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