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bpo-30644: Mention how to disable signal fd wakeup #2140

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pitrou merged 1 commit into from
Jun 13, 2017
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bpo-30644: Mention how to disable signal fd wakeup #2140

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6 changes: 4 additions & 2 deletions Doc/library/signal.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -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.
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