Function free_socket_locked

components/net/lwip/lwip-2.1.2/src/api/sockets.c:569–589

Free a socket (under lock) * * @param sock the socket to free * @param is_tcp != 0 for TCP sockets, used to free lastdata * @param conn the socekt's netconn is stored here, must be freed externally * @param lastdata lastdata is stored here, must be freed externally */

 * @param lastdata lastdata is stored here, must be freed externally
 */
static int
free_socket_locked(struct lwip_sock *sock, int is_tcp, struct netconn **conn,
                   union lwip_sock_lastdata *lastdata)
{
#if LWIP_NETCONN_FULLDUPLEX
  LWIP_ASSERT("sock->fd_used > 0", sock->fd_used > 0);
  sock->fd_used--;
  if (sock->fd_used > 0) {
    sock->fd_free_pending = LWIP_SOCK_FD_FREE_FREE | (is_tcp ? LWIP_SOCK_FD_FREE_TCP : 0);
    return 0;
  }
#else /* LWIP_NETCONN_FULLDUPLEX */
  LWIP_UNUSED_ARG(is_tcp);
#endif /* LWIP_NETCONN_FULLDUPLEX */

  *lastdata = sock->lastdata;
  sock->lastdata.pbuf = NULL;
  *conn = sock->conn;
  sock->conn = NULL;
  return 1;
}

/** Free a socket's leftover members.
 */