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Annotation of researchv9/sys.vax/h/stream.h, revision 1.1

1.1     ! root        1: #define        QPCTL   0100            /* priority control message */
        !             2: #define        QBSIZE  64              /* "standard" size of queue block*/
        !             3: #define QBBSIZE 1024           /* size of a big queue block */
        !             4: 
        !             5: /*
        !             6:  * data queue
        !             7:  */
        !             8: struct queue {
        !             9:        struct  qinit   *qinfo;         /* procs and limits for queue */
        !            10:        struct  block   *first;         /* first data block */
        !            11:        struct  block   *last;          /* last data block */
        !            12:        struct  queue   *next;          /* Q of next stream */
        !            13:        struct  queue   *link;          /* to next Q for scheduling */
        !            14:        caddr_t ptr;                    /* to private data structure */
        !            15:        short   count;                  /* number of blocks on Q */
        !            16:        u_short flag;
        !            17: };
        !            18: 
        !            19: /* Queue flags */
        !            20: #define        QENAB   01                      /* Queue is already enabled to run */
        !            21: #define        QWANTR  02                      /* Someone wants to read Q */
        !            22: #define        QWANTW  04                      /* Someone wants to write Q */
        !            23: #define        QFULL   010                     /* Q is considered full */
        !            24: #define        QREADR  020                     /* This is the reader (first) Q */
        !            25: #define        QUSE    040                     /* This queue in use (allocation) */
        !            26: #define        QNOENB  0100                    /* Don't enable Q via putq */
        !            27: #define        QDELIM  0200                    /* This queue generates delimiters */
        !            28: #define        QBIGB   0400                    /* This queue would like big blocks */
        !            29: 
        !            30: /*
        !            31:  * queue information structure
        !            32:  */
        !            33: struct qinit {
        !            34:        int     (*putp)();              /* put procedure */
        !            35:        int     (*srvp)();              /* service procedure */
        !            36:        long    (*qopen)();             /* called on startup */
        !            37:        int     (*qclose)();            /* called on finish */
        !            38:        short   limit;                  /* high water mark */
        !            39:        short   lolimit;                /* low water mark */
        !            40: };
        !            41: 
        !            42: #define        OTHERQ(q)       ((q)->flag&QREADR? (q)+1: (q)-1)
        !            43: #define        WR(q)           (q+1)
        !            44: #define        RD(q)           (q-1)
        !            45: 
        !            46: /*
        !            47:  * Queue data block
        !            48:  */
        !            49: struct block {
        !            50:        struct  block   *next;
        !            51:        u_char  *rptr;
        !            52:        u_char  *wptr;
        !            53:        u_char  *lim;
        !            54:        u_char  *base;
        !            55:        char    type;
        !            56:        char    class;
        !            57: };
        !            58: 
        !            59: /*
        !            60:  * Header for a stream: interface to rest of system
        !            61:  */
        !            62: struct stdata {
        !            63:        struct  queue *wrq;             /* write queue */
        !            64:        struct  block *iocblk;          /* return block for ioctl */
        !            65:        struct  inode *inode;           /* backptr, for hangups */
        !            66:        struct  proc *wsel;             /* process write-selecting */
        !            67:        struct  proc *rsel;             /* process read-selecting */
        !            68:        short   pgrp;                   /* process group, for signals */
        !            69:        short   flag;
        !            70:        char    count;                  /* # processes in stream routines */
        !            71: };
        !            72: #define        IOCWAIT 01                      /* Someone wants to do ioctl */
        !            73: #define RSLEEP 02                      /* Someone wants to read */
        !            74: #define        WSLEEP  04                      /* Someone wants to write */
        !            75: #define        HUNGUP  010                     /* Device has vanished */
        !            76: #define        RSEL    020                     /* read-select collision*/
        !            77: #define        WSEL    040                     /* write-select collision */
        !            78: #define        EXCL    0100                    /* exclusive-use (no opens) */
        !            79: #define        STWOPEN 0200                    /* waiting for 1st open */
        !            80: 
        !            81: struct block   *getq();
        !            82: int    putq();
        !            83: struct block   *allocb();
        !            84: struct queue   *backq();
        !            85: struct queue   *allocq();
        !            86: struct inode   *stopen();
        !            87: 
        !            88: /*
        !            89:  * Control messages (regular priority)
        !            90:  */
        !            91: #define        M_DATA  0               /* regular data (not ctl) */
        !            92: #define        M_BREAK 01              /* line break */
        !            93: #define        M_HANGUP 02             /* line disconnect */
        !            94: #define        M_DELIM 03              /* data delimiter */
        !            95: #define        M_ECHO  04              /* request ACK (1 param) */
        !            96: #define        M_ACK   05              /* response to ECHO (1 param) */
        !            97: #define        M_IOCTL 06              /* ioctl; set/get params */
        !            98: #define        M_DELAY 07              /* real-time xmit delay (1 param) */
        !            99: #define        M_CTL   010             /* device-specific control message */
        !           100: #define        M_PASS  011             /* pass file */
        !           101: #define        M_YDEL  012             /* stream has started generating delims */
        !           102: #define        M_NDEL  013             /* stream has stopped generating delims */
        !           103: 
        !           104: /*
        !           105:  * Control messages (high priority; go to head of queue)
        !           106:  */
        !           107: #define        M_SIGNAL 0101           /* generate process signal */
        !           108: #define        M_FLUSH 0102            /* flush your queues */
        !           109: #define        M_STOP  0103            /* stop transmission immediately */
        !           110: #define        M_START 0104            /* restart transmission after stop */
        !           111: #define        M_IOCACK 0105           /* acknowledge ioctl */
        !           112: #define        M_IOCNAK 0106           /* negative ioctl acknowledge */
        !           113: #define        M_CLOSE 0107            /* channel closes (dk only) */
        !           114: #define        M_IOCWAIT 0110          /* stop ioctl timeout, ack/nak follows later */
        !           115: 
        !           116: #define        setqsched()     mtpr(SIRR, 0x3);
        !           117: 
        !           118: /*
        !           119:  * for passing files across streams
        !           120:  */
        !           121: struct kpassfd {
        !           122:        union  {
        !           123:                struct  file *fp;
        !           124:                int     fd;
        !           125:        } f;
        !           126:        short   uid;
        !           127:        short   gid;
        !           128:        short   nice;
        !           129:        char    logname[8];
        !           130: };
        !           131: 
        !           132: /*
        !           133:  * header for messages, see mesg.c
        !           134:  */
        !           135: 
        !           136: struct mesg {
        !           137:        char    type;
        !           138:        u_char  magic;
        !           139:        u_char  losize, hisize;
        !           140: };
        !           141: 
        !           142: #define        MSGMAGIC        0345
        !           143: #define        MSGHLEN 4       /* true length of struct mesg in bytes */

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