Python | os.getsid() 方法

os.getsid() 方法在给定进程ID返回与该进程关联的组ID。它在Unix和Linux中可用。

语法

以下是os.getsid()方法的语法 -

os.getsid(pid)

参数

• pid - 用于检索会话ID的进程ID

返回值

os.getsid()方法返回给定进程ID的会话ID。

示例

以下示例演示如何使用os.getsid()方法 -

import os
import signal
import time

def signal_handler(signum, frame):
    print("Received signal:", signum)

# Fork a new process
pid = os.fork()

if pid == 0:
    # Child process
    print("Child process started.")
    # Get SID of child process
    sid = os.getsid(0)
    print("Child SID:", sid)
    # Wait for 30 seconds
    time.sleep(30)
    print("Child process completed.")
else:
    # Procese ID of the child process
    print("Parent process started with child process ID:", pid)
    # Wait for 5 seconds
    time.sleep(5)
    # Send signal to child process
    os.kill(pid, signal.SIGINT)
    print("Signal sent to child process.")
    # Wait for child process to complete
    os.waitpid(pid, 0)
    print("Parent process completed.")

输出：

Parent process started with child process ID: 12810
Child process started.
Child SID: 12810
Signal sent to child process.
Received signal: 2
Child process completed.
Parent process completed.

注意事项

• 由于os.getsid()方法只在Unix和Linux中可用，因此在Windows中不支持使用该方法。
• 如果提供了无效进程ID，则会引发OSError异常。