--- /dev/null
+/*
+ * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#define _LGPL_SOURCE
+#include <urcu/uatomic.h>
+#include <urcu/rculist.h>
+
+#include <lttng/event-rule/event-rule.h>
+#include <lttng/event-rule/event-rule-internal.h>
+#include <lttng/event-rule/jul-logging.h>
+#include <lttng/event-rule/log4j-logging.h>
+#include <lttng/event-rule/python-logging.h>
+#include <lttng/condition/condition.h>
+#include <lttng/condition/event-rule-matches.h>
+#include <lttng/domain-internal.h>
+#include <lttng/log-level-rule-internal.h>
+
+#include <common/common.h>
+#include <common/sessiond-comm/agent.h>
+
+#include <common/compat/endian.h>
+
+#include "agent.h"
+#include "ust-app.h"
+#include "utils.h"
+#include "common/error.h"
+
+typedef enum lttng_event_rule_status (*event_rule_logging_get_name_pattern)(
+ const struct lttng_event_rule *rule, const char **pattern);
+typedef enum lttng_event_rule_status (*event_rule_logging_get_log_level_rule)(
+ const struct lttng_event_rule *rule,
+ const struct lttng_log_level_rule **log_level_rule);
+
+/*
+ * Agent application context representation.
+ */
+struct agent_app_ctx {
+ char *provider_name;
+ char *ctx_name;
+
+ /* agent_app_ctx are part of the agent app_ctx_list. */
+ struct cds_list_head list_node;
+
+ /* For call_rcu teardown. */
+ struct rcu_head rcu_node;
+};
+
+/*
+ * Human readable agent return code.
+ */
+static
+const char *lttcomm_agent_ret_code_str(lttcomm_agent_ret_code code)
+{
+ switch (code) {
+ case AGENT_RET_CODE_SUCCESS:
+ return "Success";
+ case AGENT_RET_CODE_INVALID:
+ return "Invalid command";
+ case AGENT_RET_CODE_UNKNOWN_NAME:
+ return "Unknown logger name";
+ default:
+ return "Unknown code";
+ }
+};
+
+static
+void log_reply_code(uint32_t in_reply_ret_code)
+{
+ int level = PRINT_DBG3;
+ /*
+ * reply_ret_code and in_reply_ret_code are kept separate to have a
+ * sanitized value (used to retrieve the human readable string) and the
+ * original value which is logged as-is.
+ */
+ uint32_t reply_ret_code = in_reply_ret_code;
+
+ if (reply_ret_code < AGENT_RET_CODE_SUCCESS ||
+ reply_ret_code >= AGENT_RET_CODE_NR) {
+ reply_ret_code = AGENT_RET_CODE_NR;
+ level = PRINT_ERR;
+ }
+
+ LOG(level, "Agent replied with retcode: %s (%" PRIu32 ")",
+ lttcomm_agent_ret_code_str((lttcomm_agent_ret_code) reply_ret_code),
+ in_reply_ret_code);
+}
+
+/*
+ * Match function for the events hash table lookup by name.
+ */
+static int ht_match_event_by_name(struct cds_lfht_node *node,
+ const void *_key)
+{
+ struct agent_event *event;
+ const struct agent_ht_key *key;
+
+ LTTNG_ASSERT(node);
+ LTTNG_ASSERT(_key);
+
+ event = caa_container_of(node, struct agent_event, node.node);
+ key = (agent_ht_key *) _key;
+
+ /* Match 1 elements of the key: name. */
+
+ /* Event name */
+ if (strncmp(event->name, key->name, sizeof(event->name)) != 0) {
+ goto no_match;
+ }
+ /* Match. */
+ return 1;
+
+no_match:
+ return 0;
+}
+
+/*
+ * Match function for the events hash table lookup by name, log level and
+ * filter expression.
+ */
+static int ht_match_event(struct cds_lfht_node *node,
+ const void *_key)
+{
+ struct agent_event *event;
+ const struct agent_ht_key *key;
+ int ll_match;
+
+ LTTNG_ASSERT(node);
+ LTTNG_ASSERT(_key);
+
+ event = caa_container_of(node, struct agent_event, node.node);
+ key = (agent_ht_key *) _key;
+
+ /* Match 2 elements of the key: name and loglevel. */
+
+ /* Event name */
+ if (strncmp(event->name, key->name, sizeof(event->name)) != 0) {
+ goto no_match;
+ }
+
+ /* Event loglevel value and type. */
+ ll_match = loglevels_match(event->loglevel_type,
+ event->loglevel_value, key->loglevel_type,
+ key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL);
+
+ if (!ll_match) {
+ goto no_match;
+ }
+
+ /* Filter expression */
+ if (!!event->filter_expression != !!key->filter_expression) {
+ /* One has a filter expression, the other does not */
+ goto no_match;
+ }
+
+ if (event->filter_expression) {
+ if (strncmp(event->filter_expression, key->filter_expression,
+ strlen(event->filter_expression)) != 0) {
+ goto no_match;
+ }
+ }
+
+ return 1;
+
+no_match:
+ return 0;
+}
+
+/*
+ * Add unique agent event based on the event name and loglevel.
+ */
+static void add_unique_agent_event(struct lttng_ht *ht,
+ struct agent_event *event)
+{
+ struct cds_lfht_node *node_ptr;
+ struct agent_ht_key key;
+
+ LTTNG_ASSERT(ht);
+ LTTNG_ASSERT(ht->ht);
+ LTTNG_ASSERT(event);
+
+ key.name = event->name;
+ key.loglevel_value = event->loglevel_value;
+ key.loglevel_type = event->loglevel_type;
+ key.filter_expression = event->filter_expression;
+
+ node_ptr = cds_lfht_add_unique(ht->ht,
+ ht->hash_fct(event->node.key, lttng_ht_seed),
+ ht_match_event, &key, &event->node.node);
+ LTTNG_ASSERT(node_ptr == &event->node.node);
+}
+
+/*
+ * URCU delayed agent event reclaim.
+ */
+static void destroy_event_agent_rcu(struct rcu_head *head)
+{
+ struct lttng_ht_node_str *node =
+ caa_container_of(head, struct lttng_ht_node_str, head);
+ struct agent_event *event =
+ caa_container_of(node, struct agent_event, node);
+
+ agent_destroy_event(event);
+}
+
+/*
+ * URCU delayed agent app reclaim.
+ */
+static void destroy_app_agent_rcu(struct rcu_head *head)
+{
+ struct lttng_ht_node_ulong *node =
+ caa_container_of(head, struct lttng_ht_node_ulong, head);
+ struct agent_app *app =
+ caa_container_of(node, struct agent_app, node);
+
+ free(app);
+}
+
+/*
+ * Communication with the agent. Send the message header to the given socket in
+ * big endian.
+ *
+ * Return 0 on success or else a negative errno message of sendmsg() op.
+ */
+static int send_header(struct lttcomm_sock *sock, uint64_t data_size,
+ uint32_t cmd, uint32_t cmd_version)
+{
+ int ret;
+ ssize_t size;
+ struct lttcomm_agent_hdr msg;
+
+ LTTNG_ASSERT(sock);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.data_size = htobe64(data_size);
+ msg.cmd = htobe32(cmd);
+ msg.cmd_version = htobe32(cmd_version);
+
+ size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0);
+ if (size < sizeof(msg)) {
+ ret = -errno;
+ goto error;
+ }
+ ret = 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Communication call with the agent. Send the payload to the given socket. The
+ * header MUST be sent prior to this call.
+ *
+ * Return 0 on success or else a negative errno value of sendmsg() op.
+ */
+static int send_payload(struct lttcomm_sock *sock, const void *data,
+ size_t size)
+{
+ int ret;
+ ssize_t len;
+
+ LTTNG_ASSERT(sock);
+ LTTNG_ASSERT(data);
+
+ len = sock->ops->sendmsg(sock, data, size, 0);
+ if (len < size) {
+ ret = -errno;
+ goto error;
+ }
+ ret = 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Communication call with the agent. Receive reply from the agent using the
+ * given socket.
+ *
+ * Return 0 on success or else a negative errno value from recvmsg() op.
+ */
+static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size)
+{
+ int ret;
+ ssize_t len;
+
+ LTTNG_ASSERT(sock);
+ LTTNG_ASSERT(buf);
+
+ len = sock->ops->recvmsg(sock, buf, size, 0);
+ if (len < size) {
+ ret = -errno;
+ goto error;
+ }
+ ret = 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Internal event listing for a given app. Populate events.
+ *
+ * Return number of element in the list or else a negative LTTNG_ERR* code.
+ * On success, the caller is responsible for freeing the memory
+ * allocated for "events".
+ */
+static ssize_t list_events(struct agent_app *app, struct lttng_event **events)
+{
+ int ret, i, len = 0, offset = 0;
+ uint32_t nb_event;
+ size_t data_size;
+ uint32_t reply_ret_code;
+ struct lttng_event *tmp_events = NULL;
+ struct lttcomm_agent_list_reply *reply = NULL;
+ struct lttcomm_agent_list_reply_hdr reply_hdr;
+
+ LTTNG_ASSERT(app);
+ LTTNG_ASSERT(app->sock);
+ LTTNG_ASSERT(events);
+
+ DBG2("Agent listing events for app pid: %d and socket %d", app->pid,
+ app->sock->fd);
+
+ ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0);
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ /* Get list header so we know how much we'll receive. */
+ ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr));
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ reply_ret_code = be32toh(reply_hdr.ret_code);
+ log_reply_code(reply_ret_code);
+ switch (reply_ret_code) {
+ case AGENT_RET_CODE_SUCCESS:
+ data_size = be32toh(reply_hdr.data_size) + sizeof(*reply);
+ break;
+ default:
+ ret = LTTNG_ERR_UNK;
+ goto error;
+ }
+
+ reply = (lttcomm_agent_list_reply *) zmalloc(data_size);
+ if (!reply) {
+ ret = LTTNG_ERR_NOMEM;
+ goto error;
+ }
+
+ /* Get the list with the appropriate data size. */
+ ret = recv_reply(app->sock, reply, data_size);
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ nb_event = be32toh(reply->nb_event);
+ tmp_events = (lttng_event *) zmalloc(sizeof(*tmp_events) * nb_event);
+ if (!tmp_events) {
+ ret = LTTNG_ERR_NOMEM;
+ goto error;
+ }
+
+ for (i = 0; i < nb_event; i++) {
+ offset += len;
+ if (lttng_strncpy(tmp_events[i].name, reply->payload + offset,
+ sizeof(tmp_events[i].name))) {
+ ret = LTTNG_ERR_INVALID;
+ goto error;
+ }
+ tmp_events[i].pid = app->pid;
+ tmp_events[i].enabled = -1;
+ len = strlen(reply->payload + offset) + 1;
+ }
+
+ *events = tmp_events;
+
+ free(reply);
+ return nb_event;
+
+error_io:
+ ret = LTTNG_ERR_UST_LIST_FAIL;
+error:
+ free(reply);
+ free(tmp_events);
+ return -ret;
+
+}
+
+/*
+ * Internal enable agent event on a agent application. This function
+ * communicates with the agent to enable a given event.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR* code.
+ */
+static int enable_event(const struct agent_app *app, struct agent_event *event)
+{
+ int ret;
+ char *bytes_to_send;
+ uint64_t data_size;
+ size_t filter_expression_length;
+ uint32_t reply_ret_code;
+ struct lttcomm_agent_enable_event msg;
+ struct lttcomm_agent_generic_reply reply;
+
+ LTTNG_ASSERT(app);
+ LTTNG_ASSERT(app->sock);
+ LTTNG_ASSERT(event);
+
+ DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name,
+ app->pid, app->sock->fd);
+
+ /*
+ * Calculate the payload's size, which is the fixed-size struct followed
+ * by the variable-length filter expression (+1 for the ending \0).
+ */
+ if (!event->filter_expression) {
+ filter_expression_length = 0;
+ } else {
+ filter_expression_length = strlen(event->filter_expression) + 1;
+ }
+ data_size = sizeof(msg) + filter_expression_length;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.loglevel_value = htobe32(event->loglevel_value);
+ msg.loglevel_type = htobe32(event->loglevel_type);
+ if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) {
+ ret = LTTNG_ERR_INVALID;
+ goto error;
+ }
+ msg.filter_expression_length = htobe32(filter_expression_length);
+
+ ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0);
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ bytes_to_send = (char *) zmalloc(data_size);
+ if (!bytes_to_send) {
+ ret = LTTNG_ERR_NOMEM;
+ goto error;
+ }
+
+ memcpy(bytes_to_send, &msg, sizeof(msg));
+ if (filter_expression_length > 0) {
+ memcpy(bytes_to_send + sizeof(msg), event->filter_expression,
+ filter_expression_length);
+ }
+
+ ret = send_payload(app->sock, bytes_to_send, data_size);
+ free(bytes_to_send);
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ ret = recv_reply(app->sock, &reply, sizeof(reply));
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ reply_ret_code = be32toh(reply.ret_code);
+ log_reply_code(reply_ret_code);
+ switch (reply_ret_code) {
+ case AGENT_RET_CODE_SUCCESS:
+ break;
+ case AGENT_RET_CODE_UNKNOWN_NAME:
+ ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
+ goto error;
+ default:
+ ret = LTTNG_ERR_UNK;
+ goto error;
+ }
+
+ return LTTNG_OK;
+
+error_io:
+ ret = LTTNG_ERR_UST_ENABLE_FAIL;
+error:
+ return ret;
+}
+
+/*
+ * Send Pascal-style string. Size is sent as a 32-bit big endian integer.
+ */
+static
+int send_pstring(struct lttcomm_sock *sock, const char *str, uint32_t len)
+{
+ int ret;
+ uint32_t len_be;
+
+ len_be = htobe32(len);
+ ret = send_payload(sock, &len_be, sizeof(len_be));
+ if (ret) {
+ goto end;
+ }
+
+ ret = send_payload(sock, str, len);
+ if (ret) {
+ goto end;
+ }
+end:
+ return ret;
+}
+
+/*
+ * Internal enable application context on an agent application. This function
+ * communicates with the agent to enable a given application context.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR* code.
+ */
+static int app_context_op(const struct agent_app *app,
+ const struct agent_app_ctx *ctx, enum lttcomm_agent_command cmd)
+{
+ int ret;
+ uint32_t reply_ret_code;
+ struct lttcomm_agent_generic_reply reply;
+ size_t app_ctx_provider_name_len, app_ctx_name_len, data_size;
+
+ LTTNG_ASSERT(app);
+ LTTNG_ASSERT(app->sock);
+ LTTNG_ASSERT(ctx);
+ LTTNG_ASSERT(cmd == AGENT_CMD_APP_CTX_ENABLE ||
+ cmd == AGENT_CMD_APP_CTX_DISABLE);
+
+ DBG2("Agent %s application %s:%s for app pid: %d and socket %d",
+ cmd == AGENT_CMD_APP_CTX_ENABLE ? "enabling" : "disabling",
+ ctx->provider_name, ctx->ctx_name,
+ app->pid, app->sock->fd);
+
+ /*
+ * Calculate the payload's size, which consists of the size (u32, BE)
+ * of the provider name, the NULL-terminated provider name string, the
+ * size (u32, BE) of the context name, followed by the NULL-terminated
+ * context name string.
+ */
+ app_ctx_provider_name_len = strlen(ctx->provider_name) + 1;
+ app_ctx_name_len = strlen(ctx->ctx_name) + 1;
+ data_size = sizeof(uint32_t) + app_ctx_provider_name_len +
+ sizeof(uint32_t) + app_ctx_name_len;
+
+ ret = send_header(app->sock, data_size, cmd, 0);
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ if (app_ctx_provider_name_len > UINT32_MAX ||
+ app_ctx_name_len > UINT32_MAX) {
+ ERR("Application context name > MAX_UINT32");
+ ret = LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ ret = send_pstring(app->sock, ctx->provider_name,
+ (uint32_t) app_ctx_provider_name_len);
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ ret = send_pstring(app->sock, ctx->ctx_name,
+ (uint32_t) app_ctx_name_len);
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ ret = recv_reply(app->sock, &reply, sizeof(reply));
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ reply_ret_code = be32toh(reply.ret_code);
+ log_reply_code(reply_ret_code);
+ switch (reply_ret_code) {
+ case AGENT_RET_CODE_SUCCESS:
+ break;
+ default:
+ ret = LTTNG_ERR_UNK;
+ goto error;
+ }
+
+ return LTTNG_OK;
+
+error_io:
+ ret = LTTNG_ERR_UST_ENABLE_FAIL;
+error:
+ return ret;
+}
+
+/*
+ * Internal disable agent event call on a agent application. This function
+ * communicates with the agent to disable a given event.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR* code.
+ */
+static int disable_event(struct agent_app *app, struct agent_event *event)
+{
+ int ret;
+ uint64_t data_size;
+ uint32_t reply_ret_code;
+ struct lttcomm_agent_disable_event msg;
+ struct lttcomm_agent_generic_reply reply;
+
+ LTTNG_ASSERT(app);
+ LTTNG_ASSERT(app->sock);
+ LTTNG_ASSERT(event);
+
+ DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name,
+ app->pid, app->sock->fd);
+
+ data_size = sizeof(msg);
+ memset(&msg, 0, sizeof(msg));
+ if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) {
+ ret = LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0);
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ ret = send_payload(app->sock, &msg, sizeof(msg));
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ ret = recv_reply(app->sock, &reply, sizeof(reply));
+ if (ret < 0) {
+ goto error_io;
+ }
+
+ reply_ret_code = be32toh(reply.ret_code);
+ log_reply_code(reply_ret_code);
+ switch (reply_ret_code) {
+ case AGENT_RET_CODE_SUCCESS:
+ break;
+ case AGENT_RET_CODE_UNKNOWN_NAME:
+ ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
+ goto error;
+ default:
+ ret = LTTNG_ERR_UNK;
+ goto error;
+ }
+
+ return LTTNG_OK;
+
+error_io:
+ ret = LTTNG_ERR_UST_DISABLE_FAIL;
+error:
+ return ret;
+}
+
+/*
+ * Send back the registration DONE command to a given agent application.
+ *
+ * Return 0 on success or else a negative value.
+ */
+int agent_send_registration_done(struct agent_app *app)
+{
+ LTTNG_ASSERT(app);
+ LTTNG_ASSERT(app->sock);
+
+ DBG("Agent sending registration done to app socket %d", app->sock->fd);
+
+ return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0);
+}
+
+/*
+ * Enable agent event on every agent applications registered with the session
+ * daemon.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR* code.
+ */
+int agent_enable_event(struct agent_event *event,
+ enum lttng_domain_type domain)
+{
+ int ret;
+ struct agent_app *app;
+ struct lttng_ht_iter iter;
+
+ LTTNG_ASSERT(event);
+
+ rcu_read_lock();
+
+ cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app,
+ node.node) {
+ if (app->domain != domain) {
+ continue;
+ }
+
+ /* Enable event on agent application through TCP socket. */
+ ret = enable_event(app, event);
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+ }
+
+ event->enabled_count++;
+ ret = LTTNG_OK;
+
+error:
+ rcu_read_unlock();
+ return ret;
+}
+
+static
+void destroy_app_ctx(struct agent_app_ctx *ctx)
+{
+ free(ctx->provider_name);
+ free(ctx->ctx_name);
+ free(ctx);
+}
+
+static
+struct agent_app_ctx *create_app_ctx(const struct lttng_event_context *ctx)
+{
+ struct agent_app_ctx *agent_ctx = NULL;
+
+ if (!ctx) {
+ goto end;
+ }
+
+ LTTNG_ASSERT(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT);
+ agent_ctx = (agent_app_ctx *) zmalloc(sizeof(*ctx));
+ if (!agent_ctx) {
+ goto end;
+ }
+
+ agent_ctx->provider_name = strdup(ctx->u.app_ctx.provider_name);
+ agent_ctx->ctx_name = strdup(ctx->u.app_ctx.ctx_name);
+ if (!agent_ctx->provider_name || !agent_ctx->ctx_name) {
+ destroy_app_ctx(agent_ctx);
+ agent_ctx = NULL;
+ }
+end:
+ return agent_ctx;
+}
+
+/*
+ * Enable agent context on every agent applications registered with the session
+ * daemon.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR* code.
+ */
+int agent_enable_context(const struct lttng_event_context *ctx,
+ enum lttng_domain_type domain)
+{
+ int ret;
+ struct agent_app *app;
+ struct lttng_ht_iter iter;
+
+ LTTNG_ASSERT(ctx);
+ if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
+ ret = LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ rcu_read_lock();
+
+ cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app,
+ node.node) {
+ struct agent_app_ctx *agent_ctx;
+
+ if (app->domain != domain) {
+ continue;
+ }
+
+ agent_ctx = create_app_ctx(ctx);
+ if (!agent_ctx) {
+ ret = LTTNG_ERR_NOMEM;
+ goto error_unlock;
+ }
+
+ /* Enable event on agent application through TCP socket. */
+ ret = app_context_op(app, agent_ctx, AGENT_CMD_APP_CTX_ENABLE);
+ destroy_app_ctx(agent_ctx);
+ if (ret != LTTNG_OK) {
+ goto error_unlock;
+ }
+ }
+
+ ret = LTTNG_OK;
+
+error_unlock:
+ rcu_read_unlock();
+error:
+ return ret;
+}
+
+/*
+ * Disable agent event on every agent application registered with the session
+ * daemon.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR* code.
+ */
+int agent_disable_event(struct agent_event *event,
+ enum lttng_domain_type domain)
+{
+ int ret = LTTNG_OK;
+ struct agent_app *app;
+ struct lttng_ht_iter iter;
+
+ LTTNG_ASSERT(event);
+ if (!AGENT_EVENT_IS_ENABLED(event)) {
+ goto end;
+ }
+
+ if (--event->enabled_count != 0) {
+ /*
+ * Agent event still enabled. Disable the agent event only when
+ * all "users" have disabled it (event notifiers, event rules,
+ * etc.).
+ */
+ ret = LTTNG_OK;
+ goto end;
+ }
+
+ rcu_read_lock();
+
+ cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app,
+ node.node) {
+ if (app->domain != domain) {
+ continue;
+ }
+
+ /* Enable event on agent application through TCP socket. */
+ ret = disable_event(app, event);
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+ }
+
+ /* event->enabled_count is now 0. */
+ LTTNG_ASSERT(!AGENT_EVENT_IS_ENABLED(event));
+
+error:
+ rcu_read_unlock();
+end:
+ return ret;
+}
+
+/*
+ * Disable agent context on every agent application registered with the session
+ * daemon.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR* code.
+ */
+static int disable_context(struct agent_app_ctx *ctx,
+ enum lttng_domain_type domain)
+{
+ int ret = LTTNG_OK;
+ struct agent_app *app;
+ struct lttng_ht_iter iter;
+
+ LTTNG_ASSERT(ctx);
+
+ rcu_read_lock();
+ DBG2("Disabling agent application context %s:%s",
+ ctx->provider_name, ctx->ctx_name);
+ cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app,
+ node.node) {
+ if (app->domain != domain) {
+ continue;
+ }
+
+ ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_DISABLE);
+ if (ret != LTTNG_OK) {
+ goto end;
+ }
+ }
+end:
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * Ask every agent for the list of possible event. Events is allocated with the
+ * events of every agent application.
+ *
+ * Return the number of events or else a negative value.
+ */
+int agent_list_events(struct lttng_event **events,
+ enum lttng_domain_type domain)
+{
+ int ret;
+ size_t nbmem, count = 0;
+ struct agent_app *app;
+ struct lttng_event *tmp_events = NULL;
+ struct lttng_ht_iter iter;
+
+ LTTNG_ASSERT(events);
+
+ DBG2("Agent listing events for domain %d", domain);
+
+ nbmem = UST_APP_EVENT_LIST_SIZE;
+ tmp_events = (lttng_event *) zmalloc(nbmem * sizeof(*tmp_events));
+ if (!tmp_events) {
+ PERROR("zmalloc agent list events");
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app,
+ node.node) {
+ ssize_t nb_ev;
+ struct lttng_event *agent_events;
+
+ /* Skip domain not asked by the list. */
+ if (app->domain != domain) {
+ continue;
+ }
+
+ nb_ev = list_events(app, &agent_events);
+ if (nb_ev < 0) {
+ ret = nb_ev;
+ goto error_unlock;
+ }
+
+ if (count + nb_ev > nbmem) {
+ /* In case the realloc fails, we free the memory */
+ struct lttng_event *new_tmp_events;
+ size_t new_nbmem;
+
+ new_nbmem = std::max(count + nb_ev, nbmem << 1);
+ DBG2("Reallocating agent event list from %zu to %zu entries",
+ nbmem, new_nbmem);
+ new_tmp_events = (lttng_event *) realloc(tmp_events,
+ new_nbmem * sizeof(*new_tmp_events));
+ if (!new_tmp_events) {
+ PERROR("realloc agent events");
+ ret = -ENOMEM;
+ free(agent_events);
+ goto error_unlock;
+ }
+ /* Zero the new memory */
+ memset(new_tmp_events + nbmem, 0,
+ (new_nbmem - nbmem) * sizeof(*new_tmp_events));
+ nbmem = new_nbmem;
+ tmp_events = new_tmp_events;
+ }
+ memcpy(tmp_events + count, agent_events,
+ nb_ev * sizeof(*tmp_events));
+ free(agent_events);
+ count += nb_ev;
+ }
+ rcu_read_unlock();
+
+ ret = count;
+ *events = tmp_events;
+ return ret;
+
+error_unlock:
+ rcu_read_unlock();
+error:
+ free(tmp_events);
+ return ret;
+}
+
+/*
+ * Create a agent app object using the given PID.
+ *
+ * Return newly allocated object or else NULL on error.
+ */
+struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain,
+ struct lttcomm_sock *sock)
+{
+ struct agent_app *app;
+
+ LTTNG_ASSERT(sock);
+
+ app = (agent_app *) zmalloc(sizeof(*app));
+ if (!app) {
+ PERROR("Failed to allocate agent application instance");
+ goto error;
+ }
+
+ app->pid = pid;
+ app->domain = domain;
+ app->sock = sock;
+ lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd);
+
+error:
+ return app;
+}
+
+/*
+ * Lookup agent app by socket in the global hash table.
+ *
+ * RCU read side lock MUST be acquired.
+ *
+ * Return object if found else NULL.
+ */
+struct agent_app *agent_find_app_by_sock(int sock)
+{
+ struct lttng_ht_node_ulong *node;
+ struct lttng_ht_iter iter;
+ struct agent_app *app;
+
+ LTTNG_ASSERT(sock >= 0);
+
+ lttng_ht_lookup(the_agent_apps_ht_by_sock,
+ (void *) ((unsigned long) sock), &iter);
+ node = lttng_ht_iter_get_node_ulong(&iter);
+ if (node == NULL) {
+ goto error;
+ }
+ app = caa_container_of(node, struct agent_app, node);
+
+ DBG3("Agent app pid %d found by sock %d.", app->pid, sock);
+ return app;
+
+error:
+ DBG3("Agent app NOT found by sock %d.", sock);
+ return NULL;
+}
+
+/*
+ * Add agent application object to the global hash table.
+ */
+void agent_add_app(struct agent_app *app)
+{
+ LTTNG_ASSERT(app);
+
+ DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid);
+ lttng_ht_add_unique_ulong(the_agent_apps_ht_by_sock, &app->node);
+}
+
+/*
+ * Delete agent application from the global hash table.
+ *
+ * rcu_read_lock() must be held by the caller.
+ */
+void agent_delete_app(struct agent_app *app)
+{
+ int ret;
+ struct lttng_ht_iter iter;
+
+ LTTNG_ASSERT(app);
+
+ DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd);
+
+ iter.iter.node = &app->node.node;
+ ret = lttng_ht_del(the_agent_apps_ht_by_sock, &iter);
+ LTTNG_ASSERT(!ret);
+}
+
+/*
+ * Destroy an agent application object by detaching it from its corresponding
+ * UST app if one is connected by closing the socket. Finally, perform a
+ * delayed memory reclaim.
