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 */
36