DESCRIPTION
.Bf -symbolic This interface is made obsolete by:
.Ef sigprocmask(2). The sigsetmask function sets the current signal mask to the specified mask. Signals are blocked from delivery if the corresponding bit in mask is a 1. The sigblock function adds the signals in the specified mask to the current signal mask, rather than overwriting it as sigsetmask does. The macro sigmask is provided to construct the mask for a given signum.
The system quietly disallows SIGKILL or SIGSTOP to be blocked.
RETURN VALUES
The sigblock and sigsetmask functions return the previous set of masked signals.
SEE ALSO
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigvec(2), sigsetops(3)
HISTORY
