learning the unix operating system oreilly pdf

Ngày tải lên: 25/11/2013, 11:07

Ngày tải lên: 18/03/2014, 00:20

... with system messages—messages generated and dispatched by the system. The Message Protocols appendix of the Be Book defines all the system messages. In short, system messages fall into the following categories: Application ... posted message becomes the next in the queue, the looper invokes DispatchMessage() to pass the message to the target handler. The effect is for the posted message to reach the target handler’s ... sev- eral examples of the creating of messages and the dispatching of these messages both by the object that created them and by other objects. Figure 9-1. The inheritance hierarchy for the Application...

Ngày tải lên: 17/10/2013, 19:15

... For the Save file panel, the display of the panel comes when the user chooses the Save As item from the File menu. In response to the message issued by the system to the appropriate MessageReceived() ... control is in the hands of the user. Once the user confirms a choice (whether it’s a file selection in the Open file panel, a click on the Save button in the Save file panel, or a click on the Can- cel ... in either type of panel), a message is automatically sent by the system to the panel’s target. By default the panel’s target is the application object, but this can be changed (either in the BFilePanel...

Ngày tải lên: 20/10/2013, 10:15

... 9.1: Identify Operating System Requirements In this activity, you will first identify the optimal operating system to use in a given situation. Next, you will analyze the operating system selection ... assigned by the instructor. 2. Read the scenario below. 3. Analyze the feasibility of the solution given in the scenario. 4. Make any comments in the space below. After completing the above ... Identify the appropriate operating system for a given set of requirements and constraints. Before You Begin This activity includes both small group tasks and class discussion. Prerequisites There...

Ngày tải lên: 21/12/2013, 06:16

... during the execution of a program. An object can be added or deleted from the heap without regard for its placement in the heap, or for the other contents of the heap. The stack, on the other hand, ... such tasks. The zoom- ing and moving of windows is handled by the system, not by the SimpleApp code. This simple demonstration emphasizes the power of the BeOS system software—it is the system software ... windows tab) ã The type of the window (the look and feel of the window) ã The behavior of the window (whether it has a resize knob, and so forth) Recall from your C++ background that when the definition...

Ngày tải lên: 26/01/2014, 07:20

... file with the same name as the project (and thus the same name as the application that will be built from the project). The header file holds the definition of the class derived from the BApplication ... any resizing of the window. The final BView constructor parameter determines the types of notifications the view is to receive from the system. The Be constant B_WILL_DRAW means that the view should ... stated that the header file that bears the name of the project should hold the declaration of the project’s application class the class derived from the BApplication class. Here you see that the HelloWorld.h...

Ngày tải lên: 26/01/2014, 07:20

Ngày tải lên: 26/01/2014, 07:20

Ngày tải lên: 26/01/2014, 07:20

Ngày tải lên: 26/01/2014, 07:20

Ngày tải lên: 26/01/2014, 07:20

Ngày tải lên: 26/01/2014, 07:20

Ngày tải lên: 26/01/2014, 07:20

Ngày tải lên: 07/04/2014, 15:52

Ngày tải lên: 01/07/2014, 17:30

... several versions of Unix. Until a few years ago, there wer e two main versions: the line of Unix releases that started at AT&T (the latest is System V Release 4), and another from the University ... and window systems. Our examples show the bash shell and the GNOME and KDE window environments. We’ve chosen them because they’re popular and make good examples, not because we think they’re always the ... advanced work or set up Unix systems for other users, we rec- ommend learning about a variety of shells and window systems and choosing the best ones for your needs. The principles explained...

Ngày tải lên: 21/12/2013, 11:15

... architectures. Today, the concept of an extensible operating system is once again gaining acceptance this time as the solution to the unconstrained growth of UNIX. During the last 20 years operating systems and their ... tasks. Many other operating systems have met with this problem. Often these systems solve the problem by using inside knowledge of the algorithms used to manage secondary storage. Unfortunately, the Mach ... of the 8th Symposium on Operating System Principles, pages 64-75. December, 1981. [16] Rashid, R.F. From RIG to Accent to Mach: The Evolution of a Network Operating System. In Proceedings of the...

Ngày tải lên: 12/09/2012, 15:05

... command: ls >there creates a file called there and places the listing there. Thus the argument >there means ‘‘place output on there.’’ On the other hand: ed ordinarily enters the editor, which ... into a system table (the i-list) stored in a known part of the device on which the directory resides. The entry found thereby (the file’s i-node) contains the description of the file: i the user ... However, the structure of files is controlled by the programs that use them, not by the system. 3.2 Directories Directories provide the mapping between the names of files and the files themselves,...

Ngày tải lên: 12/09/2012, 15:05

... 138 Chapter 8 - The UNIX System Interface The UNIX operating system provides its services through a set of system calls, which are in effect functions within the operating system that may be ... is uniform across operating systems. On any particular system the routines of the standard library have to be written in terms of the facilities provided by the host system. In the next few sections ... we will describe the UNIX system calls for input and output, and show how parts of the standard library can be implemented with them. 8.1 File Descriptors In the UNIX operating system, all input...

Ngày tải lên: 30/09/2013, 06:20

... specify the device file associated with the mouse, as shown in Figure 5.5. The install program should have associated your system& apos;s mouse with the device /dev/mouse, which is the default ... idea to write these down so that you remember to observe them even after they've scrolled off the screen. Figure 5.14: The selected card definition Next, you must specify the X server ... graphical output on another computer, connected to the first via a network. With the advent of the Internet, which interconnected a sizable fraction of the computers on the planet, X achieved...

Ngày tải lên: 07/11/2013, 10:15