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

     /*      $NetBSD: msg.h,v 1.22 2008/04/28 20:24:11 martin Exp $  */
     
     /*-
      * Copyright (c) 1999, 2007 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
      * NASA Ames Research Center, and by Andrew Doran.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    /*
     * SVID compatible msg.h file
     *
     * Author:  Daniel Boulet
     *
     * Copyright 1993 Daniel Boulet and RTMX Inc.
     *
     * This system call was implemented by Daniel Boulet under contract from RTMX.
     *
     * Redistribution and use in source forms, with and without modification,
     * are permitted provided that this entire comment appears intact.
     *
     * Redistribution in binary form may occur without any restrictions.
     * Obviously, it would be nice if you gave credit where credit is due
     * but requiring it would be too onerous.
     *
     * This software is provided ``AS IS'' without any warranties of any kind.
     */
    
    #ifndef _SYS_MSG_H_
    #define _SYS_MSG_H_
    
    #include <sys/featuretest.h>
    #include <sys/ipc.h>
    #ifdef _KERNEL
    #include <sys/condvar.h>
    #include <sys/mutex.h>
    #endif
    
    #ifdef _KERNEL
    struct __msg {
            struct  __msg *msg_next; /* next msg in the chain */
            long    msg_type;       /* type of this message */
                                    /* >0 -> type of this message */
                                    /* 0 -> free header */
            u_short msg_ts;         /* size of this message */
            short   msg_spot;       /* location of start of msg in buffer */
    };
    #endif /* _KERNEL */
    
    #define MSG_NOERROR     010000          /* don't complain about too long msgs */
    
    typedef unsigned long   msgqnum_t;
    typedef size_t          msglen_t;
    
    struct msqid_ds {
            struct ipc_perm msg_perm;       /* operation permission strucure */
            msgqnum_t       msg_qnum;       /* number of messages in the queue */
            msglen_t        msg_qbytes;     /* max # of bytes in the queue */
            pid_t           msg_lspid;      /* process ID of last msgsend() */
            pid_t           msg_lrpid;      /* process ID of last msgrcv() */
            time_t          msg_stime;      /* time of last msgsend() */
            time_t          msg_rtime;      /* time of last msgrcv() */
            time_t          msg_ctime;      /* time of last change */
    
            /*
             * These members are private and used only in the internal
             * implementation of this interface.
             */
            struct __msg    *_msg_first;    /* first message in the queue */
            struct __msg    *_msg_last;     /* last message in the queue */
            msglen_t        _msg_cbytes;    /* # of bytes currently in queue */
    };
    
    #if defined(_NETBSD_SOURCE)
    /*
     * Based on the configuration parameters described in an SVR2 (yes, two)
    * config(1m) man page.
    *
    * Each message is broken up and stored in segments that are msgssz bytes
    * long.  For efficiency reasons, this should be a power of two.  Also,
    * it doesn't make sense if it is less than 8 or greater than about 256.
    * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
    * two between 8 and 1024 inclusive (and panic's if it isn't).
    */
   struct msginfo {
           int32_t msgmax;         /* max chars in a message */
           int32_t msgmni;         /* max message queue identifiers */
           int32_t msgmnb;         /* max chars in a queue */
           int32_t msgtql;         /* max messages in system */
           int32_t msgssz;         /* size of a message segment
                                      (see notes above) */
           int32_t msgseg;         /* number of message segments */
   };
   
   /* Warning: 64-bit structure padding is needed here */
   struct msgid_ds_sysctl {
           struct          ipc_perm_sysctl msg_perm;
           uint64_t        msg_qnum;
           uint64_t        msg_qbytes;
           uint64_t        _msg_cbytes;
           pid_t           msg_lspid;
           pid_t           msg_lrpid;
           time_t          msg_stime;
           time_t          msg_rtime;
           time_t          msg_ctime;
           int32_t         pad;
   };
   struct msg_sysctl_info {
           struct  msginfo msginfo;
           struct  msgid_ds_sysctl msgids[1];
   };
   #endif /* !_POSIX_C_SOURCE && !_XOPEN_SOURCE */
   
   #ifdef _KERNEL
   
   #ifndef MSGSSZ
   #define MSGSSZ  8               /* Each segment must be 2^N long */
   #endif
   #ifndef MSGSEG
   #define MSGSEG  2048            /* must be less than 32767 */
   #endif
   #undef MSGMAX                   /* ALWAYS compute MGSMAX! */
   #define MSGMAX  (MSGSSZ*MSGSEG)
   #ifndef MSGMNB
   #define MSGMNB  2048            /* max # of bytes in a queue */
   #endif
   #ifndef MSGMNI
   #define MSGMNI  40
   #endif
   #ifndef MSGTQL
   #define MSGTQL  40
   #endif
   
   /*
    * macros to convert between msqid_ds's and msqid's.
    */
   #define MSQID(ix,ds)    ((ix) & 0xffff | (((ds).msg_perm._seq << 16) & 0xffff0000))
   #define MSQID_IX(id)    ((id) & 0xffff)
   #define MSQID_SEQ(id)   (((id) >> 16) & 0xffff)
   
   /*
    * Stuff allocated in machdep.h
    */
   struct msgmap {
           short   next;           /* next segment in buffer */
                                   /* -1 -> available */
                                   /* 0..(MSGSEG-1) -> index of next segment */
   };
   
   typedef struct kmsq {
           struct msqid_ds msq_u;
           kcondvar_t      msq_cv;
   } kmsq_t;
   
   extern struct msginfo msginfo;
   extern kmsq_t   *msqs;          /* MSGMNI queues */
   extern kmutex_t msgmutex;
   
   #define MSG_LOCKED      01000   /* Is this msqid_ds locked? */
   
   #endif /* _KERNEL */
   
   #ifndef _KERNEL
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   int     msgctl(int, int, struct msqid_ds *) __RENAME(__msgctl13);
   int     msgget(key_t, int);
   int     msgsnd(int, const void *, size_t, int);
   ssize_t msgrcv(int, void *, size_t, long, int);
   __END_DECLS
   #else
   #include <sys/systm.h>
   
   struct proc;
   
   void    msginit(void);
   int     msgctl1(struct lwp *, int, int, struct msqid_ds *);
   int     msgsnd1(struct lwp *, int, const char *, size_t, int, size_t,
       copyin_t);
   int     msgrcv1(struct lwp *, int, char *, size_t, long, int, size_t,
       copyout_t, register_t *);
   #endif /* !_KERNEL */
   
   #endif /* !_SYS_MSG_H_ */

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