1/*	$NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $	*/
2
3/*-
4 * SVID compatible msg.h file
5 *
6 * Author:  Daniel Boulet
7 *
8 * Copyright 1993 Daniel Boulet and RTMX Inc.
9 *
10 * This system call was implemented by Daniel Boulet under contract from RTMX.
11 *
12 * Redistribution and use in source forms, with and without modification,
13 * are permitted provided that this entire comment appears intact.
14 *
15 * Redistribution in binary form may occur without any restrictions.
16 * Obviously, it would be nice if you gave credit where credit is due
17 * but requiring it would be too onerous.
18 *
19 * This software is provided ``AS IS'' without any warranties of any kind.
20 */
21
22#ifndef _SYS_MSG_H_
23#define _SYS_MSG_H_
24
25#include <sys/cdefs.h>
26#include <sys/_types.h>
27#ifdef _WANT_SYSVMSG_INTERNALS
28#define	_WANT_SYSVIPC_INTERNALS
29#endif
30#include <sys/ipc.h>
31
32/*
33 * The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct
34 * are as defined by the SV API Intel 386 Processor Supplement.
35 */
36
37#define MSG_NOERROR	010000		/* don't complain about too long msgs */
38
39typedef	unsigned long	msglen_t;
40typedef	unsigned long	msgqnum_t;
41
42#ifndef _PID_T_DECLARED
43typedef	__pid_t		pid_t;
44#define	_PID_T_DECLARED
45#endif
46
47#ifndef _SIZE_T_DECLARED
48typedef	__size_t	size_t;
49#define	_SIZE_T_DECLARED
50#endif
51
52#ifndef _SSIZE_T_DECLARED
53typedef	__ssize_t	ssize_t;
54#define	_SSIZE_T_DECLARED
55#endif
56
57#ifndef _TIME_T_DECLARED
58typedef	__time_t	time_t;
59#define	_TIME_T_DECLARED
60#endif
61
62#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
63    defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
64struct msqid_ds_old {
65	struct	ipc_perm_old msg_perm;	/* msg queue permission bits */
66	struct	msg *__msg_first;	/* first message in the queue */
67	struct	msg *__msg_last;	/* last message in the queue */
68	msglen_t msg_cbytes;	/* number of bytes in use on the queue */
69	msgqnum_t msg_qnum;	/* number of msgs in the queue */
70	msglen_t msg_qbytes;	/* max # of bytes on the queue */
71	pid_t	msg_lspid;	/* pid of last msgsnd() */
72	pid_t	msg_lrpid;	/* pid of last msgrcv() */
73	time_t	msg_stime;	/* time of last msgsnd() */
74	long	msg_pad1;
75	time_t	msg_rtime;	/* time of last msgrcv() */
76	long	msg_pad2;
77	time_t	msg_ctime;	/* time of last msgctl() */
78	long	msg_pad3;
79	long	msg_pad4[4];
80};
81#endif
82
83/*
84 * XXX there seems to be no prefix reserved for this header, so the name
85 * "msg" in "struct msg" and the names of all of the nonstandard members
86 * are namespace pollution.
87 */
88
89struct msqid_ds {
90	struct	ipc_perm msg_perm;	/* msg queue permission bits */
91	struct	msg *__msg_first;	/* first message in the queue */
92	struct	msg *__msg_last;	/* last message in the queue */
93	msglen_t msg_cbytes;	/* number of bytes in use on the queue */
94	msgqnum_t msg_qnum;	/* number of msgs in the queue */
95	msglen_t msg_qbytes;	/* max # of bytes on the queue */
96	pid_t	msg_lspid;	/* pid of last msgsnd() */
97	pid_t	msg_lrpid;	/* pid of last msgrcv() */
98	time_t	msg_stime;	/* time of last msgsnd() */
99	time_t	msg_rtime;	/* time of last msgrcv() */
100	time_t	msg_ctime;	/* time of last msgctl() */
101};
102
103#ifdef _KERNEL
104struct msg {
105	struct	msg *msg_next;  /* next msg in the chain */
106	long	msg_type; 	/* type of this message */
107				/* >0 -> type of this message */
108				/* 0 -> free header */
109	u_short	msg_ts;		/* size of this message */
110	short	msg_spot;	/* location of start of msg in buffer */
111	struct	label *label;	/* MAC Framework label */
112};
113#endif
114
115#if defined(_KERNEL) || defined(_WANT_SYSVMSG_INTERNALS)
116/*
117 * Based on the configuration parameters described in an SVR2 (yes, two)
118 * config(1m) man page.
119 *
120 * Each message is broken up and stored in segments that are msgssz bytes
121 * long.  For efficiency reasons, this should be a power of two.  Also,
122 * it doesn't make sense if it is less than 8 or greater than about 256.
123 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
124 * two between 8 and 1024 inclusive (and panic's if it isn't).
125 */
126struct msginfo {
127	int	msgmax;		/* max chars in a message */
128	int	msgmni;		/* max message queue identifiers */
129	int	msgmnb;		/* max chars in a queue */
130	int	msgtql;		/* max messages in system */
131	int	msgssz;		/* size of a message segment (see note) */
132	int	msgseg;		/* number of message segments */
133};
134
135/*
136 * Kernel wrapper for the user-level structure.
137 */
138struct msqid_kernel {
139	/*
140	 * Data structure exposed to user space.
141	 */
142	struct	msqid_ds u;
143
144	/*
145	 * Kernel-private components of the message queue.
146	 */
147	struct	label *label;	/* MAC label */
148	struct	ucred *cred;	/* creator's credentials */
149};
150#endif
151
152#ifdef _KERNEL
153extern struct msginfo	msginfo;
154
155int	kern_get_msqids(struct thread *td, struct msqid_kernel **res,
156	    size_t *sz);
157
158#else /* _KERNEL */
159
160__BEGIN_DECLS
161int msgctl(int, int, struct msqid_ds *);
162int msgget(key_t, int);
163ssize_t msgrcv(int, void *, size_t, long, int);
164int msgsnd(int, const void *, size_t, int);
165#if __BSD_VISIBLE
166int msgsys(int, ...);
167#endif
168__END_DECLS
169#endif /* !_KERNEL */
170
171#endif /* !_SYS_MSG_H_ */
172