1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux <<
2 #ifndef __ASM_GENERIC_SHMBUF_H 1 #ifndef __ASM_GENERIC_SHMBUF_H
3 #define __ASM_GENERIC_SHMBUF_H 2 #define __ASM_GENERIC_SHMBUF_H
4 3
5 #include <asm/bitsperlong.h> 4 #include <asm/bitsperlong.h>
6 #include <asm/ipcbuf.h> <<
7 #include <asm/posix_types.h> <<
8 5
9 /* 6 /*
10 * The shmid64_ds structure for x86 architectu 7 * The shmid64_ds structure for x86 architecture.
11 * Note extra padding because this structure i 8 * Note extra padding because this structure is passed back and forth
12 * between kernel and user space. 9 * between kernel and user space.
13 * 10 *
14 * shmid64_ds was originally meant to be archi 11 * shmid64_ds was originally meant to be architecture specific, but
15 * everyone just ended up making identical cop 12 * everyone just ended up making identical copies without specific
16 * optimizations, so we may just as well all u 13 * optimizations, so we may just as well all use the same one.
17 * 14 *
18 * 64 bit architectures use a 64-bit long time !! 15 * 64 bit architectures typically define a 64 bit __kernel_time_t,
19 * 32 bit architectures have a pair of unsigne !! 16 * so they do not need the first two padding words.
20 * On big-endian systems, the lower half is in !! 17 * On big-endian systems, the padding is in the wrong place.
21 * 18 *
22 * 19 *
23 * Pad space is left for: 20 * Pad space is left for:
>> 21 * - 64-bit time_t to solve y2038 problem
24 * - 2 miscellaneous 32-bit values 22 * - 2 miscellaneous 32-bit values
25 */ 23 */
26 24
27 struct shmid64_ds { 25 struct shmid64_ds {
28 struct ipc64_perm shm_perm; 26 struct ipc64_perm shm_perm; /* operation perms */
29 __kernel_size_t shm_segsz; !! 27 size_t shm_segsz; /* size of segment (bytes) */
30 #if __BITS_PER_LONG == 64 !! 28 __kernel_time_t shm_atime; /* last attach time */
31 long shm_atime; !! 29 #if __BITS_PER_LONG != 64
32 long shm_dtime; !! 30 unsigned long __unused1;
33 long shm_ctime; !! 31 #endif
34 #else !! 32 __kernel_time_t shm_dtime; /* last detach time */
35 unsigned long shm_atime; !! 33 #if __BITS_PER_LONG != 64
36 unsigned long shm_atime_high !! 34 unsigned long __unused2;
37 unsigned long shm_dtime; !! 35 #endif
38 unsigned long shm_dtime_high !! 36 __kernel_time_t shm_ctime; /* last change time */
39 unsigned long shm_ctime; !! 37 #if __BITS_PER_LONG != 64
40 unsigned long shm_ctime_high !! 38 unsigned long __unused3;
41 #endif 39 #endif
42 __kernel_pid_t shm_cpid; 40 __kernel_pid_t shm_cpid; /* pid of creator */
43 __kernel_pid_t shm_lpid; 41 __kernel_pid_t shm_lpid; /* pid of last operator */
44 unsigned long shm_nattch; 42 unsigned long shm_nattch; /* no. of current attaches */
45 unsigned long __unused4; 43 unsigned long __unused4;
46 unsigned long __unused5; 44 unsigned long __unused5;
47 }; 45 };
48 46
49 struct shminfo64 { 47 struct shminfo64 {
50 unsigned long shmmax; !! 48 unsigned long shmmax;
51 unsigned long shmmin; !! 49 unsigned long shmmin;
52 unsigned long shmmni; !! 50 unsigned long shmmni;
53 unsigned long shmseg; !! 51 unsigned long shmseg;
54 unsigned long shmall; !! 52 unsigned long shmall;
55 unsigned long __unused1; !! 53 unsigned long __unused1;
56 unsigned long __unused2; !! 54 unsigned long __unused2;
57 unsigned long __unused3; !! 55 unsigned long __unused3;
58 unsigned long __unused4; !! 56 unsigned long __unused4;
59 }; 57 };
60 58
61 #endif /* __ASM_GENERIC_SHMBUF_H */ 59 #endif /* __ASM_GENERIC_SHMBUF_H */
62 60
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