Mail Archives: cygwin/2011/01/30/09:32:00
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| Date: | Sun, 30 Jan 2011 15:31:44 +0100
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| Message-ID: | <AANLkTi=HunjC3MPZo37xZ8Yd1Mh1329yD5sQDfaNJWG9@mail.gmail.com>
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| Subject: | Issue with socket SO_REUSEADDR when a client is connected.
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| From: | jdzstz - gmail dot com <jdzstz AT gmail DOT com>
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--00163630fc05942714049b1128c5
Content-Type: text/plain; charset=ISO-8859-1
I have detected an issue in windows xp with socket SO_REUSEADDR when a
tcp client keeps connected forever.
I don't know if it is a cygwin bug or a problem with microsoft winsock
implementation. I don't know if windows vista or windows 7 has the
same behaviour.
I have a server process that open a socket and binds to a port. After
a while, it closes the socket, re-open and re-bind to it.
In Unix (linux, solaris) the server process can always re-bind after
closing the previous socket, but in cygwin, there are some strange
issues. I have prepared a simplified tcp_server test program, in order
to be able to reproduce error in an easy way.
A) If I bind to wildcard address 0.0.0.0 port 5555, it works
successfully, like Unix:
1) tcp_server binds to 0.0.0.0:5555 and create a thread to
accept connections
2) tcp_server sleep for 10 seconds
3) a client process connect to 127.0.0.1:5555 and keeps
connected forever
4) tcp_server awakes, closes all connections to port 5555
(but client process keeps port connected, in ESTABLISHED state)
5) tcp_server successfully reopens and rebind to 0.0.0.0:5555
B) If I bind to address 127.0.0.1 port 5555, it fails:
1) tcp_server binds to 127.0.0.1:5555 and create a thread
to accept connections
2) tcp_server sleep for 10 seconds
3) a client process connect to 127.0.0.1:5555 and keeps
connected forever
4) tcp_server awakes, closes all connections to port 5555
(but client process keeps port connected, in ESTABLISHED state)
5) an error "bind(): Address already in use" occurs.
C) If there is no client connection, rebind is always successful.
TEST LOG:
=========
A) bind to 0.0.0.0 5555
$ ./tcp_server 0.0.0.0 5555 10
Start main
Opening socket on 0.0.0.0 5555
Main: Creating thread
Start sleep
Starting server thread, executing "accept"
accepted fd 4
End sleep
pthread_cancel
Waiting for server
Server returned "0xffffffff"
End main
Start main
Opening socket on 0.0.0.0 5555
Main: Creating thread
Start sleep
Starting server thread, executing "accept"
End sleep
pthread_cancel
Waiting for server
Server returned "0xffffffff"
End main
Start main
Opening socket on 0.0.0.0 5555
B) bind to 127.0.0.1 5555
$ ./tcp_server 127.0.0.1 5555 10
Start main
Opening socket on 127.0.0.1 5555
Main: Creating thread
Starting server thread, executing "accept"
Start sleep
accepted fd 4
End sleep
pthread_cancel
Waiting for server
Server returned "0xffffffff"
End main
Start main
bind(): Address already in use
Main: Creating thread
Start sleep
Starting server thread, executing "accept"
Accepted failed: Bad file descriptor
Ending thread
End sleep
pthread_cancel
Waiting for server
close = 9 Bad file descriptor
End main
Start main
bind(): Address already in use
I attach to email a tcp_server and tcp_client examples. Execute
"./tcp_server 127.0.0.1 5555 10" in one terminal and "./tcp_client
127.0.0.1 5555" in other.
A telnet connection to tcp_server is also OK to see the problems.
This problem occurs sometimes in "varnishtest" tool from varnish
cache software.
--00163630fc05942714049b1128c5
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