Python | os.getresuid() 和 os.setresuid() 方法

The os module in Python provides various functions that allow interaction with the operating system. Two such functions are os.getresuid() and os.setresuid(), which are used to get and set the real, effective, and saved user IDs of the current process.

os.getresuid()

The os.getresuid() function returns a tuple containing the real, effective, and saved user IDs of the current process. These three IDs are integers that represent the user IDs used by the operating system for access control.

Syntax

os.getresuid()

Returns

A tuple containing the real, effective, and saved user IDs.

Example

import os

# get the real, effective, and saved user IDs
ruid, euid, suid = os.getresuid()

print("Real User ID:", ruid)
print("Effective User ID:", euid)
print("Saved User ID:", suid)

Output:

Real User ID: 1000
Effective User ID: 1000
Saved User ID: 1000

os.setresuid(uid, euid, suid)

The os.setresuid() function sets the real, effective, and saved user IDs of the current process to the specified values.

Syntax

os.setresuid(uid, euid, suid)

Parameters

• uid - The new real user ID.
• euid - The new effective user ID.
• suid - The new saved user ID.

Example

import os

# get the real, effective, and saved user IDs
ruid, euid, suid = os.getresuid()

print("Before setting the user IDs:")
print("Real User ID:", ruid)
print("Effective User ID:", euid)
print("Saved User ID:", suid)

# set the user IDs
os.setresuid(1001, 1001, 1001)

# get the user IDs again
ruid, euid, suid = os.getresuid()

print("\nAfter setting the user IDs:")
print("Real User ID:", ruid)
print("Effective User ID:", euid)
print("Saved User ID:", suid)

Output:

Before setting the user IDs:
Real User ID: 1000
Effective User ID: 1000
Saved User ID: 1000

After setting the user IDs:
Real User ID: 1001
Effective User ID: 1001
Saved User ID: 1001

In the above example, the os.setresuid() function is used to set the real, effective, and saved user IDs of the current process to 1001. The os.getresuid() function is then used to verify that the user IDs were successfully set.