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 use a 64-bit __kernel_time_t here, while
17 * 32 bit architectures have a pair of unsigned long values.
18 * so they do not need the first two padding words.
 
19 *
20 * On big-endian systems, the padding is in the wrong place for
21 * historic reasons, so user space has to reconstruct a time_t
22 * value using
23 *
24 * user_semid_ds.sem_otime = kernel_semid64_ds.sem_otime +
25 *		((long long)kernel_semid64_ds.sem_otime_high << 32)
26 *
27 * Pad space is left for 2 miscellaneous 32-bit values
28 */
29struct semid64_ds {
30	struct ipc64_perm sem_perm;	/* permissions .. see ipc.h */
31#if __BITS_PER_LONG == 64
32	__kernel_time_t	sem_otime;	/* last semop time */
 
 
 
33	__kernel_time_t	sem_ctime;	/* last change time */
34#else
35	unsigned long	sem_otime;	/* last semop time */
36	unsigned long	sem_otime_high;
37	unsigned long	sem_ctime;	/* last change time */
38	unsigned long	sem_ctime_high;
39#endif
40	unsigned long	sem_nsems;	/* no. of semaphores in array */
41	unsigned long	__unused3;
42	unsigned long	__unused4;
43};
44
45#endif /* __ASM_GENERIC_SEMBUF_H */

 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 */
24struct 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 */