[apple/xnu.git] / bsd / sys / msg.h

/*
 * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*	$NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $	*/

/*
 * SVID compatible msg.h file
 *
 * Author:  Daniel Boulet
 *
 * Copyright 1993 Daniel Boulet and RTMX Inc.
 *
 * This system call was implemented by Daniel Boulet under contract from RTMX.
 *
 * Redistribution and use in source forms, with and without modification,
 * are permitted provided that this entire comment appears intact.
 *
 * Redistribution in binary form may occur without any restrictions.
 * Obviously, it would be nice if you gave credit where credit is due
 * but requiring it would be too onerous.
 *
 * This software is provided ``AS IS'' without any warranties of any kind.
 */

#ifndef _SYS_MSG_H_
#define _SYS_MSG_H_

#include <sys/appleapiopts.h>

#include <sys/_types.h>
#include <sys/cdefs.h>

/*
 * [XSI] All of the symbols from <sys/ipc.h> SHALL be defined when this
 * header is included
 */
#include <sys/ipc.h>


/*
 * [XSI] The pid_t, time_t, key_t, size_t, and ssize_t types shall be
 * defined as described in <sys/types.h>.
 *
 * NOTE:	The definition of the key_t type is implicit from the
 *		inclusion of <sys/ipc.h>
 */
#ifndef _PID_T
typedef __darwin_pid_t		pid_t;
#define _PID_T
#endif

#ifndef	_TIME_T
#define	_TIME_T
typedef	__darwin_time_t		time_t;
#endif

#ifndef _SIZE_T
#define _SIZE_T
typedef __darwin_size_t		size_t;
#endif

#ifndef	_SSIZE_T
#define	_SSIZE_T
typedef	__darwin_ssize_t	ssize_t;
#endif

/* [XSI] Used for the number of messages in the message queue */
typedef unsigned long		msgqnum_t;

/* [XSI] Used for the number of bytes allowed in a message queue */
typedef unsigned long		msglen_t;


/*
 * Possible values for the fifth parameter to msgrcv(), in addition to the
 * IPC_NOWAIT flag, which is permitted.
 */
#define MSG_NOERROR	010000		/* [XSI] No error if big message */


/*
 * Technically, we should force all code references to the new structure
 * definition, not in just the standards conformance case, and leave the
 * legacy interface there for binary compatibility only.  Currently, we
 * are only forcing this for programs requesting standards conformance.
 */
#if defined(__POSIX_C_SOURCE) || defined(kernel) || defined(__LP64__)
/*
 * Structure used internally.
 * 
 * Structure whose address is passed as the third parameter to msgctl()
 * when the second parameter is IPC_SET or IPC_STAT.  In the case of the
 * IPC_SET command, only the msg_perm.{uid|gid|perm} and msg_qbytes are
 * honored.  In the case of IPC_STAT, only the fields indicated as [XSI]
 * mandated fields are guaranteed to meaningful: DO NOT depend on the
 * contents of the other fields.
 *
 * NOTES:	Reserved fields are not preserved across IPC_SET/IPC_STAT.
 */
struct __msqid_ds_new {
	struct __ipc_perm_new	msg_perm; /* [XSI] msg queue permissions */
	__int32_t	msg_first;	/* RESERVED: kernel use only */
	__int32_t	msg_last;	/* RESERVED: kernel use only */
	msglen_t	msg_cbytes;	/* # of bytes on the queue */
	msgqnum_t	msg_qnum;	/* [XSI] number of msgs on the queue */
	msglen_t	msg_qbytes;	/* [XSI] max bytes on the queue */
	pid_t		msg_lspid;	/* [XSI] pid of last msgsnd() */
	pid_t		msg_lrpid;	/* [XSI] pid of last msgrcv() */
	time_t		msg_stime;	/* [XSI] time of last msgsnd() */
	__int32_t	msg_pad1;	/* RESERVED: DO NOT USE */
	time_t		msg_rtime;	/* [XSI] time of last msgrcv() */
	__int32_t	msg_pad2;	/* RESERVED: DO NOT USE */
	time_t		msg_ctime;	/* [XSI] time of last msgctl() */
	__int32_t	msg_pad3;	/* RESERVED: DO NOT USE */
	__int32_t	msg_pad4[4];	/* RESERVED: DO NOT USE */
};
#define	msqid_ds	__msqid_ds_new
#else	/* !_POSIX_C_SOURCE */
#define	msqid_ds	__msqid_ds_old
#endif	/* !_POSIX_C_SOURCE */

#if !defined(__POSIX_C_SOURCE) && !defined(__LP64__)
struct __msqid_ds_old {
	struct __ipc_perm_old	msg_perm; /* [XSI] msg queue permissions */
	__int32_t	msg_first;	/* RESERVED: kernel use only */
	__int32_t	msg_last;	/* RESERVED: kernel use only */
	msglen_t	msg_cbytes;	/* # of bytes on the queue */
	msgqnum_t	msg_qnum;	/* [XSI] number of msgs on the queue */
	msglen_t	msg_qbytes;	/* [XSI] max bytes on the queue */
	pid_t		msg_lspid;	/* [XSI] pid of last msgsnd() */
	pid_t		msg_lrpid;	/* [XSI] pid of last msgrcv() */
	time_t		msg_stime;	/* [XSI] time of last msgsnd() */
	__int32_t	msg_pad1;	/* RESERVED: DO NOT USE */
	time_t		msg_rtime;	/* [XSI] time of last msgrcv() */
	__int32_t	msg_pad2;	/* RESERVED: DO NOT USE */
	time_t		msg_ctime;	/* [XSI] time of last msgctl() */
	__int32_t	msg_pad3;	/* RESERVED: DO NOT USE */
	__int32_t	msg_pad4[4];	/* RESERVED: DO NOT USE */
};
#endif	/* !_POSIX_C_SOURCE */

#ifdef KERNEL
#ifdef __APPLE_API_PRIVATE
#include <machine/types.h>

// LP64todo - should this move?

#if __DARWIN_ALIGN_NATURAL
#pragma options align=natural
#endif

struct user_msqid_ds {
	struct ipc_perm	msg_perm;	/* [XSI] msg queue permissions */
	struct msg	*msg_first;	/* first message in the queue */
	struct msg	*msg_last;	/* last message in the queue */
	msglen_t	msg_cbytes;	/* # of bytes on the queue */
	msgqnum_t	msg_qnum;	/* [XSI] number of msgs on the queue */
	msglen_t	msg_qbytes;	/* [XSI] max bytes on the queue */
	pid_t		msg_lspid;	/* [XSI] pid of last msgsnd() */
	pid_t		msg_lrpid;	/* [XSI] pid of last msgrcv() */
	user_time_t	msg_stime;	/* [XSI] time of last msgsnd() */
	__int32_t	msg_pad1;	/* RESERVED: DO NOT USE */
	user_time_t	msg_rtime;	/* [XSI] time of last msgrcv() */
	__int32_t	msg_pad2;	/* RESERVED: DO NOT USE */
	user_time_t	msg_ctime;	/* [XSI] time of last msgctl() */
	__int32_t	msg_pad3;	/* RESERVED: DO NOT USE */
	__int32_t	msg_pad4[4];
};

#if __DARWIN_ALIGN_NATURAL
#pragma options align=reset
#endif

#endif	/* __APPLE_API_PRIVATE */
#endif	/* KERNEL */


#ifndef _POSIX_C_SOURCE
#ifdef __APPLE_API_UNSTABLE
/* XXX kernel only; protect with macro later */

struct msg {
	struct msg	*msg_next;	/* next msg in the chain */
	long		msg_type;	/* type of this message */
    					/* >0 -> type of this message */
    					/* 0 -> free header */
	unsigned short	msg_ts;		/* size of this message */
	short		msg_spot;	/* location of msg start in buffer */
};

