1#ifndef _LINUX_MSG_H
2#define _LINUX_MSG_H
3
4#include <linux/ipc.h>
5
6/* ipcs ctl commands */
7#define MSG_STAT 11
8#define MSG_INFO 12
9
10/* msgrcv options */
11#define MSG_NOERROR     010000  /* no error if message is too big */
12#define MSG_EXCEPT      020000  /* recv any msg except of specified type.*/
13
14/* Obsolete, used only for backwards compatibility and libc5 compiles */
15struct msqid_ds {
16	struct ipc_perm msg_perm;
17	struct msg *msg_first;		/* first message on queue,unused  */
18	struct msg *msg_last;		/* last message in queue,unused */
19	__kernel_time_t msg_stime;	/* last msgsnd time */
20	__kernel_time_t msg_rtime;	/* last msgrcv time */
21	__kernel_time_t msg_ctime;	/* last change time */
22	unsigned long  msg_lcbytes;	/* Reuse junk fields for 32 bit */
23	unsigned long  msg_lqbytes;	/* ditto */
24	unsigned short msg_cbytes;	/* current number of bytes on queue */
25	unsigned short msg_qnum;	/* number of messages in queue */
26	unsigned short msg_qbytes;	/* max number of bytes on queue */
27	__kernel_ipc_pid_t msg_lspid;	/* pid of last msgsnd */
28	__kernel_ipc_pid_t msg_lrpid;	/* last receive pid */
29};
30
31/* Include the definition of msqid64_ds */
32#include <asm/msgbuf.h>
33
34/* message buffer for msgsnd and msgrcv calls */
35struct msgbuf {
36	long mtype;         /* type of message */
37	char mtext[1];      /* message text */
38};
39
40/* buffer for msgctl calls IPC_INFO, MSG_INFO */
41struct msginfo {
42	int msgpool;
43	int msgmap;
44	int msgmax;
45	int msgmnb;
46	int msgmni;
47	int msgssz;
48	int msgtql;
49	unsigned short  msgseg;
50};
51
52#define MSGMNI    16   /* <= IPCMNI */     /* max # of msg queue identifiers */
53#define MSGMAX  8192   /* <= INT_MAX */   /* max size of message (bytes) */
54#define MSGMNB 16384   /* <= INT_MAX */   /* default max size of a message queue */
55
56/* unused */
57#define MSGPOOL (MSGMNI*MSGMNB/1024)  /* size in kilobytes of message pool */
58#define MSGTQL  MSGMNB            /* number of system message headers */
59#define MSGMAP  MSGMNB            /* number of entries in message map */
60#define MSGSSZ  16                /* message segment size */
61#define __MSGSEG ((MSGPOOL*1024)/ MSGSSZ) /* max no. of segments */
62#define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
63
64#ifdef __KERNEL__
65#include <linux/list.h>
66
67/* one msg_msg structure for each message */
68struct msg_msg {
69	struct list_head m_list;
70	long  m_type;
71	int m_ts;           /* message text size */
72	struct msg_msgseg* next;
73	void *security;
74	/* the actual message follows immediately */
75};
76
77/* one msq_queue structure for each present queue on the system */
78struct msg_queue {
79	struct kern_ipc_perm q_perm;
80	int q_id;
81	time_t q_stime;			/* last msgsnd time */
82	time_t q_rtime;			/* last msgrcv time */
83	time_t q_ctime;			/* last change time */
84	unsigned long q_cbytes;		/* current number of bytes on queue */
85	unsigned long q_qnum;		/* number of messages in queue */
86	unsigned long q_qbytes;		/* max number of bytes on queue */
87	pid_t q_lspid;			/* pid of last msgsnd */
88	pid_t q_lrpid;			/* last receive pid */
89
90	struct list_head q_messages;
91	struct list_head q_receivers;
92	struct list_head q_senders;
93};
94
95#endif /* __KERNEL__ */
96
97#endif /* _LINUX_MSG_H */
98