Hi all,
I'm working on a hardware control system on a BF548 via ethernet using UDP
using the lwIP stack. I tried to use ioctlsocket() to make the recv()
unblocking. However, when I use ioctlsocket(), i can't receive anything.
recv() keeps returning (-1) even if i try to send in a DOS attack ;). when
i'm operating in blocking mode, everything works fine. i'm in dire need of
help.. find my code below...
(note that for easy debugging I have made the code simple silly)
socket_fd = socket(AF_INET, SOCK_DGRAM, 0); // create socket
if ( socket_fd < 0 ) {
printf("socket call failed\n");
return;
}
memset(&sa, 0, sizeof(struct sockaddr_in));
ra.sin_family = AF_INET;
ra.sin_addr.s_addr = htonl(INADDR_ANY);
ra.sin_port = htons(RECEIVER_PORT_NUM);
if (bind(socket_fd, (struct sockaddr *)&ra, sizeof(struct
sockaddr_in)) == -1) // Bind the UDP socket to the port RECEIVER_PORT_NUM
{
printf("bind to port number %d ,IP address INADDR_ANY
failed\n",RECEIVER_PORT_NUM);
close(socket_fd);
return;
}
mode = 1;
ret = ioctlsocket(socket_fd, FIONBIO, &mode );
if(ret<0) printf("ioctlsocket() failed\n");
while(1)
{recv_data = recv(socket_fd,data_buffer1,sizeof(data_buffer1),0); //
This is silly i know. but still // returns -1
if(recv_data>0) break;}
printf("I got a packet\n");
printf("closing socket....\n");
close(socket_fd);
}
--
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