lecture operating system chapter 09 Security

... the poster of the message and the target of the message don’t have to be one and the same, they can be as shown in this snippet (read the 334 Chapter 9: Messages and Threads case MENU_ADV_HELP_MSG: ... looper and a handler). Throughout this chapter you’ll see sev- eral examples of the creating of messages and the dispatching of these messages both by t...

Ngày tải lên: 17/10/2013, 19:15

... application data member. The Save file panel, on the other hand, affects the window, and is referenced by a window data member. So I want the message sent to the window object rather than the application ... node (data). The entry can be represented by an entry_ref or a BEntry object. Currently the entry is in the form of an entry_ref. Here the entry is stored in a BEntr...

Ngày tải lên: 20/10/2013, 10:15

... unimportant. 2 Chapter 1: BeOS Programming Overview to appear almost daily, and each company needs some way to ensure that the public views their product as the best. Unsurprisingly, the BeOS is also accompa- nied ... uses all of the BeOS kits, it’s a good idea to at least have an idea of the purpose of each. The kits of the BeOS are subject to change. As the B...

Ngày tải lên: 26/01/2014, 07:20

... how the many BeIDE items are organized will be beneficial as you look at existing BeIDE example projects and as you then start to write your own BeOS program. The BeIDE Folders When the BeIDE ... File Organization ã Examining an Existing BeIDE Project ã Setting Up a New BeIDE Project ã HelloWorld Source Code 2 2. BeIDE Projects The BeOS CD-ROM includes the BeIDE...

Ngày tải lên: 26/01/2014, 07:20

... introduction to the BeOS, each chapter describes the classes of one kit. Chapter 2 covers the classes of the Application Kit, Chapter 3 describes 80 Chapter 3: BeOS API Overview Kernel Kit The primary ... Book, double-click on the Chapter 4 document and scroll to the start of the BWindow class description. 88 Chapter 3: BeOS API Overview Overview The Over...

Ngày tải lên: 26/01/2014, 07:20

... Operating System Zoo ã Mainframe operating systems ã Server operating systems ã Multiprocessor operating systems ã Personal computer operating systems ã Real-time operating systems ã Embedded operating ... 1 Introduction Chapter 1 1.1 What is an operating system 1.2 History of operating systems 1.3 The operating system zoo 1.4 Computer hardware review 1.5 Operat...

Ngày tải lên: 18/10/2014, 15:30

... layer of process-structured OS handles interrupts, scheduling ã Above that layer are sequential processes 8 Implementation of Processes (1) Fields of a process table entry 9 Implementation of Processes ... 1 Processes and Threads Chapter 2 2.1 Processes 2.2 Threads 2.3 Interprocess communication 2.4 Classical IPC problems 2.5 Scheduling 2 Processes The Process Mod...

Ngày tải lên: 18/10/2014, 15:30

... 1 Deadlocks Chapter 3 3.1. Resource 3.2. Introduction to deadlocks 3.3. The ostrich algorithm 3.4. Deadlock detection and ... same time another process holds B and requests A both are blocked and remain so 3 Resources (1) ã Deadlocks occur when processes are granted exclusive access to devices – we refer to these devices ... request is denied – requesting process may be block...

Ngày tải lên: 18/10/2014, 15:30

... 1 Memory Management Chapter 4 4.1 Basic memory management 4.2 Swapping 4.3 Virtual memory 4.4 Page replacement algorithms 4.5 Modeling page replacement algorithms 4.6 Design issues for paging systems 4.7 ... Segmentation 2 Memory Management ã Ideally programmers want memory that is large fast non volatile ã Memory hierarchy small amount of fast, expensive memory cac...

Ngày tải lên: 18/10/2014, 15:30

... 1 Input/Output Chapter 5 5.1 Principles of I/O hardware 5.2 Principles of I/O software 5.3 I/O software layers 5.4 Disks 5.5 Clocks 5.6 Character-oriented terminals 5.7 ... in the kernel 2 1 Device-Independent I/O Software (4) Networking may involve many copies 2 2 User-Space I/O Software Layers of the I/O system and the main functions of each layer 2 3 Disks Disk ... position...

Ngày tải lên: 18/10/2014, 15:30

... 1 File Systems Chapter 6 6.1 Files 6.2 Directories 6.3 File system implementation 6.4 Example file systems 2 Long-term Information Storage ã Must store large amounts of data ã Information ... Link 8. Unlink 1 7 File System Implementation A possible file system layout 1 8 Implementing Files (1) (a) Contiguous allocation of disk space for 7 files (b) State of the...

Ngày tải lên: 18/10/2014, 15:30

... (2) MPEG-2 has three kinds of frame: I, P, B 1. Intracoded frames - Self-contained JPEG-encoded pictures 2. Predictive frames - Block-by-block difference with last frame 3. Bi-directional frames - Differences ... 1 Multimedia Chapter 7 7.1 Introduction to multimedia 7.2 Multimedia files 7.3 Video compression 7.4 Multimedia process scheduling 7.5 Multimedia file s...

Ngày tải lên: 18/10/2014, 15:30

... Multiple Processor Systems Chapter 8 8.1 Multiprocessors 8.2 Multicomputers 8.3 Distributed systems Multiprocessor Systems ã Continuous need for faster ... memory via commands - LOAD - STORE 3. Access to remote memory slower than to local Multiprocessor Hardware (6) (a) 256-node directory based multiprocessor (b) Fields of 32-bit memory address (c) ... Hardware (2) ã Sw...

Ngày tải lên: 18/10/2014, 15:30

... 1 Security Chapter 9 9.1 The security environment 9.2 Basics of cryptography 9.3 User authentication 9.4 Attacks from inside the system 9.5 Attacks from outside the system 9.6 ... database of all logins ã Simple login name/password as a trap – security personnel notified when attacker bites 17 Operating System Security Trojan Horses ã Free program made available to unsu...

Ngày tải lên: 18/10/2014, 15:30

... 1 Case Study 1: UNIX and LINUX Chapter 10 10.1 History of unix 10. 2 Overview of unix 10. 3 Processes in unix 10. 4 Memory management in unix 10. 5 Input/output in unix 10. 6 The unix file system ... file system 10. 7 Security in unix 2 UNIX The layers of a UNIX system. Us er Inter face 3 UNIX Utility Programs A few of the more common UNIX utilit...

Ngày tải lên: 18/10/2014, 15:30