Release 4.7 include/linux/msg.h

#ifndef _LINUX_MSG_H

#define _LINUX_MSG_H

#include <linux/list.h>
#include <uapi/linux/msg.h>

/* one msg_msg structure for each message */

struct msg_msg {
	
struct list_head m_list;
	
long m_type;
	
size_t m_ts;		/* message text size */
	
struct msg_msgseg *next;
	
void *security;
	/* the actual message follows immediately */
};

/* one msq_queue structure for each present queue on the system */

struct msg_queue {
	
struct kern_ipc_perm q_perm;
	
time_t q_stime;			/* last msgsnd time */
	
time_t q_rtime;			/* last msgrcv time */
	
time_t q_ctime;			/* last change time */
	
unsigned long q_cbytes;		/* current number of bytes on queue */
	
unsigned long q_qnum;		/* number of messages in queue */
	
unsigned long q_qbytes;		/* max number of bytes on queue */
	
pid_t q_lspid;			/* pid of last msgsnd */
	
pid_t q_lrpid;			/* last receive pid */

	
struct list_head q_messages;
	
struct list_head q_receivers;
	
struct list_head q_senders;
};

/* Helper routines for sys_msgsnd and sys_msgrcv */
extern long do_msgsnd(int msqid, long mtype, void __user *mtext,
			size_t msgsz, int msgflg);
extern long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
		      int msgflg,
		      long (*msg_fill)(void __user *, struct msg_msg *,
				       size_t));

#endif /* _LINUX_MSG_H */
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