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 | #include <asm/ipcbuf.h> |
7 | #include <asm/posix_types.h> |
8 | |
9 | /* |
10 | * The shmid64_ds structure for x86 architecture. |
11 | * Note extra padding because this structure is passed back and forth |
12 | * between kernel and user space. |
13 | * |
14 | * shmid64_ds was originally meant to be architecture specific, but |
15 | * everyone just ended up making identical copies without specific |
16 | * optimizations, so we may just as well all use the same one. |
17 | * |
18 | * 64 bit architectures use a 64-bit long time field here, while |
19 | * 32 bit architectures have a pair of unsigned long values. |
20 | * On big-endian systems, the lower half is in the wrong place. |
21 | * |
22 | * |
23 | * Pad space is left for: |
24 | * - 2 miscellaneous 32-bit values |
25 | */ |
26 | |
27 | struct shmid64_ds { |
28 | struct ipc64_perm shm_perm; /* operation perms */ |
29 | __kernel_size_t shm_segsz; /* size of segment (bytes) */ |
30 | #if __BITS_PER_LONG == 64 |
31 | long shm_atime; /* last attach time */ |
32 | long shm_dtime; /* last detach time */ |
33 | long shm_ctime; /* last change time */ |
34 | #else |
35 | unsigned long shm_atime; /* last attach time */ |
36 | unsigned long shm_atime_high; |
37 | unsigned long shm_dtime; /* last detach time */ |
38 | unsigned long shm_dtime_high; |
39 | unsigned long shm_ctime; /* last change time */ |
40 | unsigned long shm_ctime_high; |
41 | #endif |
42 | __kernel_pid_t shm_cpid; /* pid of creator */ |
43 | __kernel_pid_t shm_lpid; /* pid of last operator */ |
44 | unsigned long shm_nattch; /* no. of current attaches */ |
45 | unsigned long __unused4; |
46 | unsigned long __unused5; |
47 | }; |
48 | |
49 | struct shminfo64 { |
50 | unsigned long shmmax; |
51 | unsigned long shmmin; |
52 | unsigned long shmmni; |
53 | unsigned long shmseg; |
54 | unsigned long shmall; |
55 | unsigned long __unused1; |
56 | unsigned long __unused2; |
57 | unsigned long __unused3; |
58 | unsigned long __unused4; |
59 | }; |
60 | |
61 | #endif /* __ASM_GENERIC_SHMBUF_H */ |
62 | |