| 1 |
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| 2 | #ifndef __ASM_GENERIC_SEMBUF_H
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| 3 | #define __ASM_GENERIC_SEMBUF_H
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| 4 |
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| 5 | #include <asm/bitsperlong.h>
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| 6 | #include <asm/ipcbuf.h>
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| 7 |
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| 8 | |
| 9 | * The semid64_ds structure for most architectures (though it came from x86_32
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| 10 | * originally). Note extra padding because this structure is passed back and
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| 11 | * forth between kernel and user space.
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| 12 | *
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| 13 | * semid64_ds was originally meant to be architecture specific, but
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| 14 | * everyone just ended up making identical copies without specific
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| 15 | * optimizations, so we may just as well all use the same one.
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| 16 | *
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| 17 | * 64 bit architectures use a 64-bit long time field here, while
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| 18 | * 32 bit architectures have a pair of unsigned long values.
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| 19 | *
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| 20 | * On big-endian systems, the padding is in the wrong place for
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| 21 | * historic reasons, so user space has to reconstruct a time_t
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| 22 | * value using
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| 23 | *
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| 24 | * user_semid_ds.sem_otime = kernel_semid64_ds.sem_otime +
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| 25 | * ((long long)kernel_semid64_ds.sem_otime_high << 32)
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| 26 | *
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| 27 | * Pad space is left for 2 miscellaneous 32-bit values
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| 28 |
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| 29 | struct semid64_ds {
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| 30 | struct ipc64_perm sem_perm;
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| 31 | #if __BITS_PER_LONG == 64
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| 32 | long sem_otime;
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| 33 | long sem_ctime;
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| 34 | #else
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| 35 | unsigned long sem_otime;
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| 36 | unsigned long sem_otime_high;
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| 37 | unsigned long sem_ctime;
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| 38 | unsigned long sem_ctime_high;
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| 39 | #endif
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| 40 | unsigned long sem_nsems;
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| 41 | unsigned long __unused3;
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| 42 | unsigned long __unused4;
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| 43 | };
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| 44 |
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| 45 | #endif
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