| Ben Cheng | 30692c6 | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 1 | #ifndef __ASM_GENERIC_SEMBUF_H |
| 2 | #define __ASM_GENERIC_SEMBUF_H |
| 3 | |
| 4 | #include <asm/bitsperlong.h> |
| 5 | |
| 6 | /* |
| 7 | * The semid64_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 | * semid64_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 | * Pad space is left for: |
| 20 | * - 64-bit time_t to solve y2038 problem |
| 21 | * - 2 miscellaneous 32-bit values |
| 22 | */ |
| 23 | struct semid64_ds { |
| 24 | struct ipc64_perm sem_perm; /* permissions .. see ipc.h */ |
| 25 | __kernel_time_t sem_otime; /* last semop time */ |
| 26 | #if __BITS_PER_LONG != 64 |
| 27 | unsigned long __unused1; |
| 28 | #endif |
| 29 | __kernel_time_t sem_ctime; /* last change time */ |
| 30 | #if __BITS_PER_LONG != 64 |
| 31 | unsigned long __unused2; |
| 32 | #endif |
| 33 | unsigned long sem_nsems; /* no. of semaphores in array */ |
| 34 | unsigned long __unused3; |
| 35 | unsigned long __unused4; |
| 36 | }; |
| 37 | |
| 38 | #endif /* __ASM_GENERIC_SEMBUF_H */ |