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10.1047 sigemptyset

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigemptyset.html

Gnulib module: sigprocmask

Portability problems fixed by Gnulib:

• This function is missing on some platforms: mingw, MSVC 14, Android 4.4.
• This function cannot be called from plain inline or extern inline functions on some platforms: macOS 10.8.

Portability problems not fixed by Gnulib: