+/*
+ * lttng-ctl-health.c
+ *
+ * Linux Trace Toolkit Health Control Library
+ *
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <stdint.h>
+#include <limits.h>
+#include <errno.h>
+#include <lttng/health-internal.h>
+
+#include <bin/lttng-sessiond/health-sessiond.h>
+#include <bin/lttng-consumerd/health-consumerd.h>
+#include <bin/lttng-relayd/health-relayd.h>
+#include <common/defaults.h>
+#include <common/utils.h>
+
+#include "lttng-ctl-helper.h"
+
+enum health_component {
+ HEALTH_COMPONENT_SESSIOND,
+ HEALTH_COMPONENT_CONSUMERD,
+ HEALTH_COMPONENT_RELAYD,
+
+ NR_HEALTH_COMPONENT,
+};
+
+struct lttng_health_thread {
+ struct lttng_health *p;
+ int state;
+};
+
+struct lttng_health {
+ enum health_component component;
+ uint64_t state;
+ unsigned int nr_threads;
+ char health_sock_path[PATH_MAX];
+ /* For consumer health only */
+ enum lttng_health_consumerd consumerd_type;
+ struct lttng_health_thread thread[];
+};
+
+static
+const char *sessiond_thread_name[NR_HEALTH_SESSIOND_TYPES] = {
+ [ HEALTH_SESSIOND_TYPE_CMD ] = "Session daemon command",
+ [ HEALTH_SESSIOND_TYPE_APP_MANAGE ] = "Session daemon application manager",
+ [ HEALTH_SESSIOND_TYPE_APP_REG ] = "Session daemon application registration",
+ [ HEALTH_SESSIOND_TYPE_KERNEL ] = "Session daemon kernel",
+ [ HEALTH_SESSIOND_TYPE_CONSUMER ] = "Session daemon consumer manager",
+ [ HEALTH_SESSIOND_TYPE_HT_CLEANUP ] = "Session daemon hash table cleanup",
+ [ HEALTH_SESSIOND_TYPE_APP_MANAGE_NOTIFY ] = "Session daemon application notification manager",
+ [ HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH ] = "Session daemon application registration dispatcher",
+};
+
+static
+const char *consumerd_thread_name[NR_HEALTH_CONSUMERD_TYPES] = {
+ [ HEALTH_CONSUMERD_TYPE_CHANNEL ] = "Consumer daemon channel",
+ [ HEALTH_CONSUMERD_TYPE_METADATA ] = "Consumer daemon metadata",
+ [ HEALTH_CONSUMERD_TYPE_DATA ] = "Consumer daemon data",
+ [ HEALTH_CONSUMERD_TYPE_SESSIOND ] = "Consumer daemon session daemon command manager",
+ [ HEALTH_CONSUMERD_TYPE_METADATA_TIMER ] = "Consumer daemon metadata timer",
+};
+
+static
+const char *relayd_thread_name[NR_HEALTH_RELAYD_TYPES] = {
+ [ HEALTH_RELAYD_TYPE_DISPATCHER ] = "Relay daemon dispatcher",
+ [ HEALTH_RELAYD_TYPE_WORKER ] = "Relay daemon worker",
+ [ HEALTH_RELAYD_TYPE_LISTENER ] = "Relay daemon listener",
+};
+
+static
+const char **thread_name[NR_HEALTH_COMPONENT] = {
+ [ HEALTH_COMPONENT_SESSIOND ] = sessiond_thread_name,
+ [ HEALTH_COMPONENT_CONSUMERD] = consumerd_thread_name,
+ [ HEALTH_COMPONENT_RELAYD ] = relayd_thread_name,
+};
+
+/*
+ * Set health socket path.
+ *
+ * Returns 0 on success or -ENOMEM.
+ */
+static
+int set_health_socket_path(struct lttng_health *lh,
+ int tracing_group)
+{
+ uid_t uid;
+ const char *home;
+ int ret;
+ /* Global and home format strings */
+ const char *global_str, *home_str;
+
+ switch (lh->component) {
+ case HEALTH_COMPONENT_SESSIOND:
+ global_str = DEFAULT_GLOBAL_HEALTH_UNIX_SOCK;
+ home_str = DEFAULT_HOME_HEALTH_UNIX_SOCK;
+ break;
+ case HEALTH_COMPONENT_CONSUMERD:
+ switch (lh->consumerd_type) {
+ case LTTNG_HEALTH_CONSUMERD_UST_32:
+ global_str = DEFAULT_GLOBAL_USTCONSUMER32_HEALTH_UNIX_SOCK;
+ home_str = DEFAULT_HOME_USTCONSUMER32_HEALTH_UNIX_SOCK;
+ break;
+ case LTTNG_HEALTH_CONSUMERD_UST_64:
+ global_str = DEFAULT_GLOBAL_USTCONSUMER64_HEALTH_UNIX_SOCK;
+ home_str = DEFAULT_HOME_USTCONSUMER64_HEALTH_UNIX_SOCK;
+ break;
+ case LTTNG_HEALTH_CONSUMERD_KERNEL:
+ global_str = DEFAULT_GLOBAL_KCONSUMER_HEALTH_UNIX_SOCK;
+ home_str = DEFAULT_HOME_KCONSUMER_HEALTH_UNIX_SOCK;
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ case HEALTH_COMPONENT_RELAYD:
+ if (lh->health_sock_path[0] == '\0') {
+ return -EINVAL;
+ } else {
+ return 0;
+ }
+ break; /* Unreached */
+ default:
+ return -EINVAL;
+ }
+
+ uid = getuid();
+
+ if (uid == 0 || tracing_group) {
+ lttng_ctl_copy_string(lh->health_sock_path,
+ global_str,
+ sizeof(lh->health_sock_path));
+ return 0;
+ }
+
+ /*
+ * With GNU C < 2.1, snprintf returns -1 if the target buffer
+ * is too small; With GNU C >= 2.1, snprintf returns the
+ * required size (excluding closing null).
