1/*
2 * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/* $NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $ */
29
30/*
31 * SVID compatible msg.h file
32 *
33 * Author: Daniel Boulet
34 *
35 * Copyright 1993 Daniel Boulet and RTMX Inc.
36 *
37 * This system call was implemented by Daniel Boulet under contract from RTMX.
38 *
39 * Redistribution and use in source forms, with and without modification,
40 * are permitted provided that this entire comment appears intact.
41 *
42 * Redistribution in binary form may occur without any restrictions.
43 * Obviously, it would be nice if you gave credit where credit is due
44 * but requiring it would be too onerous.
45 *
46 * This software is provided ``AS IS'' without any warranties of any kind.
47 */
48/*
49 * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
50 * support for mandatory and extensible security protections. This notice
51 * is included in support of clause 2.2 (b) of the Apple Public License,
52 * Version 2.0.
53 */
54
55#ifndef _SYS_MSG_H_
56#define _SYS_MSG_H_
57
58#include <sys/appleapiopts.h>
59
60#include <sys/_types.h>
61#include <sys/cdefs.h>
62
63/*
64 * [XSI] All of the symbols from <sys/ipc.h> SHALL be defined when this
65 * header is included
66 */
67#include <sys/ipc.h>
68
69
70/*
71 * [XSI] The pid_t, time_t, key_t, size_t, and ssize_t types shall be
72 * defined as described in <sys/types.h>.
73 *
74 * NOTE: The definition of the key_t type is implicit from the
75 * inclusion of <sys/ipc.h>
76 */
77#include <sys/_types/_pid_t.h>
78#include <sys/_types/_time_t.h>
79#include <sys/_types/_size_t.h>
80#include <sys/_types/_ssize_t.h>
81
82/* [XSI] Used for the number of messages in the message queue */
83typedef unsigned long msgqnum_t;
84
85/* [XSI] Used for the number of bytes allowed in a message queue */
86typedef unsigned long msglen_t;
87
88/*
89 * Possible values for the fifth parameter to msgrcv(), in addition to the
90 * IPC_NOWAIT flag, which is permitted.
91 */
92#define MSG_NOERROR 010000 /* [XSI] No error if big message */
93
94
95/*
96 * Technically, we should force all code references to the new structure
97 * definition, not in just the standards conformance case, and leave the
98 * legacy interface there for binary compatibility only. Currently, we
99 * are only forcing this for programs requesting standards conformance.
100 */
101#if __DARWIN_UNIX03 || defined(KERNEL)
102#pragma pack(4)
103/*
104 * Structure used internally.
105 *
106 * Structure whose address is passed as the third parameter to msgctl()
107 * when the second parameter is IPC_SET or IPC_STAT. In the case of the
108 * IPC_SET command, only the msg_perm.{uid|gid|perm} and msg_qbytes are
109 * honored. In the case of IPC_STAT, only the fields indicated as [XSI]
110 * mandated fields are guaranteed to meaningful: DO NOT depend on the
111 * contents of the other fields.
112 *
113 * NOTES: Reserved fields are not preserved across IPC_SET/IPC_STAT.
114 */
115#if (defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE))
116struct msqid_ds
117#else
118#define msqid_ds __msqid_ds_new
119struct __msqid_ds_new
120#endif
121{
122 struct __ipc_perm_new msg_perm; /* [XSI] msg queue permissions */
123 __int32_t msg_first; /* RESERVED: kernel use only */
124 __int32_t msg_last; /* RESERVED: kernel use only */
125 msglen_t msg_cbytes; /* # of bytes on the queue */
126 msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */
127 msglen_t msg_qbytes; /* [XSI] max bytes on the queue */
128 pid_t msg_lspid; /* [XSI] pid of last msgsnd() */
129 pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */
130 time_t msg_stime; /* [XSI] time of last msgsnd() */
131 __int32_t msg_pad1; /* RESERVED: DO NOT USE */
132 time_t msg_rtime; /* [XSI] time of last msgrcv() */
133 __int32_t msg_pad2; /* RESERVED: DO NOT USE */
134 time_t msg_ctime; /* [XSI] time of last msgctl() */
135 __int32_t msg_pad3; /* RESERVED: DO NOT USE */
136 __int32_t msg_pad4[4]; /* RESERVED: DO NOT USE */
137};
138#pragma pack()
139#else /* !__DARWIN_UNIX03 */
140#define msqid_ds __msqid_ds_old
141#endif /* !__DARWIN_UNIX03 */
142
143#if !__DARWIN_UNIX03
144struct __msqid_ds_old {
