that the name of Sam
+# Rushing not be used in advertising or publicity pertaining to
+# distribution of the software without specific, written prior
+# permission.
+#
+# SAM RUSHING DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+# INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
+# NO EVENT SHALL SAM RUSHING BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+# OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+# ======================================================================
+
+"""Basic infrastructure for asynchronous socket service clients and servers.
+
+There are only two ways to have a program on a single processor do "more
+than one thing at a time".  Multi-threaded programming is the simplest and
+most popular way to do it, but there is another very different technique,
+that lets you have nearly all the advantages of multi-threading, without
+actually using multiple threads. it's really only practical if your program
+is largely I/O bound. If your program is CPU bound, then pre-emptive
+scheduled threads are probably what you really need. Network servers are
+rarely CPU-bound, however.
+
+If your operating system supports the select() system call in its I/O
+library (and nearly all do), then you can use it to juggle multiple
+communication channels at once; doing other work while your I/O is taking
+place in the "background."  Although this strategy can seem strange and
+complex, especially at first, it is in many ways easier to understand and
+control than multi-threaded programming. The module documented here solves
+many of the difficult problems for you, making the task of building
+sophisticated high-performance network servers and clients a snap.
+"""
+
+import select
+import socket
+import sys
+import time
+import warnings
+
+import os
+from errno import EALREADY, EINPROGRESS, EWOULDBLOCK, ECONNRESET, EINVAL, \
+     ENOTCONN, ESHUTDOWN, EISCONN, EBADF, ECONNABORTED, EPIPE, EAGAIN, \
+     errorcode
+
+_DISCONNECTED = frozenset({ECONNRESET, ENOTCONN, ESHUTDOWN, ECONNABORTED, EPIPE,
+                           EBADF})
+
+try:
+    socket_map
+except NameError:
+    socket_map = {}
+
+def _strerror(err):
+    try:
+        return os.strerror(err)
+    except (ValueError, OverflowError, NameError):
+        if err in errorcode:
+            return errorcode[err]
+        return "Unknown error %s" %err
+
+class ExitNow(Exception):
+    pass
+
+_reraised_exceptions = (ExitNow, KeyboardInterrupt, SystemExit)
+
+def read(obj):
+    try:
+        obj.handle_read_event()
+    except _reraised_exceptions:
+        raise
+    except:
+        obj.handle_error()
+
+def write(obj):
+    try:
+        obj.handle_write_event()
+    except _reraised_exceptions:
+        raise
+    except:
+        obj.handle_error()
+
+def _exception(obj):
+    try:
+        obj.handle_expt_event()
+    except _reraised_exceptions:
+        raise
+    except:
+        obj.handle_error()
+
+def readwrite(obj, flags):
+    try:
+        if flags & select.POLLIN:
+            obj.handle_read_event()
+        if flags & select.POLLOUT:
+            obj.handle_write_event()
+        if flags & select.POLLPRI:
+            obj.handle_expt_event()
+        if flags & (select.POLLHUP | select.POLLERR | select.POLLNVAL):
+            obj.handle_close()
+    except OSError as e:
+        if e.args[0] not in _DISCONNECTED:
+            obj.handle_error()
+        else:
+            obj.handle_close()
+    except _reraised_exceptions:
+        raise
+    except:
+        obj.handle_error()
+
+def poll(timeout=0.0, map=None):
+    if map is None:
+        map = socket_map
+    if map:
+        r = []; w = []; e = []
+        for fd, obj in list(map.items()):
+            is_r = obj.readable()
+            is_w = obj.writable()
+            if is_r:
+                r.append(fd)
+            # accepting sockets should not be writable
+            if is_w and not obj.accepting:
+                w.append(fd)
+            if is_r or is_w:
+                e.append(fd)
+        if [] == r == w == e:
+            time.sleep(timeout)
+            return
+
+        r, w, e = select.select(r, w, e, timeout)
+
+        for fd in r:
+            obj = map.get(fd)
+            if obj is None:
+                continue
+            read(obj)
+
+        for fd in w:
+            obj = map.get(fd)
+            if obj is None:
+                continue
+            write(obj)
+
+        for fd in e:
+            obj = map.get(fd)
+            if obj is None:
+                continue
+            _exception(obj)
+
