include/asm-generic/sembuf.h

   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 */