[issue22042] signal.set_wakeup_fd(fd): raise an exception if the fd is in blocking mode

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at gmail.com>:


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title: signal.set_wakeup_fd(fd): set the fd to non-blocking mode -> signal.set_wakeup_fd(fd): raise an exception if the fd is in blocking mode

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22042>
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