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OFFSETOF(3) FreeBSD Library Functions Manual OFFSETOF(3)
NAME offsetof - offset of a structure member
SYNOPSIS #include <stddef.h>
size_t offsetof(type, member);
DESCRIPTION The offsetof() macro expands to an integer constant expression of type size_t and yields the offset, in bytes, of the field member from the start of the structure type.
A compiler error will result if member is not aligned to a byte boundary (i.e. it is a bit-field).
STANDARDS The offsetof() macro conforms to ANSI X3.159-1989 ("ANSI C89").
FreeBSD 14.0-RELEASE-p11 February 18, 2010 FreeBSD 14.0-RELEASE-p11