[3.6] Mention how to disable signal fd wakeup (GH-2140) (#2149)

pitrou · web-flow · commit d0d63dc1e8a2 · 2017-06-13T10:23:13.000+02:00
(cherry picked from commit d79c1d4)
diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst
@@ -306,8 +306,10 @@ The :mod:`signal` module defines the following functions:
    a library to wakeup a poll or select call, allowing the signal to be fully
    processed.
 
-   The old wakeup fd is returned.  *fd* must be non-blocking.  It is up to the
-   library to remove any bytes before calling poll or select again.
+   The old wakeup fd is returned (or -1 if file descriptor wakeup was not
+   enabled).  If *fd* is -1, file descriptor wakeup is disabled.
+   If not -1, *fd* must be non-blocking.  It is up to the library to remove
+   any bytes from *fd* before calling poll or select again.
 
    Use for example ``struct.unpack('%uB' % len(data), data)`` to decode the
    signal numbers list.
