启动时：mounting NFS filesystems 时间过长的问题

mtwaterc 2002-09-08 11:06:29
red hat 7.2，每次启动时，到mounting NFS filesystems 时，要停10分钟左右，在启动服务中，把NFS和NFS LOCKED去掉，问题依然存在，请问该如何解决？3X
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linuxnewer 2002-09-09
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查看一下fstab中是否有关于nfs的mount？
mistl 2002-09-09
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你配了相应的设置没有。
如果你不用NFS，不如不让它启动。
Solaris 10 System Administration Essentials
目录 Chapter 1 Installing the Solaris 10 Operating System 1 1.1 Methods to Meet Your Needs 1 1.2 The Basics of Solaris Installation 2 1.2.1 Installing Solaris on a SPARC System 6 1.2.2 Installing Solaris on an x86 System 9 1.3 Solaris JumpStart Installation 13 1.3.1 Setting up a JumpStart Server 13 1.3.2 Creating a Pro?le Server for Networked Systems 14 1.3.3 Performing a Custom JumpStart Installation 22 1.4 Upgrading a Solaris System 25 1.5 Solaris Live Upgrade 26 Chapter 2 Boot, Service Management, and Shutdown 33 2.1 Boot 33 2.1.1 The Bootloader 33 2.1.2 The Kernel 34 2.1.3 User-Mode Programs 34 2.1.4 GRUB Extensions 35 2.1.5 Modifying Boot Behavior 36 2.1.6 Run Levels 37 2.1.7 Troubleshooting 37 2.2 Service Management Facility 39 2.2.1 enabled 40 2.2.2 state, next_state, and state_time 40 2.2.3 logfile 41 2.2.4 dependency 41 2.2.5 How SMF Interacts with Service Implementations 42 2.2.6 The Service Con?guration Facility 44 2.2.7 Health and Troubleshooting 44 2.2.8 Service Manifests 45 2.2.9 Backup and Restore of SCF Data 45 2.3 Shutdown 46 2.3.1 Application-Speci?c Shutdown 46 2.3.2 Application-Independent Shutdown 46 Chapter 3 Software Management: Packages 47 3.1 Managing Software Packages 47 3.2 What Is a Package? 47 3.2.1 SVR4 Package Content 48 3.2.2 Package Naming Conventions 49 3.3 Tools for Managing Software Packages 49 3.4 Installing or Removing a Software Package with the pkgadd or pkgrm Command 50 3.5 Using Package Commands to Manage Software Packages 51 3.5.1 How to Install Packages with the pkgadd Command 51 3.5.2 Adding Frequently Installed Packages to a Spool Directory 54 3.5.3 Removing Software Packages 56 Chapter 4 Software Management: Patches 59 4.1 Managing Software with Patches 59 4.2 What Is a Patch? 59 4.2.1 Patch Content 60 4.2.2 Patch Numbering 61 4.3 Patch Management Best Practices 61 4.3.1 Proactive Patch Management Strategy 62 4.3.2 Reactive Patch Management Strategy 68 4.3.3 Security Patch Management Strategy 70 4.3.4 Proactive Patching When Installing a New System 71 4.3.5 Identifying Patches for Proactive Patching and Accessing Patches 73 4.4 Example of Using Solaris Live Upgrade to Install Patches 75 4.4.1 Overview of Patching with Solaris Live Upgrade 75 4.4.2 Planning for Using Solaris Live Upgrade 77 4.4.3 How to Apply a Patch When Using Solaris Live Upgrade for the Solaris 10 8/07 Release 79 4.5 Patch Automation Tools 86 4.6 Overview of Patch Types 88 4.7 Patch README Special Instructions 93 4.7.1 When to Patch in Single-User Mode 93 4.7.2 When to Reboot After Applying or Removing a Patch 94 4.7.3 Patch Metadata for Non-Global Zones 95 4.8 Patch Dependencies (Interrelationships) 96 4.8.1 SUNW_REQUIRES Field for Patch Dependencies 96 4.8.2 SUNW_OBSOLETES Field for Patch Accumulation and Obsolescence 97 4.8.3 SUNW_INCOMPAT Field for Incompatibility 97 Chapter 5 Solaris File Systems 99 5.1 Solaris File System Overview 99 5.1.1 Mounting File Systems 100 5.1.2 Unmounting File Systems 102 5.1.3 Using the /etc/vfstab File 103 5.1.4 Determining a File System Type 104 5.1.5 Monitoring File Systems 105 5.2 UFS File Systems 105 5.2.1 Creating a UFS File System 106 5.2.2 Backing Up and Restoring UFS File Systems 107 5.2.3 Using Quotas to Manage Disk Space 108 5.2.4 Checking File System Integrity 110 5.2.5 Using Access Control Lists 112 5.2.6 Using UFS Logging 113 5.2.7 Using Extended File Attributes 115 5.2.8 Using Multiterabyte UFS File Systems 115 5.2.9 Creating UFS Snapshots 115 5.3 ZFS File System Administration 117 5.3.1 Using Pools and File Systems 118 5.3.2 Backing Up a ZFS File System 120 5.3.3 Using Mirroring and Striping 121 5.3.4 Using RAID-Z 122 5.3.5 Using Copy-on-Write and Snapshots 122 5.3.6 Using File Compression 124 5.3.7 Measuring Performance 124 5.3.8 Expanding a Pool 125 5.3.9 Checking a Pool 126 5.3.10 Replacing a Disk 127 5.4 NFS File System Administration 127 5.4.1 Finding Available NFS File Systems 128 5.4.2 Mounting an NFS File System 129 5.4.3 Unmounting an NFS File System 129 5.4.4 Con?guring Automatic File System Sharing 130 5.4.5 Automounting File Systems 130 5.5 Removable Media 133 5.5.1 Using the PCFS File System 135 5.5.2 Using the HSFS File System 136 5.6 Pseudo File System Administration 136 5.6.1 Using Swap Space 136 5.6.2 Using the TMPFS File System 138 5.6.3 Using the Loopback File System 139 Chapter 6 Managing System Processes 141 6.1 Overview 141 6.1.1 State of a Process 143 6.1.2 Process Context 143 6.2 Monitoring the Processes 145 6.2.1 Process Status: ps 146 6.2.2 Grepping for Process: pgrep 149 6.2.3 Process Statistics Summary: prstat 149 6.2.4 Reap a Zombie Process: preap 151 6.2.5 Temporarily Stop a Process: pstop 152 6.2.6 Resuming a Suspended Process: prun 152 6.2.7 Wait for Process Completion: pwait 152 6.2.8 Process Working Directory: pwdx 152 6.2.9 Process Arguments: pargs 152 6.2.10 Process File Table: pfiles 153 6.2.11 Process Libraries: pldd 154 6.2.12 Process Tree: ptree 154 6.2.13 Process Stack: pstack 155 6.2.14 Tracing Process: truss 156 6.3 Controlling the Processes 158 6.3.1 The nice and renice Commands 158 6.3.2 Signals 159 6.4 Process Manager 164 6.5 Scheduling Processes 170 6.5.1 cron Utility 171 6.5.2 The at Command 175 Chapter 7 Fault Management 179 7.1 Overview 179 7.2 Fault Noti?cation 181 7.3 Displaying Faults 182 7.4 Repairing Faults 184 7.5 Managing Fault Management Log Files 184 7.5.1 Automatic Log Rotation 185 7.5.2 Manual Log Rotation 186 7.5.3 Log Rotation Failures 187 7.5.4 Examining Historical Log Files 188 7.6 Managing fmd and fmd Modules 188 7.6.1 Loading and Unloading Modules 189 7.6.2 fmd Statistics 191 7.6.3 Con?guration Files 192 7.7 Fault Management Directories 193 7.8 Solaris Fault Management Downloadable Resources 193 7.8.1 Solaris FMA Demo Kit 193 7.8.2 Events Registry 194 Chapter 8 Managing Disks 197 8.1 Hard Disk Drive 197 8.2 Disk Terminology 199 8.3 Disk Device Naming Conventions 200 8.3.1 Specifying the Disk Subdirectory in Commands 202 8.4 Overview of Disk Management 202 8.4.1 Device Driver 202 8.4.2 Disk Labels (VTOC or EFI) 203 8.4.3 Disk Slices 205 8.4.4 Slice Arrangements on Multiple Disks 207 8.4.5 Partition Table 208 8.4.6 format Utility 210 8.4.7 format Menu and Command Descriptions 211 8.4.8 Partition Menu 213 8.4.9 x86: fdisk Menu 214 8.4.10 Analyze Menu 215 8.4.11 Defect Menu 217 8.5 Disk Management Procedures 217 8.5.1 How to Identify the Disks on a System 218 8.5.2 How to Determine If a Disk Is Formatted 218 8.5.3 How to Format a Disk 219 8.5.4 How to Identify a Defective Sector by Performing a Surface Analysis 221 8.5.5 How to Repair a Defective Sector 222 8.5.6 How to Display the Partition Table or Slice Information 223 8.5.7 Creating Disk Slices (Partitioning a Disk) and Labeling a Disk 224 8.5.8 Creating a File System On a Disk 228 8.5.9 Additional Commands to Manage Disks 229 Chapter 9 Managing Devices 235 9.1 Solaris Device Driver Introduction 235 9.2 Analyzing Lack of Device Support 236 9.2.1 Device Does Not Work 236 9.2.2 Obtaining Information About Devices 236 9.2.3 Obtaining Information About Drivers 241 9.2.4 Does the Device Have a Driver? 248 9.2.5 Current Driver Does Not Work 250 9.2.6 Can a Driver for a Similar Device Work? 250 9.3 Installing and Updating Drivers 251 9.3.1 Backing Up Current Functioning Driver Binaries 251 9.3.2 Package Installations 252 9.3.3 Install Time Updates 252 9.3.4 Manual Driver Binary Installation 253 9.3.5 Adding a Device Driver to a Net Installation Image 256 9.3.6 Adding a Device Driver to a CD/DVD Installation Image 262 9.3.7 Swapping Disks 263 9.4 When Drivers Hang or Panic the System 266 9.4.1 Device Driver Causes the System to Hang 266 9.4.2 Device Driver Causes the System to Panic 268 9.4.3 Device Driver Degrades System Performance 269 9.5 Driver Administration Commands and Files 270 9.5.1 Driver Administration Command Summary 270 9.5.2 Driver Administration File Summary 272 Chapter 10 Solaris Networking 275 10.1 Introduction to Network Con?guration 275 10.1.1 Overview of the TCP/IP Networking Stack 275 10.1.2 Con?guring the Network as Superuser 277 10.2 Setting Up a Network 277 10.2.1 Components of the XYZ, Inc. Network 277 10.2.2 Con?guring the Sales Domain 280 10.2.3 Con?guring the Accounting Domain 283 10.2.4 Con?guring the Multihomed Host 288 10.2.5 Setting Up a System for Static Routing 296 10.2.6 Con?guring the Corporate Domain 300 10.2.7 Testing the Network Con?guration 302 10.3 Monitoring Network Performance 304 10.3.1 dladm Command 304 10.3.2 ifconfig Command 305 10.3.3 netstat Command 305 10.3.4 snoop Command 307 10.3.5 traceroute Command 308 Chapter 11 Solaris User Management 309 11.1 Solaris Users, Groups, and Roles 309 11.1.1 File System Object Permissions 310 11.1.2 User Account Components 312 11.1.3 User Management Tools 313 11.1.4 User Management Files 313 11.2 Managing Users and Groups 314 11.2.1 Starting the Solaris Management Console 314 11.2.2 Adding a Group and a User to Local Files 315 11.2.3 Adding a Group and a User to an NIS Domain 317 11.3 Managing Roles 318 11.3.1 Changing root from a User to a Role 318 11.3.2 Viewing the List of Roles 319 11.3.3 Assigning a Role to a Local User 319 Chapter 12 Solaris Zones 321 12.1 Overview 321 12.2 How Zones Work 323 12.3 Branded Zones 324 12.4 Network Interfaces in Zones 324 12.5 Devices in Zones 325 12.6 Packages and Patches in a Zones Environment 325 12.7 Administering Zones 326 12.7.1 Zone Con?guration 327 12.7.2 Viewing a Zone Con?guration 331 12.7.3 Zone Installation and Booting 331 12.7.4 Zone Login Using the zlogin Command 332 12.8 Halting, Uninstalling, Moving, and Cloning Zones 333 12.9 Migrating a Zone to a New System 334 12.10 Deleting a Zone 336 12.11 Listing the Zones on a System 336 12.12 Zones Usage Examples 337 12.12.1 Adding a Dedicated Device to a Non-Global Zone 337 12.12.2 How to Export Home Directories in the Global Zone into a Non-Global Zone 337 12.12.3 Altering Privileges in a Non-Global Zone 337 12.12.4 Checking the Status of SMF Services 338 12.12.5 Modifying CPU, Swap, and Locked Memory Caps in Zones 338 12.12.6 Using the Dtrace Program in a Non-Global Zone 339 Chapter 13 Using Naming Services 341 13.1 Using Naming Services (DNS, NIS, AND LDAP) 341 13.1.1 Naming Service Cache Daemon (nscd) 342 13.1.2 DNS Naming Services 342 13.1.3 NIS Naming Services 342 13.1.4 LDAP Naming Services 343 13.1.5 Organizational Use of Naming Services 343 13.1.6 Network Database Sources 344 13.2 Name Service Switch File 347 13.2.1 Con?guring the Name Service Switch File 347 13.2.2 Database Status and Actions 349 13.3 DNS Setup and Con?guration 350 13.3.1 Resolver Files 350 13.3.2 Steps DNS Clients Use to Resolve Names 350 13.4 NIS Setup and Con?guration 351 13.4.1 Setting Up NIS Clients 351 13.4.2 Working with NIS Maps 352 13.5 LDAP Setup and Con?guration 356 13.5.1 Initializing a Client Using Per-User Credentials 357 13.5.2 Con?guring an LDAP Client 359 13.5.3 Using Pro?les to Initialize an LDAP Client 362 13.5.4 Using Proxy Credentials to Initialize an LDAP Client 362 13.5.5 Initializing an LDAP Client Manually 363 13.5.6 Modifying a Manual LDAP Client Con?guration 363 13.5.7 Troubleshooting LDAP Client Con?guration 364 13.5.8 Uninitializing an LDAP Client 364 13.5.9 Initializing the Native LDAP Client 364 13.5.10 LDAP API Entry Listings 368 13.5.11 Troubleshooting Name Service Information 368 Chapter 14 Solaris Print Administration 369 14.1 Overview of the Solaris Printing Architecture 369 14.2 Key Concepts 370 14.2.1 Printer Categories (Local and Remote Printers) 370 14.2.2 Printer Connections (Directly Attached and Network Attached) 370 14.2.3 Description of a Print Server and a Print Client 371 14.3 Solaris Printing Tools and Services 371 14.3.1 Solaris Print Manager 371 14.3.2 LP Print Service 371 14.3.3 PostScript Printer De?nitions File Manager 372 14.4 Network Protocols 372 14.4.1 Berkeley Software Distribution Protocol 372 14.4.2 Transmission Control Protocol 372 14.4.3 Internet Printing Protocol 373 14.4.4 Server Message Block Protocol 373 14. 5 Planning for Printer Setup 373 14. 5.1 Print Server Requirements 373 14. 5.2 Locating Information About Supported Printers 374 14. 5.3 Locating Information About Available PPD Files 375 14. 5.4 Adding a New PPD File to the System 375 14. 5.5 Adding Printers in a Naming Service 377 14. 5.6 Printer Support in the Naming Service Switch 377 14. 5.7 Enabling Network Listening Services 378 14.6 Setting Up Printers with Solaris Printer Manager 379 14.6.1 Assigning Printer De?nitions 379 14.6.2 Starting Solaris Print Manager 380 14.6.3 Setting Up a New Directly Attached Printer With Solaris Print Manager 381 14.6.4 Setting Up a New Network-Attached Printer with Solaris Print Manager 381 14.7 Setting Up a Printer on a Print Client with Solaris Print Manager 385 14.7.1 Adding Printer Access With Solaris Print Manager 385 14.8 Administering Printers by Using LP Print Commands 385 14.8.1 Frequently Used LP Print Commands 386 14.8.2 Using the lpstat Command 386 14.8.3 Disabling and Enabling Printers 387 14.8.4 Accepting or Rejecting Print Requests 387 14.8.5 Canceling a Print Request 388 14.8.6 Moving Print Requests from One Printer to Another Printer 389 14.8.7 Deleting a Printer 390 14.9 Troubleshooting Printing Problems 392 14.9.1 Troubleshooting No Output (Nothing Prints) 392 14.9.2 Checking That the Print Scheduler Is Running 393 14.9.3 Debugging Printing Problems 393 14.9.4 Checking the Printer Network Connections 394 Index 395
vxworks_kernel_programmers_guide_6.9
