/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2014 Garrett D'Amore <garrett@damore.org>
 *
 * Copyright 1999-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */


#ifndef _SYS_MSG_H
#define _SYS_MSG_H

#include <sys/ipc.h>

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * IPC Message Facility.
 */

/*
 * Implementation Constants.
 */

/*
 * Permission Definitions.
 */
#define MSG_R   0400    /* read permission */
#define MSG_W   0200    /* write permission */

/*
 * ipc_perm Mode Definitions.
 */
#define MSG_RWAIT       01000   /* a reader is waiting for a message */
#define MSG_WWAIT       02000   /* a writer is waiting to send */

/*
 * Message Operation Flags.
 */
#define MSG_NOERROR     010000  /* no error if big message */

typedef unsigned long msgqnum_t;
typedef unsigned long msglen_t;

struct msg;
struct msqid_ds {
        struct ipc_perm msg_perm;       /* operation permission struct */
        struct msg      *msg_first;     /* ptr to first message on q */
        struct msg      *msg_last;      /* ptr to last message on q */
        msglen_t        msg_cbytes;     /* current # bytes on q */
        msgqnum_t       msg_qnum;       /* # of messages on q */
        msglen_t        msg_qbytes;     /* max # of bytes on q */
        pid_t           msg_lspid;      /* pid of last msgsnd */
        pid_t           msg_lrpid;      /* pid of last msgrcv */
#if defined(_LP64)
        time_t          msg_stime;      /* last msgsnd time */
        time_t          msg_rtime;      /* last msgrcv time */
        time_t          msg_ctime;      /* last change time */
#else
        time_t          msg_stime;      /* last msgsnd time */
        int32_t         msg_pad1;       /* reserved for time_t expansion */
        time_t          msg_rtime;      /* last msgrcv time */
        int32_t         msg_pad2;       /* time_t expansion */
        time_t          msg_ctime;      /* last change time */
        int32_t         msg_pad3;       /* time_t expansion */
#endif
        short           msg_cv;
        short           msg_qnum_cv;
        long            msg_pad4[3];    /* reserve area */
};

/*
 * User message buffer template for msgsnd and msgrecv system calls.
 */

#ifdef _KERNEL
struct ipcmsgbuf {
#else
struct msgbuf {
#endif /* _KERNEL */
#if defined(_XOPEN_SOURCE)
        long    _mtype;         /* message type */
        char    _mtext[1];      /* message text */
#else
        long    mtype;          /* message type */
        char    mtext[1];       /* message text */
#endif
};

/*
 * Header and message header structures for msgsnap() system call.
 */
struct msgsnap_head {
        size_t  msgsnap_size;   /* bytes consumed/required in the buffer */
        size_t  msgsnap_nmsg;   /* number of messages in the buffer */
};

struct msgsnap_mhead {
        size_t  msgsnap_mlen;   /* number of bytes in message that follows */
        long    msgsnap_mtype;  /* message type */
};

#if !defined(_KERNEL)
int msgctl(int, int, struct msqid_ds *);
int msgget(key_t, int);
int msgids(int *, uint_t, uint_t *);
int msgsnap(int, void *, size_t, long);
ssize_t msgrcv(int, void *, size_t, long, int);
int msgsnd(int, const void *, size_t, int);
#endif /* ! _KERNEL */

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_MSG_H */