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- /*
- ** PIPES.H -- definitions for pipe blocks.
- **
- ** Version:
- ** @(#)pipes.h 8.1 12/31/84
- */
-
- # ifndef PB_DBSIZE
-
- /*
- ** The 'pb_t' (pipe block type) should be arranged so that the
- ** size of the structure excluding pb_xptr is some nice power
- ** of two.
- */
-
- # define PB_DBSIZE 116
- # define PB_IOSIZE 128
-
- typedef struct _pb_t
- {
- char pb_st; /* the state to enter */
- char pb_proc; /* the proc to enter */
- char pb_resp; /* the proc to respond to */
- char pb_padxx; /* --- unused at this time --- */
- char pb_from; /* the immediate writer of this block */
- char pb_type; /* the block type, see below */
- short pb_stat; /* a status word, see below */
- short pb_nused; /* the number of bytes used in this block */
- short pb_nleft; /* the number of bytes left in this block */
- char pb_data[PB_DBSIZE]; /* the data area */
- char *pb_xptr; /* the data pointer (not written) */
- } pb_t;
-
- /* possible values for pb_type */
- # define PB_NOTYPE 0 /* unknown type */
- # define PB_REG 1 /* regular block */
- # define PB_RESP 2 /* response block */
- # define PB_ERR 3 /* error message */
- # define PB_SYNC 4 /* interrupt sync */
- # define PB_RESET 5 /* system reset */
- # define PB_TRACE 6 /* set new trace flags */
- /* more meta definitions go before this line */
-
- /* definitions for pb_stat */
- # define PB_EOF 00001 /* end of file block */
- # define PB_FRFR 00002 /* originated from front end */
- # define PB_INFO 00004 /* info purposes only, no response */
-
- /* definitions for pb_proc */
- # define PB_WILD -2 /* all processes */
- # define PB_UNKNOWN -1 /* unknown */
- # define PB_FRONT 0 /* front end */
- /* other processes are given numbers from 2 */
-
- /* definitions for pb_st */
- /* define PB_UNKNOWN -1 */
- # define PB_NONE 0 /* response block */
-
- # endif PB_DBSIZE
-