+def poll2(timeout=0.0, map=None):
+    # Use the poll() support added to the select module in Python 2.0
+    if map is None:
+        map = socket_map
+    if timeout is not None:
+        # timeout is in milliseconds
+        timeout = int(timeout*1000)
+    pollster = select.poll()
+    if map:
+        for fd, obj in list(map.items()):
+            flags = 0
+            if obj.readable():
+                flags |= select.POLLIN | select.POLLPRI
+            # accepting sockets should not be writable
+            if obj.writable() and not obj.accepting:
+                flags |= select.POLLOUT
+            if flags:
+                pollster.register(fd, flags)
+
+        r = pollster.poll(timeout)
+        for fd, flags in r:
+            obj = map.get(fd)
+            if obj is None:
+                continue
+            readwrite(obj, flags)
+
+poll3 = poll2                           # Alias for backward compatibility
+
+def loop(timeout=30.0, use_poll=False, map=None, count=None):
+    if map is None:
+        map = socket_map
+
+    if use_poll and hasattr(select, 'poll'):
+        poll_fun = poll2
+    else:
+        poll_fun = poll
+
+    if count is None:
+        while map:
+            poll_fun(timeout, map)
+
+    else:
+        while map and count > 0:
+            poll_fun(timeout, map)
+            count = count - 1
+
+class dispatcher:
+
+    debug = False
+    connected = False
+    accepting = False
+    connecting = False
+    closing = False
+    addr = None
+    ignore_log_types = frozenset({'warning'})
+
+    def __init__(self, sock=None, map=None):
+        if map is None:
+            self._map = socket_map
+        else:
+            self._map = map
+
+        self._fileno = None
+
+        if sock:
+            # Set to nonblocking just to make sure for cases where we
+            # get a socket from a blocking source.
             sock.setblocking(False)
-            self.set_socket(sock, map) 
-            self.connected = True 
-            # The constructor no longer requires that the socket 
-            # passed be connected. 
-            try: 
-                self.addr = sock.getpeername() 
-            except OSError as err: 
-                if err.args[0] in (ENOTCONN, EINVAL): 
-                    # To handle the case where we got an unconnected 
-                    # socket. 
-                    self.connected = False 
-                else: 
-                    # The socket is broken in some unknown way, alert 
-                    # the user and remove it from the map (to prevent 
-                    # polling of broken sockets). 
-                    self.del_channel(map) 
-                    raise 
-        else: 
-            self.socket = None 
- 
-    def __repr__(self): 
-        status = [self.__class__.__module__+"."+self.__class__.__qualname__] 
-        if self.accepting and self.addr: 
-            status.append('listening') 
-        elif self.connected: 
-            status.append('connected') 
-        if self.addr is not None: 
-            try: 
-                status.append('%s:%d' % self.addr) 
-            except TypeError: 
-                status.append(repr(self.addr)) 
-        return '<%s at %#x>' % (' '.join(status), id(self)) 
- 
-    def add_channel(self, map=None): 
-        #self.log_info('adding channel %s' % self) 
-        if map is None: 
-            map = self._map 
-        map[self._fileno] = self 
- 
-    def del_channel(self, map=None): 
-        fd = self._fileno 
-        if map is None: 
-            map = self._map 
-        if fd in map: 
-            #self.log_info('closing channel %d:%s' % (fd, self)) 
-            del map[fd] 
-        self._fileno = None 
- 
-    def create_socket(self, family=socket.AF_INET, type=socket.SOCK_STREAM): 
-        self.family_and_type = family, type 
-        sock = socket.socket(family, type) 
+            self.set_socket(sock, map)
+            self.connected = True
+            # The constructor no longer requires that the socket
+            # passed be connected.
+            try:
+                self.addr = sock.getpeername()
+            except OSError as err:
+                if err.args[0] in (ENOTCONN, EINVAL):
+                    # To handle the case where we got an unconnected
+                    # socket.
+                    self.connected = False
+                else:
+                    # The socket is broken in some unknown way, alert
+                    # the user and remove it from the map (to prevent
+                    # polling of broken sockets).
