C++ session_free函数代码示例

void		session_delete(t_session *session)
{
  t_context	*context;
  t_session	*tmp;
  t_session	*tmp2;

  session_end(session);
  context = get_context_ptr((void *)0);
  VERBOSE(printf("\033[%d;1m<%03d> - session delete\033[m\n",
		 COLOR(session->id), session->id));
  tmp = context->sessions;
  if (tmp == session)
    {
      context->sessions = tmp->next;
      session_free(tmp);
      return ;
    }
  tmp2 = tmp;
  tmp = tmp->next;
  for (tmp2 = tmp, tmp = tmp->next; tmp && tmp != session;
       tmp = tmp->next, tmp2 = tmp2->next)
    ;
  if (tmp == session)
    {
      tmp2->next = tmp->next;
      session_free(tmp);
    }
  return ;
}

void
fe_close_window (struct session *sess)
{
    /*
     * There's really no point in doing all of this if the user is
     * quitting the app.  It makes it slow (as they watch individual
     * channels and servers disappear), and the OS is about to free
     * everything much more efficiently than we ever could.
     *
     * If we ever choose to run on Windows ME, this could be a problem :)
     */
    if (gui.quit) {
        session_free (sess);
        return;
    }

    navigation_tree_remove_session (gui.server_tree, sess);
    conversation_panel_remove_session (CONVERSATION_PANEL (gui.conversation_panel), sess);
    topic_label_remove_session (TOPIC_LABEL (gui.topic_label), sess);
    text_entry_remove_session (TEXT_ENTRY (gui.text_entry), sess);
    if (sess->type == SESS_SERVER) {
        status_bar_remove_server (STATUS_BAR (gui.status_bar), sess->server);
    }

    if (sess == gui.current_session) {
        gui.current_session = NULL;
    }

    session_free (sess);
}

/*
 * Handle socket events, such as connection failure or success.
 *   - BEV_EVENT_ERROR           - network is unreachable
 *   - BEV_EVENT_ERROR+READING   - connection refused or connection timed out
 *   - BEV_EVENT_TIMEOUT+READING - write timeout, if activated by
 *                                 bufferevent_set_timeouts
 */
static void
session_eventcb(struct bufferevent *bev, short what, void *thunk)
{
	struct session *session = thunk;
	switch (what & ~(BEV_EVENT_READING|BEV_EVENT_WRITING)) {
	case BEV_EVENT_CONNECTED:
		session_send(session);
		return;
	case BEV_EVENT_EOF:
		bufferevent_disable(bev, EV_READ|EV_WRITE);
		if (session->completed)
			target_mark(session->t, session->seq, '.');
		else
			target_mark(session->t, session->seq, '%');
		break;
	case BEV_EVENT_ERROR:
		bufferevent_disable(bev, EV_READ|EV_WRITE);
		target_mark(session->t, session->seq, '#');
		break;
	case BEV_EVENT_TIMEOUT:
		target_mark(session->t, session->seq, '?');
		break;
	}
	session_free(session);
}

/* Called from main context */
static void sink_input_kill(pa_sink_input* i) {
    struct session *s;
    pa_sink_input_assert_ref(i);
    pa_assert_se(s = i->userdata);

    session_free(s);
}

inline NSAPIEnvironment::~NSAPIEnvironment()
{
    // Tidy up the thread-specific "globals" for the next caller
    conf_reset_thread_globals();

    // Discard the request
    if (rq)
        request_free(rq);

    // Discard the session
    if (sn) {
        if (sn->csd && sn->csd_open)
            PR_Close(sn->csd);
        sn->csd_open = 0;
        session_free(sn);
    }

    // Restore the caller's pool.  session_free() set it to NULL
    if (poolCaller)
        systhread_setdata(keyPool, poolCaller);

    // This may have been a request thread.  If it was, we need to restore the
    // HttpRequest* for the thread-specific "globals".
    if (hrq) {
        HttpRequest::SetCurrentRequest(hrq);
        conf_set_thread_globals(hrq);
    }
    else {
        conf_set_thread_globals(threadHrq, threadVS);
    }
}

