hi ,
I am using lwip (STABLE-1.3.2) in two different f/w with rtthreads on TI
luminary processor LM3S6965.
I am not able to restrict listen queue to zero ( I need only one active
connection on listening socket)
*1. using blocking api .* if i set MAXCLIENT = 0
if i set TCP_LISTEN_BACKLOG 0 , I can see 1 active connection and 8 in
queue , 9th connection is rejected.
if i set TCP_LISTEN_BACKLOG 1 , I can see 1 active connection and 1 in
queue.
I am passing MAXCLIENT for listen queue as follows
listen(server_socket, MAXCLIENT) == -1) // control the listen queue
accordingly note use : 0 for blocking 1 for non blocking f/w
---------------code snippet ---------------
#define MAXCLIENT 0 // only one active connection.
#define OFFLINE_PORT 5000 // listen on tcp 5000 port
if ((server_socket = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
!sock error handling !
}
/* Local Setting to receive connection
* initialize the server address (LM Module as Server)
*/
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(OFFLINE_PORT);
server_addr.sin_addr.s_addr = INADDR_ANY;
rt_memset(&(server_addr.sin_zero),8, sizeof(server_addr.sin_zero));
/* bind the connection on specified port to ANY Local IP address
* i.e bind the socket to server address
*/
if (bind(server_socket, (struct sockaddr *)&server_addr, sizeof(struct
sockaddr)) == -1)
{
/* Bind fails Error handling !
}
/* Listen on Socket
* Keep Server on listening mode
*/
if (listen(server_socket, MAXCLIENT) == -1)
{
// Listen error handling
}
while(1) // wait for connection
{
//save one level stack
sin_size = sizeof(struct sockaddr_in);
/* connection socket accepts a client request,
* this function call is a blocking type
*/
connected = accept(server_socket, (struct sockaddr *)&client_addr,
&sin_size);
/* returns a successful connection socket */
/* Accept the return of client addr point to client's address
information*/
rt_kprintf("\nI got a connection from (%s , %d)\n",
inet_ntoa(client_addr.sin_addr),ntohs(client_addr.sin_port));
while(1) // read and process responce from client until disconnected
or sock error
{
bytes_received = read_bytes_from_socket(connected,(unsigned char
*)&request_header.header,sizeof(request_header.header));
if(bytes_received <= 0)
{
lwip_close(connected);
break ; // get out of connected loop processing and wait for
next connection .
}
else
{
// process incomming data and respond to clients .
}
} // end while client connected
}// End while // wating for conection loop
---------------
*2. using non blocking api (select ,read ,write ) *
if i set TCP_LISTEN_BACKLOG 0 or 1, I still get 8 queue connections
Regards,
Mrutyunjay B Patel
Regards,
Mrutyunjay B Patel
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