From: Francis Deslauriers Date: Wed, 4 Nov 2020 23:10:52 +0000 (-0500) Subject: Extract synchronize tracer notifier functions X-Git-Tag: v2.13.0-rc1~189 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=989a08449dcb82204cd8caeb7841d5c20d32b475;p=lttng-tools.git Extract synchronize tracer notifier functions Signed-off-by: Francis Deslauriers Signed-off-by: Jérémie Galarneau Change-Id: I2d92227d93ede0b04bf7314ff819c2b777247262 --- diff --git a/src/bin/lttng-sessiond/cmd.c b/src/bin/lttng-sessiond/cmd.c index 131e93d0f..507937ca1 100644 --- a/src/bin/lttng-sessiond/cmd.c +++ b/src/bin/lttng-sessiond/cmd.c @@ -6,6 +6,7 @@ * */ +#include "bin/lttng-sessiond/session.h" #define _LGPL_SOURCE #include #include @@ -4293,21 +4294,89 @@ end: return ret; } -static enum lttng_error_code trigger_modifies_event_notifier( - const struct lttng_trigger *trigger, bool *adds_event_notifier) +static +enum lttng_error_code synchronize_tracer_notifier_register( + struct notification_thread_handle *notification_thread, + struct lttng_trigger *trigger, const struct lttng_credentials *cmd_creds) { - enum lttng_error_code ret_code = LTTNG_OK; - const struct lttng_condition *condition = NULL; + enum lttng_error_code ret_code; + struct lttng_condition *condition = lttng_trigger_get_condition(trigger); + const char *trigger_name; + uid_t trigger_owner; + enum lttng_trigger_status trigger_status; + const enum lttng_domain_type trigger_domain = + lttng_trigger_get_underlying_domain_type_restriction( + trigger); - condition = lttng_trigger_get_const_condition(trigger); - if (!condition) { - ret_code = LTTNG_ERR_INVALID_TRIGGER; - goto end; + trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner); + assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); + + assert(condition); + assert(lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_ON_EVENT); + + trigger_status = lttng_trigger_get_name(trigger, &trigger_name); + trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? + trigger_name : + "(unnamed)"; + + session_lock_list(); + switch (trigger_domain) { + case LTTNG_DOMAIN_KERNEL: + { + ret_code = kernel_register_event_notifier(trigger, cmd_creds); + if (ret_code != LTTNG_OK) { + enum lttng_error_code notif_thread_unregister_ret; + + notif_thread_unregister_ret = + notification_thread_command_unregister_trigger( + notification_thread, trigger); + + if (notif_thread_unregister_ret != LTTNG_OK) { + /* Return the original error code. */ + ERR("Failed to unregister trigger from notification thread during error recovery: trigger name = '%s', trigger owner uid = %d, error code = %d", + trigger_name, + (int) trigger_owner, + ret_code); + } + } + break; } + case LTTNG_DOMAIN_UST: + ust_app_global_update_all_event_notifier_rules(); + break; + case LTTNG_DOMAIN_JUL: + case LTTNG_DOMAIN_LOG4J: + case LTTNG_DOMAIN_PYTHON: + { + /* Agent domains. */ + struct agent *agt = agent_find_by_event_notifier_domain( + trigger_domain); - *adds_event_notifier = lttng_condition_get_type(condition) == - LTTNG_CONDITION_TYPE_ON_EVENT; -end: + if (!agt) { + agt = agent_create(trigger_domain); + if (!agt) { + ret_code = LTTNG_ERR_NOMEM; + goto end_unlock_session_list; + } + + agent_add(agt, trigger_agents_ht_by_domain); + } + + ret_code = trigger_agent_enable(trigger, agt); + if (ret_code != LTTNG_OK) { + goto end_unlock_session_list; + } + + break; + } + case LTTNG_DOMAIN_NONE: + default: + abort(); + } + + ret_code = LTTNG_OK; +end_unlock_session_list: + session_unlock_list(); return ret_code; } @@ -4317,7 +4386,6 @@ enum lttng_error_code cmd_register_trigger(const struct lttng_credentials *cmd_c struct lttng_trigger **return_trigger) { enum lttng_error_code ret_code; - bool must_update_event_notifiers; const char *trigger_name; uid_t trigger_owner; enum lttng_trigger_status trigger_status; @@ -4384,72 +4452,17 @@ enum lttng_error_code cmd_register_trigger(const struct lttng_credentials *cmd_c trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? trigger_name : "(unnamed)"; - ret_code = trigger_modifies_event_notifier(trigger, &must_update_event_notifiers); - if (ret_code != LTTNG_OK) { - ERR("Failed to determine if event modifies event notifiers: trigger name = '%s', trigger owner uid = %d, error code = %d", - trigger_name, (int) trigger_owner, ret_code); - goto end; - } - /* * Synchronize tracers if the trigger adds an event notifier. */ - if (must_update_event_notifiers) { - const enum lttng_domain_type trigger_domain = - lttng_trigger_get_underlying_domain_type_restriction(trigger); - - session_lock_list(); - switch (trigger_domain) { - case LTTNG_DOMAIN_KERNEL: - { - ret_code = kernel_register_event_notifier( - trigger, cmd_creds); - if (ret_code != LTTNG_OK) { - const enum lttng_error_code notif_thread_unregister_ret = - notification_thread_command_unregister_trigger( - notification_thread, - trigger); - - if (notif_thread_unregister_ret != LTTNG_OK) { - /* Return the original error code. */ - ERR("Failed to unregister trigger from notification thread during error recovery: trigger name = '%s', trigger owner uid = %d, error code = %d", - trigger_name, - (int) trigger_owner, - ret_code); - } - } - break; - } - case