--- a/env/lib/python3.7/site-packages/urllib3/util/wait.py	Thu May 14 16:47:39 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,153 +0,0 @@
-import errno
-from functools import partial
-import select
-import sys
-
-try:
-    from time import monotonic
-except ImportError:
-    from time import time as monotonic
-
-__all__ = ["NoWayToWaitForSocketError", "wait_for_read", "wait_for_write"]
-
-
-class NoWayToWaitForSocketError(Exception):
-    pass
-
-
-# How should we wait on sockets?
-#
-# There are two types of APIs you can use for waiting on sockets: the fancy
-# modern stateful APIs like epoll/kqueue, and the older stateless APIs like
-# select/poll. The stateful APIs are more efficient when you have a lots of
-# sockets to keep track of, because you can set them up once and then use them
-# lots of times. But we only ever want to wait on a single socket at a time
-# and don't want to keep track of state, so the stateless APIs are actually
-# more efficient. So we want to use select() or poll().
-#
-# Now, how do we choose between select() and poll()? On traditional Unixes,
-# select() has a strange calling convention that makes it slow, or fail
-# altogether, for high-numbered file descriptors. The point of poll() is to fix
-# that, so on Unixes, we prefer poll().
-#
-# On Windows, there is no poll() (or at least Python doesn't provide a wrapper
-# for it), but that's OK, because on Windows, select() doesn't have this
-# strange calling convention; plain select() works fine.
-#
-# So: on Windows we use select(), and everywhere else we use poll(). We also
-# fall back to select() in case poll() is somehow broken or missing.
-
-if sys.version_info >= (3, 5):
-    # Modern Python, that retries syscalls by default
-    def _retry_on_intr(fn, timeout):
-        return fn(timeout)
-
-
-else:
-    # Old and broken Pythons.
-    def _retry_on_intr(fn, timeout):
-        if timeout is None:
-            deadline = float("inf")
-        else:
-            deadline = monotonic() + timeout
-
-        while True:
-            try:
-                return fn(timeout)
-            # OSError for 3 <= pyver < 3.5, select.error for pyver <= 2.7
-            except (OSError, select.error) as e:
-                # 'e.args[0]' incantation works for both OSError and select.error
-                if e.args[0] != errno.EINTR:
-                    raise
-                else:
-                    timeout = deadline - monotonic()
-                    if timeout < 0:
-                        timeout = 0
-                    if timeout == float("inf"):
-                        timeout = None
-                    continue
-
-
-def select_wait_for_socket(sock, read=False, write=False, timeout=None):
-    if not read and not write:
-        raise RuntimeError("must specify at least one of read=True, write=True")
-    rcheck = []
-    wcheck = []
-    if read:
-        rcheck.append(sock)
-    if write:
-        wcheck.append(sock)
-    # When doing a non-blocking connect, most systems signal success by
-    # marking the socket writable. Windows, though, signals success by marked
-    # it as "exceptional". We paper over the difference by checking the write
-    # sockets for both conditions. (The stdlib selectors module does the same
-    # thing.)
-    fn = partial(select.select, rcheck, wcheck, wcheck)
-    rready, wready, xready = _retry_on_intr(fn, timeout)
-    return bool(rready or wready or xready)
-
-
-def poll_wait_for_socket(sock, read=False, write=False, timeout=None):
-    if not read and not write:
-        raise RuntimeError("must specify at least one of read=True, write=True")
-    mask = 0
-    if read:
-        mask |= select.POLLIN
-    if write:
-        mask |= select.POLLOUT
-    poll_obj = select.poll()
-    poll_obj.register(sock, mask)
-
-    # For some reason, poll() takes timeout in milliseconds
-    def do_poll(t):
-        if t is not None:
-            t *= 1000
-        return poll_obj.poll(t)
-
-    return bool(_retry_on_intr(do_poll, timeout))
-
-
-def null_wait_for_socket(*args, **kwargs):
-    raise NoWayToWaitForSocketError("no select-equivalent available")
-
-
-def _have_working_poll():
-    # Apparently some systems have a select.poll that fails as soon as you try
-    # to use it, either due to strange configuration or broken monkeypatching
-    # from libraries like eventlet/greenlet.
-    try:
-        poll_obj = select.poll()
-        _retry_on_intr(poll_obj.poll, 0)
-    except (AttributeError, OSError):
-        return False
-    else:
-        return True
-
-
-def wait_for_socket(*args, **kwargs):
-    # We delay choosing which implementation to use until the first time we're
-    # called. We could do it at import time, but then we might make the wrong
-    # decision if someone goes wild with monkeypatching select.poll after
-    # we're imported.
-    global wait_for_socket
-    if _have_working_poll():
-        wait_for_socket = poll_wait_for_socket
-    elif hasattr(select, "select"):
-        wait_for_socket = select_wait_for_socket
-    else:  # Platform-specific: Appengine.
-        wait_for_socket = null_wait_for_socket
-    return wait_for_socket(*args, **kwargs)
-
-
-def wait_for_read(sock, timeout=None):
-    """ Waits for reading to be available on a given socket.
-    Returns True if the socket is readable, or False if the timeout expired.
-    """
-    return wait_for_socket(sock, read=True, timeout=timeout)
-
-
-def wait_for_write(sock, timeout=None):
-    """ Waits for writing to be available on a given socket.
-    Returns True if the socket is readable, or False if the timeout expired.
-    """
-    return wait_for_socket(sock, write=True, timeout=timeout)