Change sendfile() to use the new m_ext callback scheme for cleaning up after
[dragonfly.git] / sys / sys / msg.h
CommitLineData
984263bc 1/* $FreeBSD: src/sys/sys/msg.h,v 1.10.2.1 2000/08/04 22:31:10 peter Exp $ */
ec12abe0 2/* $DragonFly: src/sys/sys/msg.h,v 1.4 2003/08/27 02:03:22 dillon Exp $ */
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3/* $NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $ */
4
5/*
6 * SVID compatible msg.h file
7 *
8 * Author: Daniel Boulet
9 *
10 * Copyright 1993 Daniel Boulet and RTMX Inc.
11 *
12 * This system call was implemented by Daniel Boulet under contract from RTMX.
13 *
14 * Redistribution and use in source forms, with and without modification,
15 * are permitted provided that this entire comment appears intact.
16 *
17 * Redistribution in binary form may occur without any restrictions.
18 * Obviously, it would be nice if you gave credit where credit is due
19 * but requiring it would be too onerous.
20 *
21 * This software is provided ``AS IS'' without any warranties of any kind.
22 */
23
24#ifndef _SYS_MSG_H_
25#define _SYS_MSG_H_
26
27#include <sys/ipc.h>
28
29/*
30 * The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct
31 * are as defined by the SV API Intel 386 Processor Supplement.
32 */
33
34#define MSG_NOERROR 010000 /* don't complain about too long msgs */
35
36struct msg;
37
38struct msqid_ds {
39 struct ipc_perm msg_perm; /* msg queue permission bits */
40 struct msg *msg_first; /* first message in the queue */
41 struct msg *msg_last; /* last message in the queue */
42 u_long msg_cbytes; /* number of bytes in use on the queue */
43 u_long msg_qnum; /* number of msgs in the queue */
44 u_long msg_qbytes; /* max # of bytes on the queue */
45 pid_t msg_lspid; /* pid of last msgsnd() */
46 pid_t msg_lrpid; /* pid of last msgrcv() */
47 time_t msg_stime; /* time of last msgsnd() */
48 long msg_pad1;
49 time_t msg_rtime; /* time of last msgrcv() */
50 long msg_pad2;
51 time_t msg_ctime; /* time of last msgctl() */
52 long msg_pad3;
53 long msg_pad4[4];
54};
55
56/*
57 * Structure describing a message. The SVID doesn't suggest any
58 * particular name for this structure. There is a reference in the
59 * msgop man page that reads "The structure mymsg is an example of what
60 * this user defined buffer might look like, and includes the following
61 * members:". This sentence is followed by two lines equivalent
62 * to the mtype and mtext field declarations below. It isn't clear
63 * if "mymsg" refers to the naem of the structure type or the name of an
64 * instance of the structure...
65 */
66struct mymsg {
67 long mtype; /* message type (+ve integer) */
68 char mtext[1]; /* message body */
69};
70
ec12abe0 71#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
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72
73/*
74 * Based on the configuration parameters described in an SVR2 (yes, two)
75 * config(1m) man page.
76 *
77 * Each message is broken up and stored in segments that are msgssz bytes
78 * long. For efficiency reasons, this should be a power of two. Also,
79 * it doesn't make sense if it is less than 8 or greater than about 256.
80 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
81 * two between 8 and 1024 inclusive (and panic's if it isn't).
82 */
83struct msginfo {
84 int msgmax, /* max chars in a message */
85 msgmni, /* max message queue identifiers */
86 msgmnb, /* max chars in a queue */
87 msgtql, /* max messages in system */
88 msgssz, /* size of a message segment (see notes above) */
89 msgseg; /* number of message segments */
90};
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91#endif
92
93#ifdef _KERNEL
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94extern struct msginfo msginfo;
95#endif
96
97#ifndef _KERNEL
98
99#include <sys/cdefs.h>
100
101__BEGIN_DECLS
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102int msgsys (int, ...);
103int msgctl (int, int, struct msqid_ds *);
104int msgget (key_t, int);
105int msgsnd (int, void *, size_t, int);
106int msgrcv (int, void*, size_t, long, int);
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107__END_DECLS
108#endif
109
110#endif /* !_SYS_MSG_H_ */