sigblock(2)                    DG/UX R4.11MU05                   sigblock(2)


NAME
       sigblock - add to set of blocked signals

SYNOPSIS
       #include <signal.h>

       long  sigblock (signalmask)
       long  signalmask;

   where:
       signalmask    Set of additional signals to block

DESCRIPTION
       Sigblock adds the set of signals specified in signalmask to the set
       of signals currently being blocked from presentation.  Signal s is
       represented by the value sigmask(s) in signalmask.

       It is not possible to block SIGKILL or SIGSTOP.  It may or may not be
       possible to block signals that are not defined by the system.  An
       attempt to block these signals will not produce an error.

ACCESS CONTROL
       None.

RETURN VALUE
       oldsignalmask   The previous set of signals being blocked from
                         presentation.

DIAGNOSTICS
       None.

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


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