offset of structure member
size_t offsetof (type, member-designator);
offsetof is a macro defined in stddef.h which expands to an
integral constant expression that has type size_t, the value of which
is the offset in bytes, to the structure member (designated by
member-designator), from the beginning of its structure (designated by
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UnixWare 7 Release 7.1.4 - 25 April 2004