--- /dev/null
+/*
+ * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2018 - Jérémie Galarneau <jeremie.galarneau@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.
+ */
+
+#include "lttng-sessiond.h"
+#include "health-sessiond.h"
+#include <common/macros.h>
+#include <common/error.h>
+#include <common/utils.h>
+#include <common/pipe.h>
+#include <inttypes.h>
+#include <sys/stat.h>
+#include "utils.h"
+#include "thread.h"
+
+static void cleanup_health_management_thread(void *thread_data)
+{
+ struct lttng_pipe *quit_pipe = thread_data;
+
+ lttng_pipe_destroy(quit_pipe);
+}
+
+/*
+ * Thread managing health check socket.
+ */
+static void *thread_manage_health(void *thread_data)
+{
+ const bool is_root = (getuid() == 0);
+ int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
+ uint32_t revents, nb_fd;
+ struct lttng_poll_event events;
+ struct health_comm_msg msg;
+ struct health_comm_reply reply;
+ /* Thread-specific quit pipe. */
+ struct lttng_pipe *quit_pipe = thread_data;
+ const int quit_pipe_read_fd = lttng_pipe_get_readfd(quit_pipe);
+
+ DBG("[thread] Manage health check started");
+
+ rcu_register_thread();
+
+ /*
+ * Created with a size of two for:
+ * - client socket
+ * - thread quit pipe
+ */
+ ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Create unix socket */
+ sock = lttcomm_create_unix_sock(config.health_unix_sock_path.value);
+ if (sock < 0) {
+ ERR("Unable to create health check Unix socket");
+ goto error;
+ }
+
+ if (is_root) {
+ /* lttng health client socket path permissions */
+ ret = chown(config.health_unix_sock_path.value, 0,
+ utils_get_group_id(config.tracing_group_name.value));
+ if (ret < 0) {
+ ERR("Unable to set group on %s", config.health_unix_sock_path.value);
+ PERROR("chown");
+ goto error;
+ }
+
+ ret = chmod(config.health_unix_sock_path.value,
+ S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ if (ret < 0) {
+ ERR("Unable to set permissions on %s", config.health_unix_sock_path.value);
+ PERROR("chmod");
+ goto error;
+ }
+ }
+
+ /*
+ * Set the CLOEXEC flag. Return code is useless because either way, the
+ * show must go on.
+ */
+ (void) utils_set_fd_cloexec(sock);
+
+ ret = lttcomm_listen_unix_sock(sock);
+ if (ret < 0) {
+ goto error;
+ }
+
+ ret = lttng_poll_add(&events, quit_pipe_read_fd, LPOLLIN | LPOLLERR);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Add the application registration socket */
+ ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
+ if (ret < 0) {
+ goto error;
+ }
+
+ sessiond_notify_ready();
+
+ while (1) {
+ DBG("Health check ready");
+
+ /* Infinite 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;
+
+ for (i = 0; i < nb_fd; i++) {
+ /* Fetch once the poll data */
+ revents = LTTNG_POLL_GETEV(&events, i);
+ pollfd = LTTNG_POLL_GETFD(&events, i);
+
+ if (!revents) {
+ /* No activity for this FD (poll implementation). */
+ continue;
+ }
+
+ /* Event on the registration socket */
+ if (pollfd == sock) {
+ if (revents & LPOLLIN) {
+ continue;
+ } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
+ ERR("Health socket poll error");
+ goto error;
+ } else {
+ ERR("Unexpected poll events %u for sock %d", revents, pollfd);
+ goto error;
+ }
+ } else {
+ /* Event on the thread's quit pipe. */
+ err = 0;
+ goto exit;
+ }
+ }
+
+ new_sock = lttcomm_accept_unix_sock(sock);
+ if (new_sock < 0) {
+ goto error;
+ }
+
+ /*
+ * Set the CLOEXEC flag. Return code is useless because either way, the
+ * show must go on.
+ */
+ (void) utils_set_fd_cloexec(new_sock);
+
+ DBG("Receiving data from client for health...");
+ ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
+ if (ret <= 0) {
+ DBG("Nothing recv() from client... continuing");
+ ret = close(new_sock);
+ if (ret) {
+ PERROR("close");
+ }
+ continue;
+ }
+
+ rcu_thread_online();
+
+ memset(&reply, 0, sizeof(reply));
+ for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) {
+ /*
+ * health_check_state returns 0 if health is
+ * bad.
