9.961 sigprocmask

POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/sigprocmask.html

Gnulib module: sigprocmask

Portability problems fixed by Gnulib:

• This function is missing on some platforms: mingw, MSVC 9.

Portability problems not fixed by Gnulib: