1. 根目录:
2. arch
3. mn10300
4. include
5. asm
6. msgbuf.h

#ifndef _ASM_MSGBUF_H
#define _ASM_MSGBUF_H

/*
 * The msqid64_ds structure for MN10300 architecture.
 * Note extra padding because this structure is passed back and forth
 * between kernel and user space.
 *
 * 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 */
	unsigned long		__unused1;
	__kernel_time_t		msg_rtime;	/* last msgrcv time */
	unsigned long		__unused2;
	__kernel_time_t		msg_ctime;	/* last change time */
	unsigned long		__unused3;
	unsigned long		msg_cbytes;	/* current number of bytes on queue */
	unsigned long		msg_qnum;	/* number of messages in queue */
	unsigned long		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 */
	unsigned long		__unused4;
	unsigned long		__unused5;
};

#endif /* _ASM_MSGBUF_H */