sys/sys/msg.h

   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_ */