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BSD 2.11 - man page for sigblock (bsd section 2)

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SIGBLOCK(2)									      SIGBLOCK(2)

       sigblock - block signals

       #include <signal.h>

       omask = sigblock(mask);
       long omask, mask;

       mask = sigmask(signum)
       long mask;
       int signum;

       Sigblock  causes the signals specified in mask to be added to the set of signals currently
       being 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.

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

       The previous set of masked signals is returned.

       kill(2), sigvec(2), sigsetmask(2)

4.2 Berkeley Distribution		   May 14, 1986 			      SIGBLOCK(2)
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