sigemptyset, sigfillset, sigaddset, sigdelset, sigismember

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sigsetops(3)	referred by	nptl(7) \| select_tut(2) \| sigaction(2) \| sigaction(2freebsd) \| sigblock(2freebsd) \| sigmask(2freebsd) \| signal(2) \| signal(7) \| signal-safety(7) \| signalfd(2) \| sigpending(2) \| sigpending(2freebsd) \| sigprocmask(2) \| sigprocmask(2freebsd) \| sigsetmask(2freebsd) \| sigsuspend(2) \| sigsuspend(2freebsd) \| sigvec(2freebsd) \| sigwait(3) \| sigwaitinfo(2)
sigsetops(3)	refer to	attributes(7) \| feature_test_macros(7) \| nptl(7) \| sigaction(2) \| sigpending(2) \| sigprocmask(2) \| sigsuspend(2)