* Rename check_socket_and_wait_for_timeout() to PySSL_select()
* PySSL_select() is now clearly splitted betwen poll() and select()
* Add empty lines for readability

* 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.

Fix also _Py_InitializeEx_Private(): initialize time before initializing
import, import_init() uses the _PyTime API (for thread locks).

@unittest.skipUnless(ssl, '...') doesn't work because the class body uses the
nntplib.NNTP_SSL attribute which doesn't exist.

Made test XML files non-ASCII.

Made test XML files non-ASCII.

arbitrary precision integers added in Tcl 8.5.

arbitrary precision integers added in Tcl 8.5.

store the result of sendto() instead of the C int type.

(The bug was already fixed in the default branch, but differently.)

result of sendto() instead of the C int type.

See the PEP 475 for the rationale.

sock_call_ex() gets the socket error code when the socket function fails.
sock_connect_impl() didn't set the error correctly.

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.

Patch by Martin Panter.

Patch by Martin Panter.

Patch by Cédric Krier.

sock_send_impl()

The BEGIN_SELECT_LOOP and END_SELECT_LOOP macros of socketmodule.c don't handle
EINTR. Functions using these macros use an inner loop to handle EINTR, but they
don't recompute the timeout.

This changes replaces the two macros with a new sock_call() function which
takes a function as a parameter. sock_call() recomputes the timeout, handle
false positive and handle EINTR.

to its signal handlers.

Use also _Py_write_noraise() instead of write() to retry write() if it is
interrupted by a signal (fail with EINTR).

faulthandler.dump_traceback() also calls PyErr_CheckSignals() to call the
Python signal handler if a signal was received.