During which of the following operations systems calls would be made?
(a) Creation of file
(b) Writing characters to file
(c) Reading characters from file
(d) Deleting file

The correct answer is Option 3.

Key Points

• System calls are the interface between a process and the operating system. They allow processes to request services such as file manipulation, memory allocation, and process control.
• During the following operations, system calls are made:
  • Creation of file: A system call is made to allocate resources and create a file in the file system.
  • Writing characters to file: System calls are used to write data to a file, ensuring the data is stored correctly in the file system.
  • Reading characters from file: System calls are required to retrieve data from a file stored in the system.
  • Deleting file: A system call is made to remove the file from the file system and deallocate associated resources.
• Since all operations listed (a, b, c, and d) involve interaction with the operating system through system calls, the correct answer is Option 3.

Additional Information

• System calls are essential for process communication with the operating system.
• They provide a controlled interface for requesting resources or services without direct access to kernel-level functionalities.
• Examples of system calls include open(), read(), write(), and close().
• Using system calls ensures security and stability, as the operating system validates and processes requests appropriately.
• System calls may vary between operating systems (e.g., Linux, Windows), but their purpose remains consistent.