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

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  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         __kernel_ulong_t        shm_nattch;     /* no. of current attaches */
 43         __kernel_ulong_t        __unused4;
 44         __kernel_ulong_t        __unused5;
 45 };
 46 
 47 struct shminfo64 {
 48         __kernel_ulong_t        shmmax;
 49         __kernel_ulong_t        shmmin;
 50         __kernel_ulong_t        shmmni;
 51         __kernel_ulong_t        shmseg;
 52         __kernel_ulong_t        shmall;
 53         __kernel_ulong_t        __unused1;
 54         __kernel_ulong_t        __unused2;
 55         __kernel_ulong_t        __unused3;
 56         __kernel_ulong_t        __unused4;
 57 };
 58 
 59 #endif /* __ASM_GENERIC_SHMBUF_H */
 60 

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