[mirror_ubuntu-bionic-kernel.git] / include / linux / msg.h

#ifndef _LINUX_MSG_H
#define _LINUX_MSG_H

#include <linux/ipc.h>
#include <linux/list.h>

/* ipcs ctl commands */
#define MSG_STAT 11
#define MSG_INFO 12

/* msgrcv options */
#define MSG_NOERROR     010000  /* no error if message is too big */
#define MSG_EXCEPT      020000  /* recv any msg except of specified type.*/

/* Obsolete, used only for backwards compatibility and libc5 compiles */
struct msqid_ds {
	struct ipc_perm msg_perm;
	struct msg *msg_first;		/* first message on queue,unused  */
	struct msg *msg_last;		/* last message in queue,unused */
	__kernel_time_t msg_stime;	/* last msgsnd time */
	__kernel_time_t msg_rtime;	/* last msgrcv time */
	__kernel_time_t msg_ctime;	/* last change time */
	unsigned long  msg_lcbytes;	/* Reuse junk fields for 32 bit */
	unsigned long  msg_lqbytes;	/* ditto */
	unsigned short msg_cbytes;	/* current number of bytes on queue */
	unsigned short msg_qnum;	/* number of messages in queue */
	unsigned short msg_qbytes;	/* max number of bytes on queue */
	__kernel_ipc_pid_t msg_lspid;	/* pid of last msgsnd */
	__kernel_ipc_pid_t msg_lrpid;	/* last receive pid */
};

/* Include the definition of msqid64_ds */
#include <asm/msgbuf.h>

/* message buffer for msgsnd and msgrcv calls */
struct msgbuf {
	long mtype;         /* type of message */
	char mtext[1];      /* message text */
};

/* buffer for msgctl calls IPC_INFO, MSG_INFO */
struct msginfo {
	int msgpool;
	int msgmap; 
	int msgmax; 
	int msgmnb; 
	int msgmni; 
	int msgssz; 
	int msgtql; 
	unsigned short  msgseg; 
};

#define MSGMNI    16   /* <= IPCMNI */     /* max # of msg queue identifiers */
#define MSGMAX  8192   /* <= INT_MAX */   /* max size of message (bytes) */
#define MSGMNB 16384   /* <= INT_MAX */   /* default max size of a message queue */

/* unused */
#define MSGPOOL (MSGMNI*MSGMNB/1024)  /* size in kilobytes of message pool */
#define MSGTQL  MSGMNB            /* number of system message headers */
#define MSGMAP  MSGMNB            /* number of entries in message map */
#define MSGSSZ  16                /* message segment size */
#define __MSGSEG ((MSGPOOL*1024)/ MSGSSZ) /* max no. of segments */
#define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)

#ifdef __KERNEL__

/* one msg_msg structure for each message */
struct msg_msg {
	struct list_head m_list; 
	long  m_type;          
	int 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;
	int q_id;
	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;
};

#endif /* __KERNEL__ */

#endif /* _LINUX_MSG_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_MSG_H
	2	#define _LINUX_MSG_H
	3
	4	#include <linux/ipc.h>
	5	#include <linux/list.h>
	6
	7	/* ipcs ctl commands */
	8	#define MSG_STAT 11
	9	#define MSG_INFO 12
	10
	11	/* msgrcv options */
	12	#define MSG_NOERROR 010000 /* no error if message is too big */
	13	#define MSG_EXCEPT 020000 /* recv any msg except of specified type.*/
	14
	15	/* Obsolete, used only for backwards compatibility and libc5 compiles */
	16	struct msqid_ds {
	17	struct ipc_perm msg_perm;
	18	struct msg msg_first; / first message on queue,unused */
	19	struct msg msg_last; / last message in queue,unused */
	20	__kernel_time_t msg_stime; /* last msgsnd time */
	21	__kernel_time_t msg_rtime; /* last msgrcv time */
	22	__kernel_time_t msg_ctime; /* last change time */
	23	unsigned long msg_lcbytes; /* Reuse junk fields for 32 bit */
	24	unsigned long msg_lqbytes; /* ditto */
	25	unsigned short msg_cbytes; /* current number of bytes on queue */
	26	unsigned short msg_qnum; /* number of messages in queue */
	27	unsigned short msg_qbytes; /* max number of bytes on queue */
	28	__kernel_ipc_pid_t msg_lspid; /* pid of last msgsnd */
	29	__kernel_ipc_pid_t msg_lrpid; /* last receive pid */
	30	};
	31
	32	/* Include the definition of msqid64_ds */
	33	#include <asm/msgbuf.h>
	34
	35	/* message buffer for msgsnd and msgrcv calls */
	36	struct msgbuf {
	37	long mtype; /* type of message */
	38	char mtext[1]; /* message text */
	39	};
	40
	41	/* buffer for msgctl calls IPC_INFO, MSG_INFO */
	42	struct msginfo {
	43	int msgpool;
	44	int msgmap;
	45	int msgmax;
	46	int msgmnb;
	47	int msgmni;
	48	int msgssz;
	49	int msgtql;
	50	unsigned short msgseg;
	51	};
	52
	53	#define MSGMNI 16 /* <= IPCMNI / / max # of msg queue identifiers */
	54	#define MSGMAX 8192 /* <= INT_MAX / / max size of message (bytes) */
	55	#define MSGMNB 16384 /* <= INT_MAX / / default max size of a message queue */
	56
	57	/* unused */
	58	#define MSGPOOL (MSGMNIMSGMNB/1024) / size in kilobytes of message pool */
	59	#define MSGTQL MSGMNB /* number of system message headers */
	60	#define MSGMAP MSGMNB /* number of entries in message map */
	61	#define MSGSSZ 16 /* message segment size */
	62	#define __MSGSEG ((MSGPOOL1024)/ MSGSSZ) / max no. of segments */
	63	#define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
	64
65	#ifdef __KERNEL__
66
67	/* one msg_msg structure for each message */
68	struct 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 */
78	struct msg_queue {
79	struct kern_ipc_perm q_perm;
19b4946c	80	int q_id;
1da177e4 LT	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 */