[lwip-users] lwip_accept acceptmbox is NULL

[Emmanuel Baguia Jr.]

Hello! Good day! I recently use lwIP (port for win32) and found it useful for our project. But somehow, I needed some light. I have create a simple client/server application in which I use the APIs being introduced in lwip/sockets.h. Here are some code snippets from my server application:

 

s = lwip_socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

/* bind any port number */

memset(&localAddr, 0, sizeof(localAddr));

localAddr.sin_family = AF_INET;

localAddr.sin_addr.s_addr = INADDR_ANY;

localAddr.sin_port = htons(LOCAL_PORT);

error = bind(s, (struct sockaddr *) &localAddr, sizeof(localAddr));

if(error<0)

{

printf("ERROR: cannot bind port TCP %u\n",LOCAL_PORT);

}

error = listen(s, 10);

if( error == -1 )

{

return 1;

}

else

{

while( 1 )

{

if( accept( s, (struct sockaddr *) &localAddr, (u32_t *) &addr_len ) == -1 )

{

return 1;

}

}

}

 

My problem here is that the acceptmbox value is NULL inside the accept() function which will prompt to "invalid acceptmbox" assertion message. I have read some discussions that the acceptmbox is initialized in the lwip_listen() function which will eventually call the netconn_listen function. The same issue I got when using the APIs from the lwip/api.h. Here are some code snippets using the APIs:

 

struct netconn *conn, *newconn;

conn = netconn_new(NETCONN_TCP);

printf("http_test: socket created !\n");

netconn_bind(conn, NULL, 8084);

printf("http_test: socket binded !\n");

netconn_listen(conn);

printf("http_test: socket listen !\n");

// Where I placed the acceptmbox initialization

while( 1 )

{

newconn = netconn_accept(conn);

printf("http_test: socket accept !\n");

}

netconn_close(conn);

Until I noticed that I needed to initialize the acceptmbox if it is null after calling netconn_listen and before calling the netconn_accept.

if( conn->acceptmbox == NULL )

{

conn->acceptmbox = sys_mbox_new(DEFAULT_ACCEPTMBOX_SIZE);

}

 

Then everything worked! :) Is there a way to do this in the lwip/socket.h? Or maybe I just missed something?

 

Thank you very much.

 

Emmanuel