Root/include/asm-generic/shmbuf.h

1#ifndef __ASM_GENERIC_SHMBUF_H
2#define __ASM_GENERIC_SHMBUF_H
3
4#include <asm/bitsperlong.h>
5
6/*
7 * The shmid64_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 * shmid64_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 *
20 * Pad space is left for:
21 * - 64-bit time_t to solve y2038 problem
22 * - 2 miscellaneous 32-bit values
23 */
24
25struct shmid64_ds {
26    struct ipc64_perm shm_perm; /* operation perms */
27    size_t shm_segsz; /* size of segment (bytes) */
28    __kernel_time_t shm_atime; /* last attach time */
29#if __BITS_PER_LONG != 64
30    unsigned long __unused1;
31#endif
32    __kernel_time_t shm_dtime; /* last detach time */
33#if __BITS_PER_LONG != 64
34    unsigned long __unused2;
35#endif
36    __kernel_time_t shm_ctime; /* last change time */
37#if __BITS_PER_LONG != 64
38    unsigned long __unused3;
39#endif
40    __kernel_pid_t shm_cpid; /* pid of creator */
41    __kernel_pid_t shm_lpid; /* pid of last operator */
42    unsigned long shm_nattch; /* no. of current attaches */
43    unsigned long __unused4;
44    unsigned long __unused5;
45};
46
47struct shminfo64 {
48    unsigned long shmmax;
49    unsigned long shmmin;
50    unsigned long shmmni;
51    unsigned long shmseg;
52    unsigned long shmall;
53    unsigned long __unused1;
54    unsigned long __unused2;
55    unsigned long __unused3;
56    unsigned long __unused4;
57};
58
59#endif /* __ASM_GENERIC_SHMBUF_H */
60

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