18 Questions
What happens when a process running a user program in user mode needs a system service?
It executes a trap instruction to transfer control to the operating system.
What is the mechanism used by a process to request a system service?
Trap instruction
In the context of system calls, what role does the operating system play?
Determines the requested service, carries out the request, and returns control to the calling process.
What is the purpose of a trap instruction in the context of system calls?
To transfer control from user mode to kernel mode.
How do C programs invoke system calls for requesting services?
By calling a library procedure with the same name as the system call.
What is the significance of return codes in system calls?
Return codes indicate the success or failure of a system call operation.
What is the purpose of system calls in an operating system?
To allow user-level programs to interact with the operating system's kernel
In the context of system calls, what is the role of the operating system's kernel?
To perform the requested service and return the result to the calling program
Which of the following is a typical service provided by system calls in operating systems?
File I/O operations
What role do system calls play in maintaining the security and stability of an operating system?
They provide a secure means for user-level programs to request services
When a user-level program makes a system call, how does the operating system's kernel respond?
By performing the requested service and returning the result to the program
Which programming language is commonly used to make system calls in user-level programs?
C
What keeps track of the number of directory entries pointing to a file in UNIX?
i-node field
In a monolithic system, what is responsible for invoking the requested service procedure?
Main program
What type of hypervisor is a practical type 2 hypervisor?
Pure type 2 hypervisor
Which OS structure involves separate user programs interacting with server programs over a network?
Client-server model
What is removed from the disk if UNIX detects no entries to the file?
Entire file system
What is the primary metric prefixes figure illustration in Tanenbaum's book referred to as?
Principal Metric Prefixes
Learn about system calls in operating systems, which act as an interface between user-level programs and the kernel. Explore how system calls allow programs to access essential services like file I/O, process management, and network communication.
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