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: releng/6.3/sys/sys/msg.h 173886 2007-11-24 19:45:58Z cvs2svn $ */
    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/cdefs.h>
   27 #include <sys/_types.h>
   28 #include <sys/ipc.h>
   29 
   30 /*
   31  * The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct
   32  * are as defined by the SV API Intel 386 Processor Supplement.
   33  */
   34 
   35 #define MSG_NOERROR     010000          /* don't complain about too long msgs */
   36 
   37 typedef unsigned long   msglen_t;
   38 typedef unsigned long   msgqnum_t;
   39 
   40 #ifndef _PID_T_DECLARED
   41 typedef __pid_t         pid_t;
   42 #define _PID_T_DECLARED
   43 #endif
   44 
   45 #ifndef _SIZE_T_DECLARED
   46 typedef __size_t        size_t;
   47 #define _SIZE_T_DECLARED
   48 #endif
   49 
   50 #ifndef _SSIZE_T_DECLARED
   51 typedef __ssize_t       ssize_t;
   52 #define _SSIZE_T_DECLARED
   53 #endif
   54 
   55 #ifndef _TIME_T_DECLARED
   56 typedef __time_t        time_t;
   57 #define _TIME_T_DECLARED
   58 #endif
   59 
   60 /*
   61  * XXX there seems to be no prefix reserved for this header, so the name
   62  * "msg" in "struct msg" and the names of all of the nonstandard members
   63  * (mainly "msg_pad*) are namespace pollution.
   64  */
   65 
   66 struct msqid_ds {
   67         struct  ipc_perm msg_perm;      /* msg queue permission bits */
   68         struct  msg *msg_first; /* first message in the queue */
   69         struct  msg *msg_last;  /* last message in the queue */
   70         msglen_t msg_cbytes;    /* number of bytes in use on the queue */
   71         msgqnum_t msg_qnum;     /* number of msgs in the queue */
   72         msglen_t msg_qbytes;    /* max # of bytes on the queue */
   73         pid_t   msg_lspid;      /* pid of last msgsnd() */
   74         pid_t   msg_lrpid;      /* pid of last msgrcv() */
   75         time_t  msg_stime;      /* time of last msgsnd() */
   76         long    msg_pad1;
   77         time_t  msg_rtime;      /* time of last msgrcv() */
   78         long    msg_pad2;
   79         time_t  msg_ctime;      /* time of last msgctl() */
   80         long    msg_pad3;
   81         long    msg_pad4[4];
   82 };
   83 
   84 #if __BSD_VISIBLE
   85 /*
   86  * Structure describing a message.  The SVID doesn't suggest any
   87  * particular name for this structure.  There is a reference in the
   88  * msgop man page that reads "The structure mymsg is an example of what
   89  * this user defined buffer might look like, and includes the following
   90  * members:".  This sentence is followed by two lines equivalent
   91  * to the mtype and mtext field declarations below.  It isn't clear
   92  * if "mymsg" refers to the name of the structure type or the name of an
   93  * instance of the structure...
   94  */
   95 struct mymsg {
   96         long    mtype;          /* message type (+ve integer) */
   97         char    mtext[1];       /* message body */
   98 };
   99 #endif
  100 
  101 #ifdef _KERNEL
  102 
  103 struct msg {
  104         struct  msg *msg_next;  /* next msg in the chain */
  105         long    msg_type;       /* type of this message */
  106                                 /* >0 -> type of this message */
  107                                 /* 0 -> free header */
  108         u_short msg_ts;         /* size of this message */
  109         short   msg_spot;       /* location of start of msg in buffer */
  110         struct  label *label;   /* MAC Framework label */
  111 };
  112 
  113 /*
  114  * Based on the configuration parameters described in an SVR2 (yes, two)
  115  * config(1m) man page.
  116  *
  117  * Each message is broken up and stored in segments that are msgssz bytes
  118  * long.  For efficiency reasons, this should be a power of two.  Also,
  119  * it doesn't make sense if it is less than 8 or greater than about 256.
  120  * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
  121  * two between 8 and 1024 inclusive (and panic's if it isn't).
  122  */
  123 struct msginfo {
  124         int     msgmax,         /* max chars in a message */
  125                 msgmni,         /* max message queue identifiers */
  126                 msgmnb,         /* max chars in a queue */
  127                 msgtql,         /* max messages in system */
  128                 msgssz,         /* size of a message segment (see notes above) */
  129                 msgseg;         /* number of message segments */
  130 };
  131 extern struct msginfo   msginfo;
  132 
  133 /*
  134  * Kernel wrapper for the user-level structure.
  135  */
  136 struct msqid_kernel {
  137         /*
  138          * Data structure exposed to user space.
  139          */
  140         struct  msqid_ds u;
  141 
  142         /*
  143          * Kernel-private components of the message queue.
  144          */
  145         struct  label *label;   /* MAC label */
  146 };
  147 
  148 #else /* !_KERNEL */
  149 
  150 __BEGIN_DECLS
  151 int msgctl(int, int, struct msqid_ds *);
  152 int msgget(key_t, int);
  153 /* XXX return value should be ssize_t. */
  154 int msgrcv(int, void *, size_t, long, int);
  155 int msgsnd(int, const void *, size_t, int);
  156 #if __BSD_VISIBLE
  157 int msgsys(int, ...);
  158 #endif
  159 __END_DECLS
  160 
  161 #endif /* _KERNEL */
  162 
  163 #endif /* !_SYS_MSG_H_ */

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