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