/*
 * Example structure describing a message whose address is to be passed as
 * the second argument to the functions msgrcv() and msgsnd().  The only
 * actual hard requirement is that the first field be of type long, and
 * contain the message type.  The user is encouraged to define their own
 * application specific structure; this definition is included solely for
 * backward compatability with existing source code.
 */
struct mymsg {
	long	mtype;		/* message type (+ve integer) */
	char	mtext[1];	/* message body */
};

/*
 * Based on the configuration parameters described in an SVR2 (yes, two)
 * config(1m) man page.
 *
 * Each message is broken up and stored in segments that are msgssz bytes
 * long.  For efficiency reasons, this should be a power of two.  Also,
 * it doesn't make sense if it is less than 8 or greater than about 256.
 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
 * two between 8 and 1024 inclusive (and panic's if it isn't).
 */
struct msginfo {
	int	msgmax,		/* max chars in a message */
		msgmni,		/* max message queue identifiers */
		msgmnb,		/* max chars in a queue */
		msgtql,		/* max messages in system */
		msgssz,		/* size of a message segment (see notes above) */
		msgseg;		/* number of message segments */
};
#ifdef KERNEL
extern struct msginfo	msginfo;

#ifndef MSGSSZ
#define MSGSSZ	8		/* Each segment must be 2^N long */
#endif
#ifndef MSGSEG
#define MSGSEG	2048		/* must be less than 32767 */
#endif
#define MSGMAX	(MSGSSZ*MSGSEG)
#ifndef MSGMNB
#define MSGMNB	2048		/* max # of bytes in a queue */
#endif
#ifndef MSGMNI
#define MSGMNI	40
#endif
#ifndef MSGTQL
#define MSGTQL	40
#endif

/*
 * macros to convert between msqid_ds's and msqid's.
 * (specific to this implementation)
 */
#define MSQID(ix,ds)	((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000))
#define MSQID_IX(id)	((id) & 0xffff)
#define MSQID_SEQ(id)	(((id) >> 16) & 0xffff)

/*
 * The rest of this file is specific to this particular implementation.
 */


/*
 * Stuff allocated in machdep.h
 */
struct msgmap {
	short	next;		/* next segment in buffer */
    				/* -1 -> available */
    				/* 0..(MSGSEG-1) -> index of next segment */
};

/* The following four externs really, really need to die; should be static */
extern char *msgpool;		/* MSGMAX byte long msg buffer pool */
extern struct msgmap *msgmaps;	/* MSGSEG msgmap structures */
extern struct msg *msghdrs;	/* MSGTQL msg headers */
extern struct user_msqid_ds	*msqids; /* MSGMNI user_msqid_ds struct's */

#define MSG_LOCKED	01000	/* Is this msqid_ds locked? */

#endif	/* KERNEL */
#endif	/* __APPLE_API_UNSTABLE */
#endif	/* !_POSIX_C_SOURCE */

#ifndef KERNEL

__BEGIN_DECLS
#ifndef _POSIX_C_SOURCE
int msgsys(int, ...);
#endif	/* !_POSIX_C_SOURCE */
int msgctl(int, int, struct msqid_ds *) __DARWIN_ALIAS(msgctl);
int msgget(key_t, int);
ssize_t msgrcv(int, void *, size_t, long, int);
int msgsnd(int, const void *, size_t, int);
__END_DECLS

