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1 nam PipeDefs
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2 ttl OS-9 Pipe Definitions
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3
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4 * OS-9 Pipe Definitions
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5 *
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6 * IOMan equates duplicated for PipeMan use
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7 *
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8
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9 NPATHS set 16 ;Maximum local paths per task -- must match IOMan
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10 NameMax set 29 ;Maximum length of a file name
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11
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12 *
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13 * Device Driver Static Storage Layout
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14 *
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15 org V.User
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16 V.List rmb 2 ;Pointer to 1st pipe's pipe buffer
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17 PManMem equ . ;Device driver memory (drive table equivalent)
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18
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19 *
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20 * Pipe Buffer Data Structure
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21 *
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22 org 0
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23 PP.PD rmb 2 ;Pointer to shared path descriptor
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24 PP.Next rmb 2 ;Pointer to next pipe buffer in system map
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25 PP.Prev rmb 2 ;Pointer to previous pipe buffer in system map
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26 PP.Rsrv rmb 2 ;Reserved
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27 PP.Data equ . ;Data buffer begins at this offset
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28
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29 *
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30 * Unique Path Descriptor Variables
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31 *
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32 org PD.FST
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33 *** PP.Read must have bit 4 clear; PP.Writ must be PP.Read XOR 4
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34 PD.Read equ .
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35 PD.RPID rmb 1 ;Process ID of reader waiting on signal
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36 PD.RCT rmb 1 ;Number of blocked readers
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37 PD.RSIG rmb 1 ;Signal to send reader
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38 PD.REOR rmb 1 ;Read EOR character
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39 PD.Writ equ .
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40 PD.WPID rmb 1 ;Process ID of writer waiting on signal
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41 PD.WCT rmb 1 ;Number of blocked writers
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42 PD.WSIG rmb 1 ;Signal to send writer
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43 PD.WEOR rmb 1 ;Write EOR character (dummy)
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44 *** End of special section
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45 PD.End rmb 2 ;Pointer to end of pipe buffer
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46 PD.NxtI rmb 2 ;Next in pointer
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47 PD.NxtO rmb 2 ;Next out pointer
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48 PD.RFlg rmb 1 ;"Ready" flag
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49 PD.Wrtn rmb 1 ;"Written" flag
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50 PD.BCnt rmb 2 ;# queue elements currently bufered
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51 PD.Own rmb 1 ;Process ID of pipe original creator
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52 PD.Keep rmb 1 ;Non-zero if pipe has been kept open artificailly
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53 PD.QSiz rmb 2 ;Max. elements in queue (copied from OPT section)
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54
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55 *
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56 * Path descriptor option section
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57 *
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58 * Note that PD.Name overlaps with the last byte of PD.ECnt.
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59 * PD.ECnt is copied to PD.QSiz as part of OPEN or CREATE,
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60 * to make room for the pipe name.
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61 *
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62 org (PD.OPT+1)
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63 PD.ESiz rmb 1 ;Size of each queue element
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64 PD.ECnt rmb 2 ;Max. elements in queue (initial position)
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65
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66 *
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67 * Device Descriptor definitions
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68 *
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69 IT.PDC equ $12 ;Pipe device class (like IT.DTP, IT.DVC)
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70 org IT.PDC
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71 rmb 1 ;Leave room for device class
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72 IT.ESiz rmb 1 ;Size of each queue element
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73 IT.ECnt rmb 2 ;Max. elements in queue (initial position)
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74
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75 * End of pipedefs
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76
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