+ */
+ home = utils_get_home_dir();
+ if (home == NULL) {
+ /* Fallback in /tmp */
+ home = "/tmp";
+ }
+
+ ret = snprintf(lh->health_sock_path, sizeof(lh->health_sock_path),
+ home_str, home);
+ if ((ret < 0) || (ret >= sizeof(lh->health_sock_path))) {
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static
+struct lttng_health *lttng_health_create(enum health_component hc,
+ unsigned int nr_threads)
+{
+ struct lttng_health *lh;
+ int i;
+
+ lh = zmalloc(sizeof(*lh) + sizeof(lh->thread[0]) * nr_threads);
+ if (!lh) {
+ return NULL;
+ }
+
+ lh->component = hc;
+ lh->state = UINT64_MAX; /* All bits in error initially */
+ lh->nr_threads = nr_threads;
+ for (i = 0; i < nr_threads; i++) {
+ lh->thread[i].p = lh;
+ }
+ return lh;
+}
+
+struct lttng_health *lttng_health_create_sessiond(void)
+{
+ struct lttng_health *lh;
+
+ lh = lttng_health_create(HEALTH_COMPONENT_SESSIOND,
+ NR_HEALTH_SESSIOND_TYPES);
+ if (!lh) {
+ return NULL;
+ }
+ return lh;
+}
+
+struct lttng_health *
+ lttng_health_create_consumerd(enum lttng_health_consumerd consumerd)
+{
+ struct lttng_health *lh;
+
+ lh = lttng_health_create(HEALTH_COMPONENT_CONSUMERD,
+ NR_HEALTH_CONSUMERD_TYPES);
+ if (!lh) {
+ return NULL;
+ }
+ lh->consumerd_type = consumerd;
+ return lh;
+}
+
+struct lttng_health *lttng_health_create_relayd(const char *path)
+{
+ struct lttng_health *lh;
+
+ if (!path) {
+ return NULL;
+ }
+
+ lh = lttng_health_create(HEALTH_COMPONENT_RELAYD,
+ NR_HEALTH_RELAYD_TYPES);
+ if (!lh) {
+ return NULL;
+ }
+ lttng_ctl_copy_string(lh->health_sock_path, path,
+ sizeof(lh->health_sock_path));
+ return lh;
+}
+
+void lttng_health_destroy(struct lttng_health *lh)
+{
+ free(lh);
+}
+
+int lttng_health_query(struct lttng_health *health)
+{
+ int sock, ret, i, tracing_group;
+ struct health_comm_msg msg;
+ struct health_comm_reply reply;
+
+ if (!health) {
+ return -EINVAL;
+ }
+
+ tracing_group = lttng_check_tracing_group();
+retry:
+ ret = set_health_socket_path(health, tracing_group);
+ if (ret) {
+ goto error;
+ }
+ /* Connect to the sesssion daemon */
+ sock = lttcomm_connect_unix_sock(health->health_sock_path);
+ if (sock < 0) {
+ if (tracing_group) {
+ /* For tracing group, fallback to per-user */
+ tracing_group = 0;
+ goto retry;
+ }
+ ret = -1;
+ goto error;
+ }
+
+ msg.cmd = HEALTH_CMD_CHECK;
+
+ ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg));
+ if (ret < 0) {
+ ret = -1;
+ goto close_error;
+ }
+
+ ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply));
+ if (ret < 0) {
+ ret = -1;
+ goto close_error;
+ }
+
+ health->state = reply.ret_code;
+ for (i = 0; i < health->nr_threads; i++) {
+ if (health->state & (1ULL << i)) {
+ health->thread[i].state = -1;
+ } else {
+ health->thread[i].state = 0;
+ }
+ }
+
+close_error:
+ {
+ int closeret;
+
+ closeret = close(sock);
+ assert(!closeret);
+ }
+
+error:
+ if (ret >= 0)
+ ret = 0;
+ return ret;
+}
+
+int lttng_health_state(const struct lttng_health *health)
+{
+ if (!health) {
+ return -EINVAL;
+ }
+
+ if (health->state == 0) {
+ return 0;
+ } else {
+ return -1;
+ }
+}
+
+int lttng_health_get_nr_threads(const struct lttng_health *health)
+{
+ if (!health) {
+ return -EINVAL;
+ }
+ return health->nr_threads;
+}
+
+const struct lttng_health_thread *
+ lttng_health_get_thread(const struct lttng_health *health,
+ unsigned int nth_thread)
+{
+ if (!health || nth_thread >= health->nr_threads) {
+ return NULL;
+ }
+ return &health->thread[nth_thread];
+}
+
+int lttng_health_thread_state(const struct lttng_health_thread *thread)
+{
+ if (!thread) {
+ return -EINVAL;
+ }
+ return thread->state;
+}
+
+const char *lttng_health_thread_name(const struct lttng_health_thread *thread)
+{
+ unsigned int nr;
+
+ if (!thread) {
+ return NULL;
+ }
+ nr = thread - &thread->p->thread[0];
+ return thread_name[thread->p->component][nr];
+}
projects / lttng-tools.git / commitdiff
