Operating Systems Memory & IPC Concepts

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Questions and Answers

Which system call is used to create unidirectional data flow between processes?

  • chmod()
  • Pipe() (correct)
  • ilock()
  • chown()

The chmod() system call is used to change the ownership of a file or directory.

False (B)

What type of instructions can only be executed in kernel mode?

Privileged instructions

The ilock() system call is used to lock a specific range of memory, preventing it from being ______.

<p>swapped out</p> Signup and view all the answers

Match the following user types with their permissions:

<p>omnu = All permissions granted you = Limited permissions based on context others = Minimal permissions, typically read only</p> Signup and view all the answers

Flashcards

ilock() system call

Locks a specific range of memory, preventing it from being swapped out. Useful for performance-critical operations.

Pipe() system call

Creates a unidirectional data flow between processes, sending values from parent to child.

omnu user

A user type that represents the file owner. Has full control over the file.

Privileged Instructions

Instructions that have significant impact on the system, and are only executable in kernel mode.

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chown() system call

Changes the ownership of a file or directory, granting new user permissions.

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Study Notes

Memory System Calls

  • Control how memory is allocated or locked
  • mlock(): Locks a specific range of memory, preventing it from being swapped out
  • manlock(): Unlocks a range of memory previously locked by mlock()

Inter-Process Communication (IPC)

  • Pipe(): Creates unidirectional data flow between processes, sending values from parent to child process.

Changing File Permissions

  • chmod(): Changes permissions of a file or directory
  • Three types of users (owner, you, others)
  • Four read permissions (owner, group, other, others)

Dual Mode

  • Two types: user and kernel

  • Privileged instructions: Critical functions only executable in kernel mode

  • Initiate a context switch

  • Disable interrupts

  • Remove processes

  • Non-privileged instructions: Read system information; running involves kernel mode.

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