s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((HOST, PORT))
s.listen(1)
any_connection = False
while True:
try:
conn, addr = s.accept()
data = conn.recv(1024)
any_connection = True
# keep looking
if not data: continue
pid = os.fork()
if pid == 0:
server_process(data, conn)
except KeyboardInterrupt:
break
if any_connection:
print("Closing connection")
conn.close()
I'm catching the KeyboardInterrupt
signal here on an infinite-running TCP server I wrote in Python. However, even though I know it is closing the connection because it prints Closing Connection
, when I try to re-run the server I get:
OSError: [Errno 48] Address already in use
I have no idea what's happening because I know for sure I'm calling conn.close()
.
And running killall python3
doesn't fix it, I keep getting the error unless I wait for a long time or change port. Also I tried to grep all python3
processes but I get nothing.
I'm running OS X Yosemite.
As per the docs the error OSError: [Errno 48] Address already in use
occurs because
the previous execution of your script has left the socket in a TIME_WAIT state, and can’t be immediately reused. This can be resolved by using the socket.SO_REUSEADDR
flag.
For eg:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((HOST, PORT))
You need to register a hook for this, something like:
#!/usr/bin/env python
import signal
import sys
def signal_handler(signal, frame):
# close the socket here
sys.exit(0)
signal.signal(signal.SIGINT, signal_handler)
来源:https://stackoverflow.com/questions/27360218/how-to-close-socket-connection-on-ctrl-c-in-a-python-programme