Python套接字（套接字错误坏文件描述符）

Question

The following receiveFile() function reads a filename and file data from the socket and splits it using the delimiter $ .

But I am unable to close the socket and a Bad file descriptor error is raised. If I comment out the self.server_socket.close() statement then there is no error but the socket is listening forever.

Code:-

def listen(self):
    self.server_socket.listen(10)
    while True:
        client_socket, address = self.server_socket.accept()
        print 'connected to', address
        self.receiveFile(client_socket)



def receiveFile(self,sock):
    data = sock.recv(1024)
    data = data.split("$");
    print 'filename', data[0]
    f = open(data[0], "wb")
    #data = sock.recv(1024)
    print 'the data is', data[1]
    f.write(data[1])
    data = sock.recv(1024)
    while (data):
        f.write(data)
        data=sock.recv(1024)
    f.close()
    self.server_socket.close()
    print 'the data is', data
    print "File Downloaded"

Traceback:-

Traceback (most recent call last):
  File "server.py", line 45, in <module>
    a = Server(1111)
  File "server.py", line 15, in __init__
    self.listen()
  File "server.py", line 20, in listen
    client_socket, address = self.server_socket.accept()
  File "c:\Python27\lib\socket.py", line 202, in accept
    sock, addr = self._sock.accept()
  File "c:\Python27\lib\socket.py", line 170, in _dummy
    raise error(EBADF, 'Bad file descriptor')
socket.error: [Errno 9] Bad file descriptor

Answer 1

You are closing the server's listening socket, and after that calling again accept() on it. To finish receiving one file you should close client connection's socket (sock in function receiveFile).

Answer 2

in this code i am trying to shut down the server once file is received

What you'll need is something to break out of the while True loop when you want to shut down the server. A simple solution would be to exploit the exception generated when you close the server socket...

def listen(self):
    self.server_socket.listen(10)
    while True:
        try:
            client_socket, address = self.server_socket.accept()
        except socket.error:
            break
        print 'connected to', address
        self.receiveFile(client_socket)
    print 'shutting down'