HPUX sigblock[2]

 sigblock(2)                                                     sigblock(2)





 NAME
      sigblock - block signals

 SYNOPSIS
      #include <signal.h>

      long sigblock(long mask);

 DESCRIPTION
      sigblock() 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 i-th bit in mask is 1, as specified with the macro sigmask(i).

      It is not possible to block signals that cannot be ignored, as
      documented in signal(5); this restriction is silently imposed by the
      system.

      Use sigsetmask() to set the mask absolutely (see sigsetmask(2)).

 RETURN VALUE
      sigblock() returns the previous set of masked signals.

 EXAMPLES
      The following call to sigblock() adds the SIGUSR1 and SIGUSR2 signals
      to the mask of signals currently blocked for the process:

           long oldmask;

           oldmask = sigblock (sigmask (SIGUSR1) | sigmask (SIGUSR2));

 WARNINGS
      Do not use sigblock() in conjunction with the facilities described
      under sigset(2V).

 AUTHOR
      sigblock() was developed by the University of California, Berkeley.

 SEE ALSO
      kill(2), sigprocmask(2), sigsetmask(2), sigvector(2).















 Hewlett-Packard Company            - 1 -     HP-UX Release 9.0: August 1992