Which of the following System calls are needed for process control?

The correct answer is Option 2) fork(), exit(), wait().

Key Points

• System calls related to process control are those that manage the creation, execution, and termination of processes.
• fork() – creates a new child process by duplicating the calling process.
• exit() – terminates the calling process and returns a status code to the parent process.
• wait() – makes the parent process wait until one of its child processes terminates.
• These calls are essential in multitasking operating systems for managing independent and related processes.

Additional Information

• Option 1 – Incorrect: open(), read(), write(), close() are file manipulation system calls.
• Option 3 – Incorrect: ioctl(), read(), write() are related to device and file control.
• Option 4 – Incorrect: getpid(), alarm(), sleep() are used for process information and timing, but not core process control.
• Process control system calls play a fundamental role in process creation, termination, synchronization, and status monitoring in operating systems like Unix/Linux.