145 struct __ipc_perm_old msg_perm; /* [XSI] msg queue permissions */
146 __int32_t msg_first; /* RESERVED: kernel use only */
147 __int32_t msg_last; /* RESERVED: kernel use only */
148 msglen_t msg_cbytes; /* # of bytes on the queue */
149 msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */
150 msglen_t msg_qbytes; /* [XSI] max bytes on the queue */
151 pid_t msg_lspid; /* [XSI] pid of last msgsnd() */
152 pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */
153 time_t msg_stime; /* [XSI] time of last msgsnd() */
154 __int32_t msg_pad1; /* RESERVED: DO NOT USE */
155 time_t msg_rtime; /* [XSI] time of last msgrcv() */
156 __int32_t msg_pad2; /* RESERVED: DO NOT USE */
157 time_t msg_ctime; /* [XSI] time of last msgctl() */
158 __int32_t msg_pad3; /* RESERVED: DO NOT USE */
159 __int32_t msg_pad4[4]; /* RESERVED: DO NOT USE */
160};
161#endif /* !__DARWIN_UNIX03 */
162
163#ifdef KERNEL
164#ifdef __APPLE_API_PRIVATE
165#include <machine/types.h>
166
167#if __DARWIN_ALIGN_NATURAL
168#pragma options align=natural
169#endif
170
171typedef user_ulong_t user_msgqnum_t;
172typedef user64_ulong_t user64_msgqnum_t;
173typedef user32_ulong_t user32_msgqnum_t;
174
175typedef user_ulong_t user_msglen_t;
176typedef user64_ulong_t user64_msglen_t;
177typedef user32_ulong_t user32_msglen_t;
178
179/* kernel version */
180struct user_msqid_ds {
181 struct ipc_perm msg_perm; /* [XSI] msg queue permissions */
182 struct msg *msg_first; /* first message in the queue */
183 struct msg *msg_last; /* last message in the queue */
184 user_msglen_t msg_cbytes; /* # of bytes on the queue */
185 user_msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */
186 user_msglen_t msg_qbytes; /* [XSI] max bytes on the queue */
187 pid_t msg_lspid; /* [XSI] pid of last msgsnd() */
188 pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */
189 user_time_t msg_stime; /* [XSI] time of last msgsnd() */
190 __int32_t msg_pad1; /* RESERVED: DO NOT USE */
191 user_time_t msg_rtime; /* [XSI] time of last msgrcv() */
192 __int32_t msg_pad2; /* RESERVED: DO NOT USE */
193 user_time_t msg_ctime; /* [XSI] time of last msgctl() */
194 __int32_t msg_pad3; /* RESERVED: DO NOT USE */
195 __int32_t msg_pad4[4];
196};
197
198/*
199 * user64 version - this structure only has to be correct if
200 * compiled LP64, because the 32 bit kernel doesn't need it
201 */
202struct user64_msqid_ds {
203 struct ipc_perm msg_perm; /* [XSI] msg queue permissions */
204 __int32_t msg_first; /* RESERVED: kernel use only */
205 __int32_t msg_last; /* RESERVED: kernel use only */
206 user64_msglen_t msg_cbytes; /* # of bytes on the queue */
207 user64_msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */
208 user64_msglen_t msg_qbytes; /* [XSI] max bytes on the queue */
209 pid_t msg_lspid; /* [XSI] pid of last msgsnd() */
210 pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */
211 user64_time_t msg_stime; /* [XSI] time of last msgsnd() */
212 __int32_t msg_pad1; /* RESERVED: DO NOT USE */
213 user64_time_t msg_rtime; /* [XSI] time of last msgrcv() */
214 __int32_t msg_pad2; /* RESERVED: DO NOT USE */
215 user64_time_t msg_ctime; /* [XSI] time of last msgctl() */
216 __int32_t msg_pad3; /* RESERVED: DO NOT USE */
217 __int32_t msg_pad4[4];
218} __attribute__((__packed__));
219
220struct user32_msqid_ds {
221 struct __ipc_perm_new msg_perm; /* [XSI] msg queue permissions */
222 __int32_t msg_first; /* RESERVED: kernel use only */
223 __int32_t msg_last; /* RESERVED: kernel use only */
224 user32_msglen_t msg_cbytes; /* # of bytes on the queue */
225 user32_msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */
226 user32_msglen_t msg_qbytes; /* [XSI] max bytes on the queue */
227 pid_t msg_lspid; /* [XSI] pid of last msgsnd() */
228 pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */
229 user32_time_t msg_stime; /* [XSI] time of last msgsnd() */
230 __int32_t msg_pad1; /* RESERVED: DO NOT USE */
231 user32_time_t msg_rtime; /* [XSI] time of last msgrcv() */
232 __int32_t msg_pad2; /* RESERVED: DO NOT USE */
233 user32_time_t msg_ctime; /* [XSI] time of last msgctl() */
234 __int32_t msg_pad3; /* RESERVED: DO NOT USE */
235 __int32_t msg_pad4[4]; /* RESERVED: DO NOT USE */
236};
237
238#if __DARWIN_ALIGN_NATURAL
