X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fevent.c;h=8cca21391d43dd9b20b877bc920e14d10c1a348e;hp=a2e6c37effb853d43385cd5da1a4b89de11957c1;hb=fb27f84c28e9d8ec7c8ce5ac1b541b0671a4569e;hpb=49c336c1679295a31b92223dca05feccfe3e3464 diff --git a/src/bin/lttng-sessiond/event.c b/src/bin/lttng-sessiond/event.c index a2e6c37ef..8cca21391 100644 --- a/src/bin/lttng-sessiond/event.c +++ b/src/bin/lttng-sessiond/event.c @@ -16,6 +16,7 @@ */ #define _GNU_SOURCE +#define _LGPL_SOURCE #include #include #include @@ -27,60 +28,51 @@ #include "channel.h" #include "event.h" #include "kernel.h" +#include "lttng-sessiond.h" #include "ust-ctl.h" #include "ust-app.h" #include "trace-kernel.h" #include "trace-ust.h" +#include "agent.h" /* - * Setup a lttng_event used to enable *all* syscall tracing. + * Add unique UST event based on the event name, filter bytecode and loglevel. */ -static void init_syscalls_kernel_event(struct lttng_event *event) +static void add_unique_ust_event(struct lttng_ht *ht, + struct ltt_ust_event *event) { - event->name[0] = '\0'; - /* - * We use LTTNG_EVENT* here since the trace kernel creation will make the - * right changes for the kernel. - */ - event->type = LTTNG_EVENT_SYSCALL; -} - -/* - * Return 1 if loglevels match or 0 on failure. - */ -static int loglevel_match(struct ltt_ust_event *uevent, - enum lttng_ust_loglevel_type log_type, int loglevel) -{ - /* - * For the loglevel type ALL, the loglevel is set to -1 but the event - * received by the session daemon is 0 which does not match the negative - * value in the existing event. - */ - if (log_type == LTTNG_UST_LOGLEVEL_ALL) { - loglevel = -1; - } - - if (uevent == NULL || uevent->attr.loglevel_type != log_type || - uevent->attr.loglevel != loglevel) { - goto no_match; - } - - return 1; - -no_match: - return 0; + struct cds_lfht_node *node_ptr; + struct ltt_ust_ht_key key; + + assert(ht); + assert(ht->ht); + assert(event); + + key.name = event->attr.name; + key.filter = (struct lttng_filter_bytecode *) event->filter; + key.loglevel_type = event->attr.loglevel_type; + key.loglevel_value = event->attr.loglevel; + key.exclusion = event->exclusion; + + node_ptr = cds_lfht_add_unique(ht->ht, + ht->hash_fct(event->node.key, lttng_ht_seed), + trace_ust_ht_match_event, &key, &event->node.node); + assert(node_ptr == &event->node.node); } /* * Disable kernel tracepoint event for a channel from the kernel session. */ -int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession, - struct ltt_kernel_channel *kchan, char *event_name) +int event_kernel_disable_event(struct ltt_kernel_channel *kchan, + char *event_name) { int ret; struct ltt_kernel_event *kevent; - kevent = trace_kernel_get_event_by_name(event_name, kchan); + 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; @@ -104,14 +96,18 @@ error: /* * Disable kernel tracepoint events for a channel from the kernel session. */ -int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession, - struct ltt_kernel_channel *kchan) +int event_kernel_disable_event_type(struct ltt_kernel_channel *kchan, + enum lttng_event_type type) { int ret; struct ltt_kernel_event *kevent; + assert(kchan); + /* For each event in the kernel session */ cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { + if (type != LTTNG_EVENT_ALL && kevent->type != type) + continue; ret = kernel_disable_event(kevent); if (ret < 0) { /* We continue disabling the rest */ @@ -122,43 +118,36 @@ int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession, return ret; } -/* - * Disable kernel syscall events for a channel from the kernel session. - */ -int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession, - struct ltt_kernel_channel *kchan) -{ - ERR("Cannot disable syscall tracing for existing session. Please destroy session instead."); - return LTTNG_OK; /* Return OK so disable all succeeds */ -} - /* * Disable all kernel event for a channel from the kernel session. */ -int event_kernel_disable_all(struct ltt_kernel_session *ksession, - struct ltt_kernel_channel *kchan) +int