1 #ifndef __ASM_GENERIC_SHMBUF_H 2 #define __ASM_GENERIC_SHMBUF_H 3 4 #include <asm/bitsperlong.h> 5 6 /* 7 * The shmid64_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 * shmid64_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 * 20 * Pad space is left for: 21 * - 64-bit time_t to solve y2038 problem 22 * - 2 miscellaneous 32-bit values 23 */ 24 25 struct shmid64_ds { 26 struct ipc64_perm shm_perm; /* operation perms */ 27 size_t shm_segsz; /* size of segment (bytes) */ 28 __kernel_time_t shm_atime; /* last attach time */ 29 #if __BITS_PER_LONG != 64 30 unsigned long __unused1; 31 #endif 32 __kernel_time_t shm_dtime; /* last detach time */ 33 #if __BITS_PER_LONG != 64 34 unsigned long __unused2; 35 #endif 36 __kernel_time_t shm_ctime; /* last change time */ 37 #if __BITS_PER_LONG != 64 38 unsigned long __unused3; 39 #endif 40 __kernel_pid_t shm_cpid; /* pid of creator */ 41 __kernel_pid_t shm_lpid; /* pid of last operator */ 42 unsigned long shm_nattch; /* no. of current attaches */ 43 unsigned long __unused4; 44 unsigned long __unused5; 45 }; 46 47 struct shminfo64 { 48 unsigned long shmmax; 49 unsigned long shmmin; 50 unsigned long shmmni; 51 unsigned long shmseg; 52 unsigned long shmall; 53 unsigned long __unused1; 54 unsigned long __unused2; 55 unsigned long __unused3; 56 unsigned long __unused4; 57 }; 58 59 #endif /* __ASM_GENERIC_SHMBUF_H */ 60