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__END_DECLS
166#endif /* !_KERNEL */
167
168#endif /* !_SYS_MSG_H_ */