LTTNG_DOMAIN_UST: - ust_app_global_update_all_event_notifier_rules(); - break; - case LTTNG_DOMAIN_NONE: - abort(); - default: - { - /* Agent domains. */ - struct agent *agt = agent_find_by_event_notifier_domain( - trigger_domain); - - if (!agt) { - agt = agent_create(trigger_domain); - if (!agt) { - ret_code = LTTNG_ERR_NOMEM; - goto end_unlock_session_list; - } - agent_add(agt, trigger_agents_ht_by_domain); - } - - ret_code = trigger_agent_enable(trigger, agt); - if (ret_code != LTTNG_OK) { - goto end_unlock_session_list; - } - - break; - } + if (lttng_trigger_needs_tracer_notifier(trigger)) { + ret_code = synchronize_tracer_notifier_register(notification_thread, + trigger, cmd_creds); + if (ret_code != LTTNG_OK) { + ERR("Error registering tracer notifier: %s", + lttng_strerror(-ret_code)); + goto end; } - - session_unlock_list(); } /* @@ -4467,6 +4480,62 @@ enum lttng_error_code cmd_register_trigger(const struct lttng_credentials *cmd_c } end: return ret_code; +} + +static +enum lttng_error_code synchronize_tracer_notifier_unregister( + const struct lttng_trigger *trigger) +{ + enum lttng_error_code ret_code; + const struct lttng_condition *condition = + lttng_trigger_get_const_condition(trigger); + const enum lttng_domain_type trigger_domain = + lttng_trigger_get_underlying_domain_type_restriction( + trigger); + + assert(condition); + assert(lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_ON_EVENT); + + session_lock_list(); + switch (trigger_domain) { + case LTTNG_DOMAIN_KERNEL: + ret_code = kernel_unregister_event_notifier(trigger); + break; + case LTTNG_DOMAIN_UST: + ust_app_global_update_all_event_notifier_rules(); + break; + case LTTNG_DOMAIN_JUL: + case LTTNG_DOMAIN_LOG4J: + case LTTNG_DOMAIN_PYTHON: + { + /* Agent domains. */ + struct agent *agt = agent_find_by_event_notifier_domain( + trigger_domain); + + if (!agt) { + agt = agent_create(trigger_domain); + if (!agt) { + ret_code = LTTNG_ERR_NOMEM; + goto end_unlock_session_list; + } + + agent_add(agt, trigger_agents_ht_by_domain); + } + + ret_code = trigger_agent_disable(trigger, agt); + if (ret_code != LTTNG_OK) { + goto end_unlock_session_list; + } + + break; + } + case LTTNG_DOMAIN_NONE: + default: + abort(); + } + + ret_code = LTTNG_OK; + end_unlock_session_list: session_unlock_list(); return ret_code; @@ -4477,15 +4546,13 @@ enum lttng_error_code cmd_unregister_trigger(const struct lttng_credentials *cmd struct notification_thread_handle *notification_thread) { enum lttng_error_code ret_code; - bool must_update_event_notifiers; const char *trigger_name; uid_t trigger_owner; enum lttng_trigger_status trigger_status; trigger_status = lttng_trigger_get_name(trigger, &trigger_name); trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? trigger_name : "(unnamed)"; - trigger_status = lttng_trigger_get_owner_uid( - trigger, &trigger_owner); + trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner); assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); DBG("Running unregister trigger command: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", @@ -4509,13 +4576,6 @@ enum lttng_error_code cmd_unregister_trigger(const struct lttng_credentials *cmd } } - ret_code = trigger_modifies_event_notifier(trigger, &must_update_event_notifiers); - if (ret_code != LTTNG_OK) { - ERR("Failed to determine if event modifies event notifiers: trigger name = '%s', trigger owner uid = %d, error code = %d", - trigger_name, (int) trigger_owner, ret_code); - goto end; - } - ret_code = notification_thread_command_unregister_trigger(notification_thread, trigger); if (ret_code != LTTNG_OK) { @@ -4530,56 +4590,18 @@ enum lttng_error_code cmd_unregister_trigger(const struct lttng_credentials *cmd * the tracers from producing notifications associated with this * event notifier. */ - if (must_update_event_notifiers) { - const enum lttng_domain_type trigger_domain = - lttng_trigger_get_underlying_domain_type_restriction( - trigger); - - session_lock_list(); - switch (trigger_domain) { - case LTTNG_DOMAIN_KERNEL: - { - ret_code = kernel_unregister_event_notifier( - trigger); - break; - } - case LTTNG_DOMAIN_UST: - ust_app_global_update_all_event_notifier_rules(); - break; - case LTTNG_DOMAIN_NONE: - abort(); - default: - { - /* Agent domains. */ - struct agent *agt = agent_find_by_event_notifier_domain( - trigger_domain); - - if (!agt) { - agt = agent_create(trigger_domain); - if (!agt) { - ret_code = LTTNG_ERR_NOMEM; - goto end_unlock_session_list; - } - agent_add(agt, trigger_agents_ht_by_domain); - } - - ret_code = trigger_agent_disable(trigger, agt); - if (ret_code != LTTNG_OK) { - goto end_unlock_session_list; - } - - break; - } + if (lttng_trigger_needs_tracer_notifier(trigger)) { + ret_code = synchronize_tracer_notifier_unregister(trigger); + if (ret_code != LTTNG_OK) { + ERR("Error unregistering trigger to tracer."); + goto end; } - session_unlock_list(); } end: return ret_code; -end_unlock_session_list: - session_unlock_list(); - return ret_code;} +} int cmd_list_triggers(struct command_ctx *cmd_ctx, struct notification_thread_handle *notification_thread,