root/include/uapi/asm-generic/msgbuf.h

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INCLUDED FROM

#ifndef __ASM_GENERIC_MSGBUF_H
#define __ASM_GENERIC_MSGBUF_H

#include <asm/bitsperlong.h>
/*
 * generic msqid64_ds structure.
 *
 * Note extra padding because this structure is passed back and forth
 * between kernel and user space.
 *
 * msqid64_ds was originally meant to be architecture specific, but
 * everyone just ended up making identical copies without specific
 * optimizations, so we may just as well all use the same one.
 *
 * 64 bit architectures typically define a 64 bit __kernel_time_t,
 * so they do not need the first three padding words.
 * On big-endian systems, the padding is in the wrong place.
 *
 * Pad space is left for:
 * - 64-bit time_t to solve y2038 problem
 * - 2 miscellaneous 32-bit values
 */

struct msqid64_ds {
        struct ipc64_perm msg_perm;
        __kernel_time_t msg_stime;      /* last msgsnd time */
#if __BITS_PER_LONG != 64
        unsigned long   __unused1;
#endif
        __kernel_time_t msg_rtime;      /* last msgrcv time */
#if __BITS_PER_LONG != 64
        unsigned long   __unused2;
#endif
        __kernel_time_t msg_ctime;      /* last change time */
#if __BITS_PER_LONG != 64
        unsigned long   __unused3;
#endif
        __kernel_ulong_t msg_cbytes;    /* current number of bytes on queue */
        __kernel_ulong_t msg_qnum;      /* number of messages in queue */
        __kernel_ulong_t msg_qbytes;    /* max number of bytes on queue */
        __kernel_pid_t msg_lspid;       /* pid of last msgsnd */
        __kernel_pid_t msg_lrpid;       /* last receive pid */
        __kernel_ulong_t __unused4;
        __kernel_ulong_t __unused5;
};

#endif /* __ASM_GENERIC_MSGBUF_H */
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