X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Flib%2Flttng-ctl%2Flttng-ctl.c;h=03b74c0b74771a9d0be8158f152a617123799c47;hp=779ee675fc92257e58c910dc4ee44703b3cfa08d;hb=2001793c1141e89b34e70efb28b27ec0cc8e6d47;hpb=1b18ce9394f3fb22b9bad54caffc3d8424de01ba diff --git a/src/lib/lttng-ctl/lttng-ctl.c b/src/lib/lttng-ctl/lttng-ctl.c index 779ee675f..03b74c0b7 100644 --- a/src/lib/lttng-ctl/lttng-ctl.c +++ b/src/lib/lttng-ctl/lttng-ctl.c @@ -4,6 +4,7 @@ * Linux Trace Toolkit Control Library * * Copyright (C) 2011 David Goulet + * Copyright (C) 2016 - Jérémie Galarneau * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License, version 2.1 only, @@ -19,7 +20,6 @@ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ -#define _GNU_SOURCE #define _LGPL_SOURCE #include #include @@ -198,9 +198,9 @@ end: } /* - * Check if we are in the specified group. + * Check if we are in the specified group. * - * If yes return 1, else return -1. + * If yes return 1, else return -1. */ LTTNG_HIDDEN int lttng_check_tracing_group(void) @@ -269,7 +269,7 @@ static int try_connect_sessiond(const char *sock_path) ret = lttcomm_connect_unix_sock(sock_path); if (ret < 0) { - /* Not alive */ + /* Not alive. */ goto error; } @@ -293,7 +293,7 @@ error: */ static int set_session_daemon_path(void) { - int in_tgroup = 0; /* In tracing group */ + int in_tgroup = 0; /* In tracing group. */ uid_t uid; uid = getuid(); @@ -312,7 +312,7 @@ static int set_session_daemon_path(void) int ret; if (in_tgroup) { - /* Tracing group */ + /* Tracing group. */ ret = try_connect_sessiond(sessiond_sock_path); if (ret >= 0) { goto end; @@ -322,8 +322,10 @@ static int set_session_daemon_path(void) /* ...or not in tracing group (and not root), default */ /* - * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; - * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) + * With GNU C < 2.1, snprintf returns -1 if the target buffer + * is too small; + * With GNU C >= 2.1, snprintf returns the required size + * (excluding closing null) */ ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path), DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir()); @@ -339,9 +341,9 @@ error: } /* - * Connect to the LTTng session daemon. + * Connect to the LTTng session daemon. * - * On success, return 0. On error, return -1. + * On success, return 0. On error, return -1. */ static int connect_sessiond(void) { @@ -357,7 +359,7 @@ static int connect_sessiond(void) goto error; } - /* Connect to the sesssion daemon */ + /* Connect to the sesssion daemon. */ ret = lttcomm_connect_unix_sock(sessiond_sock_path); if (ret < 0) { goto error; @@ -374,6 +376,7 @@ error: /* * Clean disconnect from the session daemon. + * * On success, return 0. On error, return -1. */ static int disconnect_sessiond(void) @@ -479,6 +482,7 @@ end: /* * Create lttng handle and return pointer. + * * The returned pointer will be NULL in case of malloc() error. */ struct lttng_handle *lttng_create_handle(const char *session_name, @@ -517,6 +521,7 @@ void lttng_destroy_handle(struct lttng_handle *handle) /* * Register an outside consumer. + * * Returns size of returned session payload data or a negative error code. */ int lttng_register_consumer(struct lttng_handle *handle, @@ -534,14 +539,16 @@ int lttng_register_consumer(struct lttng_handle *handle, sizeof(lsm.session.name)); lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); - lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path)); + lttng_ctl_copy_string(lsm.u.reg.path, socket_path, + sizeof(lsm.u.reg.path)); return lttng_ctl_ask_sessiond(&lsm, NULL); } /* - * Start tracing for all traces of the session. - * Returns size of returned session payload data or a negative error code. + * Start tracing for all traces of the session. + * + * Returns size of returned session payload data or a negative error code. */ int lttng_start_tracing(const char *session_name) { @@ -597,8 +604,8 @@ static int _lttng_stop_tracing(const char *session_name, int wait) } /* - * Data sleep time before retrying (in usec). Don't sleep if the call - * returned value indicates availability. + * Data sleep time before retrying (in usec). Don't sleep if the + * call returned value indicates availability. */ if (data_ret) { usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); @@ -638,15 +645,18 @@ int lttng_add_context(struct lttng_handle *handle, struct lttng_event_context *ctx, const char *event_name, const char *channel_name) { + int ret; + size_t len = 0; + char *buf = NULL; struct lttcomm_session_msg lsm; - /* Safety check. Both are mandatory */ + /* Safety check. Both are mandatory. */ if (handle == NULL || ctx == NULL) { - return -LTTNG_ERR_INVALID; + ret = -LTTNG_ERR_INVALID; + goto