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

[Adhemerval Zanella]

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

Also keep in mind that POSIX [1] specifies that sigaddset *may* fail with EINVAL for not support signals, so a conforming implementation may not fail on sigaddset and still remove the internal signal in a sigprocmask (uclibc for instance).

[1] http://pubs.opengroup.org/onlinepubs/9699919799/

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