Somewhat ugly fix to deal with non-blocking sockets. We just loop and try

CURLcode add_buffer_send(int sockfd, struct connectdata *conn, send_buffer *in,

                         long *bytes_written)

{

  size_t amount;

  CURLcode result;

  ssize_t amount;

  CURLcode res;

  char *ptr;

  int size;

  if(conn->data->set.verbose) {

    fputs("> ", conn->data->set.err);

    fwrite(in->buffer, in->size_used, 1, conn->data->set.err);

  }

  result = Curl_write(conn, sockfd, in->buffer, in->size_used, &amount);

  /* The looping below is required since we use non-blocking sockets, but due

     to the circumstances we will just loop and try again and again etc */

  ptr = in->buffer;

  size = in->size_used;

  do {

    res = Curl_write(conn, sockfd, ptr, size, &amount);

    if(CURLE_OK != res)

      break;

    if(amount != size) {

      size += amount;

      ptr += amount;

    }

    else

      break;

  } while(1);

  if(in->buffer)

    free(in->buffer);

  *bytes_written = amount;

  return result;

  return res;

}