end; } memset(&lsm, 0, sizeof(lsm)); - lsm.cmd_type = LTTNG_ADD_CONTEXT; /* If no channel name, send empty string. */ @@ -659,20 +669,61 @@ int lttng_add_context(struct lttng_handle *handle, } lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); - - memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); - lttng_ctl_copy_string(lsm.session.name, handle->session_name, sizeof(lsm.session.name)); - return lttng_ctl_ask_sessiond(&lsm, NULL); + if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { + size_t provider_len, ctx_len; + const char *provider_name = ctx->u.app_ctx.provider_name; + const char *ctx_name = ctx->u.app_ctx.ctx_name; + + if (!provider_name || !ctx_name) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + + provider_len = strlen(provider_name); + if (provider_len == 0) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + lsm.u.context.provider_name_len = provider_len; + + ctx_len = strlen(ctx_name); + if (ctx_len == 0) { + ret = -LTTNG_ERR_INVALID; + goto end; + } + lsm.u.context.context_name_len = ctx_len; + + len = provider_len + ctx_len; + buf = zmalloc(len); + if (!buf) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + memcpy(buf, provider_name, provider_len); + memcpy(buf + provider_len, ctx_name, ctx_len); + } + memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); + /* Don't leak application addresses to the sessiond. */ + lsm.u.context.ctx.u.app_ctx.provider_name = NULL; + lsm.u.context.ctx.u.app_ctx.ctx_name = NULL; + + ret = lttng_ctl_ask_sessiond_varlen(&lsm, buf, len, NULL); +end: + free(buf); + return ret; } /* - * Enable event(s) for a channel. - * If no event name is specified, all events are enabled. - * If no channel name is specified, the default 'channel0' is used. - * Returns size of returned session payload data or a negative error code. + * Enable event(s) for a channel. + * + * If no event name is specified, all events are enabled. + * If no channel name is specified, the default 'channel0' is used. + * + * Returns size of returned session payload data or a negative error code. */ int lttng_enable_event(struct lttng_handle *handle, struct lttng_event *ev, const char *channel_name) @@ -759,7 +810,7 @@ error: } /* - * Generate the filter bytecode from a give filter expression string. Put the + * Generate the filter bytecode from a given filter expression string. Put the * newly allocated parser context in ctxp and populate the lsm object with the * expression len. * @@ -832,7 +883,7 @@ static int generate_filter(char *filter_expression, ret = -LTTNG_ERR_FILTER_INVAL; goto parse_error; } - /* Validate strings used as literals in the expression */ + /* Validate strings used as literals in the expression. */ ret = filter_visitor_ir_validate_string(ctx); if (ret) { ret = -LTTNG_ERR_FILTER_INVAL; @@ -905,7 +956,8 @@ int lttng_enable_event_with_exclusions(struct lttng_handle *handle, goto error; } - /* Empty filter string will always be rejected by the parser + /* + * Empty filter string will always be rejected by the parser * anyway, so treat this corner-case early to eliminate * lttng_fmemopen error for 0-byte allocation. */ @@ -954,10 +1006,10 @@ int lttng_enable_event_with_exclusions(struct lttng_handle *handle, /* * We have either a filter or some exclusions, so we need to set up - * a variable-length memory block from where to send the data + * a variable-length memory block from where to send the data. */ - /* Parse filter expression */ + /* Parse filter expression. */ if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL || handle->domain.type == LTTNG_DOMAIN_LOG4J || handle->domain.type == LTTNG_DOMAIN_PYTHON) { @@ -970,13 +1022,17 @@ int lttng_enable_event_with_exclusions(struct lttng_handle *handle, agent_filter = set_agent_filter(filter_expression, ev); if (!agent_filter) { if (!filter_expression) { - /* No JUL and no filter, just skip everything below. */ + /* + * No JUL and no filter, just skip + * everything below. + */ goto ask_sessiond; } } else { /* - * With an agent filter, the original filter has been added to - * it thus replace the filter expression. + * With an agent filter, the original filter has + * been added to it thus replace the filter + * expression. */ filter_expression = agent_filter; free_filter_expression = 1; @@ -997,19 +1053,20 @@ int lttng_enable_event_with_exclusions(struct lttng_handle *handle, goto mem_error; } - /* Put exclusion names first in the data */ + /* Put exclusion names first in the data. */ while (exclusion_count--) { strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count, - *(exclusion_list + exclusion_count), LTTNG_SYMBOL_NAME_LEN); + *(exclusion_list + exclusion_count), + LTTNG_SYMBOL_NAME_LEN - 1); } - /* Add filter expression next */ + /* Add filter expression next. */ if (lsm.u.enable.expression_len != 0) { memcpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count, filter_expression, lsm.u.enable.expression_len); } - /* Add filter bytecode next */ + /* Add filter bytecode next. */ if (ctx && lsm.u.enable.bytecode_len != 0) { memcpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count @@ -1020,7 +1077,8 @@ int lttng_enable_event_with_exclusions(struct lttng_handle *handle, ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data, (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) + - lsm.u.enable.bytecode_len + lsm.u.enable.expression_len, NULL); + lsm.u.enable.bytecode_len + lsm.u.enable.expression_len, + NULL); free(varlen_data); mem_error: @@ -1032,15 +1090,16 @@ mem_error: filter_error: if (free_filter_expression) { /* - * The filter expression has been replaced and must be freed as it is - * not the original filter expression received as a parameter. + * The filter expression has been replaced and must be freed as + * it is not the original filter expression received as a + * parameter. */ free(filter_expression); } error: /* - * Return directly to the caller and don't ask the sessiond since something - * went wrong in the parsing of data above. + * Return directly to the caller and don't ask the sessiond since + * something went wrong in the parsing of data above. */ return ret; @@ -1070,7 +1129,8 @@ int lttng_disable_event_ext(struct lttng_handle *handle, goto error; } - /* Empty filter string will always be rejected by the parser + /* + * Empty filter string will always be rejected by the parser * anyway, so treat this corner-case early to eliminate * lttng_fmemopen error for 0-byte allocation. */ @@ -1091,10 +1151,6 @@ int lttng_disable_event_ext(struct lttng_handle *handle, } lsm.cmd_type = LTTNG_DISABLE_EVENT; - if (ev->name[0] == '\0') { - /* Disable all events */ - lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name)); - } lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); /* FIXME: copying non-packed struct to packed struct. */ @@ -1134,13 +1190,17 @@ int lttng_disable_event_ext(struct lttng_handle *handle, agent_filter = set_agent_filter(filter_expression, ev); if (!agent_filter) { if (!filter_expression) { - /* No JUL and no filter, just skip everything below. */ + /* + * No JUL and no filter, just skip + * everything below. + */ goto ask_sessiond; } } else { /* - * With a JUL filter, the original filter has been added to it - * thus replace the filter expression. + * With a JUL filter, the original filter has + * been added to it thus replace the filter + * expression. */ filter_expression = agent_filter; free_filter_expression = 1; @@ -1160,13 +1220,13 @@ int lttng_disable_event_ext(struct lttng_handle *handle, goto mem_error; } - /* Add filter expression */ + /* Add filter expression. */ if (lsm.u.disable.expression_len != 0) { memcpy(varlen_data, filter_expression, lsm.u.disable.expression_len); } - /* Add filter bytecode next */ + /* Add filter bytecode next. */ if (ctx && lsm.u.disable.bytecode_len != 0) { memcpy(varlen_data + lsm.u.disable.expression_len, @@ -1187,15 +1247,16 @@ mem_error: filter_error: if (free_filter_expression) { /* - * The filter expression has been replaced and must be freed as it is - * not the original filter expression received as a parameter. + * The filter expression has been replaced and must be freed as + * it is not the original filter expression received as a + * parameter. */ free(filter_expression); } error: /* - * Return directly to the caller and don't ask the sessiond since something - * went wrong in the parsing of data above. + * Return directly to the caller and don't ask the sessiond since + * something went wrong in the parsing of data above. */ return ret; @@ -1205,10 +1266,10 @@ ask_sessiond: } /* - * Disable event(s) of a channel and domain. - * If no event name is specified, all events are disabled. - * If no channel name is specified, the default 'channel0' is used. - * Returns size of returned session payload data or a negative error code. + * Disable event(s) of a channel and domain. + * If no event name is specified, all events are disabled. + * If no channel name is specified, the default 'channel0' is used. + * Returns size of returned session payload data or a negative error code. */ int lttng_disable_event(struct lttng_handle *handle, const char *name, const char *channel_name) @@ -1223,17 +1284,15 @@ int lttng_disable_event(struct lttng_handle *handle, const char *name, } /* - * Enable channel per domain - * Returns size of returned session payload data or a negative error code. + * Enable channel