Root/include/asm-generic/sembuf.h

1#ifndef __ASM_GENERIC_SEMBUF_H
2#define __ASM_GENERIC_SEMBUF_H
3
4#include <asm/bitsperlong.h>
5
6/*
7 * The semid64_ds structure for x86 architecture.
8 * Note extra padding because this structure is passed back and forth
9 * between kernel and user space.
10 *
11 * semid64_ds was originally meant to be architecture specific, but
12 * everyone just ended up making identical copies without specific
13 * optimizations, so we may just as well all use the same one.
14 *
15 * 64 bit architectures typically define a 64 bit __kernel_time_t,
16 * so they do not need the first two padding words.
17 * On big-endian systems, the padding is in the wrong place.
18 *
19 * Pad space is left for:
20 * - 64-bit time_t to solve y2038 problem
21 * - 2 miscellaneous 32-bit values
22 */
23struct semid64_ds {
24    struct ipc64_perm sem_perm; /* permissions .. see ipc.h */
25    __kernel_time_t sem_otime; /* last semop time */
26#if __BITS_PER_LONG != 64
27    unsigned long __unused1;
28#endif
29    __kernel_time_t sem_ctime; /* last change time */
30#if __BITS_PER_LONG != 64
31    unsigned long __unused2;
32#endif
33    unsigned long sem_nsems; /* no. of semaphores in array */
34    unsigned long __unused3;
35    unsigned long __unused4;
36};
37
38#endif /* __ASM_GENERIC_SEMBUF_H */
39

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