Hello again,
the Version I am using is V. 1.1.1
And the lwip_close function gets stuck exactly in the next piece of code
inside netconn_delete():
err_t
netconn_delete(struct netconn *conn)
{
...
/* Drain the recvmbox. */
if (conn->recvmbox != SYS_MBOX_NULL) {
while (sys_arch_mbox_fetch(conn->recvmbox, &mem, 1) !=
SYS_ARCH_TIMEOUT) {
if (conn->type == NETCONN_TCP) {
if(mem != NULL)
pbuf_free((struct pbuf *)mem);
} else {
netbuf_delete((struct netbuf *)mem);
}
} ->It does not get off the
while. It gets stuck, and if I stop the debugger I see that the execution
has gone along some other files reaching the
sys_mbox_free(conn->recvmbox); //main loop in tcpip.c.
conn->recvmbox = SYS_MBOX_NULL;
}
...
}
After seeing this, I think that what the lwip_close() function does is
close the socket gracefully getting blocked until the whole handshake has
been properly completed. Am I right??
If this is ok, is there any possibility of implementing a linger close?
Thank you very much for your attention.
Borja.
"Goldschmidt Simon" <[EMAIL PROTECTED]>
Enviado por: [EMAIL PROTECTED]
06/07/2007 12:32
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Mailing list for lwIP users <[email protected]>
Para
"Mailing list for lwIP users" <[email protected]>
cc
Asunto
RE: [lwip-users] Problem with lwip_close()
> I have been studying how to make a linger close of a socket in lwip.
> First of all, I have used the standard lwip_close() function as it is,
> an I have noticed that it gets stucked in the
"netconn_delete(sock->conn);"
> statement. I suppose that here it will wait for the closure handshake
to
> get completed or something like that.
>
That's strange. Can you tell us which version of lwIP you're using and
do
you know why it got stuck? (e.g. memory problems?)
> Later, I tried to see how to use the SO_LINGER option. And I saw that
this
> option is listed in sockets.h but I cannot find it in sockets.c. I had
a
> look in lwip_setsockopt(), but I did not find the SO_LINGER
definition.
> In addition, I saw that many other options are unimplemented. Then, my
> question is: Can a linger close be implemented under lwip?? How??
Usingo the
> SO_LINGER option in setsockopt ???
I don't know if I remember correctly, but I think the last SO_LINGER
implementation
wasn't working correctly and because of that, the code was removed.
I is one point of the lwIP todo-list to implement SO_LINGER, though.
Simon
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