per domain + * Returns size of returned session payload data or a negative error code. */ int lttng_enable_channel(struct lttng_handle *handle, struct lttng_channel *chan) { struct lttcomm_session_msg lsm; - /* - * NULL arguments are forbidden. No default values. - */ + /* NULL arguments are forbidden. No default values. */ if (handle == NULL || chan == NULL) { return -LTTNG_ERR_INVALID; } @@ -1253,14 +1312,14 @@ int lttng_enable_channel(struct lttng_handle *handle, } /* - * All tracing will be stopped for registered events of the channel. - * Returns size of returned session payload data or a negative error code. + * All tracing will be stopped for registered events of the channel. + * Returns size of returned session payload data or a negative error code. */ int lttng_disable_channel(struct lttng_handle *handle, const char *name) { struct lttcomm_session_msg lsm; - /* Safety check. Both are mandatory */ + /* Safety check. Both are mandatory. */ if (handle == NULL || name == NULL) { return -LTTNG_ERR_INVALID; } @@ -1281,16 +1340,14 @@ int lttng_disable_channel(struct lttng_handle *handle, const char *name) } /* - * Add PID to session tracker. - * Return 0 on success else a negative LTTng error code. + * Add PID to session tracker. + * Return 0 on success else a negative LTTng error code. */ int lttng_track_pid(struct lttng_handle *handle, int pid) { struct lttcomm_session_msg lsm; - /* - * NULL arguments are forbidden. No default values. - */ + /* NULL arguments are forbidden. No default values. */ if (handle == NULL) { return -LTTNG_ERR_INVALID; } @@ -1309,16 +1366,14 @@ int lttng_track_pid(struct lttng_handle *handle, int pid) } /* - * Remove PID from session tracker. - * Return 0 on success else a negative LTTng error code. + * Remove PID from session tracker. + * Return 0 on success else a negative LTTng error code. */ int lttng_untrack_pid(struct lttng_handle *handle, int pid) { struct lttcomm_session_msg lsm; - /* - * NULL arguments are forbidden. No default values. - */ + /* NULL arguments are forbidden. No default values. */ if (handle == NULL) { return -LTTNG_ERR_INVALID; } @@ -1337,10 +1392,10 @@ int lttng_untrack_pid(struct lttng_handle *handle, int pid) } /* - * Lists all available tracepoints of domain. - * Sets the contents of the events array. - * Returns the number of lttng_event entries in events; - * on error, returns a negative value. + * Lists all available tracepoints of domain. + * Sets the contents of the events array. + * Returns the number of lttng_event entries in events; + * on error, returns a negative value. */ int lttng_list_tracepoints(struct lttng_handle *handle, struct lttng_event **events) @@ -1365,10 +1420,10 @@ int lttng_list_tracepoints(struct lttng_handle *handle, } /* - * Lists all available tracepoint fields of domain. - * Sets the contents of the event field array. - * Returns the number of lttng_event_field entries in events; - * on error, returns a negative value. + * Lists all available tracepoint fields of domain. + * Sets the contents of the event field array. + * Returns the number of lttng_event_field entries in events; + * on error, returns a negative value. */ int lttng_list_tracepoint_fields(struct lttng_handle *handle, struct lttng_event_field **fields) @@ -1393,11 +1448,11 @@ int lttng_list_tracepoint_fields(struct lttng_handle *handle, } /* - * Lists all available kernel system calls. Allocates and sets the contents of - * the events array. + * Lists all available kernel system calls. Allocates and sets the contents of + * the events array. * - * Returns the number of lttng_event entries in events; on error, returns a - * negative value. + * Returns the number of lttng_event entries in events; on error, returns a + * negative value. */ int lttng_list_syscalls(struct lttng_event **events) { @@ -1422,8 +1477,8 @@ int lttng_list_syscalls(struct lttng_event **events) } /* - * Returns a human readable string describing - * the error code (a negative value). + * Returns a human readable string describing + * the error code (a negative value). */ const char *lttng_strerror(int code) { @@ -1467,8 +1522,8 @@ int lttng_create_session(const char *name, const char *url) } /* - * Destroy session using name. - * Returns size of returned session payload data or a negative error code. + * Destroy session using name. + * Returns size of returned session payload data or a negative error code. */ int lttng_destroy_session(const char *session_name) { @@ -1488,10 +1543,10 @@ int lttng_destroy_session(const char *session_name) } /* - * Ask the session daemon for all available sessions. - * Sets the contents of the sessions array. - * Returns the number of lttng_session entries in