PART I: CORE TECHNOLOGIES 1 Overview ...................................................................................................... 3 1.1 Introduction ...................................................................................................................... 3 1.2 Kernel Architecture ......................................................................................................... 3 1.3 Related Documentation Resources .............................................................................. 4 1.4 VxWorks Configuration and Build .............................................................................. 5 2 VxWorks Configuration ............................................................................. 7 2.1 Introduction ...................................................................................................................... 7 2.2 About VxWorks Configuration ................................................................................... 7 2.2.1 Default Configuration and Images ................................................................. 8 2.2.2 Configuration With VxWorks Image Projects ............................................... 8 2.2.3 Configuration With VxWorks Source Build Projects ................................... 8 2.2.4 Configuration and Customization .................................................................. 8 2.2.5 Configuration Tools: Workbench and vxprj .................................................. 9 2.3 VxWorks Image Projects: VIPs .................................................................................... 9 2.3.1 VxWorks Components ...................................................................................... 10 Component Names .......................................................................................... 10 Basic VxWorks Components ............................................................................ 11 2.3.2 Device Driver Selection ................................................................................... 13 2.3.3 Component Bundles and Configuration Profiles ........................................ 14 2.3.4 VxWorks Component Reference .................................................................... 14 2.4 VxWorks Source Build Projects: VSBs ....................................................................... 14 2.4.1 Basic Operating System VSB Options ........................................................... 16 BSP-Specific Optimizations ............................................................................. 16 VxWorks Kernel Programmer's Guide, 6.9 iv Inconsistent Cache Mode Support .................................................................. 17 System Viewer Instrumentation Support ...................................................... 17 Real-Time Process Support .............................................................................. 17 Object Management Support ........................................................................... 17 Error Detection and Reporting Policy Hooks ............................................... 18 Task Switch Hook Support .............................................................................. 18 Task Create Hook Support ............................................................................... 18 CPU Power Management Support ................................................................. 19 Advanced Options ............................................................................................ 19 VxWorks BSP Validation Test Suite Support ................................................. 19 Symmetric Multiprocessor (SMP) Support ................................................... 19 SMP Determinism ............................................................................................. 19 MIPC Support .................................................................................................... 20 WRLOAD Support ............................................................................................ 20 Task-Specific Current Working Directory ...................................................... 20 Device Name Length ........................................................................................ 20 NFS V3 Server Optimization ........................................................................... 20 DOSFS Name Length Compatible .................................................................. 21 2.4.2 VSB Profiles ........................................................................................................ 21 2.4.3 Using VSB Projects to Create VxWorks Systems: Basic Steps .................... 21 2.4.4 Developing Kernel Applications for VSB Systems ..................................... 21 2.5 VxWorks Without Networking ..................................................................................... 22 2.6 Small-Footprint VxWorks Configuration ................................................................... 22 2.6.1 About Small-Footprint VxWorks .................................................................... 22 Kernel Facilities ................................................................................................. 22 Unsupported Facilities ..................................................................................... 23 BSPs ..................................................................................................................... 23 2.6.2 Configuring Small Footprint VxWorks .......................................................... 23 Small-Footprint VSB Profile and Options ...................................................... 24 VSB Options Specific to the Small-Footprint Profile .................................... 24 Small-Footprint VIP Profile and Components .............................................. 25 Optional Components for a Small Footprint VIP Project ............................ 25 2.6.3 Configuration and Build Steps for Small-Footprint VxWorks ................... 25 2.6.4 Writing Applications for Small-Footprint VxWorks .................................... 26 2.6.5 Example Application ........................................................................................ 26 2.6.6 Debugging Small-Footprint VxWorks ............................................................ 28 2.7 VxWorks Image Types ................................................................................................... 28 2.7.1 Default VxWorks Images ................................................................................ 29 2.7.2 VxWorks Images for Development and Production Systems ..................... 29 2.7.3 Boot Parameter Configuration for Standalone VxWorks Images .............. 30 2.8 Image Size Considerations ............................................................................................ 30 2.8.1 Boot Loader and Downloadable Image ......................................................... 30 2.8.2 Self-Booting Image ............................................................................................ 31 Contents v 3 Boot Loader ................................................................................................. 33 3.1 Introduction ...................................................................................................................... 33 3.2 Using a Default Boot Loader ......................................................................................... 34 3.3 Boot Loader Image Types ............................................................................................... 35 3.4 Boot Loader Shell ............................................................................................................ 35 3.4.1 Boot Loader Shell Commands ......................................................................... 36 3.5 Boot Parameters ............................................................................................................... 39 3.5.1 Displaying Current Boot Parameters ............................................................. 40 3.5.2 Description of Boot Parameters ...................................................................... 41 3.5.3 Changing Boot Parameters Interactively ....................................................... 44 3.6 Rebooting VxWorks ........................................................................................................ 45 3.7 Configuring and Building Boot Loaders .................................................................... 46 3.7.1 Boot Loader Profiles .......................................................................................... 46 3.7.2 Boot Loader Components ................................................................................ 47 3.7.3 Configuring Boot Parameters Statically ......................................................... 47 3.7.4 Enabling Networking for Non-Boot Interfaces ............................................. 48 3.7.5 Selecting a Boot Device ..................................................................................... 48 3.7.6 Reconfiguring Boot Loader Memory Layout for 32-Bit VxWorks ............. 50 Redefining the Boot Loader Link Address for Custom Boot Loaders ....... 50 Reconfiguring Memory Layout for a Persistent Memory Region ............. 51 3.7.7 Reconfiguring Boot Loader Memory Layout for 64-Bit VxWorks ............. 53 3.7.8 Building Boot Loaders ...................................................................................... 53 3.8 Installing Boot Loaders .................................................................................................. 53 3.9 Booting From a Network ............................................................................................... 53 3.10 Booting From a Target File System ............................................................................. 55 3.11 Booting From the Host File System Using TSFS ..................................................... 55 4 Kernel Applications .................................................................................... 57 4.1 Introduction ...................................................................................................................... 57 4.2 About Kernel Applications ........................................................................................... 58 4.3 Comparing Kernel Applications with RTP Applications ....................................... 59 4.4 C and C++ Libraries ........................................................................................................ 60 VxWorks Kernel Programmer's Guide, 6.9 vi 4.5 Kernel Application Structure ........................................................................................ 60 4.6 VxWorks Header Files .................................................................................................... 61 4.6.1 VxWorks Header File: vxWorks.h ................................................................... 61 4.6.2 Other VxWorks Header Files ........................................................................... 62 4.6.3 ANSI Header Files ............................................................................................ 62 4.6.4 ANSI C++ Header Files .................................................................................... 62 4.6.5 The -I Compiler Flag ......................................................................................... 62 4.6.6 VxWorks Nested Header Files ........................................................................ 62 4.6.7 VxWorks Private Header Files ........................................................................ 63 4.7 Custom Header Files ....................................................................................................... 63 4.8 Static Instantiation of Kernel Objects ......................................................................... 64 4.8.1 About Static Instantiation of Kernel Objects ................................................. 64 Kernel Objects That can be Instantiated Statically ....................................... 65 Static Instantiation and Code Size .................................................................. 65 Advantages of Static Instantiation .................................................................. 65 Applications and Static Instantiation ............................................................. 66 4.8.2 Scope Of Static Declarations ............................................................................ 66 4.8.3 Caveat With Regard to Macro Use .................................................................. 66 4.8.4 Static Instantiation of Tasks ............................................................................. 66 4.8.5 Static Instantiation Of Semaphores ................................................................ 67 4.8.6 Static Instantiation of Message Queues ......................................................... 68 4.8.7 Static Instantiation of Watchdog Timers ........................................................ 68 4.9 Boot-Time Hook Routine Facility ............................................................................... 69 Boot-Time Hook Routine Stubs and Components ....................................... 69 Using Boot-Time Hook Routine Stubs ........................................................... 70 4.10 Kernel Applications and Kernel Component Requirements ................................. 71 4.11 Building Kernel Application Modules ....................................................................... 71 4.12 Downloading Kernel Application Object Modules to a Target ............................. 72 4.13 Linking Kernel Application Object Modules with VxWorks ................................ 72 4.14 Configuring VxWorks to Run Applications Automatically ................................... 72 5 C++ Development ....................................................................................... 