Python: Find the parent’s process id, real user ID of the current process and change real user ID

Last update on April 02 2025 12:33:10 (UTC/GMT +8 hours)

8. Process and User ID Operations

Write a Python program to find the parent's process ID, real user ID of the current process and change the real user ID.

Sample Solution:

Python Code :

import os
print("Parent’s process id:",os.getppid())
uid = os.getuid()
print("\nUser ID of the current process:", uid)
uid = 1400
os.setuid(uid)
print("\nUser ID changed")
print("User ID of the current process:", os.getuid())

Sample Output:

Parent’s process id: 11069

User ID of the current process: 1000
Traceback (most recent call last):
  File "/tmp/sessions/caaafe2b92f1fb7d/main.py", line 6, in 
    os.setuid(uid)
PermissionError: [Errno 1] Operation not permitted

For more Practice: Solve these Related Problems:

• Write a Python program to retrieve and print the parent process ID and the real user ID of the current process using os.getppid() and os.getuid().
• Write a Python script to change the real user ID of the current process (if permissions allow) and then verify the change by printing the new user ID.
• Write a Python function that logs the current process ID, parent process ID, and real user ID, and then simulates a change in privileges.
• Write a Python program to compare the real and effective user IDs of the current process and print a message indicating if they differ.

Python Code Editor:

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