1/* Define where padding goes in struct shmid_ds. Generic version.
2 Copyright (C) 2018-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _SYS_SHM_H
20# error "Never use <bits/shm-pad.h> directly; include <sys/shm.h> instead."
21#endif
22
23#include <bits/timesize.h>
24
25/* On most architectures, padding goes after time fields for 32-bit
26 systems and is omitted for 64-bit systems. Some architectures pad
27 before time fields instead, or omit padding despite being 32-bit,
28 or include it despite being 64-bit. Furthermore, some
29 architectures place shm_segsz after the time fields rather than
30 before them, with or without padding there. This must match the
31 layout used for struct shmid64_ds in <asm/shmbuf.h>, as glibc does
32 not do layout conversions for this structure. */
33
34#define __SHM_PAD_AFTER_TIME (__TIMESIZE == 32)
35#define __SHM_PAD_BEFORE_TIME 0
36#define __SHM_SEGSZ_AFTER_TIME 0
37#define __SHM_PAD_BETWEEN_TIME_AND_SEGSZ 0
38