75 5.1 Introduction ...................................................................................................................... 75 5.2 Configuring VxWorks for C++ ..................................................................................... 76 5.3 C++ Header Files ............................................................................................................. 76 Contents vii 5.4 Spawning Tasks That Use C++ ..................................................................................... 76 5.5 Calls Between C and C++ Code .................................................................................... 77 5.6 C++ Compiler Caveats .................................................................................................... 77 5.7 Using C++ in Signal Handlers and ISRs ................................................................... 78 5.8 Downloadable Kernel Modules in C++ ..................................................................... 78 5.9 C++ Compiler Differences ............................................................................................ 78 5.9.1 Template Instantiation ...................................................................................... 78 5.9.2 Run-Time Type Information ............................................................................ 80 5.10 Namespaces ...................................................................................................................... 80 5.11 C++ Exception Handling ................................................................................................ 81 5.12 Standard Template Library (STL) ................................................................................ 81 5.13 C++ Demo Example ........................................................................................................ 81 6 Multitasking ................................................................................................. 83 6.1 Introduction ...................................................................................................................... 83 6.2 About Tasks and Multitasking ..................................................................................... 84 6.2.1 Task States and Transitions .............................................................................. 85 Tasks States and State Symbols ....................................................................... 85 Illustration of Basic Task State Transitions .................................................... 86 6.3 VxWorks System Tasks .................................................................................................. 87 Basic VxWorks Tasks ......................................................................................... 88 Tasks for Optional Components ..................................................................... 91 6.4 Task Scheduling .............................................................................................................. 93 6.4.1 Task Priorities .................................................................................................... 93 6.4.2 VxWorks Traditional Scheduler ...................................................................... 93 Priority-Based Preemptive Scheduling .......................................................... 94 Scheduling and the Ready Queue ................................................................. 94 Round-Robin Scheduling ................................................................................. 95 6.5 Task Creation and Management ................................................................................... 97 6.5.1 Task Creation and Activation .......................................................................... 97 Static instantiation of Tasks ............................................................................. 98 6.5.2 Task Names and IDs ......................................................................................... 98 Task Naming Rules ........................................................................................... 99 Task Name and ID Routines ............................................................................ 99 VxWorks Kernel Programmer's Guide, 6.9 viii 6.5.3 Inter-Process Communication With Public Tasks ......................................... 99 6.5.4 Task Creation Options ...................................................................................... 100 6.5.5 Task Stack ........................................................................................................... 102 Task Stack Protection ........................................................................................ 102 6.5.6 Task Information ............................................................................................... 103 6.5.7 Task Deletion and Deletion Safety .................................................................. 104 6.5.8 Task Execution Control ..................................................................................... 105 6.5.9 Task Scheduling Control .................................................................................. 106 6.5.10 Tasking Extensions: Using Hook Routines .................................................... 107 6.6 Task Error Status: errno .................................................................................................. 108 6.6.1 Layered Definitions of errno ........................................................................... 109 6.6.2 A Separate errno Value for Each Task ............................................................ 109 6.6.3 Error Return Convention ................................................................................. 109 6.6.4 Assignment of Error Status Values ................................................................. 110 6.7 Task Exception Handling ............................................................................................... 110 6.8 Shared Code and Reentrancy ........................................................................................ 111 6.8.1 Dynamic Stack Variables .................................................................................. 112 6.8.2 Guarded Global and Static Variables ............................................................. 112 6.8.3 Task-Specific Variables .................................................................................... 113 Thread-Local Variables: __thread Storage Class ........................................... 113 taskVarLib and Task Variables ........................................................................ 114 6.8.4 Multiple Tasks with the Same Main Routine ................................................ 114 7 Intertask and Interprocess Communication ............................................. 117 7.1 Introduction ...................................................................................................................... 117 7.2 About Intertask and Interprocess Communication .................................................. 118 7.3 Shared Data Structures ................................................................................................... 119 7.4 Interrupt Locks ............................................................................................................... 120 7.5 Task Locks ........................................................................................................................ 121 7.6 Semaphores ...................................................................................................................... 122 7.6.1 Inter-Process Communication With Public Semaphores ............................. 123 7.6.2 Semaphore Creation and Use .......................................................................... 123 Options for Scalable and Inline Semaphore Routines ................................ 125 Static Instantiation of Semaphores ................................................................. 125 Scalable and Inline Semaphore Take and Give Routines ........................... 126 Contents ix 7.6.3 Binary Semaphores ........................................................................................... 126 Mutual Exclusion .............................................................................................. 127 Synchronization ................................................................................................. 128 7.6.4 Mutual-Exclusion Semaphores ....................................................................... 129 Priority Inversion and Priority Inheritance ................................................... 129 Deletion Safety ................................................................................................... 132 Recursive Resource Access .............................................................................. 133 7.6.5 Counting Semaphores ...................................................................................... 134 7.6.6 Read/Write Semaphores ................................................................................. 134 Specification of Read or Write Mode .............................................................. 135 Precedence for Write Access Operations ....................................................... 136 Read/Write Semaphores and System Performance ..................................... 136 7.6.7 Special Semaphore Options ............................................................................. 136 Semaphore Timeout .......................................................................................... 136 Semaphores and Queueing .............................................................................. 137 Semaphores and VxWorks Events .................................................................. 137 7.7 Message Queues .............................................................................................................. 137 7.7.1 Inter-Process Communication With Public Message Queues ..................... 138 7.7.2 Message Creation and Use ............................................................................... 138 Static Instantiation of Message Queues ......................................................... 139 Message Queue Timeout .................................................................................. 139 Message Queue Urgent Messages .................................................................. 140 Message Queues and Queuing Options ........................................................ 140 7.7.3 Displaying Message Queue Attributes .......................................................... 141 7.7.4 Servers and Clients with Message Queues .................................................... 141 7.7.5 Message Queues and VxWorks Events .......................................................... 142 7.8 Pipes ................................................................................................................................... 142 7.8.1 Creating Pipes ................................................................................................... 142 7.8.2 Writing to Pipes from ISRs ............................................................................... 142 7.8.3 I/O Control Functions ...................................................................................... 143 7.9 VxWorks Events ............................................................................................................... 143 7.9.1 Configuring VxWorks for Events .................................................................... 144 7.9.2 About Event Flags and the Task Events Register ......................................... 144 7.9.3 Receiving Events ............................................................................................... 145 7.9.4 Sending Events .................................................................................................. 146 7.9.5 Inter-Process Communication With Events .................................................. 148 7.9.6 Events Routines ................................................................................................. 148 7.9.7 Code Example ................................................................................................... 149 7.9.8 Show Routines and Events .............................................................................. 149 VxWorks Kernel Programmer's Guide, 6.9 x 7.10 Inter-Process Communication With Public Objects ................................................. 149 Creating and Naming Public and Private Objects ....................................... 150 Example of Inter-process Communication With a Public Semaphore ...... 150 7.11 About VxWorks API Timeout Parameters .................................................................. 152 7.12 About Object Ownership and Resource Reclamation ............................................. 152 8 Signals, ISRs, and Watchdog Timers ........................................................ 155 8.1 Introduction ...................................................................................................................... 155 8.2 Signals .............................................................................................................................. 156 8.2.1 Configuring VxWorks for Signals .................................................................. 157 8.2.2 Basic Signal Routines ........................................................................................ 158 8.2.3 Queued Signal Routines .................................................................................. 159 8.2.4 Signal Events ...................................................................................................... 162 8.2.5 Signal Handlers ................................................................................................. 