[issue33329] sigaddset() can fail on some signal numbers

[Adhemerval Zanella]

Adhemerval Zanella <zatrazz at gmail.com> added the comment:

Yes I am aware, but I can't see a really portable way to provide the same functionality as 'sigfillset'.  Ideally a libc implementation would return EINVAL on 'sigaddset' for invalid signals, but even for glibc this is not true (the very issue I fixed).

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<https://bugs.python.org/issue33329>
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