event_kernel_disable_event_all(struct ltt_kernel_channel *kchan) { - int ret; - - ret = event_kernel_disable_all_tracepoints(ksession, kchan); - if (ret != LTTNG_OK) - return ret; - ret = event_kernel_disable_all_syscalls(ksession, kchan); - return ret; + return event_kernel_disable_event_type(kchan, LTTNG_EVENT_ALL); } /* * Enable kernel tracepoint event for a channel from the kernel session. + * We own filter_expression and filter. */ -int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession, - struct ltt_kernel_channel *kchan, struct lttng_event *event) +int event_kernel_enable_event(struct ltt_kernel_channel *kchan, + struct lttng_event *event, char *filter_expression, + struct lttng_filter_bytecode *filter) { int ret; struct ltt_kernel_event *kevent; - kevent = trace_kernel_get_event_by_name(event->name, kchan); + assert(kchan); + assert(event); + + kevent = trace_kernel_find_event(event->name, kchan, + event->type, filter); if (kevent == NULL) { - ret = kernel_create_event(event, kchan); + 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: @@ -187,438 +176,481 @@ int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession, ret = LTTNG_OK; end: + free(filter_expression); + free(filter); return ret; } /* - * Enable all kernel tracepoint events of a channel of the kernel session. + * ============================ + * UST : The Ultimate Frontier! + * ============================ + */ + +/* + * Enable UST tracepoint event for a channel from a UST session. + * We own filter_expression, filter, and exclusion. */ -int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession, - struct ltt_kernel_channel *kchan, int kernel_tracer_fd) +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_event_exclusion *exclusion, + bool internal_event) { - int size, i, ret; - struct ltt_kernel_event *kevent; - struct lttng_event *event_list = NULL; + int ret = LTTNG_OK, to_create = 0; + struct ltt_ust_event *uevent; - /* For each event in the kernel session */ - cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { - if (kevent->enabled == 0) { - ret = kernel_enable_event(kevent); - if (ret < 0) { - /* Enable failed but still continue */ - continue; - } + assert(usess); + assert(uchan); + assert(event); + + rcu_read_lock(); + + uevent = trace_ust_find_event(uchan->events, event->name, filter, + event->loglevel_type, event->loglevel, exclusion); + if (!uevent) { + uevent = trace_ust_create_event(event, filter_expression, + filter, exclusion, internal_event); + /* We have passed ownership */ + filter_expression = NULL; + filter = NULL; + exclusion = NULL; + if (uevent == NULL) { + ret = LTTNG_ERR_UST_ENABLE_FAIL; + goto error; } - } - size = kernel_list_events(kernel_tracer_fd, &event_list); - if (size < 0) { - ret = LTTNG_ERR_KERN_LIST_FAIL; - goto end; + /* Valid to set it after the goto error since uevent is still NULL */ + to_create = 1; } - for (i = 0; i < size; i++) { - kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); - if (kevent == NULL) { - /* Default event type for enable all */ - event_list[i].type = LTTNG_EVENT_TRACEPOINT; - /* Enable each single tracepoint event */ - ret = kernel_create_event(&event_list[i], kchan); - if (ret < 0) { - /* Ignore error here and continue */ - } - } + if (uevent->enabled) { + /* It's already enabled so everything is OK */ + ret = LTTNG_ERR_UST_EVENT_ENABLED; + goto end; } - free(event_list); - ret = LTTNG_OK; -end: - return ret; - -} - -/* - * Enable all kernel tracepoint events of a channel of the kernel session. - */ -int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession, - struct ltt_kernel_channel *kchan, int kernel_tracer_fd) -{ - int ret; - struct lttng_event event; - - init_syscalls_kernel_event(&event); + uevent->enabled = 1; - DBG("Enabling all syscall tracing"); + if (to_create) { + /* Create event on all UST registered apps for session */ + ret = ust_app_create_event_glb(usess, uchan, uevent); + } else { + /* Enable event on all UST registered apps for session */ + ret = ust_app_enable_event_glb(usess, uchan, uevent); + } - ret = kernel_create_event(&event, kchan); if (ret < 0) { - if (ret == -EEXIST) { - ret = LTTNG_ERR_KERN_EVENT_EXIST; + if (ret == -LTTNG_UST_ERR_EXIST) { + ret = LTTNG_ERR_UST_EVENT_EXIST; + goto end; } else { - ret = LTTNG_ERR_KERN_ENABLE_FAIL; + ret = LTTNG_ERR_UST_ENABLE_FAIL; + goto error; } - goto end; } + 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); + ret = LTTNG_OK; + end: + rcu_read_unlock(); + free(filter_expression); + free(filter); + free(exclusion); return ret; -} - -/* - * Enable all kernel events of a channel of the kernel session. - */ -int event_kernel_enable_all(struct ltt_kernel_session *ksession, - struct ltt_kernel_channel *kchan, int kernel_tracer_fd) -{ - int tp_ret; - - tp_ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd); - if (tp_ret != LTTNG_OK) { - goto end; - } +error: /* - * Reaching this code path means that all tracepoints were enabled without - * errors so we ignore the error value of syscalls. - * - * At the moment, failing to enable syscalls on "lttng enable-event -a -k" - * is not considered an error that need to be returned to the client since - * tracepoints did not fail. Future work will allow us to send back - * multiple errors to the client in one API call. + * Only destroy event on creation time (not enabling time) because if the + * event is found in the channel (to_create == 0), it means that at some + * point the enable_event worked and it's thus valid to keep it alive. + * Destroying it also implies that we also destroy it's shadow copy to sync + * everyone up. */ - (void) event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd); - -end: - return tp_ret; + if (to_create) { + /* In this code path, the uevent was not added to the hash table */ + trace_ust_destroy_event(uevent); + } + rcu_read_unlock(); + free(filter_expression); + free(filter); + free(exclusion); + return ret; } /* - * ============================ - * UST : The Ultimate Frontier! - * ============================ - */ - -/* - * Enable all UST tracepoints for a channel from a UST session. + * Disable UST tracepoint of a channel from a UST session. */ -int event_ust_enable_all_tracepoints(struct ltt_ust_session *usess, int domain, - struct ltt_ust_channel *uchan) +int event_ust_disable_tracepoint(struct ltt_ust_session *usess, + struct ltt_ust_channel *uchan, char *event_name) { - int ret, i, size; + int ret; + struct ltt_ust_event *uevent; + struct lttng_ht_node_str *node; struct lttng_ht_iter iter; - struct ltt_ust_event *uevent = NULL; - struct lttng_event *events = NULL; + struct lttng_ht *ht; - switch (domain) { - case LTTNG_DOMAIN_UST: - { - /* Enable existing events */ - cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, - node.node) { - if (uevent->enabled == 0) { - ret = ust_app_enable_event_glb(usess, uchan, uevent); - if (ret < 0) { - continue; - } - uevent->enabled = 1; - } - } + assert(usess); + assert(uchan); + assert(event_name); - /* Get all UST available events */ - size = ust_app_list_events(&events); - if (size < 0) { - ret = LTTNG_ERR_UST_LIST_FAIL; - goto error; - } + ht = uchan->events; - for (i = 0; i < size; i++) { - /* - * Check if event exist and if so, continue since it was enable - * previously. - */ - uevent = trace_ust_find_event_by_name(uchan->events, - events[i].name); - if (uevent != NULL) { - ret = ust_app_enable_event_pid(usess, uchan, uevent, - events[i].pid); - if (ret < 0) { - if (ret != -LTTNG_UST_ERR_EXIST) { - ret = LTTNG_ERR_UST_ENABLE_FAIL; - goto error; - } - } - continue; - } + rcu_read_lock(); - /* Create ust event */ - uevent = trace_ust_create_event(&events[i]); - if (uevent == NULL) { - ret = LTTNG_ERR_FATAL; - goto error_destroy; - } + /* + * We use a custom lookup since we need the iterator for the next_duplicate + * call in the do while loop below. + */ + cds_lfht_lookup(ht->ht, ht->hash_fct((void *) event_name, lttng_ht_seed), + trace_ust_ht_match_event_by_name, event_name, &iter.iter); + node = lttng_ht_iter_get_node_str(&iter); + if (node == NULL) { + DBG2("Trace UST event NOT found by