+                    self.del_channel(map)
+                    raise
+        else:
+            self.socket = None
+
+    def __repr__(self):
+        status = [self.__class__.__module__+"."+self.__class__.__qualname__]
+        if self.accepting and self.addr:
+            status.append('listening')
+        elif self.connected:
+            status.append('connected')
+        if self.addr is not None:
+            try:
+                status.append('%s:%d' % self.addr)
+            except TypeError:
+                status.append(repr(self.addr))
+        return '<%s at %#x>' % (' '.join(status), id(self))
+
+    def add_channel(self, map=None):
+        #self.log_info('adding channel %s' % self)
+        if map is None:
+            map = self._map
+        map[self._fileno] = self
+
+    def del_channel(self, map=None):
+        fd = self._fileno
+        if map is None:
+            map = self._map
+        if fd in map:
+            #self.log_info('closing channel %d:%s' % (fd, self))
+            del map[fd]
+        self._fileno = None
+
+    def create_socket(self, family=socket.AF_INET, type=socket.SOCK_STREAM):
+        self.family_and_type = family, type
+        sock = socket.socket(family, type)
         sock.setblocking(False)
-        self.set_socket(sock) 
- 
-    def set_socket(self, sock, map=None): 
-        self.socket = sock 
-        self._fileno = sock.fileno() 
-        self.add_channel(map) 
- 
-    def set_reuse_addr(self): 
-        # try to re-use a server port if possible 
-        try: 
-            self.socket.setsockopt( 
-                socket.SOL_SOCKET, socket.SO_REUSEADDR, 
-                self.socket.getsockopt(socket.SOL_SOCKET, 
-                                       socket.SO_REUSEADDR) | 1 
-                ) 
-        except OSError: 
-            pass 
- 
-    # ================================================== 
-    # predicates for select() 
-    # these are used as filters for the lists of sockets 
-    # to pass to select(). 
-    # ================================================== 
- 
-    def readable(self): 
-        return True 
- 
-    def writable(self): 
-        return True 
- 
-    # ================================================== 
-    # socket object methods. 
-    # ================================================== 
- 
-    def listen(self, num): 
-        self.accepting = True 
-        if os.name == 'nt' and num > 5: 
-            num = 5 
-        return self.socket.listen(num) 
- 
-    def bind(self, addr): 
-        self.addr = addr 
-        return self.socket.bind(addr) 
- 
-    def connect(self, address): 
-        self.connected = False 
-        self.connecting = True 
-        err = self.socket.connect_ex(address) 
-        if err in (EINPROGRESS, EALREADY, EWOULDBLOCK) \ 
-        or err == EINVAL and os.name == 'nt': 
-            self.addr = address 
-            return 
-        if err in (0, EISCONN): 
-            self.addr = address 
-            self.handle_connect_event() 
-        else: 
-            raise OSError(err, errorcode[err]) 
- 
-    def accept(self): 
-        # XXX can return either an address pair or None 
-        try: 
-            conn, addr = self.socket.accept() 
-        except TypeError: 
-            return None 
-        except OSError as why: 
-            if why.args[0] in (EWOULDBLOCK, ECONNABORTED, EAGAIN): 
-                return None 
-            else: 
-                raise 
-        else: 
-            return conn, addr 
- 
-    def send(self, data): 
-        try: 
-            result = self.socket.send(data) 
-            return result 
-        except OSError as why: 
-            if why.args[0] == EWOULDBLOCK: 
-                return 0 
-            elif why.args[0] in _DISCONNECTED: 
-                self.handle_close() 
-                return 0 
-            else: 
-                raise 
- 
-    def recv(self, buffer_size): 
-        try: 
-            data = self.socket.recv(buffer_size) 
-            if not data: 
-                # a closed connection is indicated by signaling 
-                # a read condition, and having recv() return 0. 
-                self.handle_close() 
-                return b'' 
-            else: 
-                return data 
-        except OSError as why: 
-            # winsock sometimes raises ENOTCONN 
-            if why.args[0] in _DISCONNECTED: 
-                self.handle_close() 
-                return b'' 
-            else: 
-                raise 
- 
-    def close(self): 
-        self.connected = False 
-        self.accepting = False 
-        self.connecting = False 
-        self.del_channel() 
-        if self.socket is not None: 
-            try: 
-                self.socket.close() 
-            except OSError as why: 
-                if why.args[0] not in (ENOTCONN, EBADF): 
-                    raise 
- 
-    # log and log_info may be overridden to provide more sophisticated 
-    # logging and warning methods. In general, log is for 'hit' logging 
-    # and 'log_info' is for informational, warning and error logging. 