#endif /* !KERNEL */

#endif /* !_SYS_MSG_H_ */
Commit	Line	Data
1c79356b	1	/*
91447636	2	* Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
1c79356b A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
e5568f75 A	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.
1c79356b	11	*
e5568f75 A	12	* This Original Code and all software distributed under the License are
e5568f75 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
e5568f75 A	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.
1c79356b A	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
9bccf70c A	46	#include <sys/appleapiopts.h>
9bccf70c A	47
91447636 A	48	#include <sys/_types.h>
	49	#include <sys/cdefs.h>
	50
	51	/*
	52	* [XSI] All of the symbols from <sys/ipc.h> SHALL be defined when this
	53	* header is included
	54	*/
1c79356b A	55	#include <sys/ipc.h>
1c79356b A	56
9bccf70c	57
1c79356b	58	/*
91447636 A	59	* [XSI] The pid_t, time_t, key_t, size_t, and ssize_t types shall be
	60	* defined as described in <sys/types.h>.
	61	*
	62	* NOTE: The definition of the key_t type is implicit from the
	63	* inclusion of <sys/ipc.h>
	64	*/
	65	#ifndef _PID_T
	66	typedef __darwin_pid_t pid_t;
	67	#define _PID_T
	68	#endif
	69
	70	#ifndef _TIME_T
	71	#define _TIME_T
	72	typedef __darwin_time_t time_t;
	73	#endif
	74
	75	#ifndef _SIZE_T
	76	#define _SIZE_T
	77	typedef __darwin_size_t size_t;
	78	#endif
	79
	80	#ifndef _SSIZE_T
	81	#define _SSIZE_T
	82	typedef __darwin_ssize_t ssize_t;
	83	#endif
	84
	85	/* [XSI] Used for the number of messages in the message queue */
	86	typedef unsigned long msgqnum_t;
	87
	88	/* [XSI] Used for the number of bytes allowed in a message queue */
	89	typedef unsigned long msglen_t;
	90
	91
	92	/*
	93	* Possible values for the fifth parameter to msgrcv(), in addition to the
	94	* IPC_NOWAIT flag, which is permitted.
1c79356b	95	*/
91447636 A	96	#define MSG_NOERROR 010000 /* [XSI] No error if big message */
91447636 A	97
1c79356b	98
91447636 A	99	/*
	100	* Technically, we should force all code references to the new structure
	101	* definition, not in just the standards conformance case, and leave the
	102	* legacy interface there for binary compatibility only. Currently, we
	103	* are only forcing this for programs requesting standards conformance.
	104	*/
	105	#if defined(__POSIX_C_SOURCE) \|\| defined(kernel) \|\| defined(__LP64__)
	106	/*
	107	* Structure used internally.
	108	*
	109	* Structure whose address is passed as the third parameter to msgctl()
	110	* when the second parameter is IPC_SET or IPC_STAT. In the case of the
	111	* IPC_SET command, only the msg_perm.{uid\|gid\|perm} and msg_qbytes are
	112	* honored. In the case of IPC_STAT, only the fields indicated as [XSI]
	113	* mandated fields are guaranteed to meaningful: DO NOT depend on the
	114	* contents of the other fields.
	115	*
	116	* NOTES: Reserved fields are not preserved across IPC_SET/IPC_STAT.
	117	*/
	118	struct __msqid_ds_new {
	119	struct __ipc_perm_new msg_perm; /* [XSI] msg queue permissions */
	120	__int32_t msg_first; /* RESERVED: kernel use only */
	121	__int32_t msg_last; /* RESERVED: kernel use only */
	122	msglen_t msg_cbytes; /* # of bytes on the queue */
	123	msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */
	124	msglen_t msg_qbytes; /* [XSI] max bytes on the queue */
	125	pid_t msg_lspid; /* [XSI] pid of last msgsnd() */
	126	pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */
