OS module in Python provides functions for interacting with the operating system. OS comes under Python’s standard utility modules. This module provides a portable way of using operating system dependent functionality.
All functions in os module raise OSError in the case of invalid or inaccessible file names and paths, or other arguments that have the correct type, but are not accepted by the operating system.
os.setreuid() method in Python is used to set the current process’s real and effective user ids.
Every user in Unix like operating system is identified by different integer number, this unique number is called as UserID. Real UserID represents account of the owner of the process. It defines which files that this process has access to. Effective UserID is normally same as Real UserID, but sometimes it is changed to enable a non-privileged user to access files that can only be accessed by root.
os.setreuid() method is only available on UNIX platforms and functionality of this method is typically available only to the superuser.
Superuser means a root user or an administrative user who has all the permissions to run or execute any program in the operating system.
Syntax: os.setreuid(ruid, euid)
ruid: An integer value representing new user id for the current process.
euid: An integer value representing new effective user id for the current process.
Return Type: This method does not return any value.
Real user id of the current process: 0 Effective user id of the current process: 0 Real and effective user ids changed Real user id of the current process: 100 Effective user id of the current process: 200
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