163 8.3 Interrupt Service Routines: ISRs ................................................................................. 166 8.3.1 Configuring VxWorks for ISRs ........................................................................ 166 Configuring the Interrupt Stack ...................................................................... 166 Adding Show Routine Support ....................................................................... 167 8.3.2 Writing ISRs ....................................................................................................... 167 Restrictions on ISRs ........................................................................................... 167 Facilities Available for ISRs .............................................................................. 169 Reserving High Interrupt Levels .................................................................... 170 8.3.3 System Clock ISR Modification ....................................................................... 171 8.3.4 Connecting ISRs to Interrupts ......................................................................... 171 8.3.5 Getting Information About ISRs ..................................................................... 172 8.3.6 Debugging ISRs ................................................................................................. 173 8.4 Watchdog Timers ............................................................................................................. 174 Static Instantiation of Watchdog Timers ........................................................ 175 8.4.1 Inter-Process Communication With Public Watchdog Timers ................... 176 9 POSIX Facilities .......................................................................................... 177 9.1 Introduction ...................................................................................................................... 178 9.2 Configuring VxWorks with POSIX Facilities ............................................................ 179 9.2.1 VxWorks Components for POSIX Facilities .................................................. 179 9.3 General POSIX Support ................................................................................................. 180 9.4 POSIX Header Files ........................................................................................................ 181 Contents xi 9.5 POSIX Namespace .......................................................................................................... 183 9.6 POSIX Clocks and Timers ............................................................................................. 183 9.7 POSIX Asynchronous I/O .............................................................................................. 186 9.8 POSIX Advisory File Locking ....................................................................................... 186 9.9 POSIX Page-Locking Interface ..................................................................................... 186 9.10 POSIX Threads ................................................................................................................ 187 9.10.1 POSIX Thread Attributes ................................................................................. 188 9.10.2 VxWorks-Specific Pthread Attributes ............................................................ 188 9.10.3 Specifying Attributes when Creating Pthreads ........................................... 189 9.10.4 POSIX Thread Creation and Management .................................................... 190 9.10.5 POSIX Thread Attribute Access ...................................................................... 190 9.10.6 POSIX Thread Private Data ............................................................................. 191 9.10.7 POSIX Thread Cancellation ............................................................................. 192 9.11 POSIX Thread Mutexes and Condition Variables .................................................... 193 9.11.1 Thread Mutexes ................................................................................................. 193 Protocol Mutex Attribute ................................................................................ 194 Priority Ceiling Mutex Attribute .................................................................... 195 9.11.2 Condition Variables .......................................................................................... 195 9.12 POSIX and VxWorks Scheduling ................................................................................. 196 9.12.1 Differences in POSIX and VxWorks Scheduling ........................................... 197 9.12.2 POSIX and VxWorks Priority Numbering ..................................................... 198 9.12.3 Default Scheduling Policy ................................................................................ 198 9.12.4 VxWorks Traditional Scheduler ...................................................................... 198 9.12.5 POSIX Threads Scheduler ................................................................................ 199 9.12.6 POSIX Scheduling Routines ............................................................................ 203 9.12.7 Getting Scheduling Parameters: Priority Limits and Time Slice ................ 204 9.13 POSIX Semaphores ......................................................................................................... 204 9.13.1 Comparison of POSIX and VxWorks Semaphores ....................................... 205 9.13.2 Using Unnamed Semaphores .......................................................................... 206 9.13.3 Using Named Semaphores .............................................................................. 208 9.14 POSIX Message Queues ................................................................................................. 211 9.14.1 Comparison of POSIX and VxWorks Message Queues ............................... 212 9.14.2 POSIX Message Queue Attributes .................................................................. 213 9.14.3 Displaying Message Queue Attributes .......................................................... 214 VxWorks Kernel Programmer's Guide, 6.9 xii 9.14.4 Communicating Through a Message Queue ................................................ 215 9.14.5 Notification of Message Arrival ..................................................................... 218 9.15 POSIX Signals .................................................................................................................. 222 9.16 POSIX Memory Management ....................................................................................... 222 10 Memory Management ................................................................................. 223 10.1 Introduction ...................................................................................................................... 223 10.2 32-Bit VxWorks Memory Layout ................................................................................. 224 10.2.1 Displaying Information About Memory Layout .......................................... 224 10.2.2 System Memory Map Without RTP Support ................................................ 224 10.2.3 System Memory Map with RTP Support ....................................................... 226 10.2.4 System RAM Autosizing .................................................................................. 228 10.2.5 Reserved Memory: User-Reserved Memory and Persistent Memory ...... 228 10.3 64-Bit VxWorks Memory Layout ................................................................................. 229 10.3.1 Displaying Information About Memory Layout .......................................... 230 10.3.2 Virtual Memory Regions .................................................................................. 230 Kernel System Virtual Memory Region ......................................................... 231 Kernel Virtual Memory Pool Region .............................................................. 232 Kernel Reserved Memory Region ................................................................... 232 Shared User Virtual Memory Region ............................................................. 232 RTP Private Virtual Memory Region .............................................................. 232 10.3.3 Global RAM Pool .............................................................................................. 233 10.3.4 Kernel Memory Map ........................................................................................ 233 Kernel System Memory .................................................................................... 235 Kernel Common Heap ...................................................................................... 235 DMA32 Heap ..................................................................................................... 235 User-Reserved Memory ................................................................................... 235 Persistent Memory ............................................................................................ 235 10.3.5 Reserved Memory Configuration: User-Reserved Memory and Persistent Memory .............................................................................................................. 236 10.3.6 System RAM Autosizing .................................................................................. 236 10.4 About VxWorks Memory Allocation Facilities ......................................................... 236 10.5 32-Bit VxWorks Heap and Memory Partition Management .................................. 237 10.5.1 Configuring the Kernel Heap and the Memory Partition Manager .......... 238 10.5.2 Basic Heap and Memory Partition Manager ................................................. 238 10.5.3 Full Heap and Memory Partition Manager ................................................... 238 10.6 64-Bit VxWorks Heap and Memory Partition Management .................................. 239 10.6.1 Kernel Common Heap ...................................................................................... 239 Contents xiii 10.6.2 Kernel Proximity Heap ..................................................................................... 240 10.6.3 DMA32 Heap ..................................................................................................... 240 10.7 SMP-Optimized Memory Allocation .......................................................................... 241 10.7.1 Configuration ..................................................................................................... 241 10.7.2 Usage scenarios ................................................................................................. 241 10.8 Memory Pools .................................................................................................................. 242 10.9 POSIX Memory Management ....................................................................................... 242 10.9.1 POSIX Memory Management APIs ................................................................ 243 10.9.2 POSIX Memory Mapping ................................................................................ 244 10.9.3 POSIX Memory Protection ............................................................................... 244 10.9.4 POSIX Memory Locking .................................................................................. 244 10.10 Memory Mapping Facilities .......................................................................................... 245 10.10.1 POSIX Memory-Mapped Files ........................................................................ 247 10.10.2 POSIX Shared Memory Objects ...................................................................... 247 10.10.3 Anonymous Memory Mapping ...................................................................... 247 10.10.4 Device Memory Objects ................................................................................... 248 10.10.5 Shared Data Regions ......................................................................................... 249 10.11 Virtual Memory Management ..................................................................................... 249 10.11.1 Configuring Virtual Memory Management .................................................. 250 10.11.2 Managing Virtual Memory Programmatically ............................................. 251 Modifying Page States ...................................................................................... 252 Making Memory Non-Writable ...................................................................... 253 Invalidating Memory Pages ............................................................................ 255 Locking TLB Entries .......................................................................................... 255 Page Size Optimization .................................................................................... 255 Setting Page States in ISRs ............................................................................... 256 10.11.3 Troubleshooting ................................................................................................. 256 10.12 Additional Memory Protection Features ................................................................... 257 10.12.1 Configuring VxWorks for Additional Memory Protection ......................... 257 10.12.2 Stack Overrun and Underrun Detection ........................................................ 258 10.12.3 Non-Executable Task Stack .............................................................................. 258 10.12.4 Text Segment Write Protection ........................................................................ 