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- /* $NetBSD: msg.h,v 1.9 1996/02/09 18:25:18 christos Exp $ */
-
- /*
- * 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/ipc.h>
-
- /* Extra msgctl() cmd defines to retrieve pointers to msginfo and msqids */
- #define GETMSGINFO 8
- #define GETMSQIDSA 9
-
- /*
- * The MSG_NOERROR identifier value, the msqid_ds struct and the msg struct
- * are as defined by the SV API Intel 386 Processor Supplement.
- */
-
- #define MSG_NOERROR 010000 /* don't complain about too long msgs */
-
- struct msqid_ds {
- struct ipc_perm msg_perm; /* msg queue permission bits */
- struct msg *msg_first; /* first message in the queue */
- struct msg *msg_last; /* last message in the queue */
- u_long msg_cbytes; /* number of bytes in use on the queue */
- u_long msg_qnum; /* number of msgs in the queue */
- u_long msg_qbytes; /* max # of bytes on the queue */
- pid_t msg_lspid; /* pid of last msgsnd() */
- pid_t msg_lrpid; /* pid of last msgrcv() */
- time_t msg_stime; /* time of last msgsnd() */
- long msg_pad1;
- time_t msg_rtime; /* time of last msgrcv() */
- long msg_pad2;
- time_t msg_ctime; /* time of last msgctl() */
- long msg_pad3;
- long msg_pad4[4];
- };
-
- 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 */
- };
-
- /*
- * Structure describing a message. The SVID doesn't suggest any
- * particular name for this structure. There is a reference in the
- * msgop man page that reads "The structure mymsg is an example of what
- * this user defined buffer might look like, and includes the following
- * members:". This sentence is followed by two lines equivalent
- * to the mtype and mtext field declarations below. It isn't clear
- * if "mymsg" refers to the naem of the structure type or the name of an
- * instance of the structure...
- */
- struct mymsg {
- long mtype; /* message type (+ve integer) */
- char mtext[1]; /* message body */
- };
-
-
- #ifdef _KERNEL
- /*
- * 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 {
- int msgmax, /* max chars in a message */
- msgmni, /* max message queue identifiers */
- msgmnb, /* max chars in a queue */
- msgtql, /* max messages in system */
- msgssz, /* size of a message segment (see notes above) */
- msgseg; /* number of message segments */
- };
- //struct msginfo msginfo;
-
- #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.
- * (specific to this implementation)
- */
- #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)
- #endif
-
- /*
- * The rest of this file is specific to this particular implementation.
- */
-
- #ifdef _KERNEL
-
- /*
- * Stuff allocated in machdep.h
- */
- struct msgmap {
- short next; /* next segment in buffer */
- /* -1 -> available */
- /* 0..(MSGSEG-1) -> index of next segment */
- };
-
- #if 0
- char *msgpool; /* MSGMAX byte long msg buffer pool */
- struct msgmap *msgmaps; /* MSGSEG msgmap structures */
- struct msg *msghdrs; /* MSGTQL msg headers */
- struct msqid_ds *msqids; /* MSGMNI msqid_ds struct's */
- #endif
-
- #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */
-
- #endif
-
- #ifndef _KERNEL
- #include <sys/cdefs.h>
-
- __BEGIN_DECLS
- int msgctl __P((int, int, struct msqid_ds *));
- int msgget __P((key_t, int));
- int msgsnd __P((int, void *, size_t, int));
- int msgrcv __P((int, void *, size_t, long, int));
- __END_DECLS
- #else
- void msginit __P((void));
- #endif /* !_KERNEL */
-
- #endif /* !_SYS_MSG_H_ */
-