sessions; - * on error, returns a negative value. + * Ask the session daemon for all available sessions. + * Sets the contents of the sessions array. + * Returns the number of lttng_session entries in sessions; + * on error, returns a negative value. */ int lttng_list_sessions(struct lttng_session **sessions) { @@ -1529,10 +1584,10 @@ int lttng_set_session_shm_path(const char *session_name, } /* - * Ask the session daemon for all available domains of a session. - * Sets the contents of the domains array. - * Returns the number of lttng_domain entries in domains; - * on error, returns a negative value. + * Ask the session daemon for all available domains of a session. + * Sets the contents of the domains array. + * Returns the number of lttng_domain entries in domains; + * on error, returns a negative value. */ int lttng_list_domains(const char *session_name, struct lttng_domain **domains) @@ -1559,10 +1614,10 @@ int lttng_list_domains(const char *session_name, } /* - * Ask the session daemon for all available channels of a session. - * Sets the contents of the channels array. - * Returns the number of lttng_channel entries in channels; - * on error, returns a negative value. + * Ask the session daemon for all available channels of a session. + * Sets the contents of the channels array. + * Returns the number of lttng_channel entries in channels; + * on error, returns a negative value. */ int lttng_list_channels(struct lttng_handle *handle, struct lttng_channel **channels) @@ -1590,10 +1645,10 @@ int lttng_list_channels(struct lttng_handle *handle, } /* - * Ask the session daemon for all available events of a session channel. - * Sets the contents of the events array. - * Returns the number of lttng_event entries in events; - * on error, returns a negative value. + * Ask the session daemon for all available events of a session channel. + * Sets the contents of the events array. + * Returns the number of lttng_event entries in events; + * on error, returns a negative value. */ int lttng_list_events(struct lttng_handle *handle, const char *channel_name, struct lttng_event **events) @@ -1684,7 +1739,8 @@ void lttng_channel_set_default_attr(struct lttng_domain *domain, switch (domain->type) { case LTTNG_DOMAIN_KERNEL: - attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; + attr->switch_timer_interval = + DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; attr->subbuf_size = default_get_kernel_channel_subbuf_size(); attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; @@ -1696,16 +1752,20 @@ void lttng_channel_set_default_attr(struct lttng_domain *domain, attr->subbuf_size = default_get_ust_uid_channel_subbuf_size(); attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT; - attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; - attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER; + attr->switch_timer_interval = + DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; + attr->read_timer_interval = + DEFAULT_UST_UID_CHANNEL_READ_TIMER; break; case LTTNG_BUFFER_PER_PID: default: attr->subbuf_size = default_get_ust_pid_channel_subbuf_size(); attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT; - attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; - attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER; + attr->switch_timer_interval = + DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; + attr->read_timer_interval = + DEFAULT_UST_PID_CHANNEL_READ_TIMER; break; } default: @@ -1726,25 +1786,25 @@ int lttng_session_daemon_alive(void) ret = set_session_daemon_path(); if (ret < 0) { - /* Error */ + /* Error. */ return ret; } if (*sessiond_sock_path == '\0') { /* - * No socket path set. Weird error which means the constructor was not - * called. + * No socket path set. Weird error which means the constructor + * was not called. */ assert(0); } ret = try_connect_sessiond(sessiond_sock_path); if (ret < 0) { - /* Not alive */ + /* Not alive. */ return 0; } - /* Is alive */ + /* Is alive. */ return 1; } @@ -1838,7 +1898,7 @@ int _lttng_create_session_ext(const char *name, const char *url, lsm.cmd_type = LTTNG_CREATE_SESSION; lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); - /* There should never be a data URL */ + /* There should never be a data URL. */ size = uri_parse_str_urls(url, NULL, &uris); if (size < 0) { ret = -LTTNG_ERR_INVALID; @@ -2038,7 +2098,7 @@ int lttng_list_tracker_pids(struct lttng_handle *handle, } /* - * lib constructor + * lib constructor. */ static void __attribute__((constructor)) init() { @@ -2047,7 +2107,7 @@ static void __attribute__((constructor)) init() } /* - * lib destructor + * lib destructor. */ static void __attribute__((destructor)) lttng_ctl_exit() {