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1/* $FreeBSD: head/sys/sys/msg.h 55205 1999-12-29 04:46:21Z peter $ */
1/* $FreeBSD: head/sys/sys/msg.h 59839 2000-05-01 13:33:56Z peter $ */
2/* $NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $ */
3
4/*
5 * SVID compatible msg.h file
6 *
7 * Author: Daniel Boulet
8 *
9 * Copyright 1993 Daniel Boulet and RTMX Inc.

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27
28/*
29 * The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct
30 * are as defined by the SV API Intel 386 Processor Supplement.
31 */
32
33#define MSG_NOERROR 010000 /* don't complain about too long msgs */
34
2/* $NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $ */
3
4/*
5 * SVID compatible msg.h file
6 *
7 * Author: Daniel Boulet
8 *
9 * Copyright 1993 Daniel Boulet and RTMX Inc.

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27
28/*
29 * The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct
30 * are as defined by the SV API Intel 386 Processor Supplement.
31 */
32
33#define MSG_NOERROR 010000 /* don't complain about too long msgs */
34
35struct msg;
36
35struct msqid_ds {
36 struct ipc_perm msg_perm; /* msg queue permission bits */
37 struct msg *msg_first; /* first message in the queue */
38 struct msg *msg_last; /* last message in the queue */
39 u_long msg_cbytes; /* number of bytes in use on the queue */
40 u_long msg_qnum; /* number of msgs in the queue */
41 u_long msg_qbytes; /* max # of bytes on the queue */
42 pid_t msg_lspid; /* pid of last msgsnd() */
43 pid_t msg_lrpid; /* pid of last msgrcv() */
44 time_t msg_stime; /* time of last msgsnd() */
45 long msg_pad1;
46 time_t msg_rtime; /* time of last msgrcv() */
47 long msg_pad2;
48 time_t msg_ctime; /* time of last msgctl() */
49 long msg_pad3;
50 long msg_pad4[4];
51};
52
37struct msqid_ds {
38 struct ipc_perm msg_perm; /* msg queue permission bits */
39 struct msg *msg_first; /* first message in the queue */
40 struct msg *msg_last; /* last message in the queue */
41 u_long msg_cbytes; /* number of bytes in use on the queue */
42 u_long msg_qnum; /* number of msgs in the queue */
43 u_long msg_qbytes; /* max # of bytes on the queue */
44 pid_t msg_lspid; /* pid of last msgsnd() */
45 pid_t msg_lrpid; /* pid of last msgrcv() */
46 time_t msg_stime; /* time of last msgsnd() */
47 long msg_pad1;
48 time_t msg_rtime; /* time of last msgrcv() */
49 long msg_pad2;
50 time_t msg_ctime; /* time of last msgctl() */
51 long msg_pad3;
52 long msg_pad4[4];
53};
54
53struct msg {
54 struct msg *msg_next; /* next msg in the chain */
55 long msg_type; /* type of this message */
56 /* >0 -> type of this message */
57 /* 0 -> free header */
58 u_short msg_ts; /* size of this message */
59 short msg_spot; /* location of start of msg in buffer */
60};
61
62/*
63 * Structure describing a message. The SVID doesn't suggest any
64 * particular name for this structure. There is a reference in the
65 * msgop man page that reads "The structure mymsg is an example of what
66 * this user defined buffer might look like, and includes the following
67 * members:". This sentence is followed by two lines equivalent
68 * to the mtype and mtext field declarations below. It isn't clear
69 * if "mymsg" refers to the naem of the structure type or the name of an
70 * instance of the structure...
71 */
72struct mymsg {
73 long mtype; /* message type (+ve integer) */
74 char mtext[1]; /* message body */
75};
76
55/*
56 * Structure describing a message. The SVID doesn't suggest any
57 * particular name for this structure. There is a reference in the
58 * msgop man page that reads "The structure mymsg is an example of what
59 * this user defined buffer might look like, and includes the following
60 * members:". This sentence is followed by two lines equivalent
61 * to the mtype and mtext field declarations below. It isn't clear
62 * if "mymsg" refers to the naem of the structure type or the name of an
63 * instance of the structure...