name %s", event_name); + ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; + goto error; + } - /* Create event for the specific PID */ - ret = ust_app_enable_event_pid(usess, uchan, uevent, - events[i].pid); - if (ret < 0) { - if (ret == -LTTNG_UST_ERR_EXIST) { - ret = LTTNG_ERR_UST_EVENT_EXIST; - goto error; - } else { - ret = LTTNG_ERR_UST_ENABLE_FAIL; - goto error_destroy; - } - } + do { + uevent = caa_container_of(node, struct ltt_ust_event, node); + assert(uevent); - uevent->enabled = 1; - /* Add ltt ust event to channel */ - rcu_read_lock(); - lttng_ht_add_unique_str(uchan->events, &uevent->node); - rcu_read_unlock(); + if (uevent->enabled == 0) { + /* It's already disabled so everything is OK */ + goto next; } - free(events); - break; - } -#if 0 - case LTTNG_DOMAIN_UST_EXEC_NAME: - case LTTNG_DOMAIN_UST_PID: - case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: -#endif - default: - ret = LTTNG_ERR_UND; - goto error; - } + 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; - return LTTNG_OK; + 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, + event_name, &iter.iter); + node = lttng_ht_iter_get_node_str(&iter); + } while (node); -error_destroy: - trace_ust_destroy_event(uevent); + ret = LTTNG_OK; error: - free(events); + rcu_read_unlock(); return ret; } /* - * Enable UST tracepoint event for a channel from a UST session. + * Enable all agent event for a given UST session. + * + * Return LTTNG_OK on success or else a LTTNG_ERR* code. */ -int event_ust_enable_tracepoint(struct ltt_ust_session *usess, int domain, - struct ltt_ust_channel *uchan, struct lttng_event *event) +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) { - int ret = LTTNG_OK, to_create = 0; - struct ltt_ust_event *uevent; + int ret; + struct agent_event *aevent; + struct lttng_ht_iter iter; - uevent = trace_ust_find_event_by_name(uchan->events, event->name); - if (uevent == NULL) { - uevent = trace_ust_create_event(event); - if (uevent == NULL) { - ret = LTTNG_ERR_UST_ENABLE_FAIL; - goto error; - } - /* Valid to set it after the goto error since uevent is still NULL */ - to_create = 1; - } + assert(usess); + + DBG("Event agent enabling ALL events for session %" PRIu64, usess->id); - /* Check loglevels */ - ret = loglevel_match(uevent, event->loglevel_type, event->loglevel); - if (ret == 0) { - /* - * No match meaning that the user tried to enable a known event but - * with a different loglevel. - */ - DBG("Enable event %s does not match existing event %s with loglevel " - "respectively of %d and %d", event->name, uevent->attr.name, - uevent->attr.loglevel, event->loglevel); - ret = LTTNG_ERR_EVENT_EXIST_LOGLEVEL; + /* Enable event on agent application through TCP socket. */ + ret = event_agent_enable(usess, agt, event, filter, filter_expression); + if (ret != LTTNG_OK) { goto error; } - if (uevent->enabled) { - /* It's already enabled so everything is OK */ - ret = LTTNG_OK; - goto end; + /* 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(); - uevent->enabled = 1; + ret = LTTNG_OK; - switch (domain) { - case LTTNG_DOMAIN_UST: - { - if (to_create) { - /* Create event on all UST registered apps for session */ - ret = ust_app_create_event_glb(usess, uchan, uevent); - } else { - /* Enable event on all UST registered apps for session */ - ret = ust_app_enable_event_glb(usess, uchan, uevent); - } +error: + return ret; +} - if (ret < 0) { - if (ret == -LTTNG_UST_ERR_EXIST) { - ret = LTTNG_ERR_UST_EVENT_EXIST; - goto end; - } else { - ret = LTTNG_ERR_UST_ENABLE_FAIL; - goto error; - } +/* + * 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_filter_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); + if (!aevent) { + aevent = agent_create_event(event->name, event->loglevel_type, + event->loglevel, filter, + filter_expression); + if (!aevent) { + ret = LTTNG_ERR_NOMEM; + goto error; } - break; + created = 1; } -#if 0 - case LTTNG_DOMAIN_UST_EXEC_NAME: - case LTTNG_DOMAIN_UST_PID: - case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: -#endif - default: - ret = LTTNG_ERR_UND; + + /* Already enabled? */ + if (aevent->enabled) { goto end; } - if (to_create) { - rcu_read_lock(); - /* Add ltt ust event to channel */ - lttng_ht_add_unique_str(uchan->events, &uevent->node); - rcu_read_unlock(); + ret = agent_enable_event(aevent, agt->domain); + if (ret != LTTNG_OK) { + goto error; } - DBG("Event UST %s %s in channel %s", uevent->attr.name, - to_create ? "created" : "enabled", uchan->name); - - ret = LTTNG_OK; + /* If the event was created prior to the enable, add it to the domain. */ + if (created) { + agent_add_event(aevent, agt); + } end: - return ret; + return LTTNG_OK; error: - /* - * Only destroy event on creation time (not enabling time) because if the - * event is found in the channel (to_create == 0), it means that at some - * point the enable_event worked and it's thus valid to keep it alive. - * Destroying it also implies that we also destroy it's shadow copy to sync - * everyone up. - */ - if (to_create) { - /* In this code path, the uevent was not added to the hash table */ - trace_ust_destroy_event(uevent); + if (created) { + agent_destroy_event(aevent); } return ret; } /* - * Disable UST tracepoint of a channel from a UST session. + * Return the default event name associated with the provided UST domain. Return + * NULL on error. */ -int event_ust_disable_tracepoint(struct ltt_ust_session *usess, int domain, - struct ltt_ust_channel *uchan, char *event_name) +const char *event_get_default_agent_ust_name(enum lttng_domain_type domain) +{ + const char *default_event_name = NULL; + + switch (domain) { + case LTTNG_DOMAIN_LOG4J: + default_event_name = DEFAULT_LOG4J_EVENT_NAME; + break; + case LTTNG_DOMAIN_JUL: + default_event_name = DEFAULT_JUL_EVENT_NAME; + break; + case LTTNG_DOMAIN_PYTHON: + default_event_name = DEFAULT_PYTHON_EVENT_NAME; + break; + default: + assert(0); + } + + return default_event_name; +} + +/* + * Disable a given agent event for a given UST session. + * + * Must be called with the RCU read lock held. + * Return LTTNG_OK on success or else a LTTNG_ERR* code. + */ +static int event_agent_disable_one(struct ltt_ust_session *usess, + struct agent *agt, struct agent_event *aevent) { int ret; - struct ltt_ust_event *uevent; + struct ltt_ust_event *uevent = NULL; + struct ltt_ust_channel *uchan = NULL; + const char *ust_event_name, *ust_channel_name; - uevent = trace_ust_find_event_by_name(uchan->events, event_name); - if (uevent == NULL) { - ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; + assert(agt); + assert(usess); + assert(aevent); + + DBG("Event agent disabling %s (loglevel type %d, loglevel value %d) for session %" PRIu64, + aevent->name, aevent->loglevel_type, aevent->loglevel_value, + usess->id); + + /* Already disabled? */ + if (!aevent->enabled) { + goto end; + } + + if (agt->domain == LTTNG_DOMAIN_JUL) { + ust_channel_name = DEFAULT_JUL_CHANNEL_NAME; + } else if (agt->domain == LTTNG_DOMAIN_LOG4J) { + ust_channel_name = DEFAULT_LOG4J_CHANNEL_NAME; + } else if (agt->domain == LTTNG_DOMAIN_PYTHON) { + ust_channel_name = DEFAULT_PYTHON_CHANNEL_NAME; + } else { + ret = LTTNG_ERR_INVALID; goto error; } - if (uevent->enabled == 0) { - /* It's already enabled so everything is OK */ - ret = LTTNG_OK; - goto end; + /* + * Disable it on the UST side. First get the channel reference then find + * the event and finally disable it. + */ + uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, + (char *) ust_channel_name); + if (!uchan) { + ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; + goto error; } - switch (domain) { - case LTTNG_DOMAIN_UST: - 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; - } - break; -#if 0 - case LTTNG_DOMAIN_UST_EXEC_NAME: - case LTTNG_DOMAIN_UST_PID: - case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: -#endif - default: - ret = LTTNG_ERR_UND; + ust_event_name = event_get_default_agent_ust_name(agt->domain); + if (!ust_event_name) { + ret = LTTNG_ERR_FATAL; goto error; } + /* + * Agent UST event has its loglevel type forced to + * LTTNG_UST_LOGLEVEL_ALL. The actual