python socket.error: [Errno 9] Bad file descriptor

Question

I wanted to make a server and a client with Python. It was supposed to make multiple connections, one, where the server is sending something to the client, and one where the client is sending something to the server.

The first connection worked fine, but the second one crashed with the message:

socket.error: [Errno 9] Bad file descriptor

Here is the Server:

import socket
import errno
import pickle

def Main():
    host = '188.174.233.99'
    port = 66666

    all_text = ['text1', 'text2', 'text3']

    all_description = ['Test \n Description1\n', 'Test \n Description1\n', 'Test \n Description1\n']

    all_images = ['unlock.png', 'unlock.png', 'unlock.png']
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)
    s.bind((host, port))
    s.listen(1)


    while True:

        c, addr = s.accept()
        c.setblocking(0)

        print "Connection from: " + str(addr)


        command = c.recv(1024)

        if command == 'GIVEALL':
            textstring = pickle.dumps([all_text, all_images, all_description])#verwandelt Liste in String
            c.send(textstring)



        else:
            try:
                new_event = pickle.loads(command)
                print new_event
                caption = new_event[0]
                image = new_event[1]
                describtion = new_event[2]
                city = new_event[3]

            except:
                pass

        try:
            c.close()

            s.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
        except socket.error as e:
            if e.errno != errno.ECONNRESET:
                raise
            pass

if __name__ == '__main__':
    Main()

And here is the Client:

import socket import pickle

from kivy.properties import StringProperty
from kivy.properties import NumericProperty
from kivy.properties import ListProperty

class Netclient(object):

    def __init__(self):
        self.s = socket.socket()
        self.texte = []
        self.current = 'All'

        self.ip = '188.174.233.99'
        self.port = 66666

    def giveWid(self):
        print 'give Widgets executed'
        if self.current == 'All':
            self.texte, self.images, self.description = self.sentHOT(self.ip, self.port)

        return self.texte, self.images, self.description

    def sentHOT(self, host, port):

        self.s.connect((host, port))
        self.s.send('GIVEALL')#sends command

        recived_string = self.s.recv(1023)

        more_text = pickle.loads(recived_string)#verwandelt string in liste

        self.s.close()
        print 'closed'
        return more_text[0], more_text[1], more_text[2]


    def add_event(self, caption, image, description, city='Pawonkow'):
        new_event = [caption, image, description, city]
        new_compact_event = pickle.dumps(new_event)

        self.s.connect((self.ip, self.port))
        self.s.send(new_compact_event)

        self.s.close()


    n = Netclient()
    t, i, d = n.giveWid()
    print t
    n.add_event('new', 'new.png', 'ew event', 'Hanau')

Answer 1

The reason is that you are trying to reconnect a closed socket. You have to either create a new socket or reuse the old one as long as it's connected.

In method def sentHOT(...): comment the line self.s.close() and in method def add_event(...) comment the line self.s.connect((self.ip, self.port)) then should work. Further, please take a look at this tutorial, it helps you with socket programming.