Hi,
I ported lwIP to a Renesas H8/S CPU running a proprietary cooperative
multitasking O.S.
First tests were very positive and httpserver run properly.
Now I'm trying to use sockets but "lwip_connect" never return if it try
to connect to an inactive port.
I'm porting an FTP client, everything works fine if the FTP server is
running, but if the FTP server is stopped "lwip_connect" never returns.
I don't understand what I mistake.
I traced the execution and those are the relevant steps:
- (context: my SYS task) tcpip_apimsg post a message to execute do_connect
- (context: my SYS task) tcpip_apimsg wait for a signal on the semaphore
- (context: TCPIP task) message is fetched and do_connect is called
- (context: TCPIP task) do_connect calls tcp_connect that does NOT send
a signal on the semaphore, the signal will be sent from do_connected or
err_tcp (see comments in do_connect)
- (context: TCPIP task) destination is unreachable, and many retry are done
- (context: TCPIP task) err_tcp is called when the max retry number is
reached
- (context: TCPIP task) err_tcp calls execute the macro API_EVENT
because conn->recvmbox is not null
- (context: TCPIP task) API_EVENT calls event_callback
- (context: TCPIP task) event_callback calls sys_sem_wait and wait for a
signal on the semaphore
Then:
- task SYS is waiting for a signal (it should arrive from err_tcp)
- task TCPIP is waiting for a signal
Who is supposed to send the signal to TCPIP task?????
Many thanks,
Luca
This is what I do in my application:
// Spawn a task that initialize lwIP and dispatch ethernet packets
// Wait until lwIP is initialized
s = lwip_socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
return;
host.sin_family = AF_INET;
if (inet_aton("192.168.1.6",&host.sin_addr) == 0)
// close socket and return
host.sin_port = 21;
if (lwip_connect(s, (struct sockaddr *)&host, sizeof(host)) < 0)
// close socket and return
And those are my application traces (traces with capital TCPIP where
added by me)
TCP/IP initialized.
Applications started.
TPCIP: in tcpip_apimsg calling sys_arch_sem_wait (current task is sys)
tcpip_thread: API message 0x41f4c4
TCPIP: in tcp_apimsg exited from sys_arch_sem_wait
lwip_socket(PF_INET, SOCK_STREAM, 0) = 0
lwip_connect(0, addr=192.168.1.6 port=21)
TPCIP: in tcpip_apimsg calling sys_arch_sem_wait (current task is sys)
tcpip_thread: API message 0x41f4c0
tcpip: etharp_tmr()
tcpip: etharp_tmr()
tcpip: etharp_tmr()
TCPIP: in err_tcp
TCPIP: in err_tcp - calling API_EVENT in the first 'if' statement
(never exit)
TCPIP: in event_callback (conn=0x41b8dc, socket=0)
TCPIP: in event_callback - active task is tcpip
TCPIP: in event_callback - calling sys_sem_wait(selectsem) (never exit)
tcpip: etharp_tmr()
tcpip: etharp_tmr() .... a lot more follow
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