/* Copyright (C) 1995-1997,1999,2000,2003,2006,2007
Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */

#ifndef _SYS_MSG_H
#define _SYS_MSG_H

#include <features.h>

#define __need_size_t
#include <stddef.h>

/* Get common definition of System V style IPC. */
#include <sys/ipc.h>

/* Get system dependent definition of `struct msqid_ds' and more. */
#include <bits/msq.h>

/* Define types required by the standard. */
#define __need_time_t
#include <time.h>

#ifndef __pid_t_defined
typedef __pid_t pid_t;
# define __pid_t_defined
#endif

#ifndef __ssize_t_defined
typedef __ssize_t ssize_t;
# define __ssize_t_defined
#endif

/* The following System V style IPC functions implement a message queue
system. The definition is found in XPG2. */

#ifdef __USE_GNU
/* Template for struct to be used as argument for `msgsnd' and `msgrcv'. */
struct msgbuf
{
long int mtype; /* type of received/sent message */
char mtext[1]; /* text of the message */
};
#endif


__BEGIN_DECLS

/* Message queue control operation. */
extern int msgctl (int __msqid, int __cmd, struct msqid_ds *__buf) __THROW;

/* Get messages queue. */
extern int msgget (key_t __key, int __msgflg) __THROW;

/* Receive message from message queue.

This function is a cancellation point and therefore not marked with
__THROW. */
extern ssize_t msgrcv (int __msqid, void *__msgp, size_t __msgsz,
long int __msgtyp, int __msgflg);

/* Send message to message queue.

This function is a cancellation point and therefore not marked with
__THROW. */
extern int msgsnd (int __msqid, __const void *__msgp, size_t __msgsz,
int __msgflg);

__END_DECLS

#endif /* sys/msg.h */