003.03.94.Interview-Questions-Process-Duplication - EmbLogic

20. Example Scenario of `fork()` Execution

pravjot — Wed, 29 May 2024 23:51:00 +0530

20. Example Scenario of `fork()` Execution

Using a simple C program that calls `fork()`, explain the sequence of events that occurs from the parent process calling `fork()` to both the parent and child processes continuing execution.

19. Returning to User Mode

pravjot — Wed, 29 May 2024 23:50:46 +0530

19. Returning to User Mode

Describe the process by which the kernel returns control to user mode after setting up the child process context during `fork()`. What specific adjustments are made?

18. Function `copy_thread()`

pravjot — Wed, 29 May 2024 23:31:27 +0530

18. Function `copy_thread()`

What is the purpose of the `copy_thread()` function in the `fork()` system call? What key tasks does it perform?

17. System Call Entry and Handling

pravjot — Wed, 29 May 2024 23:31:12 +0530

17. System Call Entry and Handling

Outline the steps that occur when the `fork()` system call is invoked, focusing on the transition from user mode to kernel mode.

16. Initialization of `task_struct`

pravjot — Wed, 29 May 2024 23:30:58 +0530

16. Initialization of `task_struct`

What is the `task_struct`, and what role does it play in process management? How is it initialized for the child process during `fork()`?

15. Handling Special Registers

pravjot — Wed, 29 May 2024 23:27:33 +0530

15. Handling Special Registers

How does the kernel manage special registers (e.g., FPU, SIMD) when setting up the child process context during `fork()`? Why is this important?

14. Stack Pointer Initialization

pravjot — Wed, 29 May 2024 23:27:18 +0530

14. Stack Pointer Initialization

Describe how the stack pointer (SP) is handled during the `fork()` system call. Why is it crucial for maintaining process execution context?

13. Program Counter Adjustment

pravjot — Wed, 29 May 2024 23:27:04 +0530

13. Program Counter Adjustment

How does the kernel adjust the program counter (PC) for the child process during `fork()`? Why is this step necessary?

12. Return Values of `fork()`

pravjot — Wed, 29 May 2024 23:21:45 +0530

12. Return Values of `fork()`

Explain how the return values of `fork()` differ for the parent and child processes. Why is this differentiation important?

11. Process Context Duplication

pravjot — Wed, 29 May 2024 23:21:33 +0530

11. Process Context Duplication

What elements constitute the context of a process in Linux, and how does the kernel duplicate this context for the child process during the `fork()` system call?

10. Close-on-Exec Flags Management

pravjot — Wed, 29 May 2024 23:21:21 +0530

10. Close-on-Exec Flags Management

Explain the `FD_CLOEXEC` flag. How does the kernel manage this flag for file descriptors during the `fork()` operation?

9. Special Handling of File Descriptors

pravjot — Wed, 29 May 2024 23:15:44 +0530

9. Special Handling of File Descriptors

How does the kernel handle special file descriptors, such as sockets or pipes, during the `fork()` system call?

8. File Descriptor Table (`files_struct`)

pravjot — Wed, 29 May 2024 23:15:30 +0530

8. File Descriptor Table (`files_struct`)

What is the `files_struct` in the context of the `fork()` system call? What are the key fields in this structure?

7. Consistency in File Operations

pravjot — Wed, 29 May 2024 23:15:17 +0530

7. Consistency in File Operations

How does sharing the `file` structure and managing reference counts ensure consistency in file operations between the parent and child processes?

6. Reference Count Management

pravjot — Wed, 29 May 2024 23:12:10 +0530

6. Reference Count Management

Why does the kernel increment the reference count for each `file` structure during the `fork()` operation? How does this ensure proper resource management?

5. Duplicating File Descriptor Table

pravjot — Wed, 29 May 2024 23:11:56 +0530

5. Duplicating File Descriptor Table

When a process calls `fork()`, how does the kernel handle the duplication of the file descriptor table for the child process?

4. Inode Table

pravjot — Wed, 29 May 2024 23:11:43 +0530

4. Inode Table

Explain the purpose of the inode table in Linux. What kind of metadata does it store about files?

3. System-Wide File Table

pravjot — Wed, 29 May 2024 23:02:55 +0530

3. System-Wide File Table

What is the file table, and how does it differ from the file descriptor table? What kind of information is stored in the file table?

2. File Descriptor Table

pravjot — Wed, 29 May 2024 23:02:41 +0530

2. File Descriptor Table

Describe the file descriptor table in a Linux process. What role does it play during the `fork()` system call?

1. Understanding File Descriptors

pravjot — Wed, 29 May 2024 23:02:25 +0530

1. Understanding File Descriptors

What are file descriptors in the context of Linux operating systems, and what types of resources can they reference?