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107 lines
3.3 KiB
C
107 lines
3.3 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $ */
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/*
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* SVID compatible msg.h file
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*
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* Author: Daniel Boulet
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*
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* Copyright 1993 Daniel Boulet and RTMX Inc.
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*
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* This system call was implemented by Daniel Boulet under contract from RTMX.
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*
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* Redistribution and use in source forms, with and without modification,
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* are permitted provided that this entire comment appears intact.
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*
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* Redistribution in binary form may occur without any restrictions.
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* Obviously, it would be nice if you gave credit where credit is due
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* but requiring it would be too onerous.
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*
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* This software is provided ``AS IS'' without any warranties of any kind.
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*/
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#ifndef _SYS_MSG_H_
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#define _SYS_MSG_H_
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#include <sys/ipc.h>
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/*
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* The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct
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* are as defined by the SV API Intel 386 Processor Supplement.
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*/
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#define MSG_NOERROR 010000 /* don't complain about too long msgs */
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struct msg;
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struct msqid_ds {
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struct ipc_perm msg_perm; /* msg queue permission bits */
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struct msg *msg_first; /* first message in the queue */
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struct msg *msg_last; /* last message in the queue */
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u_long msg_cbytes; /* number of bytes in use on the queue */
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u_long msg_qnum; /* number of msgs in the queue */
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u_long msg_qbytes; /* max # of bytes on the queue */
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pid_t msg_lspid; /* pid of last msgsnd() */
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pid_t msg_lrpid; /* pid of last msgrcv() */
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time_t msg_stime; /* time of last msgsnd() */
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long msg_pad1;
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time_t msg_rtime; /* time of last msgrcv() */
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long msg_pad2;
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time_t msg_ctime; /* time of last msgctl() */
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long msg_pad3;
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long msg_pad4[4];
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};
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/*
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* Structure describing a message. The SVID doesn't suggest any
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* particular name for this structure. There is a reference in the
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* msgop man page that reads "The structure mymsg is an example of what
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* this user defined buffer might look like, and includes the following
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* members:". This sentence is followed by two lines equivalent
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* to the mtype and mtext field declarations below. It isn't clear
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* if "mymsg" refers to the naem of the structure type or the name of an
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* instance of the structure...
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*/
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struct mymsg {
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long mtype; /* message type (+ve integer) */
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char mtext[1]; /* message body */
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};
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#ifdef _KERNEL
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/*
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* Based on the configuration parameters described in an SVR2 (yes, two)
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* config(1m) man page.
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*
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* Each message is broken up and stored in segments that are msgssz bytes
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* long. For efficiency reasons, this should be a power of two. Also,
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* it doesn't make sense if it is less than 8 or greater than about 256.
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* Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
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* two between 8 and 1024 inclusive (and panic's if it isn't).
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*/
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struct msginfo {
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int msgmax, /* max chars in a message */
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msgmni, /* max message queue identifiers */
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msgmnb, /* max chars in a queue */
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msgtql, /* max messages in system */
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msgssz, /* size of a message segment (see notes above) */
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msgseg; /* number of message segments */
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};
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extern struct msginfo msginfo;
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#endif
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#ifndef _KERNEL
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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int msgsys(int, ...);
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int msgctl(int, int, struct msqid_ds *);
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int msgget(key_t, int);
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int msgsnd(int, void *, size_t, int);
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int msgrcv(int, void*, size_t, long, int);
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__END_DECLS
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#endif
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#endif /* !_SYS_MSG_H_ */
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