1 /* $FreeBSD: src/sys/sys/msg.h,v 1.10.2.1 2000/08/04 22:31:10 peter Exp $ */
2 /* $DragonFly: src/sys/sys/msg.h,v 1.4 2003/08/27 02:03:22 dillon Exp $ */
3 /* $NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $ */
6 * SVID compatible msg.h file
8 * Author: Daniel Boulet
10 * Copyright 1993 Daniel Boulet and RTMX Inc.
12 * This system call was implemented by Daniel Boulet under contract from RTMX.
14 * Redistribution and use in source forms, with and without modification,
15 * are permitted provided that this entire comment appears intact.
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.
21 * This software is provided ``AS IS'' without any warranties of any kind.
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.
34 #define MSG_NOERROR 010000 /* don't complain about too long msgs */
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() */
49 time_t msg_rtime; /* time of last msgrcv() */
51 time_t msg_ctime; /* time of last msgctl() */
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...
67 long mtype; /* message type (+ve integer) */
68 char mtext[1]; /* message body */
71 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
74 * Based on the configuration parameters described in an SVR2 (yes, two)
75 * config(1m) man page.
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).
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 */
94 extern struct msginfo msginfo;
99 #include <sys/cdefs.h>
102 int msgsys (int, ...);
103 int msgctl (int, int, struct msqid_ds *);
104 int msgget (key_t, int);
105 int msgsnd (int, void *, size_t, int);
106 int msgrcv (int, void*, size_t, long, int);
110 #endif /* !_SYS_MSG_H_ */