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/*
* Project: S.Ha.R.K.
*
* Coordinators:
* Giorgio Buttazzo <giorgio@sssup.it>
* Paolo Gai <pj@gandalf.sssup.it>
*
* Authors :
* Paolo Gai <pj@gandalf.sssup.it>
* Massimiliano Giorgi <massy@gandalf.sssup.it>
* Luca Abeni <luca@gandalf.sssup.it>
* (see the web pages for full authors list)
*
* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
*
* http://www.sssup.it
* http://retis.sssup.it
* http://shark.sssup.it
*/
/**
------------
CVS : $Id: mqueue.h,v 1.1.1.1 2002-03-29 14:12:51 pj Exp $
File: $File$
Revision: $Revision: 1.1.1.1 $
Last update: $Date: 2002-03-29 14:12:51 $
------------
POSIX message queues:
- mq names have not a correspondence into the File System.
- a message queue can only be opened with the O_RDWR flag
(there is only a process!!!)
**/
/*
* Copyright (C) 2000 Paolo Gai
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __MQUEUE_H__
#define __MQUEUE_H__
#include <sys/types.h>
#include <fcntl.h>
#include <time.h>
#include <signal.h>
typedef int mqd_t;
struct mq_attr {
long mq_flags; /* Message queue flags */
long mq_maxmsg; /* maximum number of messages */
long mq_msgsize; /* Maximum message size */
long mq_curmsgs; /* Number of messages currently queued */
};
// non-standard defaults limits used into mq_open when no mqstat is defined
#define MQ_DEFAULT_MAXMSG 10
#define MQ_DEFAULT_MSGSIZE 128
// defined into the POSIX Standard, 15.1.1
mqd_t mq_open(const char *name, int oflag, ...);
int mq_close(mqd_t mqdes);
int mq_unlink(const char *name);
int mq_send(mqd_t mqdes, const char *msg_ptr, size_t msg_len,
unsigned int msg_prio);
ssize_t mq_receive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
unsigned int *msg_prio);
int mq_notify(mqd_t mqdes, const struct sigevent *notification);
int mq_setattr(mqd_t mqdes, const struct mq_attr *mqstat,
struct mq_attr *omqstat);
int mq_getattr(mqd_t mqdes, struct mq_attr *mqstat);
#endif