The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /* $FreeBSD$ */
    2 /*      $NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $      */
    3 
    4 /*
    5  * SVID compatible msg.h file
    6  *
    7  * Author:  Daniel Boulet
    8  *
    9  * Copyright 1993 Daniel Boulet and RTMX Inc.
   10  *
   11  * This system call was implemented by Daniel Boulet under contract from RTMX.
   12  *
   13  * Redistribution and use in source forms, with and without modification,
   14  * are permitted provided that this entire comment appears intact.
   15  *
   16  * Redistribution in binary form may occur without any restrictions.
   17  * Obviously, it would be nice if you gave credit where credit is due
   18  * but requiring it would be too onerous.
   19  *
   20  * This software is provided ``AS IS'' without any warranties of any kind.
   21  */
   22 
   23 #ifndef _SYS_MSG_H_
   24 #define _SYS_MSG_H_
   25 
   26 #include <sys/ipc.h>
   27 
   28 /*
   29  * The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct
   30  * are as defined by the SV API Intel 386 Processor Supplement.
   31  */
   32 
   33 #define MSG_NOERROR     010000          /* don't complain about too long msgs */
   34 
   35 struct msqid_ds {
   36         struct  ipc_perm msg_perm;      /* msg queue permission bits */
   37         struct  msg *msg_first; /* first message in the queue */
   38         struct  msg *msg_last;  /* last message in the queue */
   39         u_long  msg_cbytes;     /* number of bytes in use on the queue */
   40         u_long  msg_qnum;       /* number of msgs in the queue */
   41         u_long  msg_qbytes;     /* max # of bytes on the queue */
   42         pid_t   msg_lspid;      /* pid of last msgsnd() */
   43         pid_t   msg_lrpid;      /* pid of last msgrcv() */
   44         time_t  msg_stime;      /* time of last msgsnd() */
   45         long    msg_pad1;
   46         time_t  msg_rtime;      /* time of last msgrcv() */
   47         long    msg_pad2;
   48         time_t  msg_ctime;      /* time of last msgctl() */
   49         long    msg_pad3;
   50         long    msg_pad4[4];
   51 };
   52 
   53 struct msg {
   54         struct  msg *msg_next;  /* next msg in the chain */
   55         long    msg_type;       /* type of this message */
   56                                 /* >0 -> type of this message */
   57                                 /* 0 -> free header */
   58         u_short msg_ts;         /* size of this message */
   59         short   msg_spot;       /* location of start of msg in buffer */
   60 };
   61 
   62 /*
   63  * Structure describing a message.  The SVID doesn't suggest any
   64  * particular name for this structure.  There is a reference in the
   65  * msgop man page that reads "The structure mymsg is an example of what
   66  * this user defined buffer might look like, and includes the following
   67  * members:".  This sentence is followed by two lines equivalent
   68  * to the mtype and mtext field declarations below.  It isn't clear
   69  * if "mymsg" refers to the naem of the structure type or the name of an
   70  * instance of the structure...
   71  */
   72 struct mymsg {
   73         long    mtype;          /* message type (+ve integer) */
   74         char    mtext[1];       /* message body */
   75 };
   76 
   77 /*
   78  * Based on the configuration parameters described in an SVR2 (yes, two)
   79  * config(1m) man page.
   80  *
   81  * Each message is broken up and stored in segments that are msgssz bytes
   82  * long.  For efficiency reasons, this should be a power of two.  Also,
   83  * it doesn't make sense if it is less than 8 or greater than about 256.
   84  * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
   85  * two between 8 and 1024 inclusive (and panic's if it isn't).
   86  */
   87 struct msginfo {
   88         int     msgmax,         /* max chars in a message */
   89                 msgmni,         /* max message queue identifiers */
   90                 msgmnb,         /* max chars in a queue */
   91                 msgtql,         /* max messages in system */
   92                 msgssz,         /* size of a message segment (see notes above) */
   93                 msgseg;         /* number of message segments */
   94 };
   95 #ifdef KERNEL
   96 extern struct msginfo   msginfo;
   97 
   98 #ifndef MSGSSZ
   99 #define MSGSSZ  8               /* Each segment must be 2^N long */
  100 #endif
  101 #ifndef MSGSEG
  102 #define MSGSEG  2048            /* must be less than 32767 */
  103 #endif
  104 #define MSGMAX  (MSGSSZ*MSGSEG)
  105 #ifndef MSGMNB
  106 #define MSGMNB  2048            /* max # of bytes in a queue */
  107 #endif
  108 #ifndef MSGMNI
  109 #define MSGMNI  40
  110 #endif
  111 #ifndef MSGTQL
  112 #define MSGTQL  40
  113 #endif
  114 
  115 /*
  116  * macros to convert between msqid_ds's and msqid's.
  117  * (specific to this implementation)
  118  */
  119 #define MSQID(ix,ds)    ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000))
  120 #define MSQID_IX(id)    ((id) & 0xffff)
  121 #define MSQID_SEQ(id)   (((id) >> 16) & 0xffff)
  122 
  123 /*
  124  * The rest of this file is specific to this particular implementation.
  125  */
  126 
  127 
  128 /*
  129  * Stuff allocated in machdep.h
  130  */
  131 struct msgmap {
  132         short   next;           /* next segment in buffer */
  133                                 /* -1 -> available */
  134                                 /* 0..(MSGSEG-1) -> index of next segment */
  135 };
  136 
  137 extern char *msgpool;           /* MSGMAX byte long msg buffer pool */
  138 extern struct msgmap *msgmaps;  /* MSGSEG msgmap structures */
  139 extern struct msg *msghdrs;     /* MSGTQL msg headers */
  140 extern struct msqid_ds *msqids; /* MSGMNI msqid_ds struct's */
  141 
  142 #define MSG_LOCKED      01000   /* Is this msqid_ds locked? */
  143 
  144 #endif /* KERNEL */
  145 
  146 #ifndef KERNEL
  147 #include <sys/cdefs.h>
  148 
  149 __BEGIN_DECLS
  150 int msgsys __P((int, ...));
  151 int msgctl __P((int, int, struct msqid_ds *));
  152 int msgget __P((key_t, int));
  153 int msgsnd __P((int, void *, size_t, int));
  154 int msgrcv __P((int, void*, size_t, long, int));
  155 __END_DECLS
  156 #endif /* !KERNEL */
  157 
  158 #endif /* !_SYS_MSG_H_ */

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