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