+++ /dev/null
-.\" Copyright (C) 2006 Justin Pryzby <pryzbyj@justinpryzby.com>
-.\" and Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" %%%LICENSE_START(PERMISSIVE_MISC)
-.\" Permission is hereby granted, free of charge, to any person obtaining
-.\" a copy of this software and associated documentation files (the
-.\" "Software"), to deal in the Software without restriction, including
-.\" without limitation the rights to use, copy, modify, merge, publish,
-.\" distribute, sublicense, and/or sell copies of the Software, and to
-.\" permit persons to whom the Software is furnished to do so, subject to
-.\" the following conditions:
-.\"
-.\" The above copyright notice and this permission notice shall be
-.\" included in all copies or substantial portions of the Software.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-.\" IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-.\" CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-.\" TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-.\" SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-.\" %%%LICENSE_END
-.\"
-.\" References:
-.\" /usr/lib/gcc/i486-linux-gnu/4.1.1/include/stddef.h
-.\" glibc-doc
-.TH OFFSETOF 3 2014-04-06 "GNU" "Linux Programmer's Manual"
-.SH NAME
-offsetof \- offset of a structure member
-.SH SYNOPSIS
-.nf
-.B #include <stddef.h>
-.sp
-.BI "size_t offsetof(" type ", " member );
-.fi
-.SH DESCRIPTION
-The macro
-.BR offsetof ()
-returns the offset of the field
-.I member
-from the start of the structure
-.IR type .
-
-This macro is useful because the sizes of the fields that compose
-a structure can vary across implementations,
-and compilers may insert different numbers of padding
-bytes between fields.
-Consequently, an element's offset is not necessarily
-given by the sum of the sizes of the previous elements.
-
-A compiler error will result if
-.I member
-is not aligned to a byte boundary
-(i.e., it is a bit field).
-.SH RETURN VALUE
-.BR offsetof ()
-returns the offset of the given
-.I member
-within the given
-.IR type ,
-in units of bytes.
-.SH CONFORMING TO
-C89, C99, POSIX.1-2001.
-.SH EXAMPLE
-On a Linux/i386 system, when compiled using the default
-.BR gcc (1)
-options, the program below produces the following output:
-.in +4n
-.nf
-
-.RB "$" " ./a.out"
-offsets: i=0; c=4; d=8 a=16
-sizeof(struct s)=16
-.fi
-.SS Program source
-\&
-.nf
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-int
-main(void)
-{
- struct s {
- int i;
- char c;
- double d;
- char a[];
- };
-
- /* Output is compiler dependent */
-
- printf("offsets: i=%zd; c=%zd; d=%zd a=%zd\\n",
- offsetof(struct s, i), offsetof(struct s, c),
- offsetof(struct s, d), offsetof(struct s, a));
- printf("sizeof(struct s)=%zd\\n", sizeof(struct s));
-
- exit(EXIT_SUCCESS);
-}
-.fi
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.
OSDN Git Service
