118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/* $NetBSD: mqueue.h,v 1.13 2011/04/24 20:17:53 rmind Exp $ */
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/*
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* Copyright (c) 2007-2009 Mindaugas Rasiukevicius <rmind at NetBSD org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _SYS_MQUEUE_H_
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#define _SYS_MQUEUE_H_
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/* Maximal number of mqueue descriptors, that process could open */
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#define MQ_OPEN_MAX 512
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/* Maximal priority of the message */
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#define MQ_PRIO_MAX 32
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struct mq_attr {
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long mq_flags; /* Flags of message queue */
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long mq_maxmsg; /* Maximum number of messages */
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long mq_msgsize; /* Maximum size of the message */
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long mq_curmsgs; /* Count of the queued messages */
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};
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/* Internal kernel data */
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#ifdef _KERNEL
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#include <sys/condvar.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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#include <sys/selinfo.h>
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#include <sys/types.h>
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/*
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* Flags below are used in mq_flags for internal purposes.
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* This is permitted according to POSIX.
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*/
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/* Message queue is unlinked */
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#define MQ_UNLINKED 0x10000000
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/* There are receive-waiters */
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#define MQ_RECEIVE 0x20000000
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/* Maximal length of mqueue name */
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#define MQ_NAMELEN (NAME_MAX + 1)
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/* Default size of the message */
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#define MQ_DEF_MSGSIZE 1024
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/* Size/bits and index of reserved queue */
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#define MQ_PQSIZE 32
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#define MQ_PQRESQ 0
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/* Structure of the message queue. */
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typedef struct mqueue {
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char * mq_name;
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kmutex_t mq_mtx;
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kcondvar_t mq_send_cv;
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kcondvar_t mq_recv_cv;
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struct mq_attr mq_attrib;
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/* Notification */
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struct selinfo mq_rsel;
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struct selinfo mq_wsel;
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struct sigevent mq_sig_notify;
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struct proc * mq_notify_proc;
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/* Permissions */
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mode_t mq_mode;
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uid_t mq_euid;
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gid_t mq_egid;
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/* Reference counter, queue array and bitmap */
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u_int mq_refcnt;
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TAILQ_HEAD(, mq_msg) mq_head[1 + MQ_PQSIZE];
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uint32_t mq_bitmap;
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/* Entry of the global list */
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LIST_ENTRY(mqueue) mq_list;
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/* Time stamps */
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struct timespec mq_atime;
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struct timespec mq_mtime;
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struct timespec mq_btime;
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} mqueue_t;
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/* Structure of the message. */
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typedef struct mq_msg {
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TAILQ_ENTRY(mq_msg) msg_queue;
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size_t msg_len;
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u_int msg_prio;
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uint8_t msg_ptr[1];
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} mq_msg_t;
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/* Prototypes */
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void mqueue_print_list(void (*pr)(const char *, ...));
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int mq_send1(mqd_t, const char *, size_t, u_int, struct timespec *);
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int mq_recv1(mqd_t, void *, size_t, u_int *, struct timespec *, ssize_t *);
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#endif /* _KERNEL */
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#endif /* _SYS_MQUEUE_H_ */
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