topic Re: Socket buffer's size in MQX Software Solutions

Socket buffer's size

oscar — Fri, 04 May 2012 17:56:00 GMT

Hello,

I'm trying to increase the socket buffer's size with sectopt() function for a TCP server application

The issue is if the size is greater than 512, when I try to connect, no error is done but the accept() function is always waiting.

Otherwise, with size <= 512 is OK.

Some additional information:

- RTCS was built with RTCS_MINIMUM_FOOTPRINT (default)

Other parameters:

_RTCSPCB_init = 3;

_RTCS_msgpool_init = 3;

_RTCS_socket_part_init = 3;

Any idea?

Re: Socket buffer's size

drummer — Thu, 29 Oct 2020 09:05:12 GMT

I think you have it wrong. The fact that it sticks inside the accept is a good thing. If it gets out it means that an error occurred or the node on the other side has cancelled the session.

here's how I work it.

I recycle two handles because my host connection will occasionaly close the session and re-open another.

I am also making sure that the ip address of the node always remains the same as the original connection to prevent someone taking over the session.

  while(socket_flag == TRUE)    {    sock2 = accept(listensock, &raddr, &addr_length);    return_error_if(sock2 == RTCS_SOCKET_ERROR);    if(addr.sin_addr.s_addr == raddr.sin_addr.s_addr)    {     shutdown(sock, FLAG_CLOSE_TX);     fclose(sockfd);     sockfd = fopen("socket:", (char_ptr)sock2);     socket_flag = TRUE;    }    else    {     diag_led_red();     RTCS_time_delay(100);     continue;    }    sock = accept(listensock, &addr, &addr_length);    return_error_if(sock == RTCS_SOCKET_ERROR);    if(addr.sin_addr.s_addr == raddr.sin_addr.s_addr)    {     shutdown(sock2, FLAG_CLOSE_TX);     fclose(sockfd);     sockfd = fopen("socket:", (char_ptr)sock);     socket_flag = TRUE;    }    else    {     diag_led_grn();     RTCS_time_delay(100);     continue;    }           }//while(socket_flag == TRUE)

Re: Socket buffer's size

Weining — Tue, 08 May 2012 21:19:12 GMT

Have you checked if your memory overflows ?