64 */
65struct mymsg {
66 long mtype; /* message type (+ve integer) */
67 char mtext[1]; /* message body */
68};
69
70#ifdef _KERNEL
71
77/*
78 * Based on the configuration parameters described in an SVR2 (yes, two)
79 * config(1m) man page.
80 *
81 * Each message is broken up and stored in segments that are msgssz bytes
82 * long. For efficiency reasons, this should be a power of two. Also,
83 * it doesn't make sense if it is less than 8 or greater than about 256.
84 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
85 * two between 8 and 1024 inclusive (and panic's if it isn't).
86 */
87struct msginfo {
88 int msgmax, /* max chars in a message */
89 msgmni, /* max message queue identifiers */
90 msgmnb, /* max chars in a queue */
91 msgtql, /* max messages in system */
92 msgssz, /* size of a message segment (see notes above) */
93 msgseg; /* number of message segments */
94};
72/*
73 * Based on the configuration parameters described in an SVR2 (yes, two)
74 * config(1m) man page.
75 *
76 * Each message is broken up and stored in segments that are msgssz bytes
77 * long. For efficiency reasons, this should be a power of two. Also,
78 * it doesn't make sense if it is less than 8 or greater than about 256.
79 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
80 * two between 8 and 1024 inclusive (and panic's if it isn't).
81 */
82struct msginfo {
83 int msgmax, /* max chars in a message */
84 msgmni, /* max message queue identifiers */
85 msgmnb, /* max chars in a queue */
86 msgtql, /* max messages in system */
87 msgssz, /* size of a message segment (see notes above) */
88 msgseg; /* number of message segments */
89};
95#ifdef _KERNEL
96extern struct msginfo msginfo;
90extern struct msginfo msginfo;
97
98#ifndef MSGSSZ
99#define MSGSSZ 8 /* Each segment must be 2^N long */
100#endif
91#endif
101#ifndef MSGSEG
102#define MSGSEG 2048 /* must be less than 32767 */
103#endif
104#define MSGMAX (MSGSSZ*MSGSEG)
105#ifndef MSGMNB
106#define MSGMNB 2048 /* max # of bytes in a queue */
107#endif
108#ifndef MSGMNI
109#define MSGMNI 40
110#endif
111#ifndef MSGTQL
112#define MSGTQL 40
113#endif
114
92
115/*
116 * macros to convert between msqid_ds's and msqid's.
117 * (specific to this implementation)
118 */
119#define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000))
120#define MSQID_IX(id) ((id) & 0xffff)
121#define MSQID_SEQ(id) (((id) >> 16) & 0xffff)
122
123/*
124 * The rest of this file is specific to this particular implementation.
125 */
126
127
128/*
129 * Stuff allocated in machdep.h
130 */
131struct msgmap {
132 short next; /* next segment in buffer */
133 /* -1 -> available */
134 /* 0..(MSGSEG-1) -> index of next segment */
135};
136
137extern char *msgpool; /* MSGMAX byte long msg buffer pool */
138extern struct msgmap *msgmaps; /* MSGSEG msgmap structures */
139extern struct msg *msghdrs; /* MSGTQL msg headers */
140extern struct msqid_ds *msqids; /* MSGMNI msqid_ds struct's */
141
142#define MSG_LOCKED 01000 /* Is this msqid_ds locked? */
143
144#endif /* _KERNEL */
145
146#ifndef _KERNEL
93#ifndef _KERNEL
94
147#include <sys/cdefs.h>
148
149__BEGIN_DECLS
150int msgsys __P((int, ...));
151int msgctl __P((int, int, struct msqid_ds *));
152int msgget __P((key_t, int));
153int msgsnd __P((int, void *, size_t, int));
154int msgrcv __P((int, void*, size_t, long, int));
155__END_DECLS
156#endif
157
158#endif /* !_SYS_MSG_H_ */
95#include <sys/cdefs.h>
96
97__BEGIN_DECLS
98int msgsys __P((int, ...));
99int msgctl __P((int, int, struct msqid_ds *));
100int msgget __P((key_t, int));
101int msgsnd __P((int, void *, size_t, int));
102int msgrcv __P((int, void*, size_t, long, int));
103__END_DECLS
104#endif
105
106#endif /* !_SYS_MSG_H_ */