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