+ */
+ if (!health_check_state(health_sessiond, i)) {
+ reply.ret_code |= 1ULL << i;
+ }
+ }
+
+ DBG2("Health check return value %" PRIx64, reply.ret_code);
+
+ ret = lttcomm_send_unix_sock(new_sock, (void *) &reply,
+ sizeof(reply));
+ if (ret < 0) {
+ ERR("Failed to send health data back to client");
+ }
+
+ /* End of transmission */
+ ret = close(new_sock);
+ if (ret) {
+ PERROR("close");
+ }
+ }
+
+exit:
+error:
+ if (err) {
+ ERR("Health error occurred in %s", __func__);
+ }
+ DBG("Health check thread dying");
+ unlink(config.health_unix_sock_path.value);
+ if (sock >= 0) {
+ ret = close(sock);
+ if (ret) {
+ PERROR("close");
+ }
+ }
+
+ lttng_poll_clean(&events);
+ rcu_unregister_thread();
+ return NULL;
+}
+
+static bool shutdown_health_management_thread(void *thread_data)
+{
+ int ret;
+ int pipe_write_fd;
+ struct lttng_pipe *health_quit_pipe = thread_data;
+
+ pipe_write_fd = lttng_pipe_get_writefd(health_quit_pipe);
+ ret = notify_thread_pipe(pipe_write_fd);
+ if (ret < 0) {
+ ERR("Failed to notify Health management thread's quit pipe");
+ goto error;
+ }
+ return true;
+error:
+ return false;
+}
+
+bool launch_health_management_thread(void)
+{
+ struct lttng_thread *thread;
+ struct lttng_pipe *health_quit_pipe = NULL;
+
+ health_quit_pipe = lttng_pipe_open(FD_CLOEXEC);
+ if (!health_quit_pipe) {
+ goto error;
+ }
+
+ thread = lttng_thread_create("Health management",
+ thread_manage_health,
+ shutdown_health_management_thread,
+ cleanup_health_management_thread,
+ health_quit_pipe);
+ if (!thread) {
+ goto error;
+ }
+ lttng_thread_put(thread);
+ return true;
+error:
+ cleanup_health_management_thread(health_quit_pipe);
+ return false;
+}
static pthread_t client_thread;
static pthread_t kernel_thread;
static pthread_t dispatch_thread;
-static pthread_t health_thread;
static pthread_t agent_reg_thread;
static pthread_t load_session_thread;
static pthread_t notification_thread;
return ret;
}
-/*
- * Thread managing health check socket.
- */
-static void *thread_manage_health(void *data)
-{
- int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
- uint32_t revents, nb_fd;
- struct lttng_poll_event events;
- struct health_comm_msg msg;
- struct health_comm_reply reply;
-
- DBG("[thread] Manage health check started");
-
- rcu_register_thread();
-
- /* We might hit an error path before this is created. */
- lttng_poll_init(&events);
-
- /* Create unix socket */
- sock = lttcomm_create_unix_sock(config.health_unix_sock_path.value);
- if (sock < 0) {
- ERR("Unable to create health check Unix socket");
- goto error;
- }
-
- if (is_root) {
- /* lttng health client socket path permissions */
- ret = chown(config.health_unix_sock_path.value, 0,
- utils_get_group_id(config.tracing_group_name.value));
- if (ret < 0) {
- ERR("Unable to set group on %s", config.health_unix_sock_path.value);
- PERROR("chown");
- goto error;
- }
-
- ret = chmod(config.health_unix_sock_path.value,
- S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
- if (ret < 0) {
- ERR("Unable to set permissions on %s", config.health_unix_sock_path.value);
- PERROR("chmod");
- goto error;
- }
- }
-
- /*
- * Set the CLOEXEC flag. Return code is useless because either way, the
- * show must go on.
- */
- (void) utils_set_fd_cloexec(sock);
-
- ret = lttcomm_listen_unix_sock(sock);
- if (ret < 0) {
- goto error;
- }
-
- /*
- * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
- * more will be added to this poll set.
- */
- ret = sessiond_set_thread_pollset(&events, 2);
- if (ret < 0) {
- goto error;
- }
-
- /* Add the application registration socket */
- ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
- if (ret < 0) {
- goto error;
- }
-
- sessiond_notify_ready();
-
- while (1) {
- DBG("Health check ready");
-
- /* 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;
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- if (!revents) {
- /* No activity for this FD (poll implementation). */
- continue;
- }
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = sessiond_check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- goto exit;
- }
-
- /* Event on the registration socket */
- if (pollfd == sock) {
- if (revents & LPOLLIN) {
- continue;
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Health socket poll error");
- goto error;
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- }
- }
-
- new_sock = lttcomm_accept_unix_sock(sock);
- if (new_sock < 0) {
- goto error;
- }
-
- /*
- * Set the CLOEXEC flag. Return code is useless because either way, the
- * show must go on.
- */
- (void) utils_set_fd_cloexec(new_sock);
-
- DBG("Receiving data from client for health...");
- ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
- if (ret <= 0) {
- DBG("Nothing recv() from client... continuing");
- ret = close(new_sock);
- if (ret) {
- PERROR("close");
- }
- continue;
- }
-
- rcu_thread_online();
-
- memset(&reply, 0, sizeof(reply));
- for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) {
- /*
- * health_check_state returns 0 if health is
- * bad.
- */
- if (!health_check_state(health_sessiond, i)) {
- reply.ret_code |= 1ULL << i;
- }
- }
-
- DBG2("Health check return value %" PRIx64, reply.ret_code);
-
- ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
- if (ret < 0) {
- ERR("Failed to send health data back to client");
- }
-
- /* End of transmission */
- ret = close(new_sock);
- if (ret) {
- PERROR("close");
- }
- }
-
-exit:
-error:
- if (err) {
- ERR("Health error occurred in %s", __func__);
- }
- DBG("Health check thread dying");
- unlink(config.health_unix_sock_path.value);
- if (sock >= 0) {
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- }
-
- lttng_poll_clean(&events);
- stop_threads();
- rcu_unregister_thread();
- return NULL;
-}
-
/*
* This thread manage all clients request using the unix client socket for
* communication.
load_info->path = config.load_session_path.value;
/* Create health-check thread. */
- ret = pthread_create(&health_thread, default_pthread_attr(),
- thread_manage_health, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create health");
+ if (!launch_health_management_thread()) {
retval = -1;
goto exit_health;
}
exit_rotation:
exit_notification:
sem_destroy(¬ification_thread_ready);
- ret = pthread_join(health_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join health thread");
- retval = -1;
- }
lttng_thread_list_shutdown_orphans();
-
exit_health:
exit_init_data:
/*
projects / lttng-tools.git / commitdiff
