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Annotation of researchv10dc/lsys/sys/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;          /* next in chain */
        !            51:        u_char  *rptr;                  /* first unconsumed data */
        !            52:        u_char  *wptr;                  /* next unwritten data */
        !            53:        u_char  *lim;                   /* max for wptr */
        !            54:        u_char  *base;                  /* min for rptr/wptr */
        !            55:        u_char  type;                   /* type of block contents */
        !            56:        u_char  class;                  /* size class (plus S_DELIM flag) */
        !            57:        u_char  bufix;                  /* buffer index (for io maps) */
        !            58:        u_char  rbufix;                 /* real index for anon block */
        !            59:        u_char  data[4];                /* data contents for tiny blocks */
        !            60: };
        !            61: 
        !            62: #define        NOBUFIX 255
        !            63: #define        S_DELIM 0200                    /* This block is followed by a delimiter */
        !            64: #define        CL_MASK 0177
        !            65: 
        !            66: /*
        !            67:  * Header for a stream: interface to rest of system
        !            68:  */
        !            69: struct stdata {
        !            70:        struct  queue *wrq;             /* write queue */
        !            71:        struct  block *iocblk;          /* return block for ioctl */
        !            72:        struct  inode *inode;           /* backptr, for hangups */
        !            73:        struct  proc *wsel;             /* process write-selecting */
        !            74:        struct  proc *rsel;             /* process read-selecting */
        !            75:        short   pgrp;                   /* process group, for signals */
        !            76:        short   flag;
        !            77:        char    count;                  /* # processes in stream routines */
        !            78: };
        !            79: #define        IOCWAIT 01                      /* Someone wants to do ioctl */
        !            80: #define RSLEEP 02                      /* Someone wants to read */
        !            81: #define        WSLEEP  04                      /* Someone wants to write */
        !            82: #define        HUNGUP  010                     /* Device has vanished */
        !            83: #define        RSEL    020                     /* read-select collision*/
        !            84: #define        WSEL    040                     /* write-select collision */
        !            85: #define        EXCL    0100                    /* exclusive-use (no opens) */
        !            86: #define        STWOPEN 0200                    /* waiting for 1st open */
        !            87: 
        !            88: #ifdef KERNEL
        !            89: struct block   *getq();
        !            90: int    putq();
        !            91: int    noput();
        !            92: struct block   *allocb();
        !            93: struct block   *cramb();
        !            94: struct block   *dupb();
        !            95: struct queue   *backq();
        !            96: struct queue   *allocq();
        !            97: struct inode   *stopen();
        !            98: #endif
        !            99: 
        !           100: /*
        !           101:  * Control messages (regular priority)
        !           102:  */
        !           103: #define        M_DATA  0               /* regular data (not ctl) */
        !           104: #define        M_BREAK 01              /* line break */
        !           105: #define        M_HANGUP 02             /* line disconnect */
        !           106: #define        M_DELIM 03              /* data delimiter */
        !           107: #define        M_ECHO  04              /* request ACK (1 param) */
        !           108: #define        M_ACK   05              /* response to ECHO (1 param) */
        !           109: #define        M_IOCTL 06              /* ioctl; set/get params */
        !           110: #define        M_DELAY 07              /* real-time xmit delay (1 param) */
        !           111: #define        M_CTL   010             /* device-specific control message */
        !           112: #define        M_PASS  011             /* pass file */
        !           113: #define        M_YDEL  012             /* stream has started generating delims */
        !           114: #define        M_NDEL  013             /* stream has stopped generating delims */
        !           115: 
        !           116: /*
        !           117:  * Control messages (high priority; go to head of queue)
        !           118:  */
        !           119: #define        M_SIGNAL 0101           /* generate process signal */
        !           120: #define        M_FLUSH 0102            /* flush your queues */
        !           121: #define        M_STOP  0103            /* stop transmission immediately */
        !           122: #define        M_START 0104            /* restart transmission after stop */
        !           123: #define        M_IOCACK 0105           /* acknowledge ioctl */
        !           124: #define        M_IOCNAK 0106           /* negative ioctl acknowledge */
        !           125: #define        M_PRICTL 0107           /* high priority device-specific ctl */
        !           126: #define        M_IOCWAIT 0110          /* stop ioctl timeout, ack/nak follows later */
        !           127: 
        !           128: #define        setqsched()     mtpr(SIRR, 0x3)
        !           129: 
        !           130: /*
        !           131:  * ioctl message packet
        !           132:  */
        !           133: 
        !           134: #define        STIOCSIZE       16
        !           135: #define        STIOCHDR        4
        !           136: 
        !           137: struct stioctl {
        !           138:        unsigned char com[STIOCHDR];    /* four-byte command, low order byte first */
        !           139:        char data[STIOCSIZE];   /* depends on command */
        !           140: };
        !           141: 
        !           142: #define        stiocom(bp)     (((struct stioctl *)bp->rptr)->com[0]|(((struct stioctl *)bp->rptr)->com[1]<<8))        /* two high bytes ignored for now */
        !           143: #define        stiodata(bp)    (((struct stioctl *)bp->rptr)->data)
        !           144: 
        !           145: /*
        !           146:  * for passing files across streams
        !           147:  */
        !           148: struct kpassfd {
        !           149:        union  {
        !           150:                struct  file *fp;
        !           151:                int     fd;
        !           152:        } f;
        !           153:        short   uid;
        !           154:        short   gid;
        !           155:        short   nice;
        !           156:        char    logname[8];
        !           157: };
        !           158: 
        !           159: /*
        !           160:  * header for messages, see mesg.c
        !           161:  */
        !           162: 
        !           163: struct mesg {
        !           164:        char    type;
        !           165:        u_char  magic;
        !           166:        u_char  losize, hisize;
        !           167: };
        !           168: 
        !           169: #define        MSGMAGIC        0345
        !           170: #define        MSGHLEN 4       /* true length of struct mesg in bytes */

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