Notes, summaries, assignments, exams, and problems for Computers

Implementing a New System Call in the Kernel

Required Files to Add

• /usr/src/test_kernel/SystemCalls/test_call.c:
  • Creates system call pointer.
  • Exports the pointer so that the system call module can access it.
  • Defines the system call wrapper.
• /usr/src/test_kernel/SystemCalls/Makefile: obj-y := test_call.o (Compiles files directly into the kernel).

System Module Implementation

• /usr/src/test_kernel/SystemModule/syscallModule.c:
  • Holds module code.
  • Implements system call behavior.
  • Registers system call pointer to the proper system call handler.
• /usr/src/test_kernel/SystemModule/Makefile: obj-m := syscallmodule.o (Compiles file as a module).

Required Files to Modify

• /usr/src/test_kernel/arch/x86/entry/syscalls/syscall_64.tbl: Add the system call to the table.
• /usr/

Mechatronics engineers are responsible for designing mechanical equipment. Combining their knowledge of computer, mechanical, and electrical engineering, they develop various automated products, such as cameras, cars, and aircraft. The engineering process typically involves designing and assembling components, testing products in development, making improvements, and evaluating finished products. Engineers must also assess equipment and publish reports outlining production factors, such as practical use, safety, and cost.

Work Areas:

• Electronics Development Unit
• Software Development Unit
• Project Management Unit
• Biomechanical Development Unit including our Mechanical Shop and Scientific Glassblower

Mechanical Engineer Job Duties:

• Evaluates mechanical

Network Fundamentals: LANs and WANs

• A Local Area Network (LAN) covers a small geographical area, such as a single site or building (e.g., a school or a college).

• A Wide Area Network (WAN) covers a large geographical area. Most WANs are formed by connecting several LANs, with the internet being a prime example.

Virtual Private Networks (VPNs) Explained

A Virtual Private Network (VPN) is programming that creates a safe, encrypted connection over a less secure network. It provides business travelers with secure access to software applications hosted on proprietary networks. To gain access to a restricted resource through a VPN, the user must be authorized to use the VPN application and provide one or more authentication factors, such as a password.... Continue reading "Networking Essentials: Devices, Protocols, Topologies" »

This section addresses key concepts regarding digital media processing, file formats, and data requirements.

1. Stereo vs. Mono Audio Data Requirements

   Question: What is the difference between stereo and mono audio?

   Answer: Stereo audio usually requires twice as much data as mono audio.

2. Quickest Audio Format for Web Download

   Question: Which audio format would be quickest to download from a website?

   Answer: AAC (Advanced Audio Coding).

3. Audio File Format Compatibility

   Statement: All audio file formats will work on all media players.

   Answer: FALSE. Compatibility depends on the specific media player and the codecs supported.

4. Defining Bit Depth

   Question: What is bit depth?

   Answer: Bit depth is the number of bits it is possible to have in each sample or frame of

M1: Fundamental Graph Definitions

Walks, Paths, and Circuits

Walk

A Walk is a finite alternating sequence of vertices and edges, beginning and ending with vertices, such that each edge is incident with the vertices preceding and following it. No edge appears more than once in a walk, though a vertex may appear multiple times.

• Closed Walk: A walk that begins and ends at the same vertex.
• Open Walk: A walk that begins and ends at different vertices.

Path

A Path is an open walk in which no vertex appears more than once. The number of edges in a path is called the length of the path. A self-loop can be included in a walk but not in a path. The terminal vertices of a path are of degree 1, and the remaining intermediate vertices are of degree 2.

Circuit

A... Continue reading "Essential Definitions and Theorems in Graph Theory" »

10LayerModelSecurity,10Security policies and mandates.9,Oversight of end-to-end processes to ensure compliance with enterprise security policies. Audit trails for the threads.8Security roles and responsibilities. Standard security practices as they relate to activities and exchanges. Security Architecture. Personnel security requirements. 3.10. Management7Application service security (e.g., integrity of the service and application code) and content security (e.g., security labels). Security of user access to IT. Privilege management. 6Framework service security (e.g., integrity of the service and application code of the framework). Content security labeling service and label checking service. Software-based content encryption/decryption services... Continue reading "Layered Security Model and IT Infrastructure Best Practices" »

Module 9: Firebase Application

Realtime Database

A cloud-hosted database. Data is stored as JSON and synchronized in real-time to every connected client. Provides easy-to-use services for authentication (email/password, 3rd-party providers like Google/Facebook).

Cloud Firestore

A flexible and scalable database for mobile, web, and development. It offers synchronization, offline support, and ACID transactions.

Cloud Functions

...

Hosting

CSS/JavaScript

Cloud Storage

Provides robust, secure file uploads and downloads for Firebase apps.

Module 10: UML Diagrams

Structural Diagrams

• Class Diagram: Shows class hierarchy, fields/attributes, and relevant methods.

How to Read

• Visibility:
  • +: Public
  • -: Private
  • #: Protected (accessed only by child classes)
• Relationships:

Annotation Elements

Used to notate and clarify the information presented.

Annotate Ribbon

Buttons: Aligned, Linear, Angular, Radial, Diameter, Arc Length, Spot Elevation, Spot Coordinate, Spot Slope, Detail Line, Region, Component, Revision Cloud, Detail Group, Insulation, Text, Check Spelling, Find/Replace, Tag By Category, Tag All, Beam Annotations, Multi-Category, Material Tag, Area Tag, Room Tag, Space Tag, View Reference, Tread Number, Keynote, Duct Legend, Pipe Legend, Color Fill Legend, and Symbol.

Annotate Ribbon Tab

Panels: Dimension, Detail, Text, Tag, Color Fill, and Symbol.

Application Menu

File access and management tools are grouped in this menu. This menu is designated by the large ‘R’ in the top left corner of the Revit screen.... Continue reading "Revit Elements and Tools: A Comprehensive Dictionary" »

Advantages of E-Governance

• Improves delivery and efficiency of government services.
• Improved government interactions with business and industry.
• Citizen empowerment through access to information.
• More efficient government management

Features of PHP

• Simple: It is very simple and easy to use, as compared to other scripting languages.
• Interpreted: It is an interpreted language, i.e. there is no need for compilation.

Supported Datatypes in PHP

• String: A string is a sequence of characters. A string can be any text inside quotes. You can use single or double-quotes.
• Integer: An integer data type is a non-decimal number between -2,147,483,648 and 2,147,483,647.
• Float (floating point numbers): A float (floating-point number) is a number with a decimal point or

Network Protocols (नेटवर्क प्रोटोकॉल)

Frame Relay क्या है? (What is Frame Relay in Hindi)

Frame Relay एक तेज गति का packet switching प्रोटोकॉल है जिसका प्रयोग Wide Area Networks (WANs) में किया जाता है। इसके अलावा, यह दो या दो से अधिक Local Area Networks (LANs) के बीच data को transfer करता है।

Frame Relay एक packet switched टेक्नोलॉजी है। इसे Local Area Networks के बीच कम खर्च में data transfer करने के लिए design किया गया था। साथ ही,... Continue reading "Frame Relay क्या है? फायदे और नुकसान (हिंदी में पूरी जानकारी)" »