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  Include:   <stddef.h>
 
  Syntax:    size_t offsetof( struct_name, member_name );
 
             The macro offsetof takes a structure name and a member
             name as arguments. It returns the offset in bytes of the
             specified member from the beginning of the struct.
 
             Types can be specified using the struct keyword.
 
             NOTE: offsetof is not a function and cannot be described
                   using a C prototype.
 
  Returns:   offset of member_name from beginning of structure.
             Undefined for bit fields.
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