+++ /dev/null
-/*
- * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License, version 2 only, as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#define _GNU_SOURCE
-#include <assert.h>
-
-#include <common/common.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-#include <common/uri.h>
-#include <common/utils.h>
-
-#include <common/compat/endian.h>
-
-#include "fd-limit.h"
-#include "jul-thread.h"
-#include "lttng-sessiond.h"
-#include "session.h"
-#include "utils.h"
-
-/*
- * Note that there is not port here. It's set after this URI is parsed so we
- * can let the user define a custom one. However, localhost is ALWAYS the
- * default listening address.
- */
-static const char *default_reg_uri =
- "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS;
-
-/*
- * Update JUL application using the given socket. This is done just after
- * registration was successful.
- *
- * This is a quite heavy call in terms of locking since the session list lock
- * AND session lock are acquired.
- */
-static void update_jul_app(int sock)
-{
- struct ltt_session *session, *stmp;
- struct ltt_session_list *list;
-
- list = session_get_list();
- assert(list);
-
- session_lock_list();
- cds_list_for_each_entry_safe(session, stmp, &list->head, list) {
- session_lock(session);
- if (session->ust_session) {
- jul_update(&session->ust_session->domain_jul, sock);
- }
- session_unlock(session);
- }
- session_unlock_list();
-}
-
-/*
- * Destroy a JUL application by socket.
- */
-static void destroy_jul_app(int sock)
-{
- struct jul_app *app;
-
- assert(sock >= 0);
-
- /*
- * Not finding an application is a very important error that should NEVER
- * happen. The hash table deletion is ONLY done through this call even on
- * thread cleanup.
- */
- rcu_read_lock();
- app = jul_find_app_by_sock(sock);
- assert(app);
- rcu_read_unlock();
-
- /* RCU read side lock is taken in this function call. */
- jul_delete_app(app);
-
- /* The application is freed in a RCU call but the socket is closed here. */
- jul_destroy_app(app);
-}
-
-/*
- * Cleanup remaining JUL apps in the hash table. This should only be called in
- * the exit path of the thread.
- */
-static void clean_jul_apps_ht(void)
-{
- struct lttng_ht_node_ulong *node;
- struct lttng_ht_iter iter;
-
- DBG3("[jul-thread] Cleaning JUL apps ht");
-
- rcu_read_lock();
- cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, node, node) {
- struct jul_app *app;
-
- app = caa_container_of(node, struct jul_app, node);
- destroy_jul_app(app->sock->fd);
- }
- rcu_read_unlock();
-}
-
-/*
- * Create and init socket from uri.
- */
-static struct lttcomm_sock *init_tcp_socket(void)
-{
- int ret;
- struct lttng_uri *uri = NULL;
- struct lttcomm_sock *sock = NULL;
-
- /*
- * This should never fail since the URI is hardcoded and the port is set
- * before this thread is launched.
- */
- ret = uri_parse(default_reg_uri, &uri);
- assert(ret);
- assert(jul_tcp_port);
- uri->port = jul_tcp_port;
-
- sock = lttcomm_alloc_sock_from_uri(uri);
- uri_free(uri);
- if (sock == NULL) {
- ERR("[jul-thread] JUL allocating TCP socket");
- goto error;
- }
-
- ret = lttcomm_create_sock(sock);
- if (ret < 0) {
- goto error;
- }
-
- ret = sock->ops->bind(sock);
- if (ret < 0) {
- WARN("Another session daemon is using this JUL port. JUL support "
- "will be deactivated to prevent interfering with the tracing.");
- goto error;
- }
-
- ret = sock->ops->listen(sock, -1);
- if (ret < 0) {
- goto error;
- }
-
- DBG("[jul-thread] Listening on TCP port %u and socket %d", jul_tcp_port,
- sock->fd);
-
- return sock;
-
-error:
- if (sock) {
- lttcomm_destroy_sock(sock);
- }
- return NULL;
-}
-
-/*
- * Close and destroy the given TCP socket.
- */
-static void destroy_tcp_socket(struct lttcomm_sock *sock)
-{
- assert(sock);
-
- DBG3("[jul-thread] Destroy TCP socket on port %u", jul_tcp_port);
-
- /* This will return gracefully if fd is invalid. */
- sock->ops->close(sock);
- lttcomm_destroy_sock(sock);
-}
-
-/*
- * Handle a new JUL registration using the reg socket. After that, a new JUL
- * application is added to the global hash table and attach to an UST app
- * object. If r_app is not NULL, the created app is set to the pointer.
- *
- * Return the new FD created upon accept() on success or else a negative errno
- * value.