258 10.12.5 Exception Vector Table Write Protection ........................................................ 259 10.13 Memory Error Detection ................................................................................................ 259 10.13.1 Heap and Partition Memory Instrumentation .............................................. 259 10.13.2 Compiler Instrumentation: 32-Bit VxWorks .................................................. 264 VxWorks Kernel Programmer's Guide, 6.9 xiv 11 I/O System ................................................................................................... 269 11.1 Introduction ...................................................................................................................... 269 11.2 About the VxWorks I/O System ................................................................................... 270 Differences Between VxWorks and Host System I/O ................................. 270 11.3 Configuring VxWorks With I/O Facilities .................................................................. 271 11.4 I/O Devices, Named Files, and File Systems ............................................................ 272 11.5 Remote File System Access From VxWorks ............................................................... 273 NFS File System Access from VxWorks ......................................................... 273 Non-NFS Network File System Access from VxWorks WIth FTP or RSH 273 11.6 Basic I/O ............................................................................................................................ 275 11.6.1 File Descriptors .................................................................................................. 275 File Descriptor Table ......................................................................................... 276 11.6.2 Standard Input, Standard Output, and Standard Error .............................. 276 11.6.3 Standard I/O Redirection ................................................................................ 276 Issues with Standard I/O Redirection ........................................................... 277 11.6.4 Open and Close ................................................................................................. 278 11.6.5 Create and Remove ........................................................................................... 280 11.6.6 Read and Write .................................................................................................. 281 11.6.7 File Truncation ................................................................................................... 281 11.6.8 I/O Control ........................................................................................................ 282 11.6.9 Pending on Multiple File Descriptors with select( ) ..................................... 282 11.6.10 POSIX File System Routines ............................................................................ 284 11.7 Standard I/O ..................................................................................................................... 285 11.7.1 Configuring VxWorks With Standard I/O .................................................... 285 11.7.2 About printf( ), sprintf( ), and scanf( ) ............................................................ 286 11.7.3 About Standard I/O and Buffering ................................................................ 286 11.7.4 About Standard Input, Standard Output, and Standard Error .................. 287 11.8 Other Formatted I/O ....................................................................................................... 287 11.8.1 Output in Serial I/O Polled Mode: kprintf( ) ................................................ 287 Writing to User-Defined Storage Media With kprintf( ) and kputs( ) ....... 288 11.8.2 Additional Formatted I/O Routines ............................................................. 289 11.8.3 Message Logging ............................................................................................... 289 11.9 Asynchronous Input/Output ......................................................................................... 289 11.9.1 The POSIX AIO Routines ................................................................................. 290 Contents xv 11.9.2 AIO Control Block ............................................................................................. 291 11.9.3 Using AIO ........................................................................................................... 292 AIO with Periodic Checks for Completion ................................................... 292 Alternatives for Testing AIO Completion ..................................................... 294 12 Devices ........................................................................................................ 297 12.1 Introduction ...................................................................................................................... 297 12.2 About Devices in VxWorks ........................................................................................... 298 12.3 Serial I/O Devices: Terminal and Pseudo-Terminal Devices .................................. 299 tty Options .......................................................................................................... 299 12.3.1 Raw Mode and Line Mode .............................................................................. 300 12.3.2 tty Special Characters ....................................................................................... 300 12.3.3 I/O Control Functions ...................................................................................... 301 12.4 Pipe Devices ..................................................................................................................... 302 12.5 Pseudo I/O Device ........................................................................................................... 302 12.5.1 I/O Control Functions ...................................................................................... 303 12.6 Null Devices .................................................................................................................... 303 12.7 Block Devices ................................................................................................................... 303 12.7.1 XBD RAM Disk .................................................................................................. 305 12.7.2 SCSI Drivers ....................................................................................................... 306 Configuring SCSI Drivers ................................................................................ 306 Structure of the SCSI Subsystem ..................................................................... 307 Booting and Initialization ................................................................................ 308 Device-Specific Configuration Options ......................................................... 308 SCSI Configuration Examples ......................................................................... 310 Troubleshooting ................................................................................................. 312 12.8 Extended Block Device Facility: XBD ......................................................................... 313 12.8.1 XBD Disk Partition Manager ........................................................................... 313 12.8.2 XBD Block Device Wrapper ............................................................................. 314 12.8.3 XBD TRFS Component ..................................................................................... 314 12.9 PCMCIA ............................................................................................................................ 315 12.10 Peripheral Component Interconnect: PCI .................................................................. 315 12.11 Network File System (NFS) Devices ........................................................................... 315 12.11.1 I/O Control Functions for NFS Clients .......................................................... 316 12.12 Non-NFS Network Devices ........................................................................................... 317 VxWorks Kernel Programmer's Guide, 6.9 xvi 12.12.1 Creating Network Devices ............................................................................... 318 12.12.2 I/O Control Functions ...................................................................................... 318 12.13 Sockets ............................................................................................................................... 318 12.14 Internal I/O System Structure ....................................................................................... 319 12.14.1 Drivers ................................................................................................................ 321 The Driver Table and Installing Drivers ........................................................ 322 Example of Installing a Driver ........................................................................ 322 12.14.2 Devices ................................................................................................................ 323 The Device List and Adding Devices ............................................................. 323 Example of Adding Devices ............................................................................ 324 Deleting Devices ................................................................................................ 324 12.14.3 File Descriptors .................................................................................................. 327 File Descriptor Table ......................................................................................... 327 Example of Opening a File ............................................................................... 327 Example of Reading Data from the File ......................................................... 330 Example of Closing a File ................................................................................. 331 Implementing select( ) ...................................................................................... 331 Cache Coherency ............................................................................................... 334 13 Local File Systems ..................................................................................... 339 13.1 Introduction ...................................................................................................................... 339 13.2 File System Monitor ...................................................................................................... 341 Device Insertion Events .................................................................................... 342 XBD Name Mapping Facility .......................................................................... 343 13.3 Virtual Root File System: VRFS ................................................................................... 343 13.4 Highly Reliable File System: HRFS ............................................................................ 345 13.4.1 Configuring VxWorks for HRFS ..................................................................... 345 13.4.2 Configuring HRFS ............................................................................................ 346 13.4.3 Creating an HRFS File System ....................................................................... 347 Overview of HRFS File System Creation ....................................................... 347 HRFS File System Creation Steps ................................................................... 347 13.4.4 HRFS, ATA, and RAM Disk Examples .......................................................... 348 13.4.5 Optimizing HRFS Performance ...................................................................... 353 13.4.6 Transactional Operations and Commit Policies ......................................... 353 Automatic Commit Policy ............................................................................... 353 High-Speed Commit Policy ............................................................................. 354 Mandatory Commits ......................................................................................... 354 Rollbacks ............................................................................................................. 354 Programmatically Initiating Commits ........................................................... 354 13.4.7 File Access Time Stamps .................................................................................. 355 Contents xvii 13.4.8 Maximum Number of Files and Directories ................................................. 355 13.4.9 Working with Directories ................................................................................. 355 Creating Subdirectories .................................................................................... 355 Removing Subdirectories ................................................................................. 356 Reading Directory Entries ................................................................................ 356 13.4.10 Working with Files ............................................................................................ 356 File I/O Routines ............................................................................................... 356 File Linking and Unlinking ............................................................................. 356 File Permissions ................................................................................................. 357 13.4.11 I/O Control Functions Supported by HRFS ................................................. 