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 sigblock(2)							 sigblock(2)
			       TO BE OBSOLETED



 NAME
      sigblock - block signals

 SYNOPSIS
      #include <&lt&lt&lt;signal.h>&gt&gt&gt;

      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(3C).

    Obsolescent Interfaces
      sigblock() is to be obsoleted at a future date.

 APPLICATION USAGE
    Threads Considerations
      Since each thread maintains its own blocked signal mask, sigblock()
      modifies only the calling thread's blocked signal mask.

      For more information regarding signals and threads, refer to
      signal(5).

    LP64 Programs
      sigblock() accepts and returns long (64 bit) values.  However, as for
      ILP32 programs, sigblock() supports signals numbered 1 through 32.
      The upper 32 bits of the mask argument are ignored.  Also, the upper
      32 bits of the returned mask have no meaning.




 Hewlett-Packard Company	    - 1 -   HP-UX Release 11i: November 2000






 sigblock(2)							 sigblock(2)
			       TO BE OBSOLETED



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

 SEE ALSO
      kill(2), sigprocmask(2), sigsetmask(2), sigvector(2), signal(5).

















































 Hewlett-Packard Company	    - 2 -   HP-UX Release 11i: November 2000