| Arnd Bergmann | 2864d32 | 2009-05-13 22:56:26 +0000 | [diff] [blame] | 1 | #ifndef __ASM_GENERIC_SHMBUF_H |
| 2 | #define __ASM_GENERIC_SHMBUF_H |
| 3 | |
| 4 | #include <asm/bitsperlong.h> |
| 5 | |
| 6 | /* |
| 7 | * The shmid64_ds structure for x86 architecture. |
| 8 | * Note extra padding because this structure is passed back and forth |
| 9 | * between kernel and user space. |
| 10 | * |
| 11 | * shmid64_ds was originally meant to be architecture specific, but |
| 12 | * everyone just ended up making identical copies without specific |
| 13 | * optimizations, so we may just as well all use the same one. |
| 14 | * |
| 15 | * 64 bit architectures typically define a 64 bit __kernel_time_t, |
| 16 | * so they do not need the first two padding words. |
| 17 | * On big-endian systems, the padding is in the wrong place. |
| 18 | * |
| 19 | * |
| 20 | * Pad space is left for: |
| 21 | * - 64-bit time_t to solve y2038 problem |
| 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 | __kernel_time_t shm_atime; /* last attach time */ |
| 29 | #if __BITS_PER_LONG != 64 |
| 30 | unsigned long __unused1; |
| 31 | #endif |
| 32 | __kernel_time_t shm_dtime; /* last detach time */ |
| 33 | #if __BITS_PER_LONG != 64 |
| 34 | unsigned long __unused2; |
| 35 | #endif |
| 36 | __kernel_time_t shm_ctime; /* last change time */ |
| 37 | #if __BITS_PER_LONG != 64 |
| 38 | unsigned long __unused3; |
| 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 */ |