loglevel type/value filtering + * happens thanks to an UST filter. The following -1 is actually + * ignored since the type is LTTNG_UST_LOGLEVEL_ALL. + */ + uevent = trace_ust_find_event(uchan->events, (char *) ust_event_name, + aevent->filter, LTTNG_UST_LOGLEVEL_ALL, -1, NULL); + /* 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; + } + + /* + * Flag event that it's disabled so the shadow copy on the ust app side + * will disable it if an application shows up. + */ uevent->enabled = 0; - ret = LTTNG_OK; + + ret = agent_disable_event(aevent, agt->domain); + if (ret != LTTNG_OK) { + goto error; + } end: - DBG2("Event UST %s disabled in channel %s", uevent->attr.name, - uchan->name); + return LTTNG_OK; error: return ret; } /* - * Disable all UST tracepoints for a channel from a UST session. + * 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_ust_disable_all_tracepoints(struct ltt_ust_session *usess, int domain, - struct ltt_ust_channel *uchan) +int event_agent_disable(struct ltt_ust_session *usess, struct agent *agt, + char *event_name) { - int ret, i, size; + int ret = LTTNG_OK; + struct agent_event *aevent; struct lttng_ht_iter iter; - struct ltt_ust_event *uevent = NULL; - struct lttng_event *events = NULL; + struct lttng_ht_node_str *node; - switch (domain) { - case LTTNG_DOMAIN_UST: - { - /* Disabling existing events */ - cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, - node.node) { - if (uevent->enabled == 1) { - ret = ust_app_disable_event_glb(usess, uchan, uevent); - if (ret < 0) { - continue; - } - uevent->enabled = 0; - } - } + assert(agt); + assert(usess); + assert(event_name); - /* Get all UST available events */ - size = ust_app_list_events(&events); - if (size < 0) { - ret = LTTNG_ERR_UST_LIST_FAIL; - goto error; - } + DBG("Event agent disabling %s (all loglevels) for session %" PRIu64, event_name, usess->id); - for (i = 0; i < size; i++) { - uevent = trace_ust_find_event_by_name(uchan->events, - events[i].name); - if (uevent != NULL && uevent->enabled == 1) { - ret = ust_app_disable_event_pid(usess, uchan, uevent, - events[i].pid); - if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { - ret = LTTNG_ERR_UST_DISABLE_FAIL; - goto error; - } - uevent->enabled = 0; - continue; - } - } + rcu_read_lock(); + agent_find_events_by_name(event_name, agt, &iter); + node = lttng_ht_iter_get_node_str(&iter); - free(events); - break; + if (node == NULL) { + DBG2("Event agent NOT found by name %s", event_name); + ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; + goto end; } -#if 0 - case LTTNG_DOMAIN_UST_EXEC_NAME: - case LTTNG_DOMAIN_UST_PID: - case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: -#endif - default: - ret = LTTNG_ERR_UND; + + do { + aevent = caa_container_of(node, struct agent_event, node); + ret = event_agent_disable_one(usess, agt, aevent); + + if (ret != LTTNG_OK) { + goto end; + } + + /* Get next duplicate agent event by name. */ + agent_event_next_duplicate(event_name, agt, &iter); + node = lttng_ht_iter_get_node_str(&iter); + } while (node); +end: + rcu_read_unlock(); + return ret; +} +/* + * Disable all agent event for a given UST session. + * + * Return LTTNG_OK on success or else a LTTNG_ERR* code. + */ +int event_agent_disable_all(struct ltt_ust_session *usess, + struct agent *agt) +{ + int ret; + struct agent_event *aevent; + struct lttng_ht_iter iter; + + assert(agt); + assert(usess); + + /* + * Disable event on agent application. Continue to disable all other events + * if the * event is not found. + */ + ret = event_agent_disable(usess, agt, "*"); + if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_NOT_FOUND) { goto error; } - return LTTNG_OK; + /* Disable every event. */ + rcu_read_lock(); + cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent, + node.node) { + if (!aevent->enabled) { + continue; + } + + ret = event_agent_disable(usess, agt, aevent->name); + if (ret != LTTNG_OK) { + goto error_unlock; + } + } + ret = LTTNG_OK; +error_unlock: + rcu_read_unlock(); error: - free(events); return ret; }