+ */
+void agent_destroy_app(struct agent_app *app)
+{
+ LTTNG_ASSERT(app);
+
+ if (app->sock) {
+ app->sock->ops->close(app->sock);
+ lttcomm_destroy_sock(app->sock);
+ }
+
+ call_rcu(&app->node.head, destroy_app_agent_rcu);
+}
+
+/*
+ * Initialize an already allocated agent object.
+ *
+ * Return 0 on success or else a negative errno value.
+ */
+int agent_init(struct agent *agt)
+{
+ int ret;
+
+ LTTNG_ASSERT(agt);
+
+ agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
+ if (!agt->events) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ lttng_ht_node_init_u64(&agt->node, agt->domain);
+
+ CDS_INIT_LIST_HEAD(&agt->app_ctx_list);
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Add agent object to the given hash table.
+ */
+void agent_add(struct agent *agt, struct lttng_ht *ht)
+{
+ LTTNG_ASSERT(agt);
+ LTTNG_ASSERT(ht);
+
+ DBG3("Agent adding from domain %d", agt->domain);
+
+ lttng_ht_add_unique_u64(ht, &agt->node);
+}
+
+/*
+ * Create an agent object for the given domain.
+ *
+ * Return the allocated agent or NULL on error.
+ */
+struct agent *agent_create(enum lttng_domain_type domain)
+{
+ int ret;
+ struct agent *agt;
+
+ agt = (agent *) zmalloc(sizeof(struct agent));
+ if (!agt) {
+ goto error;
+ }
+ agt->domain = domain;
+
+ ret = agent_init(agt);
+ if (ret < 0) {
+ free(agt);
+ agt = NULL;
+ goto error;
+ }
+
+error:
+ return agt;
+}
+
+/*
+ * Create a newly allocated agent event data structure.
+ * Ownership of filter_expression is taken.
+ *
+ * Return a new object else NULL on error.
+ */
+struct agent_event *agent_create_event(const char *name,
+ enum lttng_loglevel_type loglevel_type, int loglevel_value,
+ struct lttng_bytecode *filter, char *filter_expression)
+{
+ struct agent_event *event = NULL;
+
+ DBG3("Agent create new event with name %s, loglevel type %d, \
+ loglevel value %d and filter %s",
+ name, loglevel_type, loglevel_value,
+ filter_expression ? filter_expression : "NULL");
+
+ if (!name) {
+ ERR("Failed to create agent event; no name provided.");
+ goto error;
+ }
+
+ event = (agent_event *) zmalloc(sizeof(*event));
+ if (!event) {
+ goto error;
+ }
+
+ strncpy(event->name, name, sizeof(event->name));
+ event->name[sizeof(event->name) - 1] = '\0';
+ lttng_ht_node_init_str(&event->node, event->name);
+
+ event->loglevel_value = loglevel_value;
+ event->loglevel_type = loglevel_type;
+ event->filter = filter;
+ event->filter_expression = filter_expression;
+error:
+ return event;
+}
+
+/*
+ * Unique add of a agent event to an agent object.
+ */
+void agent_add_event(struct agent_event *event, struct agent *agt)
+{
+ LTTNG_ASSERT(event);
+ LTTNG_ASSERT(agt);
+ LTTNG_ASSERT(agt->events);
+
+ DBG3("Agent adding event %s", event->name);
+ add_unique_agent_event(agt->events, event);
+ agt->being_used = 1;
+}
+
+/*
+ * Unique add of a agent context to an agent object.
+ */
+int agent_add_context(const struct lttng_event_context *ctx, struct agent *agt)
+{
+ int ret = LTTNG_OK;
+ struct agent_app_ctx *agent_ctx = NULL;
+
+ LTTNG_ASSERT(ctx);
+ LTTNG_ASSERT(agt);
+ LTTNG_ASSERT(agt->events);
+ LTTNG_ASSERT(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT);
+
+ agent_ctx = create_app_ctx(ctx);
+ if (!agent_ctx) {
+ ret = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ DBG3("Agent adding context %s:%s", ctx->u.app_ctx.provider_name,
+ ctx->u.app_ctx.ctx_name);
+ cds_list_add_tail_rcu(&agent_ctx->list_node, &agt->app_ctx_list);
+end:
+ return ret;
+}
+
+/*
+ * Find multiple agent events sharing the given name.
+ *
+ * RCU read side lock MUST be acquired. It must be held for the
+ * duration of the iteration.
+ *
+ * Sets the given iterator.
+ */
+void agent_find_events_by_name(const char *name, struct agent *agt,
+ struct lttng_ht_iter* iter)
+{
+ struct lttng_ht *ht;
+ struct agent_ht_key key;
+
+ LTTNG_ASSERT(name);
+ LTTNG_ASSERT(agt);
+ LTTNG_ASSERT(agt->events);
+ LTTNG_ASSERT(iter);
+
+ ht = agt->events;
+ key.name = name;
+
+ cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
+ ht_match_event_by_name, &key, &iter->iter);
+}
+
+/*
+ * Find the agent event matching a trigger.
+ *
+ * RCU read side lock MUST be acquired. It must be held for as long as
+ * the returned agent_event is used.
+ *
+ * Return object if found else NULL.