PRIVATE void signal_handler(int sig) {
  switch (sig) {
    case SIGINT:
    case SIGTERM: {
      dbg_printf(P_INFO2, "SIGTERM/SIGINT caught");
      closing = true;
      break;
    }
    case SIGHUP: {
      if(isRunning || !mySession) {
         seenHUP = true;
      } else {
         auto_handle * s = NULL;
         dbg_printf(P_MSG, "Caught SIGHUP. Reloading config file.");
         s = session_init();
         if((parse_config_file(s, AutoConfigFile) != 0) || !setupSession(s)) {
            dbg_printf(P_ERROR, "Error parsing config file. Keeping the old settings.");
            session_free(s);
         }

         seenHUP = false;
      }

      break;
    }
  }
}

static void
ssh_relay_event_cb(struct bufferevent *bev, short what, void *ptr)
{
	obfsproxyssh_client_session_t *session = ptr;
	struct evbuffer *buf;

	assert(bev == session->ssh_ev);

	if (what & (BEV_EVENT_EOF | BEV_EVENT_ERROR)) {
		session->ssh_is_valid = 0;
		libssh2_channel_free(session->ssh_channel);
		session->ssh_channel = NULL;
		libssh2_session_free(session->ssh_session);
		session->ssh_session = NULL;
		buf = bufferevent_get_output(session->socks_ev);
		if (0 == session->socks_is_valid || 0 ==
				evbuffer_get_length(buf))
			session_free(session);
		else {
			bufferevent_disable(session->socks_ev, EV_READ);
			bufferevent_setcb(session->socks_ev, NULL,
					socks_relay_teardown_cb,
					socks_event_cb, session);
		}
	}
}

static void on_disconnect(netc_t *netc)
{
	struct session *session;
	session = netc->ext_ptr;

	session_free(session);
}

/**
	@brief Free a transport_client, along with all resources it owns.
	@param client Pointer to the transport_client to be freed.
	@return 1 if successful, or 0 if not.  The only error condition is if @a client is NULL.
*/
int client_free( transport_client* client ) {
	if(client == NULL)
		return 0;
	session_free( client->session );
	client->session = NULL;
	return client_discard( client );
}

void obc_session_unref(struct obc_session *session)
{
	int refs;

	refs = __sync_sub_and_fetch(&session->refcount, 1);

	DBG("%p: ref=%d", session, refs);

	if (refs > 0)
		return;

	sessions = g_slist_remove(sessions, session);

	if (!session->obex)
		goto disconnect;

	/* Wait OBEX Disconnect to complete if command succeed otherwise
	 * proceed with transport disconnection since there is nothing else to
	 * be done */
	if (g_obex_disconnect(session->obex, disconnect_complete, session,
									NULL))
		return;

disconnect:
	/* Disconnect transport */
	if (session->id > 0 && session->transport != NULL) {
		session->transport->disconnect(session->id);
		session->id = 0;
	}

	session_free(session);
}

int session_mem_create(session_opt_t *so, request_t *rq, response_t *rs, 
        session_t **pss)
{
    session_t *ss = NULL;

    dbg_err_if (so == NULL);
    dbg_err_if (rq == NULL);
    dbg_err_if (rs == NULL);
    dbg_err_if (pss == NULL);

    ss = u_zalloc(sizeof(session_t));
    dbg_err_if(ss == NULL);

    ss->load = session_mem_load;
    ss->save = session_mem_save;
    ss->remove = session_mem_remove;
    ss->term = session_mem_term;
    ss->mtime = time(0);
    ss->so = so;

    dbg_err_if(session_prv_init(ss, rq, rs));

    *pss = ss;

    return 0;
err:
    if(ss)
        session_free(ss);
    return ~0;
}

static void
ssh_auth_cb(obfsproxyssh_client_session_t *session)
{
	obfsproxyssh_t *state = session->client->state;
	int rval;

	rval = libssh2_userauth_publickey(session->ssh_session,
			bdata(session->user),
			get_rsa_public_key(session->privkey),
			get_rsa_public_key_len(session->privkey),
			sign_with_private_key,
			&session->privkey);
	if (LIBSSH2_ERROR_EAGAIN == rval)
		return;
	else if (0 != rval) {
		log_f(state, "SSH: Error: %s Failed to authenticate - %d",
				bdata(session->ssh_addr), rval);
		libssh2_session_free(session->ssh_session);
		session->ssh_session = NULL;
		session_free(session);
		return;
	}

	session->libssh2_cb = ssh_channel_cb;
	session->libssh2_cb(session);
}

static void
socks_relay_teardown_cb(struct bufferevent *bev, void *ptr)
{
	obfsproxyssh_client_session_t *session = ptr;

	session_free(session);
}

// This callback is received whenever a session is closed.  The RISP session itself will be destroyed right after this callback exits.
void connclosed_cb(RISPSESSION streamsession, void *dataptr)
{
	assert(streamsession);
	assert(dataptr);
	
	maindata_t *maindata = dataptr;
	assert(maindata);
	assert(maindata->verify == 0xc001b33f);
	
	// we need to go through the list in maindata, to find this particular session.  When we have found it, we remove it.
	assert(maindata->sessions.list);
	assert(maindata->sessions.max > 0);
	
	fprintf(stderr, "Session Closed.  Finding in the list.  Max:%d\n", maindata->sessions.max);
	
	short found = 0; 
	for (int index=0; index < maindata->sessions.max; index++) {
		if (maindata->sessions.list[index]) {
			if (maindata->sessions.list[index]->session_ptr == streamsession) {
				// free the resources used by the session, and the session object itself.
				session_free(maindata->sessions.list[index]);
				
				// clear the entry in the list.
				maindata->sessions.list[index] = NULL;
				
				// we found the one we were looking for, so mark it, and exit the loop.
				found = 1;
				index = maindata->sessions.max;
			}
		} 
	}

	// we should have found one in that list.
	assert(found == 1);
}

/**
 * Free the memory associated with the session
 *
 * @param instance	The filter instance
 * @param session	The filter session
 */
static void
freeSession(FILTER *instance, void *session)
{
TEE_SESSION	*my_session = (TEE_SESSION *)session;
SESSION*	ses = my_session->branch_session;
session_state_t state;
#ifdef SS_DEBUG
skygw_log_write(LOGFILE_TRACE,"Tee free: %d", atomic_add(&debug_seq,1));
#endif
	if (ses != NULL)
	{
            state = ses->state;
            
		if (state == SESSION_STATE_ROUTER_READY)
		{
			session_free(ses);
		}
                else if (state == SESSION_STATE_TO_BE_FREED)
		{
			/** Free branch router session */
			ses->service->router->freeSession(
				ses->service->router_instance,
				ses->router_session);
			/** Free memory of branch client session */
			ses->state = SESSION_STATE_FREE;
			free(ses);
			/** This indicates that branch session is not available anymore */
			my_session->branch_session = NULL;
		}
                else if(state == SESSION_STATE_STOPPING)
                {
                    orphan_session_t* orphan;
                    if((orphan = malloc(sizeof(orphan_session_t))) == NULL)
                    {
                        skygw_log_write(LOGFILE_ERROR,"Error : Failed to "
                                "allocate memory for orphan session struct, "
                                "child session might leak memory.");
                    }else{
                        orphan->session = ses;
                        spinlock_acquire(&orphanLock);
                        orphan->next = allOrphans;
                        allOrphans = orphan;
                        spinlock_release(&orphanLock);
                    }
                }
	}
	if (my_session->dummy_filterdef)
	{
		filter_free(my_session->dummy_filterdef);
	}
        if(my_session->tee_replybuf)
            gwbuf_free(my_session->tee_replybuf);
	free(session);
        
	orphan_free(NULL);

        return;
}