SIGBLOCK(2)                                                        SIGBLOCK(2)



NAME
       sigblock - block signals

SYNOPSIS
       #include <signal.h>

       sigblock(mask);
       int mask;

       mask = sigmask(signum)

DESCRIPTION
       _S_i_g_b_l_o_c_k causes the signals specified in _m_a_s_k to be added to the set of
       signals currently being blocked from delivery.  Signals are blocked  if
       the  corresponding bit in _m_a_s_k is a 1; the macro _s_i_g_m_a_s_k is provided to
       construct the mask for a given _s_i_g_n_u_m.

       It is not  possible  to  block  SIGKILL,  SIGSTOP,  or  SIGCONT;   this
       restriction is silently imposed by the system.

RETURN VALUE
       The previous set of masked signals is returned.

SEE ALSO
       kill(2), sigvec(2), sigsetmask(2)



4.2 Berkeley Distribution        May 14, 1986                      SIGBLOCK(2)