Question

我想知道有没有办法找出打开的套接字然后关闭它？

例如，我有一个脚本＆＃34; SendInfo.py＆＃34;它打开一个套接字并通过TCP发送一些信息。

如果我调用此脚本来运行它，例如＆＃34; python SendInfo.py＆＃34; ，它会打开一个新的插座。

如果我使用＆＃34; python SendInfo.py＆＃34;再次运行此脚本，它将发送一些更新的信息，我想取消之前的TCP事务并开始一个新事务 - 例如通过关闭前一个套接字。

如何在脚本开头访问打开的套接字才能关闭它？我试过调查线程，但我同样对哪些线程是开放的以及如何关闭开放线程等感到困惑。

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.settimeout(2)
s.connect((self.__host, PORT))

Answer 1

我不确定这是否是你所追求的，但这里有一种确保脚本只运行一次并杀死现有运行脚本的方法。
你可能会发现一些有用的东西。（这适用于Linux）

#!/usr/bin/python
# running.py
# execute by making the script executable
# put it somewhere on $PATH and execute via running.py 
# or execute via ./running.py
import os, sys, time , signal, socket
running_pid = os.popen('ps --no-headers -C running.py').read(5)
try:
    running_pid = int(running_pid)
except:
    running_pid = 0
current_pid = int(os.getpid())
if running_pid != 0:
    if running_pid != current_pid:
        print "Already running as process", running_pid
        print "Killing process", running_pid
        os.kill(int(running_pid), signal.SIGKILL)
#        sys.exit()
# Create a listening socket for external requests
tcp_port = 5005
try:
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
except:
    print "Error on Socket 5005"

# force re-use of the socket if it is in time-out mode after being closed
# other wise we can get bind errors after closing and attempting to start again
# within a minute or so
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

try:
    sock.settimeout(0.10)
    sock.bind(("localhost", tcp_port))
except IOError as msg:
    print "Error on Socket Bind "+str(tcp_port)+", running.py is probably already running"
    pass
try:
    sock.listen((1))
except:
    print "Error on Socket listen"

time.sleep(60)
sock.close()

在python中关闭打开的套接字

1 个答案: