SCTP Simple Mode Server failed to Close SCTPListener

[xp0inter]

SCTP Simple Mode Server failed to Close SCTPListener if start AcceptSCTP but no request coming in.

	ln, err := sctp.ListenSCTP("sctp4",
		syscall.SOCK_STREAM,
		sctp_addr,
		&sctp.SCTPInitMsg{
			NumOutStreams:  0xffff,
			MaxInStreams:   0,
			MaxAttempts:    0,
			MaxInitTimeout: 0,
		},
	)
        if err != nil {
		...
	}
        defer ln.Close()
       
       // After  AcceptSCTP(), it will Block. If there is no request coming in ,
      // run ln.Close(), it won' work if the process not exists.
      // when I try to re-listen same port, it will show the address already been used.
       conn, err := ln.AcceptSCTP()  
       if err != nil {
       ...      
       }

Here is the example

After AcceptSCTP I run closed keep the process run...

Meanwhile I re-listen the same port , it shows Error: address already in use

Do you have any ideas about this problem? Thank you very much !

[thebagchi]

Investigating

[linouxis9]

Any updates / ideas? @thebagchi
@xp0inter Were you able to find a workaround?
Thanks a lot :-)

[thebagchi]

Reading through the kernel docs for close.
I understand calling close on a socket has no effect on active system calls on that socket, if they are being done on separate thread.
Refer:
http://www.kernel.org/doc/man-pages/online/pages/man2/close.2.html

[thebagchi]

Work around would be to use epoll.
Please refer to epoll example. It can be used for seq_packet as well.

[linouxis9]

Thanks a lot for the doc reference! @thebagchi