System Call

Duration: 3 min

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Inside: a video lesson and guided study material.

Module outline

  1. Quantitative Aptitude: Ratio and Proportion (Ratios), Data Interpretation, Mixture and Alligation, Permutation and Combination, Number System, Sequence and Series (Series), Speed Time and Distance, Speed Mathematics and Basic Mathematics, Algebra, Percentage, Profit and Loss, Simple Interest and Compound Interest, Powers and Exponents (Surds and Indices), Time and Work, Mensuration and Geometry, Partnership
  2. Reasoning Ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Seating Arrangements, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Directions (Direction Test), Ranking, Order and Sequence, Syllogisms, Blood Relations, Puzzle Solving (Puzzles), Inequality, Machine Input-Output
  3. English Language: Vocabulary, Noun, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Construction, Pronoun, Preposition, Conjunction, Adverb, Verb, Modals, Articles, Determiner, Interjection
  4. General Awareness: Evolution of Indian Banking (Banking & Financial Awareness), GK- Current Affairs, Static General Knowledge, Indian Economy
  5. C Concepts + MCQs (IT Specialist): C Programming by Yash Sir, C Language Core
  6. Java (IT Specialist): Java
  7. Python (IT Specialist): Python for Placements by Yash Sir, Python Basics
  8. OOPs (IT Specialist): Object Oriented Programming (OOPS)
  9. DBMS (IT Specialist): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  10. SQL (IT Specialist): SQL
  11. Software Engineering (IT Specialist): Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  12. Data Structure (IT Specialist): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  13. Operating System (IT Specialist): Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  14. Compiler Design (IT Specialist): Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  15. Computer Architecture (IT Specialist): Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Multiprocessors, Programming the Basic Computer
  16. Data Communication & Networking (IT Specialist): Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security
  17. Descriptive Test (Main Exam): English Writing Ability
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The lecture introduces the fundamental concept of system calls within operating systems, defining them as the critical interface between user programs and the kernel. It explains that system calls provide the means for a user program to request services reserved for the operating system to perform on its behalf. The instructor details the role of the Application Programming Interface (API) in specifying available functions, parameters, and return values. The presentation then transitions to categorizing system calls into six major groups: process control, file manipulation, device manipulation, information maintenance, communications, and protection. Specific examples for process control and file management are provided to illustrate these categories, highlighting the practical application of these theoretical concepts in software development.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor begins by defining system calls using a slide titled 'System call'. He explains that system calls provide the means for a user program to ask the operating system to perform tasks on its behalf. The slide notes that these calls are generally routines written in C and C++. A diagram illustrates the flow from 'User Programs' through 'System Calls' to the 'Kernel' and finally 'Hardware'. The instructor emphasizes that the API specifies the set of functions available to programmers, including parameters and return values. He mentions common APIs like Windows API, POSIX API, and Java API, noting that the caller need only obey the API without knowing the implementation details. He highlights that the API is the interface to the services made available by the operating system.

  2. 2:00 – 2:58 02:00-02:58

    The lecture shifts to 'Types of System Calls', grouping them into six categories: process control, file manipulation, device manipulation, information maintenance, communications, and protection. The instructor focuses on 'Process control', listing examples such as end, abort, load, execute, create process, terminate process, and memory allocation. He then briefly shows a slide on 'File management', listing operations like create file, delete file, open, close, read, write, and reposition. This section provides concrete examples of how system calls are categorized based on the services they provide to the user program. The instructor uses checkmarks to indicate the items being discussed on the slide.

The video effectively bridges the gap between high-level programming concepts and low-level OS operations. By defining system calls as the essential interface and then categorizing them, the lecture provides a structured understanding of how user applications interact with the kernel. The progression from definition to API details to specific types (process control, file management) creates a comprehensive overview of system call mechanisms. This structured approach helps students understand the hierarchy and purpose of system calls in managing system resources.

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