mqueue.h

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    1 /*      $NetBSD: mqueue.h,v 1.4.16.2 2009/10/16 06:37:51 snj Exp $      */
    2 
    3 /*
    4  * Copyright (c) 2007-2009 Mindaugas Rasiukevicius <rmind at NetBSD org>
    5  * All rights reserved.
    6  * 
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #ifndef _SYS_MQUEUE_H_
   30 #define _SYS_MQUEUE_H_
   31 
   32 /* Maximal number of mqueue descriptors, that process could open */
   33 #define MQ_OPEN_MAX             512
   34 
   35 /* Maximal priority of the message */
   36 #define MQ_PRIO_MAX             32
   37 
   38 struct mq_attr {
   39         long    mq_flags;       /* Flags of message queue */
   40         long    mq_maxmsg;      /* Maximum number of messages */
   41         long    mq_msgsize;     /* Maximum size of the message */
   42         long    mq_curmsgs;     /* Count of the queued messages */
   43 };
   44 
   45 /* Internal kernel data */
   46 #ifdef _KERNEL
   47 
   48 #include <sys/condvar.h>
   49 #include <sys/mutex.h>
   50 #include <sys/queue.h>
   51 #include <sys/selinfo.h>
   52 #include <sys/types.h>
   53 
   54 /*
   55  * Flags below are used in mq_flags for internal
   56  * purposes, this is appropriate according to POSIX.
   57  */
   58 
   59 /* Message queue is unlinking */
   60 #define MQ_UNLINK               0x10000000
   61 /* There are receive-waiters */
   62 #define MQ_RECEIVE              0x20000000
   63 
   64 /* Maximal length of mqueue name */
   65 #define MQ_NAMELEN              (NAME_MAX + 1)
   66 
   67 /* Default size of the message */
   68 #define MQ_DEF_MSGSIZE          1024
   69 
   70 /* Structure of the message queue */
   71 struct mqueue {
   72         char                    mq_name[MQ_NAMELEN];
   73         kmutex_t                mq_mtx;
   74         kcondvar_t              mq_send_cv;
   75         kcondvar_t              mq_recv_cv;
   76         struct mq_attr          mq_attrib;
   77         /* Notification */
   78         struct selinfo          mq_rsel;
   79         struct selinfo          mq_wsel;
   80         struct sigevent         mq_sig_notify;
   81         struct proc *           mq_notify_proc;
   82         /* Permissions */
   83         mode_t                  mq_mode;
   84         uid_t                   mq_euid;
   85         gid_t                   mq_egid;
   86         /* Reference counter, head of the message queue */
   87         u_int                   mq_refcnt;
   88         TAILQ_HEAD(, mq_msg)    mq_head;
   89         /* Entry of the global list */
   90         LIST_ENTRY(mqueue)      mq_list;
   91 };
   92 
   93 /* Structure of the message */
   94 struct mq_msg {
   95         TAILQ_ENTRY(mq_msg)     msg_queue;
   96         size_t                  msg_len;
   97         u_int                   msg_prio;
   98         uint8_t                 msg_ptr[1];
   99 };
  100 
  101 /* Prototypes */
  102 void    mqueue_sysinit(void);
  103 void    mqueue_print_list(void (*pr)(const char *, ...));
  104 
  105 #endif  /* _KERNEL */
  106 
  107 #endif  /* _SYS_MQUEUE_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/sys/mqueue.h

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sys/sys/mqueue.h