	127	time_t msg_stime; /* [XSI] time of last msgsnd() */
	128	__int32_t msg_pad1; /* RESERVED: DO NOT USE */
	129	time_t msg_rtime; /* [XSI] time of last msgrcv() */
	130	__int32_t msg_pad2; /* RESERVED: DO NOT USE */
	131	time_t msg_ctime; /* [XSI] time of last msgctl() */
	132	__int32_t msg_pad3; /* RESERVED: DO NOT USE */
	133	__int32_t msg_pad4[4]; /* RESERVED: DO NOT USE */
	134	};
	135	#define msqid_ds __msqid_ds_new
	136	#else /* !_POSIX_C_SOURCE */
	137	#define msqid_ds __msqid_ds_old
	138	#endif /* !_POSIX_C_SOURCE */
	139
	140	#if !defined(__POSIX_C_SOURCE) && !defined(__LP64__)
	141	struct __msqid_ds_old {
	142	struct __ipc_perm_old msg_perm; /* [XSI] msg queue permissions */
	143	__int32_t msg_first; /* RESERVED: kernel use only */
	144	__int32_t msg_last; /* RESERVED: kernel use only */
	145	msglen_t msg_cbytes; /* # of bytes on the queue */
	146	msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */
	147	msglen_t msg_qbytes; /* [XSI] max bytes on the queue */
	148	pid_t msg_lspid; /* [XSI] pid of last msgsnd() */
	149	pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */
	150	time_t msg_stime; /* [XSI] time of last msgsnd() */
	151	__int32_t msg_pad1; /* RESERVED: DO NOT USE */
	152	time_t msg_rtime; /* [XSI] time of last msgrcv() */
	153	__int32_t msg_pad2; /* RESERVED: DO NOT USE */
	154	time_t msg_ctime; /* [XSI] time of last msgctl() */
	155	__int32_t msg_pad3; /* RESERVED: DO NOT USE */
	156	__int32_t msg_pad4[4]; /* RESERVED: DO NOT USE */
1c79356b	157	};
91447636 A	158	#endif /* !_POSIX_C_SOURCE */
	159
	160	#ifdef KERNEL
	161	#ifdef __APPLE_API_PRIVATE
	162	#include <machine/types.h>
	163
	164	// LP64todo - should this move?
	165
	166	#if __DARWIN_ALIGN_NATURAL
	167	#pragma options align=natural
	168	#endif
	169
	170	struct user_msqid_ds {
	171	struct ipc_perm msg_perm; /* [XSI] msg queue permissions */
	172	struct msg msg_first; / first message in the queue */
	173	struct msg msg_last; / last message in the queue */
	174	msglen_t msg_cbytes; /* # of bytes on the queue */
	175	msgqnum_t msg_qnum; /* [XSI] number of msgs on the queue */
	176	msglen_t msg_qbytes; /* [XSI] max bytes on the queue */
	177	pid_t msg_lspid; /* [XSI] pid of last msgsnd() */
	178	pid_t msg_lrpid; /* [XSI] pid of last msgrcv() */
	179	user_time_t msg_stime; /* [XSI] time of last msgsnd() */
	180	__int32_t msg_pad1; /* RESERVED: DO NOT USE */
	181	user_time_t msg_rtime; /* [XSI] time of last msgrcv() */
	182	__int32_t msg_pad2; /* RESERVED: DO NOT USE */
	183	user_time_t msg_ctime; /* [XSI] time of last msgctl() */
	184	__int32_t msg_pad3; /* RESERVED: DO NOT USE */
	185	__int32_t msg_pad4[4];
	186	};
	187
	188	#if __DARWIN_ALIGN_NATURAL
	189	#pragma options align=reset
	190	#endif
	191
	192	#endif /* __APPLE_API_PRIVATE */
	193	#endif /* KERNEL */
	194
	195
	196	#ifndef _POSIX_C_SOURCE
	197	#ifdef __APPLE_API_UNSTABLE
	198	/* XXX kernel only; protect with macro later */
1c79356b A	199
1c79356b A	200	struct msg {
91447636 A	201	struct msg msg_next; / next msg in the chain */
	202	long msg_type; /* type of this message */
	203	/* >0 -> type of this message */
	204	/* 0 -> free header */
	205	unsigned short msg_ts; /* size of this message */
	206	short msg_spot; /* location of msg start in buffer */
1c79356b A	207	};
	208
	209	/*
91447636 A	210	* Example structure describing a message whose address is to be passed as
