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/* Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. 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>
#include <sys/types.h>
/* Get common definition of System V style IPC. */
#include <sys/ipc.h>
/* Get system dependent definition of `struct msqid_ds' and more. */
#include <sys/msq_buf.h>
__BEGIN_DECLS
/* The following System V style IPC functions implement a message queue
system. The definition is found in XPG2. */
/* Template for struct to be used as argument for `msgsnd' and `msgrcv'. */
struct msgbuf
{
long mtype; /* type of received/sent message */
char mtext[1]; /* text of the message */
};
/* Message queue control operation. */
extern int msgctl __P ((int __msqid, int __cmd, struct msqid_ds *__buf));
/* Get messages queue. */
extern int msgget __P ((key_t __key, int __msgflg));
/* Receive message from message queue. */
extern int msgrcv __P ((int __msqid, void *__msgp, size_t __msgsz,
long __msgtyp, int __msgflg));
/* Send message to message queue. */
extern int msgsnd __P ((int __msqid, void *__msgp, size_t __msgsz,
int __msgflg));
__END_DECLS
#endif /* sys/msg.h */
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