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0_CONTS.A
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Contents
_ ________________________________________________________________
1 System Calls 1
1.1 Introduction 3
1.2 Standard Character Device I/O 4
1.3 Memory Management 5
1.4 Process Management 7
1.5 File and Directory Management 9
1.6 Microsoft Networks 14
1.7 National Language Support 15
1.8 Miscellaneous System-Management Functions 16
1.9 Old System Calls 17
1.10 Using the System Calls 21
1.11 Interrupts 35
1.12 Function Requests 53
2 MS-DOS Device Drivers 323
2.1 Introduction 325
2.2 Format of a Device Driver 326
2.3 How to Create a Device Driver 328
2.4 Installing Device Drivers 329
2.5 Device Headers 330
2.6 Request Header 334
2.7 Device Driver Functions 337
2.8 The Media Descriptor Byte 351
2.9 Format of a Media Descriptor Table 351
2.10 The CLOCK Device 353
2.11 Anatomy of a Device Call 354
2.12 Two Sample Device Drivers 355
3 MS-DOS Technical Information 383
3.1 Introduction 385
3.2 MS-DOS Initialization 385
3.3 The Command Processor 386
3.4 MS-DOS Disk Allocation 387
3.5 MS-DOS Disk Directory 387
3.6 File Allocation Table (FAT) 390
3.7 MS-DOS Standard Disk Formats 392
4 MS-DOS Control Blocks
and Work Areas 395
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Contents
4.1 Introduction 397
4.2 Typical Contents of an MS-DOS Memory Map 397
4.3 MS-DOS Program Segment 398
5 National Language Support 403
5.1 Introduction 405
5.2 National Language Support Calls 405
5.3 Font Files 406
6 .Exe File Structure and Loading 411
6.1 Format of a File Header 413
6.2 The Relocation Table 414
7 Microsoft Relocatable
Object Module Formats 417
7.1 Introduction 419
7.2 Module Identification and Attributes 423
7.3 Conceptual Framework for Fixups 425
7.4 Record Sequence 431
7.5 Introducing the Record Formats 433
7.6 Microsoft Type Representations
for Communal Variables 460
8 Programming Hints 463
8.1 Introduction 465
8.2 Interrupts 465
8.3 System Calls 466
8.4 Device Management 467
8.5 Memory Management 468
8.6 Process Management 468
8.7 File and Directory Management 469
8.8 Miscellaneous 471
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Figures
_ ________________________________________________________________
Figure 1.1 Example of the 8088 Registers 25
Figure 1.2 Sample Program with Common Skeleton 26
Figure 2.1 Sample Device Header 330
Figure 2.2 Attribute Word for Character Devices 333
Figure 2.3 Attribute Word for Block Devices 333
Figure 2.4 Request Header 335
Figure 2.5 Format of a Boot Sector 352
Figure 2.6 Format of a Clock Device 354
Figure 4.1 Program Segment Prefix 402
Figure 5.1 Font File Structure 407
Figure 7.1 Location Types 427
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Tables
_ ________________________________________________________________
Table 1.1 Standard Character I/O Function Requests 4
Table 1.2 Memory Management Function Requests 5
Table 1.3 Process-Management Function Requests 7
Table 1.4 Predefined Device Handles 9
Table 1.5 File-Related Function Requests 10
Table 1.6 File-Sharing Function Requests 11
Table 1.7 Device-Related Function Requests 12
Table 1.8 Directory-Related Function Requests 12
Table 1.9 File Attributes 13
Table 1.10 Microsoft Networks Function Requests 14
Table 1.11 National Language-Support Function Requests 15
Table 1.12 Miscellaneous System-Management Function Requests 16
Table 1.13 Old System Calls and Their Replacements 17
Table 1.14 Format of the File Control Block (FCB) 18
Table 1.15 Error Codes Returned in AX 22
Table 1.16 MS-DOS Interrupts, Numeric Order 27
Table 1.17 MS-DOS Interrupts, Alphabetic Order 27
Table 1.18 MS-DOS Function Requests, Numeric Order 28
Table 1.19 MS-DOS Function Requests, Alphabetic Order 31
Table 1.20 Bit values for Function 29H 133
Table 1.21 Sharing Mode Bit Values 174
Table 1.22 Access Code Bit Values 175
Table 1.23 MS-DOS Data Bit Values 193
Table 1.24 Contents of the Parameter Block 239
Table 1.25 Contents of the Parameter Block 243
Table 1.26 250
Table 1.27 Allocation Strategy 263
Table 2.1 For Character Devices: 331
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Contents
Table 2.2 For Block Devices: 331
Table 3.1 MS-DOS Standard Removable-Disk Formats 393
Table 3.2 MS-DOS Standard Removable Disk Formats (High-Density) 393
Table 7.1 Object Module Record Formats 419
Table 7.2 Combination Attribute Example 438
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