X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fevent.c;h=28f296a037989bfa75f70f7b1444e85a4f5ffd8c;hp=8cca21391d43dd9b20b877bc920e14d10c1a348e;hb=2463b7879c00298daa79744cdaae82ac061a4ed8;hpb=fb27f84c28e9d8ec7c8ce5ac1b541b0671a4569e diff --git a/src/bin/lttng-sessiond/event.c b/src/bin/lttng-sessiond/event.c index 8cca21391..28f296a03 100644 --- a/src/bin/lttng-sessiond/event.c +++ b/src/bin/lttng-sessiond/event.c @@ -1,39 +1,38 @@ /* - * Copyright (C) 2011 - David Goulet + * Copyright (C) 2011 David Goulet + * Copyright (C) 2016 Jérémie Galarneau * - * 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. + * SPDX-License-Identifier: GPL-2.0-only * - * 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 #define _LGPL_SOURCE #include #include #include #include +#include +#include +#include +#include +#include #include #include +#include +#include #include "channel.h" #include "event.h" #include "kernel.h" #include "lttng-sessiond.h" -#include "ust-ctl.h" +#include "lttng-ust-ctl.h" +#include "lttng-ust-error.h" #include "ust-app.h" #include "trace-kernel.h" #include "trace-ust.h" #include "agent.h" +#include "utils.h" /* * Add unique UST event based on the event name, filter bytecode and loglevel. @@ -49,7 +48,7 @@ static void add_unique_ust_event(struct lttng_ht *ht, assert(event); key.name = event->attr.name; - key.filter = (struct lttng_filter_bytecode *) event->filter; + key.filter = (struct lttng_bytecode *) event->filter; key.loglevel_type = event->attr.loglevel_type; key.loglevel_value = event->attr.loglevel; key.exclusion = event->exclusion; @@ -61,45 +60,15 @@ static void add_unique_ust_event(struct lttng_ht *ht, } /* - * Disable kernel tracepoint event for a channel from the kernel session. + * Disable kernel tracepoint events for a channel from the kernel session of + * a specified event_name and event type. + * On type LTTNG_EVENT_ALL all events with event_name are disabled. + * If event_name is NULL all events of the specified type are disabled. */ int event_kernel_disable_event(struct ltt_kernel_channel *kchan, - char *event_name) -{ - int ret; - struct ltt_kernel_event *kevent; - - assert(kchan); - - kevent = trace_kernel_get_event_by_name(event_name, kchan, - LTTNG_EVENT_ALL); - if (kevent == NULL) { - ret = LTTNG_ERR_NO_EVENT; - goto error; - } - - ret = kernel_disable_event(kevent); - if (ret < 0) { - ret = LTTNG_ERR_KERN_DISABLE_FAIL; - goto error; - } - - DBG("Kernel event %s disable for channel %s.", - kevent->event->name, kchan->channel->name); - - ret = LTTNG_OK; - -error: - return ret; -} - -/* - * Disable kernel tracepoint events for a channel from the kernel session. - */ -int event_kernel_disable_event_type(struct ltt_kernel_channel *kchan, - enum lttng_event_type type) + const char *event_name, enum lttng_event_type type) { - int ret; + int ret, error = 0, found = 0; struct ltt_kernel_event *kevent; assert(kchan); @@ -108,22 +77,26 @@ int event_kernel_disable_event_type(struct ltt_kernel_channel *kchan, cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { if (type != LTTNG_EVENT_ALL && kevent->type != type) continue; + if (event_name != NULL && strcmp(event_name, kevent->event->name)) { + continue; + } + found++; ret = kernel_disable_event(kevent); if (ret < 0) { - /* We continue disabling the rest */ + error = 1; continue; } } - ret = LTTNG_OK; - return ret; -} + DBG("Disable kernel event: found %d events with name: %s and type: %d", + found, event_name ? event_name : "NULL", type); -/* - * Disable all kernel event for a channel from the kernel session. - */ -int event_kernel_disable_event_all(struct ltt_kernel_channel *kchan) -{ - return event_kernel_disable_event_type(kchan, LTTNG_EVENT_ALL); + if (event_name != NULL && !found) { + ret = LTTNG_ERR_NO_EVENT; + } else { + ret = error ? LTTNG_ERR_KERN_DISABLE_FAIL : LTTNG_OK; + } + + return ret; } /* @@ -132,7 +105,7 @@ int event_kernel_disable_event_all(struct ltt_kernel_channel *kchan) */ int event_kernel_enable_event(struct ltt_kernel_channel *kchan, struct lttng_event *event, char *filter_expression, - struct lttng_filter_bytecode *filter) + struct lttng_bytecode *filter) { int ret; struct ltt_kernel_event *kevent; @@ -143,23 +116,11 @@ int event_kernel_enable_event(struct ltt_kernel_channel *kchan, kevent = trace_kernel_find_event(event->name, kchan, event->type, filter); if (kevent == NULL) { - ret = kernel_create_event(event, kchan, - filter_expression, filter); + ret = kernel_create_event(event, kchan, filter_expression, filter); /* We have passed ownership */ filter_expression = NULL; filter = NULL; - if (ret < 0) { - switch (-ret) { - case EEXIST: - ret = LTTNG_ERR_KERN_EVENT_EXIST; - break; - case ENOSYS: - ret = LTTNG_ERR_KERN_EVENT_ENOSYS; - break; - default: - ret = LTTNG_ERR_KERN_ENABLE_FAIL; - break; - } + if (ret) { goto end; } } else if (kevent->enabled == 0) { @@ -194,7 +155,7 @@ end: int event_ust_enable_tracepoint(struct ltt_ust_session *usess, struct ltt_ust_channel *uchan, struct lttng_event *event, char *filter_expression, - struct lttng_filter_bytecode *filter, + struct lttng_bytecode *filter, struct lttng_event_exclusion *exclusion, bool internal_event) { @@ -208,16 +169,16 @@ int event_ust_enable_tracepoint(struct ltt_ust_session *usess, rcu_read_lock(); uevent = trace_ust_find_event(uchan->events, event->name, filter, - event->loglevel_type, event->loglevel, exclusion); + (enum lttng_ust_loglevel_type) event->loglevel_type, + event->loglevel, exclusion); if (!uevent) { - uevent = trace_ust_create_event(event, filter_expression, - filter, exclusion, internal_event); + ret = trace_ust_create_event(event, filter_expression, + filter, exclusion, internal_event, &uevent); /* We have passed ownership */ filter_expression = NULL; filter = NULL; exclusion = NULL; - if (uevent == NULL) { - ret = LTTNG_ERR_UST_ENABLE_FAIL; + if (ret != LTTNG_OK) { goto error; } @@ -227,11 +188,20 @@ int event_ust_enable_tracepoint(struct ltt_ust_session *usess, if (uevent->enabled) { /* It's already enabled so everything is OK */ + assert(!to_create); ret = LTTNG_ERR_UST_EVENT_ENABLED; goto end; } uevent->enabled = 1; + if (to_create) { + /* Add ltt ust event to channel */ + add_unique_ust_event(uchan->events, uevent); + } + + if (!usess->active) { + goto end; + } if (to_create) { /* Create event on all UST registered apps for session */ @@ -251,11 +221,6 @@ int event_ust_enable_tracepoint(struct ltt_ust_session *usess, } } - if (to_create) { - /* Add ltt ust event to channel */ - add_unique_ust_event(uchan->events, uevent); - } - DBG("Event UST %s %s in channel %s", uevent->attr.name, to_create ? "created" : "enabled", uchan->name); @@ -291,7 +256,7 @@ error: * Disable UST tracepoint of a channel from a UST session. */ int event_ust_disable_tracepoint(struct ltt_ust_session *usess, - struct ltt_ust_channel *uchan, char *event_name) + struct ltt_ust_channel *uchan, const char *event_name) { int ret; struct ltt_ust_event *uevent; @@ -328,17 +293,18 @@ int event_ust_disable_tracepoint(struct ltt_ust_session *usess, /* It's already disabled so everything is OK */ goto next; } + uevent->enabled = 0; + DBG2("Event UST %s disabled in channel %s", uevent->attr.name, + uchan->name); + if (!usess->active) { + goto next; + } ret = ust_app_disable_event_glb(usess, uchan, uevent); if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { ret = LTTNG_ERR_UST_DISABLE_FAIL; goto error; } - uevent->enabled = 0; - - DBG2("Event UST %s disabled in channel %s", uevent->attr.name, - uchan->name); - next: /* Get next duplicate