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

#ifndef _LINUX_MSG_H
#define _LINUX_MSG_H

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

/* 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;
	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, long *pmtype, void __user *mtext,
			size_t msgsz, long msgtyp, int msgflg);

#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>
1da177e4 LT	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 */
	15	struct 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 */
	35	struct msgbuf {
	36	long mtype; /* type of message */
	37	char mtext[1]; /* message text */
	38	};
	39
	40	/* buffer for msgctl calls IPC_INFO, MSG_INFO */
	41	struct 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 (MSGMNIMSGMNB/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 ((MSGPOOL1024)/ MSGSSZ) / max no. of segments */
	62	#define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
	63
	64	#ifdef __KERNEL__
77597ad6	65	#include <linux/list.h>
1da177e4 LT	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;
	80	time_t q_stime; /* last msgsnd time */
	81	time_t q_rtime; /* last msgrcv time */
	82	time_t q_ctime; /* last change time */
	83	unsigned long q_cbytes; /* current number of bytes on queue */
	84	unsigned long q_qnum; /* number of messages in queue */
	85	unsigned long q_qbytes; /* max number of bytes on queue */
	86	pid_t q_lspid; /* pid of last msgsnd */
	87	pid_t q_lrpid; /* last receive pid */
	88
	89	struct list_head q_messages;
	90	struct list_head q_receivers;
	91	struct list_head q_senders;
	92	};
	93
651971cb	94	/* Helper routines for sys_msgsnd and sys_msgrcv */
	95	extern long do_msgsnd(int msqid, long mtype, void __user *mtext,
	96	size_t msgsz, int msgflg);
	97	extern long do_msgrcv(int msqid, long pmtype, void __user mtext,
	98	size_t msgsz, long msgtyp, int msgflg);
	99
1da177e4 LT	100	#endif /* __KERNEL__ */
	101
	102	#endif /* _LINUX_MSG_H */