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: src/sys/sys/msg.h,v 1.10.2.1 2000/08/04 22:31:10 peter Exp $ */
    2 /* $DragonFly: src/sys/sys/msg.h,v 1.4 2003/08/27 02:03:22 dillon Exp $ */
    3 /*      $NetBSD: msg.h,v 1.4 1994/06/29 06:44:43 cgd Exp $      */
    4 
    5 /*
    6  * SVID compatible msg.h file
    7  *
    8  * Author:  Daniel Boulet
    9  *
   10  * Copyright 1993 Daniel Boulet and RTMX Inc.
   11  *
   12  * This system call was implemented by Daniel Boulet under contract from RTMX.
   13  *
   14  * Redistribution and use in source forms, with and without modification,
   15  * are permitted provided that this entire comment appears intact.
   16  *
   17  * Redistribution in binary form may occur without any restrictions.
   18  * Obviously, it would be nice if you gave credit where credit is due
   19  * but requiring it would be too onerous.
   20  *
   21  * This software is provided ``AS IS'' without any warranties of any kind.
   22  */
   23 
   24 #ifndef _SYS_MSG_H_
   25 #define _SYS_MSG_H_
   26 
   27 #include <sys/ipc.h>
   28 
   29 /*
   30  * The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct
   31  * are as defined by the SV API Intel 386 Processor Supplement.
   32  */
   33 
   34 #define MSG_NOERROR     010000          /* don't complain about too long msgs */
   35 
   36 struct msg;
   37 
   38 struct msqid_ds {
   39         struct  ipc_perm msg_perm;      /* msg queue permission bits */
   40         struct  msg *msg_first; /* first message in the queue */
   41         struct  msg *msg_last;  /* last message in the queue */
   42         u_long  msg_cbytes;     /* number of bytes in use on the queue */
   43         u_long  msg_qnum;       /* number of msgs in the queue */
   44         u_long  msg_qbytes;     /* max # of bytes on the queue */
   45         pid_t   msg_lspid;      /* pid of last msgsnd() */
   46         pid_t   msg_lrpid;      /* pid of last msgrcv() */
   47         time_t  msg_stime;      /* time of last msgsnd() */
   48         long    msg_pad1;
   49         time_t  msg_rtime;      /* time of last msgrcv() */
   50         long    msg_pad2;
   51         time_t  msg_ctime;      /* time of last msgctl() */
   52         long    msg_pad3;
   53         long    msg_pad4[4];
   54 };
   55 
   56 /*
   57  * Structure describing a message.  The SVID doesn't suggest any
   58  * particular name for this structure.  There is a reference in the
   59  * msgop man page that reads "The structure mymsg is an example of what
   60  * this user defined buffer might look like, and includes the following
   61  * members:".  This sentence is followed by two lines equivalent
   62  * to the mtype and mtext field declarations below.  It isn't clear
   63  * if "mymsg" refers to the naem of the structure type or the name of an
   64  * instance of the structure...
   65  */
   66 struct mymsg {
   67         long    mtype;          /* message type (+ve integer) */
   68         char    mtext[1];       /* message body */
   69 };
   70 
   71 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
   72 
   73 /*
   74  * Based on the configuration parameters described in an SVR2 (yes, two)
   75  * config(1m) man page.
   76  *
   77  * Each message is broken up and stored in segments that are msgssz bytes
   78  * long.  For efficiency reasons, this should be a power of two.  Also,
   79  * it doesn't make sense if it is less than 8 or greater than about 256.
   80  * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
   81  * two between 8 and 1024 inclusive (and panic's if it isn't).
   82  */
   83 struct msginfo {
   84         int     msgmax,         /* max chars in a message */
   85                 msgmni,         /* max message queue identifiers */
   86                 msgmnb,         /* max chars in a queue */
   87                 msgtql,         /* max messages in system */
   88                 msgssz,         /* size of a message segment (see notes above) */
   89                 msgseg;         /* number of message segments */
   90 };
   91 #endif
   92 
   93 #ifdef _KERNEL
   94 extern struct msginfo   msginfo;
   95 #endif
   96 
   97 #ifndef _KERNEL
   98 
   99 #include <sys/cdefs.h>
  100 
  101 __BEGIN_DECLS
  102 int msgsys (int, ...);
  103 int msgctl (int, int, struct msqid_ds *);
  104 int msgget (key_t, int);
  105 int msgsnd (int, void *, size_t, int);
  106 int msgrcv (int, void*, size_t, long, int);
  107 __END_DECLS
  108 #endif
  109 
  110 #endif /* !_SYS_MSG_H_ */

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