1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef __ASM_GENERIC_IPCBUF_H
3 #define __ASM_GENERIC_IPCBUF_H
4
5 #include <linux/posix_types.h>
6
7 /*
8 * The generic ipc64_perm structure:
9 * Note extra padding because this structure is passed back and forth
10 * between kernel and user space.
11 *
12 * ipc64_perm was originally meant to be architecture specific, but
13 * everyone just ended up making identical copies without specific
14 * optimizations, so we may just as well all use the same one.
15 *
16 * Pad space is left for:
17 * - 32-bit mode_t on architectures that only had 16 bit
18 * - 32-bit seq
19 * - 2 miscellaneous 32-bit values
20 */
21
22 struct ipc64_perm {
23 __kernel_key_t key;
24 __kernel_uid32_t uid;
25 __kernel_gid32_t gid;
26 __kernel_uid32_t cuid;
27 __kernel_gid32_t cgid;
28 __kernel_mode_t mode;
29 /* pad if mode_t is u16: */
30 unsigned char __pad1[4 - sizeof(__kernel_mode_t)];
31 unsigned short seq;
32 unsigned short __pad2;
33 __kernel_ulong_t __unused1;
34 __kernel_ulong_t __unused2;
35 };
36
37 #endif /* __ASM_GENERIC_IPCBUF_H */
38
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