bsd/sys/msg.h

   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 */
  83 typedef unsigned long           msgqnum_t;
  84
  85 /* [XSI] Used for the number of bytes allowed in a message queue */
  86 typedef 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))
 116 struct msqid_ds
 117 #else
 118 #define msqid_ds        __msqid_ds_new
 119 struct __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
 144 struct __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
 171 typedef user_ulong_t    user_msgqnum_t;
 172 typedef user64_ulong_t  user64_msgqnum_t;
 173 typedef user32_ulong_t  user32_msgqnum_t;
 174
 175 typedef user_ulong_t    user_msglen_t;
 176 typedef user64_ulong_t  user64_msglen_t;
 177 typedef user32_ulong_t  user32_msglen_t;
 178
 179 /* kernel version */
 180 struct 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  */
 202 struct 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
 220 struct user32_msqid_ds
 221 {
 222         struct __ipc_perm_new   msg_perm; /* [XSI] msg queue permissions */
 223         __int32_t       msg_first;      /* RESERVED: kernel use only */
 224         __int32_t       msg_last;       /* RESERVED: kernel use only */
 225         user32_msglen_t msg_cbytes;     /* # of bytes on the queue */
 226         user32_msgqnum_t        msg_qnum;       /* [XSI] number of msgs on the queue */
 227         user32_msglen_t msg_qbytes;     /* [XSI] max bytes on the queue */
 228         pid_t           msg_lspid;      /* [XSI] pid of last msgsnd() */
 229         pid_t           msg_lrpid;      /* [XSI] pid of last msgrcv() */
 230         user32_time_t           msg_stime;      /* [XSI] time of last msgsnd() */
 231         __int32_t       msg_pad1;       /* RESERVED: DO NOT USE */
 232         user32_time_t           msg_rtime;      /* [XSI] time of last msgrcv() */
 233         __int32_t       msg_pad2;       /* RESERVED: DO NOT USE */
 234         user32_time_t           msg_ctime;      /* [XSI] time of last msgctl() */
 235         __int32_t       msg_pad3;       /* RESERVED: DO NOT USE */
 236         __int32_t       msg_pad4[4];    /* RESERVED: DO NOT USE */
 237 };
 238
 239 #if __DARWIN_ALIGN_NATURAL
 240 #pragma options align=reset
 241 #endif
 242
 243 struct label;
 244
 245 /*
 246  * Kernel wrapper for the user-level structure
 247  */
 248 struct msqid_kernel {
 249         struct  user_msqid_ds u;
 250         struct  label *label;   /* MAC framework label */
 251 };
 252
 253 #endif  /* __APPLE_API_PRIVATE */
 254 #endif  /* KERNEL */
 255
 256
 257 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 258 #ifdef __APPLE_API_UNSTABLE
 259 /* XXX kernel only; protect with macro later */
 260
 261 struct msg {
 262         struct msg      *msg_next;      /* next msg in the chain */
 263         long            msg_type;       /* type of this message */
 264                                         /* >0 -> type of this message */
 265                                         /* 0 -> free header */
 266         unsigned short  msg_ts;         /* size of this message */
 267         short           msg_spot;       /* location of msg start in buffer */
 268         struct label    *label;         /* MAC label */
 269 };
 270
 271 /*
 272  * Example structure describing a message whose address is to be passed as
 273  * the second argument to the functions msgrcv() and msgsnd().  The only
 274  * actual hard requirement is that the first field be of type long, and
 275  * contain the message type.  The user is encouraged to define their own
 276  * application specific structure; this definition is included solely for
 277  * backward compatability with existing source code.
 278  */
 279 struct mymsg {
 280         long    mtype;          /* message type (+ve integer) */
 281         char    mtext[1];       /* message body */
 282 };
 283
 284 /*
 285  * Based on the configuration parameters described in an SVR2 (yes, two)
 286  * config(1m) man page.
 287  *
 288  * Each message is broken up and stored in segments that are msgssz bytes
 289  * long.  For efficiency reasons, this should be a power of two.  Also,
 290  * it doesn't make sense if it is less than 8 or greater than about 256.
 291  * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
 292  * two between 8 and 1024 inclusive (and panic's if it isn't).
 293  */
 294 struct msginfo {
 295         int     msgmax,         /* max chars in a message */
 296                 msgmni,         /* max message queue identifiers */
 297                 msgmnb,         /* max chars in a queue */
 298                 msgtql,         /* max messages in system */
 299                 msgssz,         /* size of a message segment (see notes above) */
 300                 msgseg;         /* number of message segments */
 301 };
 302 #ifdef KERNEL
 303 extern struct msginfo   msginfo;
 304
 305 #ifndef MSGSSZ
 306 #define MSGSSZ  8               /* Each segment must be 2^N long */
 307 #endif
 308 #ifndef MSGSEG
 309 #define MSGSEG  2048            /* must be less than 32767 */
 310 #endif
 311 #define MSGMAX  (MSGSSZ*MSGSEG)
 312 #ifndef MSGMNB
 313 #define MSGMNB  2048            /* max # of bytes in a queue */
 314 #endif
 315 #ifndef MSGMNI
 316 #define MSGMNI  40
 317 #endif
 318 #ifndef MSGTQL
 319 #define MSGTQL  40
 320 #endif
 321
 322 /*
 323  * macros to convert between msqid_ds's and msqid's.
 324  * (specific to this implementation)
 325  */
 326 #define MSQID(ix,ds)    ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000))
 327 #define MSQID_IX(id)    ((id) & 0xffff)
 328 #define MSQID_SEQ(id)   (((id) >> 16) & 0xffff)
 329
 330 /*
 331  * The rest of this file is specific to this particular implementation.
 332  */
 333
 334
 335 /*
 336  * Stuff allocated in machdep.h
 337  */
 338 struct msgmap {
 339         short   next;           /* next segment in buffer */
 340                                 /* -1 -> available */
 341                                 /* 0..(MSGSEG-1) -> index of next segment */
 342 };
 343
 344 /* The following four externs really, really need to die; should be static */
 345 extern char *msgpool;           /* MSGMAX byte long msg buffer pool */
 346 extern struct msgmap *msgmaps;  /* MSGSEG msgmap structures */
 347 extern struct msg *msghdrs;     /* MSGTQL msg headers */
 348 extern struct msqid_kernel *msqids;     /* MSGMNI user_msqid_ds struct's */
 349
 350 #define MSG_LOCKED      01000   /* Is this msqid_ds locked? */
 351
 352 #endif  /* KERNEL */
 353 #endif  /* __APPLE_API_UNSTABLE */
 354 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 355
 356 #ifndef KERNEL
 357
 358 __BEGIN_DECLS
 359 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 360 int msgsys(int, ...);
 361 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 362 int msgctl(int, int, struct msqid_ds *) __DARWIN_ALIAS(msgctl);
 363 int msgget(key_t, int);
 364 ssize_t msgrcv(int, void *, size_t, long, int) __DARWIN_ALIAS_C(msgrcv);
 365 int msgsnd(int, const void *, size_t, int) __DARWIN_ALIAS_C(msgsnd);
 366 __END_DECLS
 367
 368 #endif /* !KERNEL */
 369
 370 #endif /* !_SYS_MSG_H_ */
 371
 372