357 13.4.12 Crash Recovery and Volume Consistency ..................................................... 358 Crash Recovery .................................................................................................. 358 Consistency Checking ...................................................................................... 358 13.4.13 File Management and Full Devices ................................................................ 358 13.5 MS-DOS-Compatible File System: dosFs .................................................................. 359 13.5.1 Configuring VxWorks for dosFs ..................................................................... 360 13.5.2 Configuring dosFs ............................................................................................ 361 13.5.3 Creating a dosFs File System ........................................................................... 362 Overview of dosFs File System Creation ....................................................... 362 dosFs File System Creation Steps ................................................................... 363 13.5.4 dosFs, ATA Disk, and RAM Disk Examples ................................................. 365 13.5.5 Optimizing dosFs Performance ...................................................................... 369 13.5.6 Working with Volumes and Disks .................................................................. 370 Accessing Volume Configuration Information ............................................. 370 Synchronizing Volumes .................................................................................... 370 13.5.7 Working with Directories ................................................................................. 370 Creating Subdirectories .................................................................................... 370 Removing Subdirectories ................................................................................. 371 Reading Directory Entries ................................................................................ 371 13.5.8 Working with Files ............................................................................................ 371 File I/O Routines ............................................................................................... 371 File Attributes .................................................................................................... 371 13.5.9 Disk Space Allocation Options ........................................................................ 373 Choosing an Allocation Method ..................................................................... 374 Using Cluster Group Allocation ..................................................................... 374 Using Absolutely Contiguous Allocation ...................................................... 374 13.5.10 Crash Recovery and Volume Consistency ..................................................... 376 13.5.11 I/O Control Functions Supported by dosFsLib ............................................ 376 13.5.12 Booting from a Local dosFs File System Using SCSI ................................... 378 13.6 Transaction-Based Reliable File System Support for dosFs: TRFS ....................... 380 VxWorks Kernel Programmer's Guide, 6.9 xviii 13.6.1 Configuring VxWorks With TRFS ................................................................... 380 13.6.2 Automatic Instantiation of TRFS .................................................................... 380 13.6.3 Formatting a Device for TRFS ......................................................................... 381 13.6.4 Using TRFS in Applications ............................................................................ 382 TRFS Code Examples ....................................................................................... 382 13.7 Raw File System: rawFs ................................................................................................. 383 13.7.1 Configuring VxWorks for rawFs ..................................................................... 383 13.7.2 Creating a rawFs File System .......................................................................... 383 13.7.3 Mounting rawFs Volumes ................................................................................ 384 13.7.4 rawFs File I/O ................................................................................................... 385 13.7.5 I/O Control Functions Supported by rawFsLib ........................................... 385 13.8 CD-ROM File System: cdromFs ................................................................................... 386 13.8.1 Configuring VxWorks for cdromFs ................................................................ 387 13.8.2 Creating and Using cdromFs ........................................................................... 387 13.8.3 I/O Control Functions Supported by cdromFsLib ...................................... 389 13.8.4 Version Numbers ............................................................................................... 390 13.9 Read-Only Memory File System: ROMFS ................................................................. 390 13.9.1 Configuring VxWorks with ROMFS ............................................................... 391 13.9.2 Adding a ROMFS Directory and File Content to VxWorks ........................ 391 13.9.3 Accessing Files in ROMFS ............................................................................... 392 13.9.4 Using ROMFS to Start Applications Automatically .................................... 392 13.10 Target Server File System: TSFS ................................................................................... 392 Socket Support ................................................................................................... 393 Error Handling .................................................................................................. 394 Configuring VxWorks for TSFS Use ............................................................... 394 Security Considerations ................................................................................... 394 Using the TSFS to Boot a Target ...................................................................... 395 14 Flash File System Support: TrueFFS ........................................................ 397 14.1 Introduction ...................................................................................................................... 397 14.2 Overview of Implementation Steps ............................................................................ 398 14.3 Creating a VxWorks System with TrueFFS ................................................................ 400 14.3.1 Selecting an MTD .............................................................................................. 400 14.3.2 Identifying the Socket Driver .......................................................................... 400 14.3.3 Configuring VxWorks with TrueFFS and File System ................................. 401 Including the Core TrueFFS Component ....................................................... 401 Including the MTD Component ...................................................................... 402 Contents xix Including the Translation Layer Component ................................................ 402 Including the Socket Driver ............................................................................. 403 Including the XBD Wrapper Component ...................................................... 403 Including File System Components ............................................................... 403 Including Utility Components ........................................................................ 403 14.3.4 Building the System .......................................................................................... 404 14.3.5 Formatting the Flash ......................................................................................... 404 Formatting With sysTffsFormat( ) .................................................................. 404 Formatting With tffsDevFormat( ) .................................................................. 405 14.3.6 Reserving a Region in Flash for a Boot Image .............................................. 406 Reserving a Fallow Region .............................................................................. 407 Writing the Boot Image to Flash ...................................................................... 408 14.3.7 Mounting the Drive .......................................................................................... 409 14.3.8 Creating a File System ...................................................................................... 409 14.3.9 Testing the Drive ............................................................................................... 410 14.4 Using TrueFFS Shell Commands ................................................................................. 410 14.5 Using TrueFFS With HRFS ............................................................................................
Linux System Administrator Guide Version0.9
Linux System Administrator Guide Version0.9

Table of Contents
About This Book.................................................................................................................................................1
1. Acknowledgments................................................................................................................................1
1.1. Joanna's acknowledgments.........................................................................................................1
1.2. Stephen's acknowledgments.......................................................................................................1
1.3. Alex's Acknowledgments...........................................................................................................2
2. Revision History..................................................................................................................................2
3. Source and pre-formatted versions available......................................................................................2
4. Typographical Conventions.................................................................................................................3
Chapter 1. Introduction......................................................................................................................................4
1.1. Linux or GNU/Linux, that is the question........................................................................................5
1.2. Trademarks.......................................................................................................................................5
Chapter 2. Overview of a Linux System...........................................................................................................7
2.1. Various parts of an operating system................................................................................................7
2.2. Important parts of the kernel.............................................................................................................7
2.3. Major services in a UNIX system.....................................................................................................8
2.3.1. init............................................................................................................................................9
2.3.2. Logins from terminals.............................................................................................................9
2.3.3. Syslog......................................................................................................................................9
2.3.4. Periodic command execution: cron and at............................................................................10
2.3.5. Graphical user interface.........................................................................................................10
2.3.6. Networking............................................................................................................................10
2.3.7. Network logins......................................................................................................................11
2.3.8. Network file systems.............................................................................................................11
2.3.9. Mail.......................................................................................................................................11
2.3.10. Printing................................................................................................................................12
2.3.11. The filesystem layout..........................................................................................................12
Chapter 3. Overview of the Directory Tree....................................................................................................13
3.1. Background.....................................................................................................................................13
3.2. The root filesystem.........................................................................................................................14
3.3. The/etc directory............................................................................................................................15
3.4. The/dev directory...........................................................................................................................17
3.5. The/usr filesystem..........................................................................................................................19