- 
-    def log(self, message): 
-        sys.stderr.write('log: %s\n' % str(message)) 
- 
-    def log_info(self, message, type='info'): 
-        if type not in self.ignore_log_types: 
-            print('%s: %s' % (type, message)) 
- 
-    def handle_read_event(self): 
-        if self.accepting: 
-            # accepting sockets are never connected, they "spawn" new 
-            # sockets that are connected 
-            self.handle_accept() 
-        elif not self.connected: 
-            if self.connecting: 
-                self.handle_connect_event() 
-            self.handle_read() 
-        else: 
-            self.handle_read() 
- 
-    def handle_connect_event(self): 
-        err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR) 
-        if err != 0: 
-            raise OSError(err, _strerror(err)) 
-        self.handle_connect() 
-        self.connected = True 
-        self.connecting = False 
- 
-    def handle_write_event(self): 
-        if self.accepting: 
-            # Accepting sockets shouldn't get a write event. 
-            # We will pretend it didn't happen. 
-            return 
- 
-        if not self.connected: 
-            if self.connecting: 
-                self.handle_connect_event() 
-        self.handle_write() 
- 
-    def handle_expt_event(self): 
-        # handle_expt_event() is called if there might be an error on the 
-        # socket, or if there is OOB data 
-        # check for the error condition first 
-        err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR) 
-        if err != 0: 
-            # we can get here when select.select() says that there is an 
-            # exceptional condition on the socket 
-            # since there is an error, we'll go ahead and close the socket 
-            # like we would in a subclassed handle_read() that received no 
-            # data 
-            self.handle_close() 
-        else: 
-            self.handle_expt() 
- 
-    def handle_error(self): 
-        nil, t, v, tbinfo = compact_traceback() 
- 
-        # sometimes a user repr method will crash. 
-        try: 
-            self_repr = repr(self) 
-        except: 
-            self_repr = '<__repr__(self) failed for object at %0x>' % id(self) 
- 
-        self.log_info( 
-            'uncaptured python exception, closing channel %s (%s:%s %s)' % ( 
-                self_repr, 
-                t, 
-                v, 
-                tbinfo 
-                ), 
-            'error' 
-            ) 
-        self.handle_close() 
- 
-    def handle_expt(self): 
-        self.log_info('unhandled incoming priority event', 'warning') 
- 
-    def handle_read(self): 
-        self.log_info('unhandled read event', 'warning') 
- 
-    def handle_write(self): 
-        self.log_info('unhandled write event', 'warning') 
- 
-    def handle_connect(self): 
-        self.log_info('unhandled connect event', 'warning') 
- 
-    def handle_accept(self): 
-        pair = self.accept() 
-        if pair is not None: 
-            self.handle_accepted(*pair) 
- 
-    def handle_accepted(self, sock, addr): 
-        sock.close() 
-        self.log_info('unhandled accepted event', 'warning') 
- 
-    def handle_close(self): 
-        self.log_info('unhandled close event', 'warning') 
-        self.close() 
- 
-# --------------------------------------------------------------------------- 
-# adds simple buffered output capability, useful for simple clients. 
-# [for more sophisticated usage use asynchat.async_chat] 
-# --------------------------------------------------------------------------- 
- 
-class dispatcher_with_send(dispatcher): 
- 
-    def __init__(self, sock=None, map=None): 
-        dispatcher.__init__(self, sock, map) 
-        self.out_buffer = b'' 
- 
-    def initiate_send(self): 
-        num_sent = 0 
-        num_sent = dispatcher.send(self, self.out_buffer[:65536]) 
-        self.out_buffer = self.out_buffer[num_sent:] 
- 
-    def handle_write(self): 
-        self.initiate_send() 
- 
-    def writable(self): 
-        return (not self.connected) or len(self.out_buffer) 
- 
-    def send(self, data): 
-        if self.debug: 
-            self.log_info('sending %s' % repr(data)) 
-        self.out_buffer = self.out_buffer + data 
-        self.initiate_send() 
- 
-# --------------------------------------------------------------------------- 
-# used for debugging. 
