1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
2 | #ifndef __ASM_GENERIC_SHMBUF_H |
3 | #define __ASM_GENERIC_SHMBUF_H |
4 | |
5 | #include <asm/bitsperlong.h> |
6 | |
7 | /* |
8 | * The shmid64_ds structure for x86 architecture. |
9 | * Note extra padding because this structure is passed back and forth |
10 | * between kernel and user space. |
11 | * |
12 | * shmid64_ds was originally meant to be architecture specific, but |
13 | * everyone just ended up making identical copies without specific |
14 | * optimizations, so we may just as well all use the same one. |
15 | * |
16 | * 64 bit architectures typically define a 64 bit __kernel_time_t, |
17 | * so they do not need the first two padding words. |
18 | * On big-endian systems, the padding is in the wrong place. |
19 | * |
20 | * |
21 | * Pad space is left for: |
22 | * - 2 miscellaneous 32-bit values |
23 | */ |
24 | |
25 | struct shmid64_ds { |
26 | struct ipc64_perm shm_perm; /* operation perms */ |
27 | size_t shm_segsz; /* size of segment (bytes) */ |
28 | #if __BITS_PER_LONG == 64 |
29 | __kernel_time_t shm_atime; /* last attach time */ |
30 | __kernel_time_t shm_dtime; /* last detach time */ |
31 | __kernel_time_t shm_ctime; /* last change time */ |
32 | #else |
33 | unsigned long shm_atime; /* last attach time */ |
34 | unsigned long shm_atime_high; |
35 | unsigned long shm_dtime; /* last detach time */ |
36 | unsigned long shm_dtime_high; |
37 | unsigned long shm_ctime; /* last change time */ |
38 | unsigned long shm_ctime_high; |
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 | |
47 | struct 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 | |