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/* Copyright (C) 1995, 1996, 1997, 1999, 2000 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>
 
/* 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.  */
extern int msgrcv (int __msqid, void *__msgp, size_t __msgsz,
		   long int __msgtyp, int __msgflg) __THROW;
 
/* Send message to message queue.  */
extern int msgsnd (int __msqid, __const void *__msgp, size_t __msgsz,
		   int __msgflg) __THROW;
 
__END_DECLS
 
#endif /* sys/msg.h */