+ */
+struct agent_event *agent_find_event_by_trigger(
+ const struct lttng_trigger *trigger, struct agent *agt)
+{
+ enum lttng_condition_status c_status;
+ enum lttng_event_rule_status er_status;
+ enum lttng_domain_type domain;
+ const struct lttng_condition *condition;
+ const struct lttng_event_rule *rule;
+ const char *name;
+ const char *filter_expression;
+ const struct lttng_log_level_rule *log_level_rule;
+ /* Unused when loglevel_type is 'ALL'. */
+ int loglevel_value = 0;
+ enum lttng_loglevel_type loglevel_type;
+ event_rule_logging_get_name_pattern logging_get_name_pattern;
+ event_rule_logging_get_log_level_rule logging_get_log_level_rule;
+
+ LTTNG_ASSERT(agt);
+ LTTNG_ASSERT(agt->events);
+
+ condition = lttng_trigger_get_const_condition(trigger);
+
+ LTTNG_ASSERT(lttng_condition_get_type(condition) ==
+ LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES);
+
+ c_status = lttng_condition_event_rule_matches_get_rule(
+ condition, &rule);
+ LTTNG_ASSERT(c_status == LTTNG_CONDITION_STATUS_OK);
+
+ switch (lttng_event_rule_get_type(rule)) {
+ case LTTNG_EVENT_RULE_TYPE_JUL_LOGGING:
+ logging_get_name_pattern =
+ lttng_event_rule_jul_logging_get_name_pattern;
+ logging_get_log_level_rule =
+ lttng_event_rule_jul_logging_get_log_level_rule;
+ break;
+ case LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING:
+ logging_get_name_pattern =
+ lttng_event_rule_log4j_logging_get_name_pattern;
+ logging_get_log_level_rule =
+ lttng_event_rule_log4j_logging_get_log_level_rule;
+ break;
+ case LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING:
+ logging_get_name_pattern =
+ lttng_event_rule_python_logging_get_name_pattern;
+ logging_get_log_level_rule =
+ lttng_event_rule_python_logging_get_log_level_rule;
+ break;
+ default:
+ abort();
+ break;
+ }
+
+ domain = lttng_event_rule_get_domain_type(rule);
+ LTTNG_ASSERT(domain == LTTNG_DOMAIN_JUL || domain == LTTNG_DOMAIN_LOG4J ||
+ domain == LTTNG_DOMAIN_PYTHON);
+
+ /* Get the event's pattern name ('name' in the legacy terminology). */
+ er_status = logging_get_name_pattern(rule, &name);
+ LTTNG_ASSERT(er_status == LTTNG_EVENT_RULE_STATUS_OK);
+
+ /* Get the internal filter expression. */
+ filter_expression = lttng_event_rule_get_filter(rule);
+
+ /* Map log_level_rule to loglevel value. */
+ er_status = logging_get_log_level_rule(rule, &log_level_rule);
+ if (er_status == LTTNG_EVENT_RULE_STATUS_UNSET) {
+ loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
+ loglevel_value = 0;
+ } else if (er_status == LTTNG_EVENT_RULE_STATUS_OK) {
+ lttng_log_level_rule_to_loglevel(log_level_rule, &loglevel_type, &loglevel_value);
+ } else {
+ abort();
+ }
+
+ return agent_find_event(name, loglevel_type, loglevel_value,
+ filter_expression, agt);
+}
+
+/*
+ * Get the next agent event duplicate by name. This should be called
+ * after a call to agent_find_events_by_name() to iterate on events.
+ *
+ * The RCU read lock must be held during the iteration and for as long
+ * as the object the iterator points to remains in use.
+ */
+void agent_event_next_duplicate(const char *name,
+ struct agent *agt, struct lttng_ht_iter* iter)
+{
+ struct agent_ht_key key;
+
+ key.name = name;
+
+ cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name,
+ &key, &iter->iter);
+}
+
+/*
+ * Find a agent event in the given agent using name, loglevel and filter.
+ *
+ * RCU read side lock MUST be acquired. It must be kept for as long as
+ * the returned agent_event is used.
+ *
+ * Return object if found else NULL.
+ */
+struct agent_event *agent_find_event(const char *name,
+ enum lttng_loglevel_type loglevel_type,
+ int loglevel_value,
+ const char *filter_expression,
+ struct agent *agt)
+{
+ struct lttng_ht_node_str *node;
+ struct lttng_ht_iter iter;
+ struct lttng_ht *ht;
+ struct agent_ht_key key;
+
+ LTTNG_ASSERT(name);
+ LTTNG_ASSERT(agt);
+ LTTNG_ASSERT(agt->events);
+
+ ht = agt->events;
+ key.name = name;
+ key.loglevel_value = loglevel_value;
+ key.loglevel_type = loglevel_type;
+ key.filter_expression = filter_expression;
+
+ cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
+ ht_match_event, &key, &iter.iter);
+ node = lttng_ht_iter_get_node_str(&iter);
+ if (node == NULL) {
+ goto error;
+ }
+
+ DBG3("Agent event found %s.", name);
+ return caa_container_of(node, struct agent_event, node);
+
+error:
+ DBG3("Agent event NOT found %s.", name);
+ return NULL;
+}
+
+/*
+ * Free given agent event. This event must not be globally visible at this
+ * point (only expected to be used on failure just after event creation). After
+ * this call, the pointer is not usable anymore.
+ */
+void agent_destroy_event(struct agent_event *event)
+{
+ LTTNG_ASSERT(event);
+
+ free(event->filter);
+ free(event->filter_expression);
+ free(event->exclusion);
+ free(event);
+}
+
+static
+void destroy_app_ctx_rcu(struct rcu_head *head)
+{
+ struct agent_app_ctx *ctx =
+ caa_container_of(head, struct agent_app_ctx, rcu_node);
+
+ destroy_app_ctx(ctx);
+}
+
+/*
+ * Destroy an agent completely.
+ */
+void agent_destroy(struct agent *agt)
+{
+ struct lttng_ht_node_str *node;
+ struct lttng_ht_iter iter;
+ struct agent_app_ctx *ctx;
+
+ LTTNG_ASSERT(agt);
+
+ DBG3("Agent destroy");
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) {
+ int ret;
+ struct agent_event *event;
+
+ /*
+ * When destroying an event, we have to try to disable it on the
+ * agent side so the event stops generating data. The return
+ * value is not important since we have to continue anyway
+ * destroying the object.
