............................Figures


Figure 2-1 Simple Stream	7
Figure 2-2 STREAMS-based Pipe	8
Figure 2-3 Stream to Communications Driver	11
Figure 2-4 Queue Pair Allocation	12
Figure 2-5 A Message	14
Figure 2-6 Messages on a Message Queue	15
Figure 2-7 A Stream in More Detail	17
Figure 2-8 Many-to-one Multiplexer	19
Figure 2-9 One-to-many Multiplexer	19
Figure 2-10 Many-to-many Multiplexer	20
Figure 2-11 Internet Multiplexing Stream	21
Figure 2-12 X.25 Multiplexing Stream	22
Figure 2-13 Protocol Module Portability	25
Figure 2-14 Protocol Migration	26
Figure 2-15 Module Reusability	27
Figure 3-1 Upstream and Downstream Stream Construction	31


Figure 3-2 Stream Queue Relationship	32
Figure 3-3 Case Converter Module	38
Figure 4-1 Idle Stream Configuration Example	48
Figure 4-2 Operational Stream for Example	49
Figure 4-3 Module Put and Service Procedures	50
Figure 5-1 Message Form and Linkage	58
Figure 5-2 Message Ordering in a Queue	66
Figure 5-3 Message Ordering with One Priority Band	67
Figure 5-4 Data Structure Linkage	74
Figure 5-5 Flow Control	77
Figure 5-6 Protocol Substitution	84
Figure 5-7 Service Interface	85
Figure 5-8 Receiving Data	93
Figure 7-1 Flushing The Write-Side of A Stream	153
Figure 7-2 Flushing The Read-Side of A Stream	154
Figure 7-3 Interfaces Affecting Drivers	157
Figure 9-1 Device Driver Streams	186
Figure 9-2 Loop-Around Streams	199
Figure 10-1 MultiplexerProtocol Multiplexer	213
Figure 10-2 Before Link	214
Figure 10-3 IP Multiplexer After First Link	216
Figure 10-4 IP Multiplexer	217
Figure 10-5 TP Multiplexer	219
Figure 10-6 Internet Multiplexer Before Connecting	226
Figure 10-7 Internet Multiplexer After Connecting	227


Figure 10-8 open() of MUXdriver and Driver1	240
Figure 10-9 Multiplexer After I_PLINK	241
Figure 10-10 Other Users Opening a MUXdriver	242
Figure 11-1 Pushing Modules on a STREAMS-based Pipe	247
Figure 11-2 Server Sets Up a Pipe	255
Figure 11-3 Processes X and Y Open /usr/toserv	256
Figure 12-1 STREAMS-based Terminal Subsystem	260
Figure 12-2 Pseudo-TTY Subsystem Architecture	272
Figure 13-1 Inner perimeter spanning a pair of queues. (D_MPTQAIR)	290
Figure 13-2 Inner perimeter spanning all queues in a module. (D_MTPERMOD)	291
Figure 13-3 Outer perimeter spanning all queues in a module with inner perimeters spanning each pair of queues. (D_MTOUTPERIM combined with D_MTQPAIR)	292
Figure B-1 `M_PROTO` and M_PCPROTO Message Structure	335
Figure D-1 Error and Trace Logging	378