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sigblock(2)							   sigblock(2)

       sigblock	- block	signals

       int mask;

       The system call causes the signals specified in mask to be added	to the
       set of signals currently	being blocked  from  delivery.	 Signal	 i  is
       blocked if the ith bit in mask is a 1.

       It  is  not  possible to	block SIGKILL or SIGSTOP.  This	restriction is
       silently	imposed	by the system.

       The previous set	of masked signals is returned.

See Also
       kill(2),	sigsetmask(2), sigvec(2)


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