-# --------------------------------------------------------------------------- 
- 
-def compact_traceback(): 
-    t, v, tb = sys.exc_info() 
-    tbinfo = [] 
-    if not tb: # Must have a traceback 
-        raise AssertionError("traceback does not exist") 
-    while tb: 
-        tbinfo.append(( 
-            tb.tb_frame.f_code.co_filename, 
-            tb.tb_frame.f_code.co_name, 
-            str(tb.tb_lineno) 
-            )) 
-        tb = tb.tb_next 
- 
-    # just to be safe 
-    del tb 
- 
-    file, function, line = tbinfo[-1] 
-    info = ' '.join(['[%s|%s|%s]' % x for x in tbinfo]) 
-    return (file, function, line), t, v, info 
- 
-def close_all(map=None, ignore_all=False): 
-    if map is None: 
-        map = socket_map 
-    for x in list(map.values()): 
-        try: 
-            x.close() 
-        except OSError as x: 
-            if x.args[0] == EBADF: 
-                pass 
-            elif not ignore_all: 
-                raise 
-        except _reraised_exceptions: 
-            raise 
-        except: 
-            if not ignore_all: 
-                raise 
-    map.clear() 
- 
-# Asynchronous File I/O: 
-# 
-# After a little research (reading man pages on various unixen, and 
-# digging through the linux kernel), I've determined that select() 
-# isn't meant for doing asynchronous file i/o. 
-# Heartening, though - reading linux/mm/filemap.c shows that linux 
-# supports asynchronous read-ahead.  So _MOST_ of the time, the data 
-# will be sitting in memory for us already when we go to read it. 
-# 
-# What other OS's (besides NT) support async file i/o?  [VMS?] 
-# 
-# Regardless, this is useful for pipes, and stdin/stdout... 
- 
-if os.name == 'posix': 
-    class file_wrapper: 
-        # Here we override just enough to make a file 
-        # look like a socket for the purposes of asyncore. 
-        # The passed fd is automatically os.dup()'d 
- 
-        def __init__(self, fd): 
-            self.fd = os.dup(fd) 
- 
-        def __del__(self): 
-            if self.fd >= 0: 
-                warnings.warn("unclosed file %r" % self, ResourceWarning, 
-                              source=self) 
-            self.close() 
- 
-        def recv(self, *args): 
-            return os.read(self.fd, *args) 
- 
-        def send(self, *args): 
-            return os.write(self.fd, *args) 
- 
-        def getsockopt(self, level, optname, buflen=None): 
-            if (level == socket.SOL_SOCKET and 
-                optname == socket.SO_ERROR and 
-                not buflen): 
-                return 0 
-            raise NotImplementedError("Only asyncore specific behaviour " 
-                                      "implemented.") 
- 
-        read = recv 
-        write = send 
- 
-        def close(self): 
-            if self.fd < 0: 
-                return 
-            fd = self.fd 
-            self.fd = -1 
-            os.close(fd) 
- 
-        def fileno(self): 
-            return self.fd 
- 
-    class file_dispatcher(dispatcher): 
- 
-        def __init__(self, fd, map=None): 
-            dispatcher.__init__(self, None, map) 
-            self.connected = True 
-            try: 
-                fd = fd.fileno() 
-            except AttributeError: 
-                pass 
-            self.set_file(fd) 
-            # set it to non-blocking mode 
-            os.set_blocking(fd, False) 
- 
-        def set_file(self, fd): 
-            self.socket = file_wrapper(fd) 
-            self._fileno = self.socket.fileno() 
-            self.add_channel() 
+        self.set_socket(sock)
+
+    def set_socket(self, sock, map=None):
+        self.socket = sock
+        self._fileno = sock.fileno()
+        self.add_channel(map)
+
+    def set_reuse_addr(self):
+        # try to re-use a server port if possible
+        try:
+            self.socket.setsockopt(
+                socket.SOL_SOCKET, socket.SO_REUSEADDR,
+                self.socket.getsockopt(socket.SOL_SOCKET,
+                                       socket.SO_REUSEADDR) | 1
+                )
+        except OSError:
+            pass
+
+    # ==================================================
+    # predicates for select()
+    # these are used as filters for the lists of sockets
+    # to pass to select().
+    # ==================================================
+
+    def readable(self):
+        return True
+
+    def writable(self):
+        return True
+
+    # ==================================================
+    # socket object methods.
