/* Copyright (C) 2003 Krzysztof Benedyczak & Michal Wronski
  
     This program 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.
  
     It 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 this software; if not, write to the Free
     Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     02111-1307 USA.  */
  
  #ifndef _LINUX_MQUEUE_H
  #define _LINUX_MQUEUE_H

  #define MQ_PRIO_MAX 	32768
  /* per-uid limit of kernel memory used by mqueue, in bytes */
  #define MQ_BYTES_MAX	819200
  
  struct mq_attr {

  	__kernel_long_t	mq_flags;	/* message queue flags			*/
  	__kernel_long_t	mq_maxmsg;	/* maximum number of messages		*/
  	__kernel_long_t	mq_msgsize;	/* maximum message size			*/
  	__kernel_long_t	mq_curmsgs;	/* number of messages currently queued	*/
  	__kernel_long_t	__reserved[4];	/* ignored for input, zeroed for output */

  };
  
  /*
   * SIGEV_THREAD implementation:
   * SIGEV_THREAD must be implemented in user space. If SIGEV_THREAD is passed
   * to mq_notify, then
   * - sigev_signo must be the file descriptor of an AF_NETLINK socket. It's not
   *   necessary that the socket is bound.
   * - sigev_value.sival_ptr must point to a cookie that is NOTIFY_COOKIE_LEN
   *   bytes long.
   * If the notification is triggered, then the cookie is sent to the netlink
   * socket. The last byte of the cookie is replaced with the NOTIFY_?? codes:
   * NOTIFY_WOKENUP if the notification got triggered, NOTIFY_REMOVED if it was
   * removed, either due to a close() on the message queue fd or due to a
   * mq_notify() that removed the notification.
   */
  #define NOTIFY_NONE	0
  #define NOTIFY_WOKENUP	1
  #define NOTIFY_REMOVED	2
  
  #define NOTIFY_COOKIE_LEN	32
  
  #endif