NAME
sigsetmask - set current signal mask

SYNOPSIS
#include <signal.h>

sigsetmask(mask);
int mask;

mask = sigmask(signum)

DESCRIPTION
Sigsetmask sets the current signal mask (those signals that are
blocked from delivery). Signals are blocked if the corresponding
bit in mask is a 1; the macro sigmask is provided to construct the
mask for a given signum.

The system quietly disallows SIGKILL, SIGSTOP, or SIGCONT to be
blocked.

RETURN VALUE
The previous set of masked signals is returned.

SEE ALSO
kill(2), sigvec(2), sigblock(2), sigpause(2)