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10.1058 sigpending

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

Gnulib module: sigprocmask

Portability problems fixed by Gnulib:

• This function is missing on some platforms: mingw, MSVC 14.

Portability problems not fixed by Gnulib: