1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef __ASM_GENERIC_SEMBUF_H
3 #define __ASM_GENERIC_SEMBUF_H
4 
5 #include <asm/bitsperlong.h>
6 
7 /*
8  * The semid64_ds structure for x86 architecture.
9  * Note extra padding because this structure is passed back and forth
10  * between kernel and user space.
11  *
12  * semid64_ds 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  * 64 bit architectures typically define a 64 bit __kernel_time_t,
17  * so they do not need the first two padding words.
18  * On big-endian systems, the padding is in the wrong place.
19  *
20  * Pad space is left for:
21  * - 64-bit time_t to solve y2038 problem
22  * - 2 miscellaneous 32-bit values
23  */
24 struct semid64_ds {
25 	struct ipc64_perm sem_perm;	/* permissions .. see ipc.h */
26 	__kernel_time_t	sem_otime;	/* last semop time */
27 #if __BITS_PER_LONG != 64
28 	unsigned long	__unused1;
29 #endif
30 	__kernel_time_t	sem_ctime;	/* last change time */
31 #if __BITS_PER_LONG != 64
32 	unsigned long	__unused2;
33 #endif
34 	unsigned long	sem_nsems;	/* no. of semaphores in array */
35 	unsigned long	__unused3;
36 	unsigned long	__unused4;
37 };
38 
39 #endif /* __ASM_GENERIC_SEMBUF_H */
40