Compuprint 914 Spécifications Page 109
- Page / 374
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
3-13
Spooler Overview
argv[0] is the name of the backend itself, as usual. Note that the –Pasc, which specifies the
queue name, was parsed out of the original argument vector, as were the –C and – N3 flags
and arguments.
piobe uses the argv[] values to construct a pipeline of filters that must be executed to
process the job as requested. After determining the structure of the pipeline, piobe passes
the structure to a shell for realization. If the file parameter in the /etc/qconfig entry for this
queue exists, piobe will open the stdout of the last process in the pipeline onto the value
specified by the file parameter. The last process in the pipeline is not prevented from
re–opening stdout onto some other file or device.
Note the parent–child relationship among these processes, which is not apparent from the
figure:
• qdaemon is the parent of piobe.
• piobe is the parent of the shell.
• The shell is the parent of pioout, the last process in the pipeline before the device driver
is accessed. pioout is called the Interface Program for Use With the Device Driver or the
device driver interface program.
• pioout is the parent of pioformat.
• pioformat dynamically loads and links the device–dependent code at runtime; hence the
device–dependent code does not appear as a process in the operating system’s process
table.
• pioformat is the parent of the optional filter (if it exists), such as the pr filter.
An optional filter, such as pr, can be specified on the command–line (or hard–coded in the
colon file) to perform pre–filtering on the job before pioformat processes it.
pioformat is known as a device–independent formatter driver. It will dynamically load, link,
and drive various device–dependent formatters to process jobs of a specific data stream
type (for example, Postscript, ASCII, GL, or PCL).
Device–dependent code is designed to handle the unique properties of combinations of
specific data streams and physical printers. Because combinations of data stream types and
printers can be grouped into classes with common attributes, there are currently less than
20 device–dependent modules. These modules are loaded, linked, and driven by pioformat
at run time.
pioout is the end of the job–processing pipeline, and is called the device driver interface
program. The function of pioout is to take the processed data stream and deliver it to the
device for which it was intended, generally a printer. In the typical local print queue
environment, it is pioout that has its stdout opened onto the character special file in the
/dev directory, as specified by the file parameter in /etc/qconfig.
This is the character special file in the /dev directory that provides access to the device
driver for the printer hardware.
- 86 A2 58EM 00 1
- ORDER REFERENCE 1
- Software 3
- About This Book 5
- Contents 7
- Chapter 1. Printing Overview 17
- Printing terminology 18
- Printing Overview 19
- Prerequisites 22
- Web–based System Manager 27
- Prerequisite 28
- Print queue status conditions 32
- Command summary for printing 39
- Printing processes 41
- Initial printer configuration 43
- Configuring a printer port 46
- Print queue operations 48
- Adding a print queue device 49
- Creating a plotter setup file 51
- Configuration options 56
- Wiring nonsupported printers 57
- Supported hardware 58
- Printing Administration 59
- Verifying terminal output 61
- Configuring a printer 63
- Terminfo database 65
- 64–port controller 66
- 128–port controller 66
- Printer backend commands 66
- To list print queues: 68
- To list print queue devices: 68
- To start a queue: 70
- To stop a queue: 70
- Scheduling print jobs 74
- Deleting a print queue 76
- Specifying paper size 78
- To list all defined printers: 81
- Deleting printers 84
- Remote printing overview 88
- Controlling the lpd daemon 89
- Listing all remote hosts 93
- Adding a remote host 93
- Deleting a remote host 94
- Chapter 3. Spooler Overview 97
- Spooler Introduction 98
- Spooler Concepts 99
- Spooler Backends 100
- Spooler Job 101
- Spooler Parts 103
- Spooler Overview 105
- /etc/motd 106
- /etc/qconfig File Structure 112
- Programming 115
- Printer Backend Data Flow 116
- Default Flag Value Attributes 119
- Input Data Stream Attributes 121
- Prohibited Flags Attributes 122
- Filter Flag Attributes 123
- Directory Attributes 124
- Miscellaneous Attributes 124
- Work Variable Attributes 125
- Command Aggregate Attributes 126
- ASCII Control Code Attributes 126
- Escape Sequences Attributes 127
- Colon File Format 135
- Attribute Names 136
- Reserved Attribute Names 137
- Suggested Attribute Names 137
- Attribute Values 138
- Limits Field 138
- Validation Information 139
- Example of Print Formatter 140
- Using the Status File 143
- Printing Extra Copies 143
- Charging for the Job 144
- Using Exit Codes 144
- Returning Error Messages 145
- Message Format 146
- Setting Queue States 147
- Stage–1 Translation 151
- Stage–2 Translation 151
- Translation Table Example 155
- Printer Attachment Files 156
- Structure of Attachment Files 157
- Contents of the limits Field 160
- aix_values 0,1,2 161
- Display Operators 162
- :100:_L:E#:60 163
- :100:_L:Qy:60 163
- Procedure 167
- Printer–Specific Information 169
- 2381–2,2390–2, 2391–2 170
- IBM 3812 Model 2 Page Printer 170
- IBM 3816 Page Printer 171
- IBM 4072 ExecJet 172
- IBM 4076 InkJet Printer 172
- IBM 4216–510 and IBM 5327–011 173
- IBM 4234 Printer 173
- IBM Network Color Printer 175
- IBM InfoPrint 20 179
- IBM InfoPrint 32 Printer 182
- IBM InfoPrint 40 Printer 185
- Lexmark 4227 Forms Printer 191
- Lexmark Optra Laser Printer 192
- Lexmark Optra K 1220 Printer 205
- Lexmark Optra E LaserPrinter 211
- Lexmark Optra N LaserPrinter 214
- Printronix P9012 Line Printer 240
- Printer Support 241
- Pass–Through Mode 247
- Custom Header Pages 260
- qprt –Pasc –fp /etc/motd 264
- Editing the /etc/qconfig File 267
- Local Printer Checklist 270
- Inoperative Printer Checklist 271
- Remote Printer Checklist 272
- Adapter Considerations 273
- Resource Considerations 273
- Reactivating the Queue Daemon 275
- Queuing System Problems 283
- Testing the qdaemon 284
- Testing a Spooler Queue 286
- Copying Spooled Jobs 287
- Cleaning Up and Starting Over 288
- Related Information 288
- Print Request Log 292
- Print Service Command Line 293
- Configuring Banners 296
- Printer Models File 297
- Printer Interface Scripts 298
- Using the terminfo Database 301
- Creating a Printer Form 303
- Removing a Form 304
- Mounting a Form 305
- Unmounting a Form 306
- Examining a Form 306
- Providing Filters 307
- Defining a Filter 309
- Removing a Filter 315
- Examining a Filter 315
- Printer Types 316
- Content Types 316
- Common Types 317
- Commonly Used Content Types 317
- Default Content Type 318
- PostScript Printers 319
- %%Page: label ordinal 320
- PostScript Page Order Table 321
- PostScript Filters 322
- Special Purpose Filters 322
- Specifying Character Sets 326
- Default Port Characteristics 330
- PrintBindDN ] [–U] 335
- Server Flag Options 336
- Client–Side Options 337
- Examples 337
- Files Accessed 338
- Transparent Printing 339
- Hardware Requirements 343
- Setting Up the Hardware 343
- Adding the Print Queue 344
- Testing the Printer 344
- Colon File Escape Sequences 345
- NOM / NAME : Date : 369
- SOCIETE / COMPANY : 369
- ADRESSE / ADDRESS : 369
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