+ */
+ event = caa_container_of(node, struct agent_event, node);
+ (void) agent_disable_event(event, agt->domain);
+
+ ret = lttng_ht_del(agt->events, &iter);
+ LTTNG_ASSERT(!ret);
+ call_rcu(&node->head, destroy_event_agent_rcu);
+ }
+
+ cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) {
+ (void) disable_context(ctx, agt->domain);
+ cds_list_del(&ctx->list_node);
+ call_rcu(&ctx->rcu_node, destroy_app_ctx_rcu);
+ }
+ rcu_read_unlock();
+ ht_cleanup_push(agt->events);
+ free(agt);
+}
+
+/*
+ * Allocate agent_apps_ht_by_sock.
+ */
+int agent_app_ht_alloc(void)
+{
+ the_agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
+ return the_agent_apps_ht_by_sock ? 0 : -1;
+}
+
+/*
+ * Destroy a agent application by socket.
+ */
+void agent_destroy_app_by_sock(int sock)
+{
+ struct agent_app *app;
+
+ LTTNG_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 when the
+ * main sessiond thread is torn down.
+ */
+ rcu_read_lock();
+ app = agent_find_app_by_sock(sock);
+ LTTNG_ASSERT(app);
+
+ /* RCU read side lock is assumed to be held by this function. */
+ agent_delete_app(app);
+
+ /* The application is freed in a RCU call but the socket is closed here. */
+ agent_destroy_app(app);
+ rcu_read_unlock();
+}
+
+/*
+ * Clean-up the agent app hash table and destroy it.
+ */
+void agent_app_ht_clean(void)
+{
+ struct lttng_ht_node_ulong *node;
+ struct lttng_ht_iter iter;
+
+ if (!the_agent_apps_ht_by_sock) {
+ return;
+ }
+ rcu_read_lock();
+ cds_lfht_for_each_entry(
+ the_agent_apps_ht_by_sock->ht, &iter.iter, node, node) {
+ struct agent_app *app;
+
+ app = caa_container_of(node, struct agent_app, node);
+ agent_destroy_app_by_sock(app->sock->fd);
+ }
+ rcu_read_unlock();
+
+ lttng_ht_destroy(the_agent_apps_ht_by_sock);
+}
+
+/*
+ * Update a agent application (given socket) using the given agent.
+ *
+ * Note that this function is most likely to be used with a tracing session
+ * thus the caller should make sure to hold the appropriate lock(s).
+ */
+void agent_update(const struct agent *agt, const struct agent_app *app)
+{
+ int ret;
+ struct agent_event *event;
+ struct lttng_ht_iter iter;
+ struct agent_app_ctx *ctx;
+
+ LTTNG_ASSERT(agt);
+ LTTNG_ASSERT(app);
+
+ DBG("Agent updating app: pid = %ld", (long) app->pid);
+
+ rcu_read_lock();
+ /*
+ * We are in the registration path thus if the application is gone,
+ * there is a serious code flow error.
+ */
+
+ cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
+ /* Skip event if disabled. */
+ if (!AGENT_EVENT_IS_ENABLED(event)) {
+ continue;
+ }
+
+ ret = enable_event(app, event);
+ if (ret != LTTNG_OK) {
+ DBG2("Agent update unable to enable event %s on app pid: %d sock %d",
+ event->name, app->pid, app->sock->fd);
+ /* Let's try the others here and don't assume the app is dead. */
+ continue;
+ }
+ }
+
+ cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) {
+ ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_ENABLE);
+ if (ret != LTTNG_OK) {
+ DBG2("Agent update unable to add application context %s:%s on app pid: %d sock %d",
+ ctx->provider_name, ctx->ctx_name,
+ app->pid, app->sock->fd);
+ continue;
+ }
+ }
+
+ rcu_read_unlock();
+}
+
+/*
+ * Allocate the per-event notifier domain agent hash table. It is lazily
+ * populated as domains are used.
+ */
+int agent_by_event_notifier_domain_ht_create(void)
+{
+ the_trigger_agents_ht_by_domain = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
+ return the_trigger_agents_ht_by_domain ? 0 : -1;
+}
+
+/*
+ * Clean-up the per-event notifier domain agent hash table and destroy it.
+ */
+void agent_by_event_notifier_domain_ht_destroy(void)
+{
+ struct lttng_ht_node_u64 *node;
+ struct lttng_ht_iter iter;
+
+ if (!the_trigger_agents_ht_by_domain) {
+ return;
+ }
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(the_trigger_agents_ht_by_domain->ht,
+ &iter.iter, node, node) {
+ struct agent *agent =
+ caa_container_of(node, struct agent, node);
+ const int ret = lttng_ht_del(
+ the_trigger_agents_ht_by_domain, &iter);
+
+ LTTNG_ASSERT(ret == 0);
+ agent_destroy(agent);
+ }
+
+ rcu_read_unlock();
+ lttng_ht_destroy(the_trigger_agents_ht_by_domain);
+}
+
+struct agent *agent_find_by_event_notifier_domain(
+ enum lttng_domain_type domain_type)
+{
+ struct agent *agt = NULL;
+ struct lttng_ht_node_u64 *node;
+ struct lttng_ht_iter iter;
+ const uint64_t key = (uint64_t) domain_type;
+
+ LTTNG_ASSERT(the_trigger_agents_ht_by_domain);
+
+ DBG3("Per-event notifier domain agent lookup for domain '%s'",
+ lttng_domain_type_str(domain_type));
+
+ lttng_ht_lookup(the_trigger_agents_ht_by_domain, &key, &iter);
+ node = lttng_ht_iter_get_node_u64(&iter);
+ if (!node) {
+ goto end;
+ }
+
+ agt = caa_container_of(node, struct agent, node);
+
+end:
+ return agt;
+}
projects / lttng-tools.git / blobdiff