+    # ==================================================
+
+    def listen(self, num):
+        self.accepting = True
+        if os.name == 'nt' and num > 5:
+            num = 5
+        return self.socket.listen(num)
+
+    def bind(self, addr):
+        self.addr = addr
+        return self.socket.bind(addr)
+
+    def connect(self, address):
+        self.connected = False
+        self.connecting = True
+        err = self.socket.connect_ex(address)
+        if err in (EINPROGRESS, EALREADY, EWOULDBLOCK) \
+        or err == EINVAL and os.name == 'nt':
+            self.addr = address
+            return
+        if err in (0, EISCONN):
+            self.addr = address
+            self.handle_connect_event()
+        else:
+            raise OSError(err, errorcode[err])
+
+    def accept(self):
+        # XXX can return either an address pair or None
+        try:
+            conn, addr = self.socket.accept()
+        except TypeError:
+            return None
+        except OSError as why:
+            if why.args[0] in (EWOULDBLOCK, ECONNABORTED, EAGAIN):
+                return None
+            else:
+                raise
+        else:
+            return conn, addr
+
+    def send(self, data):
+        try:
+            result = self.socket.send(data)
+            return result
+        except OSError as why:
+            if why.args[0] == EWOULDBLOCK:
+                return 0
+            elif why.args[0] in _DISCONNECTED:
+                self.handle_close()
+                return 0
+            else:
+                raise
+
+    def recv(self, buffer_size):
+        try:
+            data = self.socket.recv(buffer_size)
+            if not data:
+                # a closed connection is indicated by signaling
+                # a read condition, and having recv() return 0.
+                self.handle_close()
+                return b''
+            else:
+                return data
+        except OSError as why:
+            # winsock sometimes raises ENOTCONN
+            if why.args[0] in _DISCONNECTED:
+                self.handle_close()
+                return b''
+            else:
+                raise
+
+    def close(self):
+        self.connected = False
+        self.accepting = False
+        self.connecting = False
+        self.del_channel()
+        if self.socket is not None:
+            try:
+                self.socket.close()
+            except OSError as why:
+                if why.args[0] not in (ENOTCONN, EBADF):
+                    raise
+
+    # log and log_info may be overridden to provide more sophisticated
+    # logging and warning methods. In general, log is for 'hit' logging
+    # and 'log_info' is for informational, warning and error logging.
+
+    def log(self, message):
+        sys.stderr.write('log: %s\n' % str(message))
+
+    def log_info(self, message, type='info'):
+        if type not in self.ignore_log_types:
+            print('%s: %s' % (type, message))
+
+    def handle_read_event(self):
+        if self.accepting:
+            # accepting sockets are never connected, they "spawn" new
+            # sockets that are connected
+            self.handle_accept()
+        elif not self.connected:
+            if self.connecting:
+                self.handle_connect_event()
+            self.handle_read()
+        else:
+            self.handle_read()
+
+    def handle_connect_event(self):
+        err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
+        if err != 0:
+            raise OSError(err, _strerror(err))
+        self.handle_connect()
+        self.connected = True
+        self.connecting = False
+
+    def handle_write_event(self):
+        if self.accepting:
+            # Accepting sockets shouldn't get a write event.
+            # We will pretend it didn't happen.
+            return
+
+        if not self.connected:
+            if self.connecting:
+                self.handle_connect_event()
+        self.handle_write()
+
+    def handle_expt_event(self):
+        # handle_expt_event() is called if there might be an error on the
+        # socket, or if there is OOB data
+        # check for the error condition first
+        err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
+        if err != 0:
+            # we can get here when select.select() says that there is an
+            # exceptional condition on the socket
+            # since there is an error, we'll go ahead and close the socket
+            # like we would in a subclassed handle_read() that received no
+            # data
+            self.handle_close()
+        else:
+            self.handle_expt()
+
+    def handle_error(self):
+        nil, t, v, tbinfo = compact_traceback()
+
+        # sometimes a user repr method will crash.
+        try:
+            self_repr = repr(self)
+        except:
+            self_repr = '<__repr__(self) failed for object at %0x>' % id(self)
+
+        self.log_info(
+            'uncaptured python exception, closing channel %s (%s:%s %s)' % (
+                self_repr,
+                t,
+                v,
+                tbinfo
+                ),
+            'error'
+            )
+        self.handle_close()
+
+    def handle_expt(self):
+        self.log_info('unhandled incoming priority event', 'warning')
+
+    def handle_read(self):
+        self.log_info('unhandled read event', 'warning')
+
+    def handle_write(self):
+        self.log_info('unhandled write event', 'warning')
+
+    def handle_connect(self):
+        self.log_info('unhandled connect event', 'warning')
+
+    def handle_accept(self):
+        pair = self.accept()
+        if pair is not None:
+            self.handle_accepted(*pair)
+
+    def handle_accepted(self, sock, addr):
+        sock.close()
+        self.log_info('unhandled accepted event', 'warning')
+
+    def handle_close(self):
+        self.log_info('unhandled close event', 'warning')
+        self.close()
+
+# ---------------------------------------------------------------------------
+# adds simple buffered output capability, useful for simple clients.
