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Linux/include/uapi/asm-generic/sembuf.h

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  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 */
 39 

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