- */
-static int handle_registration(struct lttcomm_sock *reg_sock,
- struct jul_app **r_app)
-{
- int ret;
- pid_t pid;
- ssize_t size;
- struct jul_app *app;
- struct jul_register_msg msg;
- struct lttcomm_sock *new_sock;
-
- assert(reg_sock);
-
- new_sock = reg_sock->ops->accept(reg_sock);
- if (!new_sock) {
- ret = -ENOTCONN;
- goto error;
- }
-
- size = new_sock->ops->recvmsg(new_sock, &msg, sizeof(msg), 0);
- if (size < sizeof(msg)) {
- ret = -errno;
- goto error_socket;
- }
- pid = be32toh(msg.pid);
-
- DBG2("[jul-thread] New registration for pid %d on socket %d", pid,
- new_sock->fd);
-
- app = jul_create_app(pid, new_sock);
- if (!app) {
- ret = -ENOMEM;
- goto error_socket;
- }
-
- /*
- * Add before assigning the socket value to the UST app so it can be found
- * concurrently.
- */
- jul_add_app(app);
-
- /*
- * We don't need to attach the JUL app to the app. If we ever do
- * so, we should consider both registration order of JUL before
- * app and app before JUL.
- */
-
- if (r_app) {
- *r_app = app;
- }
-
- return new_sock->fd;
-
-error_socket:
- new_sock->ops->close(new_sock);
- lttcomm_destroy_sock(new_sock);
-error:
- return ret;
-}
-
-/*
- * This thread manage application notify communication.
- */
-void *jul_thread_manage_registration(void *data)
-{
- int i, ret, pollfd;
- uint32_t revents, nb_fd;
- struct lttng_poll_event events;
- struct lttcomm_sock *reg_sock;
-
- DBG("[jul-thread] Manage JUL application registration.");
-
- rcu_register_thread();
- rcu_thread_online();
-
- /* JUL initialization call MUST be called before starting the thread. */
- assert(jul_apps_ht_by_sock);
-
- /* Create pollset with size 2, quit pipe and socket. */
- ret = sessiond_set_thread_pollset(&events, 2);
- if (ret < 0) {
- goto error_poll_create;
- }
-
- reg_sock = init_tcp_socket();
- if (!reg_sock) {
- goto error_tcp_socket;
- }
-
- /* Add create valid TCP socket to poll set. */
- ret = lttng_poll_add(&events, reg_sock->fd,
- LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
- while (1) {
- DBG3("[jul-thread] Manage JUL polling on %d fds",
- LTTNG_POLL_GETNB(&events));
-
- /* Inifinite blocking call, waiting for transmission */
-restart:
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
- }
- nb_fd = ret;
- DBG3("[jul-thread] %d fd ready", nb_fd);
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = sessiond_check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- goto exit;
- }
-
- /*
- * Check first if this is a POLLERR since POLLIN is also included
- * in an error value thus checking first.
- */
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- /* Removing from the poll set */
- ret = lttng_poll_del(&events, pollfd);
- if (ret < 0) {
- goto error;
- }
-
- destroy_jul_app(pollfd);
- } else if (revents & (LPOLLIN)) {
- int new_fd;
- struct jul_app *app = NULL;
-
- /* Pollin event of JUL app socket should NEVER happen. */
- assert(pollfd == reg_sock->fd);
-
- new_fd = handle_registration(reg_sock, &app);
- if (new_fd < 0) {
- WARN("[jul-thread] JUL registration failed. Ignoring.");
- /* Somehow the communication failed. Just continue. */
- continue;
- }
- /* Should not have a NULL app on success. */
- assert(app);
-
- /* Only add poll error event to only detect shutdown. */
- ret = lttng_poll_add(&events, new_fd,
- LPOLLERR | LPOLLHUP | LPOLLRDHUP);
- if (ret < 0) {
- destroy_jul_app(new_fd);
- continue;
- }
-
- /* Update newly registered app. */
- update_jul_app(new_fd);
-
- /* On failure, the poll will detect it and clean it up. */
- (void) jul_send_registration_done(app);
- } else {
- ERR("Unknown poll events %u for sock %d", revents, pollfd);
- continue;
- }
- }
- }
-
-exit:
- /* Whatever happens, try to delete it and exit. */
- (void) lttng_poll_del(&events, reg_sock->fd);
-error:
- destroy_tcp_socket(reg_sock);
-error_tcp_socket:
- lttng_poll_clean(&events);
-error_poll_create:
- DBG("[jul-thread] is cleaning up and stopping.");
-
- if (jul_apps_ht_by_sock) {
- clean_jul_apps_ht();
- lttng_ht_destroy(jul_apps_ht_by_sock);
- }
-
- rcu_thread_offline();
- rcu_unregister_thread();
- return NULL;
-}