/*
 * Copyright 2008-2012 Haiku, Inc. All Rights Reserved.
 * Distributed under the terms of the MIT License.
 */
#ifndef _SYS_MSG_H
#define _SYS_MSG_H


#include <config/types.h>

#include <sys/cdefs.h>
#include <sys/ipc.h>
#include <sys/types.h>

typedef __haiku_uint32 msgqnum_t;
typedef __haiku_uint32 msglen_t;

/* No error if big message */
#define MSG_NOERROR             010000

struct msqid_ds {
        struct ipc_perm         msg_perm;       /* Operation permission structure */
        msgqnum_t                       msg_qnum;       /* Number of messages currently on queue */
        msglen_t                        msg_qbytes;     /* Max number of bytes allowed on queue */
        pid_t                           msg_lspid;      /* PID of last msgsnd */
        pid_t                           msg_lrpid;      /* PID of last msgrcv */
        time_t                          msg_stime;      /* Time of last msgsnd */
        time_t                          msg_rtime;      /* Time of last msgrcv */
        time_t                          msg_ctime;      /* Time of last change */
};

/* Structure used to send/receive a message */
struct msgbuf {
        long    mtype;          /* message type */
        char    mtext[1];       /* message text */
};

__BEGIN_DECLS

int                     msgctl(int, int, struct msqid_ds *);
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  /* _SYS_MSG_H */