event by name. */ cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name, @@ -353,6 +319,73 @@ error: return ret; } +/* + * Disable all UST tracepoints for a channel from a UST session. + */ +int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, + struct ltt_ust_channel *uchan) +{ + int ret, i, size, error = 0; + struct lttng_ht_iter iter; + struct ltt_ust_event *uevent = NULL; + struct lttng_event *events = NULL; + + assert(usess); + assert(uchan); + + rcu_read_lock(); + + /* Disabling existing events */ + cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, + node.node) { + if (uevent->enabled == 1) { + ret = event_ust_disable_tracepoint(usess, uchan, + uevent->attr.name); + if (ret < 0) { + error = LTTNG_ERR_UST_DISABLE_FAIL; + continue; + } + } + } + + /* Get all UST available events */ + size = ust_app_list_events(&events); + if (size < 0) { + ret = LTTNG_ERR_UST_LIST_FAIL; + goto error; + } + + for (i = 0; i < size; i++) { + ret = event_ust_disable_tracepoint(usess, uchan, + events[i].name); + if (ret < 0) { + /* Continue to disable the rest... */ + error = LTTNG_ERR_UST_DISABLE_FAIL; + continue; + } + } + + ret = error ? error : LTTNG_OK; +error: + rcu_read_unlock(); + free(events); + return ret; +} + +static void agent_enable_all(struct agent *agt) +{ + struct agent_event *aevent; + struct lttng_ht_iter iter; + + /* Flag every event that they are now enabled. */ + rcu_read_lock(); + cds_lfht_for_each_entry ( + agt->events->ht, &iter.iter, aevent, node.node) { + aevent->enabled = 1; + } + rcu_read_unlock(); +} + /* * Enable all agent event for a given UST session. * @@ -360,11 +393,9 @@ error: */ int event_agent_enable_all(struct ltt_ust_session *usess, struct agent *agt, struct lttng_event *event, - struct lttng_filter_bytecode *filter ,char *filter_expression) + struct lttng_bytecode *filter ,char *filter_expression) { int ret; - struct agent_event *aevent; - struct lttng_ht_iter iter; assert(usess); @@ -376,13 +407,7 @@ int event_agent_enable_all(struct ltt_ust_session *usess, goto error; } - /* Flag every event that they are now enabled. */ - rcu_read_lock(); - cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent, - node.node) { - aevent->enabled = 1; - } - rcu_read_unlock(); + agent_enable_all(agt); ret = LTTNG_OK; @@ -391,29 +416,82 @@ error: } /* - * Enable a single agent event for a given UST session. - * - * Return LTTNG_OK on success or else a LTTNG_ERR* code. + * Check if this event's filter requires the activation of application contexts + * and enable them in the agent. + * TODO: bytecode iterator does not support non-legacy application + * contexts yet. Not an issue for now, since they are not generated by + * the lttng-ctl library. */ -int event_agent_enable(struct ltt_ust_session *usess, - struct agent *agt, struct lttng_event *event, - struct lttng_filter_bytecode *filter, +static int add_filter_app_ctx(struct lttng_bytecode *bytecode, + const char *filter_expression, struct agent *agt) +{ + int ret = LTTNG_OK; + char *provider_name = NULL, *ctx_name = NULL; + struct bytecode_symbol_iterator *it = + bytecode_symbol_iterator_create(bytecode); + + if (!it) { + ret = LTTNG_ERR_NOMEM; + goto end; + } + + do { + struct lttng_event_context ctx; + const char *symbol_name = + bytecode_symbol_iterator_get_name(it); + + if (parse_application_context(symbol_name, &provider_name, + &ctx_name)) { + /* Not an application context. */ + continue; + } + + ctx.ctx = LTTNG_EVENT_CONTEXT_APP_CONTEXT; + ctx.u.app_ctx.provider_name = provider_name; + ctx.u.app_ctx.ctx_name = ctx_name; + + /* Recognized an application context. */ + DBG("Enabling event with filter expression \"%s\" requires enabling the %s:%s application context.", + filter_expression, provider_name, ctx_name); + + ret = agent_add_context(&ctx, agt); + if (ret != LTTNG_OK) { + ERR("Failed to add application context %s:%s.", + provider_name, ctx_name); + goto end; + } + + ret = agent_enable_context(&ctx, agt->domain); + if (ret != LTTNG_OK) { + ERR("Failed to enable application context %s:%s.", + provider_name, ctx_name); + goto end; + } + + free(provider_name); + free(ctx_name); + provider_name = ctx_name = NULL; + } while (bytecode_symbol_iterator_next(it) == 0); +end: + free(provider_name); + free(ctx_name); + bytecode_symbol_iterator_destroy(it); + return ret; +} + +static int agent_enable(struct agent *agt, + struct lttng_event *event, + struct lttng_bytecode *filter, char *filter_expression) { int ret, created = 0; struct agent_event *aevent; - assert(usess); assert(event); assert(agt); - DBG("Event agent enabling %s for session %" PRIu64 " with loglevel type %d " - ", loglevel %d and filter \"%s\"", event->name, - usess->id, event->loglevel_type, event->loglevel, - filter_expression ? filter_expression : "NULL"); - aevent = agent_find_event(event->name, event->loglevel_type, - event->loglevel, agt); + event->loglevel, filter_expression, agt); if (!aevent) { aevent = agent_create_event(event->name, event->loglevel_type, event->loglevel, filter, @@ -422,11 +500,23 @@ int event_agent_enable(struct ltt_ust_session *usess, ret = LTTNG_ERR_NOMEM; goto error; } + filter = NULL; + filter_expression = NULL; created = 1; + assert(!aevent->enabled); + } + + if (created && aevent->filter) { + ret = add_filter_app_ctx( + aevent->filter, aevent->filter_expression, agt); + if (ret != LTTNG_OK) { + goto error; + } } /* Already enabled? */ if (aevent->enabled) { + ret = LTTNG_OK; goto end; } @@ -440,13 +530,122 @@ int event_agent_enable(struct ltt_ust_session *usess, agent_add_event(aevent, agt); } -end: - return LTTNG_OK; + ret = LTTNG_OK; + goto end; error: if (created) { agent_destroy_event(aevent); } +end: + free(filter); + free(filter_expression); + return ret; +} + +/* + * Enable a single agent event for a given UST session. + * + * Return LTTNG_OK on success or else a LTTNG_ERR* code. + */ +int event_agent_enable(struct ltt_ust_session *usess, + struct agent *agt, + struct lttng_event *event, + struct lttng_bytecode *filter, + char *filter_expression) +{ + assert(usess); + assert(event); + assert(agt); + + DBG("Event agent enabling %s for session %" PRIu64 + " with loglevel type %d " + ", loglevel %d and filter \"%s\"", + event->name, usess->id, event->loglevel_type, + event->loglevel, + filter_expression ? filter_expression : "NULL"); + + return agent_enable(agt, event, filter, filter_expression); +} + +/* + * Enable a single agent event for a trigger. + * + * Return LTTNG_OK on success or else a LTTNG_ERR* code. + */ +int trigger_agent_enable(const struct lttng_trigger *trigger, struct agent *agt) +{ + int ret; + enum lttng_condition_status c_status; + enum lttng_domain_type d_type; + const struct lttng_condition *condition; + const struct lttng_event_rule *rule; + const char *filter_expression; + char *filter_expression_copy = NULL; + const struct lttng_bytecode *filter_bytecode; + struct lttng_bytecode *filter_bytecode_copy = NULL; + struct lttng_event *event = NULL; + + assert(trigger); + assert(agt); + + condition = lttng_trigger_get_const_condition(trigger); + + assert(lttng_condition_get_type(condition) == + LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); + + c_status = lttng_condition_event_rule_get_rule(condition, &rule); + assert(c_status == LTTNG_CONDITION_STATUS_OK); + + assert(lttng_event_rule_get_type(rule) == + LTTNG_EVENT_RULE_TYPE_TRACEPOINT); + + d_type = lttng_event_rule_get_domain_type(rule); + assert(d_type == agt->domain); + + event = lttng_event_rule_generate_lttng_event(rule); + if (!event) { + ret = LTTNG_ERR_NOMEM; + goto end; + } + + /* Get the internal filter_expression and bytecode */ + filter_expression = lttng_event_rule_get_filter(rule); + if (filter_expression) { + filter_expression_copy = strdup(filter_expression); + if (!filter_expression_copy) { + ret = LTTNG_ERR_NOMEM; + goto end; + } + + /* Get the filter bytecode */ + filter_bytecode = lttng_event_rule_get_filter_bytecode(rule); + if (filter_bytecode) { + filter_bytecode_copy = bytecode_copy (filter_bytecode); + if (!filter_bytecode_copy) { + ret = LTTNG_ERR_NOMEM; + goto end; + } + } + } + + DBG("Event agent enabling %s for trigger %" PRIu64 + " with loglevel type %d " + ", loglevel %d and filter \"%s\"", + event->name, lttng_trigger_get_tracer_token(trigger), + event->loglevel_type, event->loglevel, + filter_expression ? filter_expression : "NULL"); + + ret = agent_enable(agt, event, filter_bytecode_copy, + filter_expression_copy); + /* Ownership was passed even in case of error */ + filter_expression_copy = NULL; + filter_bytecode_copy = NULL; + +end: + free(filter_expression_copy); + free(filter_bytecode_copy); + free(event); return ret; } @@ -475,6 +674,43 @@ const char *event_get_default_agent_ust_name(enum lttng_domain_type domain) return default_event_name; } +static int trigger_agent_disable_one(const struct lttng_trigger *trigger, + struct agent *agt, + struct agent_event *aevent) + +{ + int ret; + + assert(agt); + assert(trigger); + assert(aevent); + + /* + * Actual ust event un-registration happens on the trigger + * un-registration at that point. + */ + + DBG("Event agent disabling %s (loglevel type %d, loglevel value %d) for trigger %" PRIu64, + aevent->name, aevent->loglevel_type, + aevent->loglevel_value, lttng_trigger_get_tracer_token(trigger)); + + /* Already disabled? */ + if (!aevent->enabled) { + goto end; + } + + ret = agent_disable_event(aevent, agt->domain); + if (ret != LTTNG_OK) { + goto error; + } + +end: + return LTTNG_OK; + +error: + return ret; +} + /* * Disable a given agent event for a given UST session. * @@ -541,10 +777,12 @@ static int event_agent_disable_one(struct ltt_ust_session *usess, /* If the agent event exists, it must be available on the UST side. */ assert(uevent); - ret = ust_app_disable_event_glb(usess, uchan, uevent); - if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { - ret = LTTNG_ERR_UST_DISABLE_FAIL; - goto error; + if (usess->active) { + ret = ust_app_disable_event_glb(usess, uchan, uevent); + if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { + ret = LTTNG_ERR_UST_DISABLE_FAIL; + goto error; + } } /* @@ -565,13 +803,51 @@ error: return ret; } +/* + * Disable agent event matching a given trigger. + * + * Return LTTNG_OK on success or else a LTTNG_ERR* code. + */ +int trigger_agent_disable( + const struct lttng_trigger *trigger, struct agent *agt) +{ + int ret = LTTNG_OK; + struct agent_event *aevent; + + assert(trigger); + assert(agt); + + DBG("Event agent disabling for trigger %" PRIu64, + lttng_trigger_get_tracer_token(trigger)); + + rcu_read_lock(); + aevent = agent_find_event_by_trigger(trigger, agt); + + if (aevent == NULL) { + DBG2("Event agent NOT found by trigger %" PRIu64, + lttng_trigger_get_tracer_token(trigger)); + ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; + goto end; + } + + ret = trigger_agent_disable_one(trigger, agt, aevent); + + if (ret != LTTNG_OK) { + goto end; + } + +end: + rcu_read_unlock(); + return ret; +} + /* * Disable all agent events matching a given name for a given UST session. * * Return LTTNG_OK on success or else a LTTNG_ERR* code. */ int event_agent_disable(struct ltt_ust_session *usess, struct agent *agt, - char *event_name) + const char *event_name) { int ret = LTTNG_OK; struct agent_event *aevent;