@section @code{sigfillset}
@findex sigfillset
-POSIX specification: @url{http://www.opengroup.org/susv3xsh/sigfillset.html}
+POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/sigfillset.html}
Gnulib module: sigprocmask