| Arnd Bergmann | 2864d32 | 2009-05-13 22:56:26 +0000 | [diff] [blame] | 1 | #ifndef __ASM_GENERIC_MSGBUF_H |
| 2 | #define __ASM_GENERIC_MSGBUF_H |
| 3 | |
| 4 | #include <asm/bitsperlong.h> |
| 5 | /* |
| 6 | * generic msqid64_ds structure. |
| 7 | * |
| 8 | * Note extra padding because this structure is passed back and forth |
| 9 | * between kernel and user space. |
| 10 | * |
| 11 | * msqid64_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 three 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 | |
| 24 | struct msqid64_ds { |
| 25 | struct ipc64_perm msg_perm; |
| 26 | __kernel_time_t msg_stime; /* last msgsnd time */ |
| 27 | #if __BITS_PER_LONG != 64 |
| 28 | unsigned long __unused1; |
| 29 | #endif |
| 30 | __kernel_time_t msg_rtime; /* last msgrcv time */ |
| 31 | #if __BITS_PER_LONG != 64 |
| 32 | unsigned long __unused2; |
| 33 | #endif |
| 34 | __kernel_time_t msg_ctime; /* last change time */ |
| 35 | #if __BITS_PER_LONG != 64 |
| 36 | unsigned long __unused3; |
| 37 | #endif |
| 38 | unsigned long msg_cbytes; /* current number of bytes on queue */ |
| 39 | unsigned long msg_qnum; /* number of messages in queue */ |
| 40 | unsigned long msg_qbytes; /* max number of bytes on queue */ |
| 41 | __kernel_pid_t msg_lspid; /* pid of last msgsnd */ |
| 42 | __kernel_pid_t msg_lrpid; /* last receive pid */ |
| 43 | unsigned long __unused4; |
| 44 | unsigned long __unused5; |
| 45 | }; |
| 46 | |
| 47 | #endif /* __ASM_GENERIC_MSGBUF_H */ |