3.6. The/var filesystem..........................................................................................................................19
3.7. The/proc filesystem........................................................................................................................20
Chapter 4. Hardware, Devices, and Tools......................................................................................................22
4.1. Hardware Utilities...........................................................................................................................22
4.1.1. The MAKEDEV Script.........................................................................................................22
4.1.2. The mknod command............................................................................................................22
4.1.3. The lspci command...............................................................................................................23
4.1.4. The lsdev command...............................................................................................................23
4.1.5. The lsusb command...............................................................................................................23
4.1.6. The lsraid command..............................................................................................................23
4.1.7. The hdparm command...........................................................................................................23
4.1.8. More Hardware Resources....................................................................................................23
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Chapter 4. Hardware, Devices, and Tools
4.2. Kernel Modules...............................................................................................................................23
4.2.1. lsmod.....................................................................................................................................24
4.2.2. insmod...................................................................................................................................24
4.2.3. depmod..................................................................................................................................24
4.2.4. rmmod...................................................................................................................................24
4.2.5. modprobe...............................................................................................................................24
Chapter 5. Using Disks and Other Storage Media.........................................................................................25
5.1. Two kinds of devices......................................................................................................................25
5.2. Hard disks.......................................................................................................................................26
5.3. Storage Area Networks - Draft......................................................................................................28
5.4. Network Attached Storage - Draft.................................................................................................28
5.4.1. NFS........................................................................................................................................29
5.4.2. CIFS.......................................................................................................................................29
5.5. Floppies...........................................................................................................................................29
5.6. CD-ROMs......................................................................................................................................30
5.7. Tapes...............................................................................................................................................31
5.8. Formatting.......................................................................................................................................31
5.9. Partitions.........................................................................................................................................32
5.9.1. The MBR, boot sectors and partition table............................................................................33
5.9.2. Extended and logical partitions.............................................................................................33
5.9.3. Partition types........................................................................................................................34
5.9.4. Partitioning a hard disk..........................................................................................................35
5.9.5. Device files and partitions.....................................................................................................36
5.10. Filesystems....................................................................................................................................36
5.10.1. What are filesystems?..........................................................................................................36
5.10.2. Filesystems galore...............................................................................................................37
5.10.3. Which filesystem should be used?......................................................................................39
5.10.4. Creating a filesystem...........................................................................................................39
5.10.5. Filesystem block size...........................................................................................................40
5.10.6. Filesystem comparison........................................................................................................41
5.10.7. Mounting and unmounting..................................................................................................42
5.10.8. Filesystem Security.............................................................................................................45
5.10.9. Checking filesystem integrity with fsck..............................................................................45
5.10.10. Checking for disk errors with badblocks...........................................................................46
5.10.11. Fighting fragmentation?....................................................................................................46
5.10.12. Other tools for all filesystems...........................................................................................47
5.10.13. Other tools for the ext2/ext3 filesystem............................................................................47
5.11. Disks without filesystems.............................................................................................................48
5.12. Allocating disk space....................................................................................................................49
5.12.1. Partitioning schemes............................................................................................................49
5.12.2. Logical Volume Manager (LVM).......................................................................................50
5.12.3. Space requirements..............................................................................................................50
5.12.4. Examples of hard disk allocation........................................................................................50
5.12.5. Adding more disk space for Linux......................................................................................51
5.12.6. Tips for saving disk space...................................................................................................51
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Chapter 6. Memory Management...................................................................................................................52
6.1. What is virtual memory?.................................................................................................................52
6.2. Creating a swap space.....................................................................................................................52
6.3. Using a swap space.........................................................................................................................53
6.4. Sharing swap spaces with other operating systems........................................................................54
6.5. Allocating swap space.....................................................................................................................55
6.6. The buffer cache.............................................................................................................................56
Chapter 7. System Monitoring.........................................................................................................................58
7.1. System Resources...........................................................................................................................58
7.1.1. The top command..................................................................................................................58
7.1.2. The iostat command..............................................................................................................59
7.1.3. The ps command...................................................................................................................60
7.1.4. The vmstat command............................................................................................................61
7.1.5. The lsof command.................................................................................................................61
7.1.6. Finding More Utilities...........................................................................................................62
7.2. Filesystem Usage............................................................................................................................62
7.2.1. The df command....................................................................................................................62
7.2.2. The du command...................................................................................................................62
7.2.3. Quotas....................................................................................................................................63
7.3. Monitoring Users............................................................................................................................63
7.3.1. The who command................................................................................................................63
7.3.2. The ps command -again!......................................................................................................64
7.3.3. The w command....................................................................................................................64
7.3.4. The skill command................................................................................................................64
7.3.5. nice and renice.......................................................................................................................64
Chapter 8. Boots And Shutdowns....................................................................................................................65
8.1. An overview of boots and shutdowns.............................................................................................65
8.2. The boot process in closer look......................................................................................................65
8.2.1. A Word About Bootloaders...................................................................................................67
8.3. More about shutdowns....................................................................................................................67
8.4. Rebooting........................................................................................................................................68
8.5. Single user mode.............................................................................................................................69
8.6. Emergency boot floppies................................................................................................................69
Chapter 9. init....................................................................................................................................................70
9.1. init comes first................................................................................................................................70
9.2. Configuring init to start getty: the/etc/inittab file..........................................................................70
9.3. Run levels.......................................................................................................................................71
9.4. Special configuration in/etc/inittab................................................................................................73
9.5. Booting in single user mode...........................................................................................................73
Chapter 10. Logging In And Out.....................................................................................................................75
10.1. Logins via terminals......................................................................................................................75
10.2. Logins via the network..................................................................................................................76
