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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /* $NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $ */
23:
24: /*
25: * SVID compatible msg.h file
26: *
27: * Author: Daniel Boulet
28: *
29: * Copyright 1993 Daniel Boulet and RTMX Inc.
30: *
31: * This system call was implemented by Daniel Boulet under contract from RTMX.
32: *
33: * Redistribution and use in source forms, with and without modification,
34: * are permitted provided that this entire comment appears intact.
35: *
36: * Redistribution in binary form may occur without any restrictions.
37: * Obviously, it would be nice if you gave credit where credit is due
38: * but requiring it would be too onerous.
39: *
40: * This software is provided ``AS IS'' without any warranties of any kind.
41: */
42:
43: #ifndef _SYS_MSG_H_
44: #define _SYS_MSG_H_
45:
46: #include <sys/ipc.h>
47:
48: /*
49: * The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct
50: * are as defined by the SV API Intel 386 Processor Supplement.
51: */
52:
53: #define MSG_NOERROR 010000 /* don't complain about too long msgs */
54:
55: struct msqid_ds {
56: struct ipc_perm msg_perm; /* msg queue permission bits */
57: struct msg *msg_first; /* first message in the queue */
58: struct msg *msg_last; /* last message in the queue */
59: u_long msg_cbytes; /* number of bytes in use on the queue */
60: u_long msg_qnum; /* number of msgs in the queue */
61: u_long msg_qbytes; /* max # of bytes on the queue */
62: pid_t msg_lspid; /* pid of last msgsnd() */
63: pid_t msg_lrpid; /* pid of last msgrcv() */
64: time_t msg_stime; /* time of last msgsnd() */
65: long msg_pad1;
66: time_t msg_rtime; /* time of last msgrcv() */
67: long msg_pad2;
68: time_t msg_ctime; /* time of last msgctl() */
69: long msg_pad3;
70: long msg_pad4[4];
71: };
72:
73: struct msg {
74: struct msg *msg_next; /* next msg in the chain */
75: long msg_type; /* type of this message */
76: /* >0 -> type of this message */
77: /* 0 -> free header */
78: u_short msg_ts; /* size of this message */
79: short msg_spot; /* location of start of msg in buffer */
80: };
81:
82: /*
83: * Structure describing a message. The SVID doesn't suggest any
84: * particular name for this structure. There is a reference in the
85: * msgop man page that reads "The structure mymsg is an example of what
86: * this user defined buffer might look like, and includes the following
87: * members:". This sentence is followed by two lines equivalent
88: * to the mtype and mtext field declarations below. It isn't clear
89: * if "mymsg" refers to the naem of the structure type or the name of an
90: * instance of the structure...
91: */
92: struct mymsg {
93: long mtype; /* message type (+ve integer) */
94: char mtext[1]; /* message body */
95: };
96:
97: /*
98: * Based on the configuration parameters described in an SVR2 (yes, two)
99: * config(1m) man page.
100: *
101: * Each message is broken up and stored in segments that are msgssz bytes
102: * long. For efficiency reasons, this should be a power of two. Also,
103: * it doesn't make sense if it is less than 8 or greater than about 256.
104: * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
105: * two between 8 and 1024 inclusive (and panic's if it isn't).
106: */
107: struct msginfo {
108: int msgmax, /* max chars in a message */
109: msgmni, /* max message queue identifiers */
110: msgmnb, /* max chars in a queue */
111: msgtql, /* max messages in system */
112: msgssz, /* size of a message segment (see notes above) */
113: msgseg; /* number of message segments */
114: };
115: #ifdef KERNEL
116: extern struct msginfo msginfo;
117:
118: #ifndef MSGSSZ
119: #define MSGSSZ 8 /* Each segment must be 2^N long */
120: #endif
121: #ifndef MSGSEG
122: #define MSGSEG 2048 /* must be less than 32767 */
123: #endif
124: #define MSGMAX (MSGSSZ*MSGSEG)
125: #ifndef MSGMNB
126: #define MSGMNB 2048 /* max # of bytes in a queue */
127: #endif
128: #ifndef MSGMNI
129: #define MSGMNI 40
130: #endif
131: #ifndef MSGTQL
132: #define MSGTQL 40
133: #endif
134:
135: /*
136: * macros to convert between msqid_ds's and msqid's.
137: * (specific to this implementation)
138: */
139: #define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000))
140: #define MSQID_IX(id) ((id) & 0xffff)
141: #define MSQID_SEQ(id) (((id) >> 16) & 0xffff)
142:
143: /*
144: * The rest of this file is specific to this particular implementation.
145: */
146:
147:
148: /*
149: * Stuff allocated in machdep.h
150: */
151: struct msgmap {
152: short next; /* next segment in buffer */
153: /* -1 -> available */
154: /* 0..(MSGSEG-1) -> index of next segment */
155: };
156:
157: extern char *msgpool; /* MSGMAX byte long msg buffer pool */
158: extern struct msgmap *msgmaps; /* MSGSEG msgmap structures */
159: extern struct msg *msghdrs; /* MSGTQL msg headers */
160: extern struct msqid_ds *msqids; /* MSGMNI msqid_ds struct's */
161:
162: #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */
163:
164: #endif /* KERNEL */
165:
166: #ifndef KERNEL
167: #include <sys/cdefs.h>
168:
169: __BEGIN_DECLS
170: int msgsys __P((int, ...));
171: int msgctl __P((int, int, struct msqid_ds *));
172: int msgget __P((key_t, int));
173: int msgsnd __P((int, void *, size_t, int));
174: int msgrcv __P((int, void*, size_t, long, int));
175: __END_DECLS
176: #endif /* !KERNEL */
177:
178: #endif /* !_SYS_MSG_H_ */
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