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OpenSolaris 2009.06 - man page for offsetof (opensolaris section 3c)

offsetof(3C)						   Standard C Library Functions 					      offsetof(3C)

NAME
offsetof - offset of structure member
SYNOPSIS
#include <stddef.h> size_t offsetof(type, member-designator);
DESCRIPTION
The offsetof() macro defined in <stddef.h> expands to an integral constant expression that has type size_t. The value of this expression is the offset in bytes to the structure member (designated by member-designator) from the beginning of its structure (designated by type).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+
SEE ALSO
attributes(5) SunOS 5.11 29 Dec 1996 offsetof(3C)