1 #ifndef __ASM_GENERIC_SHMBUF_H
2 #define __ASM_GENERIC_SHMBUF_H
4 #include <asm/bitsperlong.h>
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.
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.
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.
20 * Pad space is left for:
21 * - 64-bit time_t to solve y2038 problem
22 * - 2 miscellaneous 32-bit values
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
;
32 __kernel_time_t shm_dtime
; /* last detach time */
33 #if __BITS_PER_LONG != 64
34 unsigned long __unused2
;
36 __kernel_time_t shm_ctime
; /* last change time */
37 #if __BITS_PER_LONG != 64
38 unsigned long __unused3
;
40 __kernel_pid_t shm_cpid
; /* pid of creator */
41 __kernel_pid_t shm_lpid
; /* pid of last operator */
42 __kernel_ulong_t shm_nattch
; /* no. of current attaches */
43 __kernel_ulong_t __unused4
;
44 __kernel_ulong_t __unused5
;
48 __kernel_ulong_t shmmax
;
49 __kernel_ulong_t shmmin
;
50 __kernel_ulong_t shmmni
;
51 __kernel_ulong_t shmseg
;
52 __kernel_ulong_t shmall
;
53 __kernel_ulong_t __unused1
;
54 __kernel_ulong_t __unused2
;
55 __kernel_ulong_t __unused3
;
56 __kernel_ulong_t __unused4
;
59 #endif /* __ASM_GENERIC_SHMBUF_H */