+# [for more sophisticated usage use asynchat.async_chat]
+# ---------------------------------------------------------------------------
+
+class dispatcher_with_send(dispatcher):
+
+    def __init__(self, sock=None, map=None):
+        dispatcher.__init__(self, sock, map)
+        self.out_buffer = b''
+
+    def initiate_send(self):
+        num_sent = 0
+        num_sent = dispatcher.send(self, self.out_buffer[:65536])
+        self.out_buffer = self.out_buffer[num_sent:]
+
+    def handle_write(self):
+        self.initiate_send()
+
+    def writable(self):
+        return (not self.connected) or len(self.out_buffer)
+
+    def send(self, data):
+        if self.debug:
+            self.log_info('sending %s' % repr(data))
+        self.out_buffer = self.out_buffer + data
+        self.initiate_send()
+
+# ---------------------------------------------------------------------------
+# used for debugging.
+# ---------------------------------------------------------------------------
+
+def compact_traceback():
+    t, v, tb = sys.exc_info()
+    tbinfo = []
+    if not tb: # Must have a traceback
+        raise AssertionError("traceback does not exist")
+    while tb:
+        tbinfo.append((
+            tb.tb_frame.f_code.co_filename,
+            tb.tb_frame.f_code.co_name,
+            str(tb.tb_lineno)
+            ))
+        tb = tb.tb_next
+
+    # just to be safe
+    del tb
+
+    file, function, line = tbinfo[-1]
+    info = ' '.join(['[%s|%s|%s]' % x for x in tbinfo])
+    return (file, function, line), t, v, info
+
+def close_all(map=None, ignore_all=False):
+    if map is None:
+        map = socket_map
+    for x in list(map.values()):
+        try:
+            x.close()
+        except OSError as x:
+            if x.args[0] == EBADF:
+                pass
+            elif not ignore_all:
+                raise
+        except _reraised_exceptions:
+            raise
+        except:
+            if not ignore_all:
+                raise
+    map.clear()
+
+# Asynchronous File I/O:
+#
+# After a little research (reading man pages on various unixen, and
+# digging through the linux kernel), I've determined that select()
+# isn't meant for doing asynchronous file i/o.
+# Heartening, though - reading linux/mm/filemap.c shows that linux
+# supports asynchronous read-ahead.  So _MOST_ of the time, the data
+# will be sitting in memory for us already when we go to read it.
+#
+# What other OS's (besides NT) support async file i/o?  [VMS?]
+#
+# Regardless, this is useful for pipes, and stdin/stdout...
+
+if os.name == 'posix':
+    class file_wrapper:
+        # Here we override just enough to make a file
+        # look like a socket for the purposes of asyncore.
+        # The passed fd is automatically os.dup()'d
+
+        def __init__(self, fd):
+            self.fd = os.dup(fd)
+
+        def __del__(self):
+            if self.fd >= 0:
+                warnings.warn("unclosed file %r" % self, ResourceWarning,
+                              source=self)
+            self.close()
+
+        def recv(self, *args):
+            return os.read(self.fd, *args)
+
+        def send(self, *args):
+            return os.write(self.fd, *args)
+
+        def getsockopt(self, level, optname, buflen=None):
+            if (level == socket.SOL_SOCKET and
+                optname == socket.SO_ERROR and
+                not buflen):
+                return 0
+            raise NotImplementedError("Only asyncore specific behaviour "
+                                      "implemented.")
+
+        read = recv
+        write = send
+
+        def close(self):
+            if self.fd < 0:
+                return
+            fd = self.fd
+            self.fd = -1
+            os.close(fd)
+
+        def fileno(self):
+            return self.fd
+
+    class file_dispatcher(dispatcher):
+
+        def __init__(self, fd, map=None):
+            dispatcher.__init__(self, None, map)
+            self.connected = True
+            try:
+                fd = fd.fileno()
+            except AttributeError:
+                pass
+            self.set_file(fd)
+            # set it to non-blocking mode
+            os.set_blocking(fd, False)
+
+        def set_file(self, fd):
+            self.socket = file_wrapper(fd)
+            self._fileno = self.socket.fileno()
+            self.add_channel()