Programming Forums > Script Programming > Python

terron · Mar 28th, 2008, 11:13 AM

I'm trying to make something that once it is disconnected will automatically try to reconnect. I'll add some more features in later so it doesn't hammer the server but right now I just want to keep it simple and get that part working. The problem is that when I use sock.close I get an error message of

(Toggle Plain Text)

Bad File Descriptor

and if I either use shutdown or just go straight to reconnecting I get:

(Toggle Plain Text)

Transport endpoint is already connected

This is what I've got right now:

 python Syntax (Toggle Plain Text) 
#! /usr/bin/env python
import socket, string
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
def doconn():
    sock.connect(("localhost", 1234))
def dodiscon():
    sock.close()
    doconn()
 
doconn()
 
while (1):
    buffer = sock.recv(1024)
    if not buffer:
        dodiscon()
#! /usr/bin/env python
import socket, string
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
def doconn():
    sock.connect(("localhost", 1234))
def dodiscon():
    sock.close()
    doconn()

doconn()

while (1):
    buffer = sock.recv(1024)
    if not buffer:
        dodiscon()

What am I doing wrong?

Freaky Chris · Mar 28th, 2008, 12:17 PM

Hmm well i think you may find it is because when you call socket.close()
your socket becomes blank so to speak.

 Python Syntax (Toggle Plain Text) 
#! /usr/bin/env python
import socket, string
 
def doconn():
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.connect(("localhost", 1234))
def dodiscon():
    sock.close()
    doconn()
 
doconn()
 
while (1):
    buffer = sock.recv(1024)
    if not buffer:
        dodiscon()
#! /usr/bin/env python
import socket, string

def doconn():
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.connect(("localhost", 1234))
def dodiscon():
    sock.close()
    doconn()

doconn()

while (1):
    buffer = sock.recv(1024)
    if not buffer:
        dodiscon()

and so by moving the declaration of your socket into your doconn() function everytime you try to connect it re-defines the socket.

I thinks this works anyway plus i've no doubt been talking aload of rubbish but there we go

Chris

Jimbo · Mar 29th, 2008, 3:39 AM

When you close the socket, it'll be closed. You can reconnect with a new socket, but you can't use the same one. When it's closed, both OSs will terminate the connection.

Freaky Chris · Mar 29th, 2008, 5:12 AM

Quote:

Originally Posted by Jimbo

When you close the socket, it'll be closed. You can reconnect with a new socket, but you can't use the same one. When it's closed, both OSs will terminate the connection.

thats what i was trying to say but just couldn't lol thanks Jimbo

Mar 28th, 2008, 11:13 AM	#1
terron Newbie Join Date: Mar 2008 Posts: 1 Rep Power: 0	How do I reconnect a disconnected socket? I'm trying to make something that once it is disconnected will automatically try to reconnect. I'll add some more features in later so it doesn't hammer the server but right now I just want to keep it simple and get that part working. The problem is that when I use sock.close I get an error message of (Toggle Plain Text) Bad File Descriptor Bad File Descriptor and if I either use shutdown or just go straight to reconnecting I get: (Toggle Plain Text) Transport endpoint is already connected Transport endpoint is already connected This is what I've got right now: python Syntax (Toggle Plain Text) #! /usr/bin/env python import socket, string sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) def doconn(): sock.connect(("localhost", 1234)) def dodiscon(): sock.close() doconn() doconn() while (1): buffer = sock.recv(1024) if not buffer: dodiscon() #! /usr/bin/env python import socket, string sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) def doconn(): sock.connect(("localhost", 1234)) def dodiscon(): sock.close() doconn() doconn() while (1): buffer = sock.recv(1024) if not buffer: dodiscon() What am I doing wrong?

Mar 28th, 2008, 12:17 PM	#2
Freaky Chris Professional Programmer Join Date: Dec 2007 Location: England Posts: 445 Rep Power: 1	Re: How do I reconnect a disconnected socket? Hmm well i think you may find it is because when you call socket.close() your socket becomes blank so to speak. Python Syntax (Toggle Plain Text) #! /usr/bin/env python import socket, string def doconn(): sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect(("localhost", 1234)) def dodiscon(): sock.close() doconn() doconn() while (1): buffer = sock.recv(1024) if not buffer: dodiscon() #! /usr/bin/env python import socket, string def doconn(): sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect(("localhost", 1234)) def dodiscon(): sock.close() doconn() doconn() while (1): buffer = sock.recv(1024) if not buffer: dodiscon() and so by moving the declaration of your socket into your doconn() function everytime you try to connect it re-defines the socket. I thinks this works anyway plus i've no doubt been talking aload of rubbish but there we go Chris __________________ Steven Skiena - Algorithms `,[->+>+<<]>>[-<<+>>]>++++++++[-<++++++++>]<+[-<->]>+<<[[-]+++++++++++++++.[-]>]>>[+++++++++.[-]],` brainf**k -- It's such a pretty language

Mar 29th, 2008, 3:39 AM	#3
Jimbo Battle Programmer Join Date: Feb 2006 Location: Bellevue, WA, USA Posts: 770 Rep Power: 3	Re: How do I reconnect a disconnected socket? When you close the socket, it'll be closed. You can reconnect with a new socket, but you can't use the same one. When it's closed, both OSs will terminate the connection. __________________ <insert disclaimer here> <insert shameless plug for Visual Studio here>

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Programming Forums > Script Programming > Python

How do I reconnect a disconnected socket?