Returns the address of a 64-bit signal array. A 32-bit signal
    array and a mechanism array are passed to a condition handler
    when it is called. $SIGNAL_ARRAY_64 provides the address of the
    64-bit signal array, which might be required for programs that
    use 64-bit address space.

    This service accepts 64-bit addresses.

    Format

      SYS$SIGNAL_ARRAY_64  mcharg, sigarg_64

    C Prototype

      int sys$signal_array_64  (unsigned __int64 mcharg, unsigned

                               __int64 sigarg_64);

1  –  Arguments

 mcharg

    OpenVMS usage:mechanism array
    type:         vector quadword (unsigned)
    access:       read only
    mechanism:    by 32- or 64-bit reference, array reference
    The mechanism array. The mcharg argument is the 32- or 64-bit
    address of this array, which was passed to the condition handler.
    $SIGNAL_ARRAY_64 uses this structure to determine the 64-bit
    signal array address.

 sigarg_64

    OpenVMS usage:64-bit signal array
    type:         vector quadword (unsigned)
    access:       write only
    mechanism:    by 32- or 64-bit reference, array reference
    The 32- or 64-bit address of the 64-bit signal array is returned
    in this argument.