10.3. What login does............................................................................................................................77
10.4. X and xdm.....................................................................................................................................78
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Chapter 10. Logging In And Out
10.5. Access control...............................................................................................................................78
10.6. Shell startup..................................................................................................................................78
Chapter 11. Managing user accounts..............................................................................................................79
11.1. What's an account?........................................................................................................................79
11.2. Creating a user..............................................................................................................................79
11.2.1./etc/passwd and other informative files...............................................................................79
11.2.2. Picking numeric user and group ids....................................................................................80
11.2.3. Initial environment: /etc/skel...............................................................................................80
11.2.4. Creating a user by hand.......................................................................................................80
11.3. Changing user properties..............................................................................................................81
11.4. Removing a user...........................................................................................................................81
11.5. Disabling a user temporarily.........................................................................................................82
Chapter 12. Backups.........................................................................................................................................83
12.1. On the importance of being backed up.........................................................................................83
12.2. Selecting the backup medium.......................................................................................................83
12.3. Selecting the backup tool..............................................................................................................84
12.4. Simple backups.............................................................................................................................85
12.4.1. Making backups with tar.....................................................................................................85
12.4.2. Restoring files with tar........................................................................................................86
12.5. Multilevel backups........................................................................................................................87
12.6. What to back up............................................................................................................................88
12.7. Compressed backups.....................................................................................................................89
Chapter 13. Task Automation --To Be Added.............................................................................................90
Chapter 14. Keeping Time...............................................................................................................................91
14.1. The concept of localtime...............................................................................................................91
14.2. The hardware and software clocks................................................................................................92
14.3. Showing and setting time..............................................................................................................92
14.4. When the clock is wrong...............................................................................................................93
14.5. NTP - Network Time Protocol.....................................................................................................93
14.6. Basic NTP configuration...............................................................................................................94
14.7. NTP Toolkit..................................................................................................................................95
14.8. Some known NTP servers.............................................................................................................97
14.9. NTP Links.....................................................................................................................................97
Chapter 15. System Logs --To Be Added......................................................................................................98
Chapter 16. System Updates --To Be Added................................................................................................99
Chapter 17. The Linux Kernel Source..........................................................................................................100
Chapter 18. Finding Help...............................................................................................................................101
18.1. Newsgroups and Mailing Lists...................................................................................................101
18.1.1. Finding The Right Forum..................................................................................................101
iv

The Linux System Administrator's Guide
Table of Contents
Chapter 18. Finding Help
18.1.2. Before You Post................................................................................................................101
18.1.3. Writing Your Post.............................................................................................................101
18.1.4. Formatting Your Post........................................................................................................102
18.1.5. Follow Up..........................................................................................................................102
18.1.6. More Information..............................................................................................................102
18.2. IRC..............................................................................................................................................102
18.2.1. Colours..............................................................................................................................103
18.2.2. Be Polite............................................................................................................................103
18.2.3. Type Properly, in English..................................................................................................103
18.2.4. Port scanning.....................................................................................................................103
18.2.5. Keep it in the Channel.......................................................................................................103
18.2.6. Stay On Topic....................................................................................................................104
18.2.7. CTCPs...............................................................................................................................104
18.2.8. Hacking, Cracking, Phreaking, Warezing.........................................................................104
18.2.9. Round Up..........................................................................................................................104
18.2.10. Further Reading...............................................................................................................104
Appendix A. GNU Free Documentation License.........................................................................................105
A.1. PREAMBLE................................................................................................................................105
A.2. APPLICABILITY AND DEFINITIONS....................................................................................105
A.3. VERBATIM COPYING..............................................................................................................106
A.4. COPYING IN QUANTITY.........................................................................................................106
A.5. MODIFICATIONS......................................................................................................................107
A.6. COMBINING DOCUMENTS.....................................................................................................108
A.7. COLLECTIONS OF DOCUMENTS..........................................................................................109
A.8. AGGREGATION WITH INDEPENDENT WORKS.................................................................109
A.9. TRANSLATION..........................................................................................................................109
A.10. TERMINATION........................................................................................................................109
A.11. FUTURE REVISIONS OF THIS LICENSE.............................................................................110
A.12. ADDENDUM: How to use this License for your documents...................................................110
Glossary (DRAFT, but not for long hopefully)............................................................................................111
Index-Draft..........................................................................................................................................115
A....................................................................................................................................................115
B....................................................................................................................................................115
C....................................................................................................................................................115
D....................................................................................................................................................116
E.....................................................................................................................................................117
F.....................................................................................................................................................117
G....................................................................................................................................................120
H....................................................................................................................................................120
I......................................................................................................................................................120
K....................................................................................................................................................120
L.....................................................................................................................................................121
M...................................................................................................................................................121
N....................................................................................................................................................121
O....................................................................................................................................................121
v

The Linux System Administrator's Guide
Table of Contents
Glossary (DRAFT, but not for long hopefully)
P.....................................................................................................................................................121
R....................................................................................................................................................122
S.....................................................................................................................................................122
T.....................................................................................................................................................122
V....................................................................................................................................................122
W...................................................................................................................................................122

nfs mount failed: Connection timed out
linux挂载NFS的几个注意事项。在使用嵌入式Linux时，需要注意的几个问题。 1. 服务端需要开启 nfs server 2. 本机挂载，检查服务是否成功。 3. 客户端通过Ping测试，检测网络连通。 4. 客户端需要支持nfs client，在内核中进行配置 $ make menuconfig ARCH=arm 开启对NFS客户端的支持。cat /proc/filesystems 可以查看是否对NFS有支持。 5. 参数设置 由于没有加-o nolock参数导致错误：mounting ...
mount: mounting 192.168.xx.xxx:/home/nfs on /mnt/ failed: No such device
出现这个问题的原因是，内核不支持nfs文件系统，需要配置内核使其支持nfs文件系统 1、进入到内核源码 2、make menuconfig 使用图形化界面进行配置 File systems—> [*] Network File Systems —>
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