	211	* the second argument to the functions msgrcv() and msgsnd(). The only
	212	* actual hard requirement is that the first field be of type long, and
	213	* contain the message type. The user is encouraged to define their own
	214	* application specific structure; this definition is included solely for
	215	* backward compatability with existing source code.
1c79356b A	216	*/
	217	struct mymsg {
	218	long mtype; /* message type (+ve integer) */
	219	char mtext[1]; /* message body */
	220	};
	221
	222	/*
	223	* Based on the configuration parameters described in an SVR2 (yes, two)
	224	* config(1m) man page.
	225	*
	226	* Each message is broken up and stored in segments that are msgssz bytes
	227	* long. For efficiency reasons, this should be a power of two. Also,
	228	* it doesn't make sense if it is less than 8 or greater than about 256.
	229	* Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
	230	* two between 8 and 1024 inclusive (and panic's if it isn't).
	231	*/
	232	struct msginfo {
	233	int msgmax, /* max chars in a message */
	234	msgmni, /* max message queue identifiers */
	235	msgmnb, /* max chars in a queue */
	236	msgtql, /* max messages in system */
	237	msgssz, /* size of a message segment (see notes above) */
	238	msgseg; /* number of message segments */
	239	};
	240	#ifdef KERNEL
	241	extern struct msginfo msginfo;
	242
	243	#ifndef MSGSSZ
	244	#define MSGSSZ 8 /* Each segment must be 2^N long */
	245	#endif
	246	#ifndef MSGSEG
	247	#define MSGSEG 2048 /* must be less than 32767 */
	248	#endif
	249	#define MSGMAX (MSGSSZ*MSGSEG)
	250	#ifndef MSGMNB
	251	#define MSGMNB 2048 /* max # of bytes in a queue */
	252	#endif
	253	#ifndef MSGMNI
	254	#define MSGMNI 40
	255	#endif
	256	#ifndef MSGTQL
	257	#define MSGTQL 40
	258	#endif
	259
	260	/*
	261	* macros to convert between msqid_ds's and msqid's.
	262	* (specific to this implementation)
	263	*/
	264	#define MSQID(ix,ds) ((ix) & 0xffff \| (((ds).msg_perm.seq << 16) & 0xffff0000))
	265	#define MSQID_IX(id) ((id) & 0xffff)
	266	#define MSQID_SEQ(id) (((id) >> 16) & 0xffff)
	267
	268	/*
	269	* The rest of this file is specific to this particular implementation.
	270	*/
	271
	272
	273	/*
	274	* Stuff allocated in machdep.h
	275	*/
	276	struct msgmap {
	277	short next; /* next segment in buffer */
	278	/* -1 -> available */
	279	/* 0..(MSGSEG-1) -> index of next segment */
280	};
281
91447636	282	/* The following four externs really, really need to die; should be static */
1c79356b A	283	extern char msgpool; / MSGMAX byte long msg buffer pool */
	284	extern struct msgmap msgmaps; / MSGSEG msgmap structures */
	285	extern struct msg msghdrs; / MSGTQL msg headers */
91447636	286	extern struct user_msqid_ds msqids; / MSGMNI user_msqid_ds struct's */
1c79356b A	287
	288	#define MSG_LOCKED 01000 /* Is this msqid_ds locked? */
	289
91447636 A	290	#endif /* KERNEL */
	291	#endif /* __APPLE_API_UNSTABLE */
	292	#endif /* !_POSIX_C_SOURCE */
1c79356b A	293
1c79356b A	294	#ifndef KERNEL
1c79356b A	295
1c79356b A	296	__BEGIN_DECLS
91447636 A	297	#ifndef _POSIX_C_SOURCE
	298	int msgsys(int, ...);
	299	#endif /* !_POSIX_C_SOURCE */
	300	int msgctl(int, int, struct msqid_ds *) __DARWIN_ALIAS(msgctl);
	301	int msgget(key_t, int);
	302	ssize_t msgrcv(int, void *, size_t, long, int);
	303	int msgsnd(int, const void *, size_t, int);
1c79356b	304	__END_DECLS
91447636	305
1c79356b A	306	#endif /* !KERNEL */
	307
	308	#endif /* !_SYS_MSG_H_ */