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Annotation of 42BSD/ingres/source/ctlmod/pipes.h, revision 1.1.1.1

1.1       root        1: /*
                      2: **  PIPES.H -- definitions for pipe blocks.
                      3: **
                      4: **     Version:
                      5: **             @(#)pipes.h     7.1     2/5/81
                      6: */
                      7: 
                      8: # ifndef PB_DBSIZE
                      9: 
                     10: /*
                     11: **  The 'pb_t' (pipe block type) should be arranged so that the
                     12: **  size of the structure excluding pb_xptr is some nice power
                     13: **  of two.
                     14: */
                     15: 
                     16: # define       PB_DBSIZE       116
                     17: # define       PB_IOSIZE       128
                     18: 
                     19: typedef struct _pb_t
                     20: {
                     21:        char    pb_st;          /* the state to enter */
                     22:        char    pb_proc;        /* the proc to enter */
                     23:        char    pb_resp;        /* the proc to respond to */
                     24:        char    pb_padxx;       /* --- unused at this time --- */
                     25:        char    pb_from;        /* the immediate writer of this block */
                     26:        char    pb_type;        /* the block type, see below */
                     27:        short   pb_stat;        /* a status word, see below */
                     28:        short   pb_nused;       /* the number of bytes used in this block */
                     29:        short   pb_nleft;       /* the number of bytes left in this block */
                     30:        char    pb_data[PB_DBSIZE];     /* the data area */
                     31:        char    *pb_xptr;       /* the data pointer (not written) */
                     32: }  pb_t;
                     33: 
                     34: /* possible values for pb_type */
                     35: # define       PB_NOTYPE       0       /* unknown type */
                     36: # define       PB_REG          1       /* regular block */
                     37: # define       PB_RESP         2       /* response block */
                     38: # define       PB_ERR          3       /* error message */
                     39: # define       PB_SYNC         4       /* interrupt sync */
                     40: # define       PB_RESET        5       /* system reset */
                     41: # define       PB_TRACE        6       /* set new trace flags */
                     42: /* more meta definitions go before this line */
                     43: 
                     44: /* definitions for pb_stat */
                     45: # define       PB_EOF          00001   /* end of file block */
                     46: # define       PB_FRFR         00002   /* originated from front end */
                     47: # define       PB_INFO         00004   /* info purposes only, no response */
                     48: 
                     49: /* definitions for pb_proc */
                     50: # define       PB_WILD         -2      /* all processes */
                     51: # define       PB_UNKNOWN      -1      /* unknown */
                     52: # define       PB_FRONT        0       /* front end */
                     53: /* other processes are given numbers from 2 */
                     54: 
                     55: /* definitions for pb_st */
                     56: /* define      PB_UNKNOWN      -1      */
                     57: # define       PB_NONE         0       /* response block */
                     58: 
                     59: # endif PB_DBSIZE

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