* Replace "fd = -1" with "fd = INVALID_SOCKET"
* Replace "fd < 0" with "fd == INVALID_SOCKET": SOCKET_T is unsigned on Windows
Bug found by Pavel Belikov ("Fragment N1"):
http://www.viva64.com/en/b/0414/#ID0ECDAE
Issue #26227: On Windows, getnameinfo(), gethostbyaddr() and gethostbyname_ex()
functions of the socket module now decode the hostname from the ANSI code page
rather than UTF-8.
PyUnicode_AsEncodedString() instead of calling the encode() method of the
host, to handle correctly custom string with an encode() method which doesn't
return a byte string. The encoder of the IDNA codec is now called directly
instead of calling the encode() method of the string.
Use _PyTime_FromSeconds() to initialize the default socket timeout to -1
second, instead of -1 nanosecond which causes rounding issues in
internal_select().
* Use the new _PyTime_FromSeconds() function to set the timeout to -1 second
for socket.settimeout(None). It avoids a special case in internal_select()
because of a rounding issue: -1 nanosecond is rounded to 0 millisecond which
means non-blocking, instead of blocking.
* Check if the interval the negative in sock_call_ex() instead of doing the
check in internal_select(). sock_call_ex() remembers if the socket has a
timeout or not, which avoids a race condition if the timeout is modified in a
different thread.
instead of raising InterruptedError if the connection is interrupted by
signals, signal handlers don't raise an exception and the socket is blocking or
has a timeout.
socket.socket.connect() still raise InterruptedError for non-blocking sockets.
