Re: [lwip-users] invalid recvmbox in UDP recv() function

[gussabina]

Ok. But TCP sockets works fine...Below is the code I'm using for TCP receive.

Actually, in below code I'm using select() to wait for receive data...Now
I'm confused...Should I use same approach for UDP?

Thanks;
Gus

/int SocketRead(void *context, byte* buf, int buf_len, int timeout_ms)
{
        
    SocketContext *sock = (SocketContext*)context;
    int rc = -1, timeout = 0;
    SOERROR_T so_error = 0;
    fd_set recvfds;
    fd_set errfds;
    struct timeval tv;

    if (context == NULL || buf == NULL || buf_len <= 0) {
        return ERROR_BAD_ARG;
    }

    sock->bytes = 0;
        
    // Setup timeout and FD's 
    setup_timeout(&tv, timeout_ms);
    FD_ZERO(&recvfds);
    FD_SET(sock->fd, &recvfds);
    FD_ZERO(&errfds);
    FD_SET(sock->fd, &errfds);

    // Loop until buf_len has been read, error or timeout 
    while (sock->bytes < buf_len) {

        // Wait for rx data to be available 
        rc = select((int)SELECT_FD(sock->fd), &recvfds, NULL, &errfds, &tv);
        if (rc > 0)
        {
            // Check if rx or error 
            if (FD_ISSET(sock->fd, &recvfds)) {

                // Try and read number of buf_len provided,
                //    minus what's already been read 
                rc = (int)SOCK_RECV(sock->fd, &buf[sock->bytes], buf_len -
sock->bytes, 0);
                if (rc <= 0) {
                    rc = -1;
                    goto exit; // Error 
                }
                else {
                    sock->bytes += rc; // Data
                }

            }
            if (FD_ISSET(sock->fd, &errfds)) {
                rc = -1;
                break;
            }
        }
        else {
            timeout = 1;
            break; // timeout or signal 
        }
    } // while 

exit:

    if (rc == 0 && timeout) {
        rc = ERROR_TIMEOUT;
    }
    else if (rc < 0) {
        // Get error
        socklen_t len = sizeof(so_error);
        getsockopt(sock->fd, SOL_SOCKET, SO_ERROR, &so_error, &len);

        if (so_error == 0) {
            rc = 0; // Handle signal 
        }
        else {
            rc = ERROR_NETWORK;
            PRINTF("NetRead: Error %d", so_error);
        }
    }
    else {
        rc = sock->bytes;
    }
    sock->bytes = 0;
    return rc;
}
/




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