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      1 #ifndef __ASM_GENERIC_MSGBUF_H
      2 #define __ASM_GENERIC_MSGBUF_H
      3 
      4 #include <asm/bitsperlong.h>
      5 /*
      6  * generic msqid64_ds structure.
      7  *
      8  * Note extra padding because this structure is passed back and forth
      9  * between kernel and user space.
     10  *
     11  * msqid64_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 three 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 
     24 struct msqid64_ds {
     25 	struct ipc64_perm msg_perm;
     26 	__kernel_time_t msg_stime;	/* last msgsnd time */
     27 #if __BITS_PER_LONG != 64
     28 	unsigned long	__unused1;
     29 #endif
     30 	__kernel_time_t msg_rtime;	/* last msgrcv time */
     31 #if __BITS_PER_LONG != 64
     32 	unsigned long	__unused2;
     33 #endif
     34 	__kernel_time_t msg_ctime;	/* last change time */
     35 #if __BITS_PER_LONG != 64
     36 	unsigned long	__unused3;
     37 #endif
     38 	__kernel_ulong_t msg_cbytes;	/* current number of bytes on queue */
     39 	__kernel_ulong_t msg_qnum;	/* number of messages in queue */
     40 	__kernel_ulong_t msg_qbytes;	/* max number of bytes on queue */
     41 	__kernel_pid_t msg_lspid;	/* pid of last msgsnd */
     42 	__kernel_pid_t msg_lrpid;	/* last receive pid */
     43 	__kernel_ulong_t __unused4;
     44 	__kernel_ulong_t __unused5;
     45 };
     46 
     47 #endif /* __ASM_GENERIC_MSGBUF_H */
     48