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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