239#pragma options align=reset
240#endif
241
242struct label;
243
244/*
245 * Kernel wrapper for the user-level structure
246 */
247struct msqid_kernel {
248 struct user_msqid_ds u;
249 struct label *label; /* MAC framework label */
250};
251
252#endif /* __APPLE_API_PRIVATE */
253#endif /* KERNEL */
254
255
256#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
257#ifdef __APPLE_API_UNSTABLE
258/* XXX kernel only; protect with macro later */
259
260struct msg {
261 struct msg *msg_next; /* next msg in the chain */
262 long msg_type; /* type of this message */
263 /* >0 -> type of this message */
264 /* 0 -> free header */
265 unsigned short msg_ts; /* size of this message */
266 short msg_spot; /* location of msg start in buffer */
267 struct label *label; /* MAC label */
268};
269
270/*
271 * Example structure describing a message whose address is to be passed as
272 * the second argument to the functions msgrcv() and msgsnd(). The only
273 * actual hard requirement is that the first field be of type long, and
274 * contain the message type. The user is encouraged to define their own
275 * application specific structure; this definition is included solely for
276 * backward compatability with existing source code.
277 */
278struct mymsg {
279 long mtype; /* message type (+ve integer) */
280 char mtext[1]; /* message body */
281};
282
283/*
284 * Based on the configuration parameters described in an SVR2 (yes, two)
285 * config(1m) man page.
286 *
287 * Each message is broken up and stored in segments that are msgssz bytes
288 * long. For efficiency reasons, this should be a power of two. Also,
289 * it doesn't make sense if it is less than 8 or greater than about 256.
290 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
291 * two between 8 and 1024 inclusive (and panic's if it isn't).
292 */
293struct msginfo {
294 int msgmax, /* max chars in a message */
295 msgmni, /* max message queue identifiers */
296 msgmnb, /* max chars in a queue */
297 msgtql, /* max messages in system */
298 msgssz, /* size of a message segment (see notes above) */
299 msgseg; /* number of message segments */
300};
301#ifdef KERNEL
302extern struct msginfo msginfo;
303
304#ifndef MSGSSZ
305#define MSGSSZ 8 /* Each segment must be 2^N long */
306#endif
307#ifndef MSGSEG
308#define MSGSEG 2048 /* must be less than 32767 */
309#endif
310#define MSGMAX (MSGSSZ*MSGSEG)
311#ifndef MSGMNB
312#define MSGMNB 2048 /* max # of bytes in a queue */
313#endif
314#ifndef MSGMNI
315#define MSGMNI 40
316#endif
317#ifndef MSGTQL
318#define MSGTQL 40
319#endif
320
321/*
322 * macros to convert between msqid_ds's and msqid's.
323 * (specific to this implementation)
324 */
325#define MSQID(ix, ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000))
326#define MSQID_IX(id) ((id) & 0xffff)
327#define MSQID_SEQ(id) (((id) >> 16) & 0xffff)
328
329/*
330 * The rest of this file is specific to this particular implementation.
331 */
332
333
334/*
335 * Stuff allocated in machdep.h
336 */
337struct msgmap {
338 short next; /* next segment in buffer */
339 /* -1 -> available */
340 /* 0..(MSGSEG-1) -> index of next segment */
341};
342
343/* The following four externs really, really need to die; should be static */
344extern char *msgpool; /* MSGMAX byte long msg buffer pool */
345extern struct msgmap *msgmaps; /* MSGSEG msgmap structures */
346extern struct msg *msghdrs; /* MSGTQL msg headers */
347extern struct msqid_kernel *msqids; /* MSGMNI user_msqid_ds struct's */
348
349#define MSG_LOCKED 01000 /* Is this msqid_ds locked? */
350
351#endif /* KERNEL */
352#endif /* __APPLE_API_UNSTABLE */
353#endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
354
355#ifndef KERNEL
356
357__BEGIN_DECLS
358#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
359int msgsys(int, ...);
360#endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
361int msgctl(int, int, struct msqid_ds *) __DARWIN_ALIAS(msgctl);
362int msgget(key_t, int);
363ssize_t msgrcv(int, void *, size_t, long, int) __DARWIN_ALIAS_C(msgrcv);
364int msgsnd(int, const void *, size_t, int) __DARWIN_ALIAS_C(msgsnd);
365__END_DECLS
366
367#endif /* !KERNEL */
368
369#endif /* !_SYS_MSG_H_ */
370