Christopher Ferris | 2598113 | 2017-11-14 16:53:49 -0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 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 | * - 64-bit time_t to solve y2038 problem |
| 23 | * - 2 miscellaneous 32-bit values |
| 24 | */ |
| 25 | |
| 26 | struct shmid64_ds { |
| 27 | struct ipc64_perm shm_perm; /* operation perms */ |
| 28 | size_t shm_segsz; /* size of segment (bytes) */ |
| 29 | __kernel_time_t shm_atime; /* last attach time */ |
| 30 | #if __BITS_PER_LONG != 64 |
| 31 | unsigned long __unused1; |
| 32 | #endif |
| 33 | __kernel_time_t shm_dtime; /* last detach time */ |
| 34 | #if __BITS_PER_LONG != 64 |
| 35 | unsigned long __unused2; |
| 36 | #endif |
| 37 | __kernel_time_t shm_ctime; /* last change time */ |
| 38 | #if __BITS_PER_LONG != 64 |
| 39 | unsigned long __unused3; |
| 40 | #endif |
| 41 | __kernel_pid_t shm_cpid; /* pid of creator */ |
| 42 | __kernel_pid_t shm_lpid; /* pid of last operator */ |
Christopher Ferris | e084501 | 2014-07-09 14:58:51 -0700 | [diff] [blame] | 43 | __kernel_ulong_t shm_nattch; /* no. of current attaches */ |
| 44 | __kernel_ulong_t __unused4; |
| 45 | __kernel_ulong_t __unused5; |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 46 | }; |
| 47 | |
| 48 | struct shminfo64 { |
Christopher Ferris | e084501 | 2014-07-09 14:58:51 -0700 | [diff] [blame] | 49 | __kernel_ulong_t shmmax; |
| 50 | __kernel_ulong_t shmmin; |
| 51 | __kernel_ulong_t shmmni; |
| 52 | __kernel_ulong_t shmseg; |
| 53 | __kernel_ulong_t shmall; |
| 54 | __kernel_ulong_t __unused1; |
| 55 | __kernel_ulong_t __unused2; |
| 56 | __kernel_ulong_t __unused3; |
| 57 | __kernel_ulong_t __unused4; |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 58 | }; |
| 59 | |
| 60 | #endif /* __ASM_GENERIC_SHMBUF_H */ |