msg.h (8872B) - Raw
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 */ 162 163 164 165 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) 166 #ifdef __APPLE_API_UNSTABLE 167 /* XXX kernel only; protect with macro later */ 168 169 struct msg { 170 struct msg *msg_next; /* next msg in the chain */ 171 long msg_type; /* type of this message */ 172 /* >0 -> type of this message */ 173 /* 0 -> free header */ 174 unsigned short msg_ts; /* size of this message */ 175 short msg_spot; /* location of msg start in buffer */ 176 struct label *label; /* MAC label */ 177 }; 178 179 /* 180 * Example structure describing a message whose address is to be passed as 181 * the second argument to the functions msgrcv() and msgsnd(). The only 182 * actual hard requirement is that the first field be of type long, and 183 * contain the message type. The user is encouraged to define their own 184 * application specific structure; this definition is included solely for 185 * backward compatability with existing source code. 186 */ 187 struct mymsg { 188 long mtype; /* message type (+ve integer) */ 189 char mtext[1]; /* message body */ 190 }; 191 192 /* 193 * Based on the configuration parameters described in an SVR2 (yes, two) 194 * config(1m) man page. 195 * 196 * Each message is broken up and stored in segments that are msgssz bytes 197 * long. For efficiency reasons, this should be a power of two. Also, 198 * it doesn't make sense if it is less than 8 or greater than about 256. 199 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of 200 * two between 8 and 1024 inclusive (and panic's if it isn't). 201 */ 202 struct msginfo { 203 int msgmax, /* max chars in a message */ 204 msgmni, /* max message queue identifiers */ 205 msgmnb, /* max chars in a queue */ 206 msgtql, /* max messages in system */ 207 msgssz, /* size of a message segment (see notes above) */ 208 msgseg; /* number of message segments */ 209 }; 210 #endif /* __APPLE_API_UNSTABLE */ 211 #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */ 212 213 214 __BEGIN_DECLS 215 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) 216 int msgsys(int, ...); 217 #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */ 218 int msgctl(int, int, struct msqid_ds *) __DARWIN_ALIAS(msgctl); 219 int msgget(key_t, int); 220 ssize_t msgrcv(int, void *, size_t, long, int) __DARWIN_ALIAS_C(msgrcv); 221 int msgsnd(int, const void *, size_t, int) __DARWIN_ALIAS_C(msgsnd); 222 __END_DECLS 223 224 225 #endif /* !_SYS_MSG_H_ */