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| -rw-r--r-- | Doc/library/signal.rst | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst index 039b666..46d71de 100644 --- 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. |