sigblock(2) — DG/UX 4.30



     sigblock(2)                DG/UX 4.30                 sigblock(2)



     NAME
          sigblock - Add to set of blocked signals.

     SYNOPSIS
          #include <signal.h>

          long    sigblock (signal_mask)
          long    signal_mask;

     PARAMETERS
          signal_mask    Set of additional signals to block.

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

          It is not possible to block SIGKILL, SIGSTOP, or SIGCONT.
          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
          <old_signal_mask>
                         The previous set of signals being blocked
                         from presentation.

     EXCEPTIONS
          None.

     SEE ALSO
          The related system calls:  kill, sigvec, sigsetmask.



















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