Podcast
Questions and Answers
Which system call is used to create unidirectional data flow between processes?
Which system call is used to create unidirectional data flow between processes?
The chmod() system call is used to change the ownership of a file or directory.
The chmod() system call is used to change the ownership of a file or directory.
False
What type of instructions can only be executed in kernel mode?
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 ______.
The ilock() system call is used to lock a specific range of memory, preventing it from being ______.
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Match the following user types with their permissions:
Match the following user types with their permissions:
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Study Notes
Memory System Calls
- Control how memory is allocated or locked
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mlock(): Locks a specific range of memory, preventing it from being swapped out -
manlock(): Unlocks a range of memory previously locked bymlock()
Inter-Process Communication (IPC)
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Pipe(): Creates unidirectional data flow between processes, sending values from parent to child process.
Changing File Permissions
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chmod(): Changes permissions of a file or directory - Three types of users (owner, you, others)
- Four read permissions (owner, group, other, others)
Dual Mode
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Two types: user and kernel
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Privileged instructions: Critical functions only executable in kernel mode
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Initiate a context switch
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Disable interrupts
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Remove processes
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Non-privileged instructions: Read system information; running involves kernel mode.
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Description
This quiz covers essential concepts of operating systems, including memory system calls, inter-process communication, changing file permissions, and the dual mode of operations. Test your knowledge on how these elements help manage processes and memory allocation effectively.
